China Scsdn Environment Technology Co., Ltd. Company News

SDN Metallic Membrane Filter Elements Metallic Membrane Materials 1. The membrane material is prepared by the Kirkendall effect induced by elemental partial‑diffusion. 2. It addresses global technical bottlenecks of material selection for high‑temperature gas filtration. 3. Adopting atomic‑scale partial‑diffusion reaction synthesis technology, it enables precise regulation of pore structures at micron and sub‑micron levels. The material delivers excellent filtration performance including uniform pore‑size distribution, high filtration accuracy, high open porosity, low tortuosity factor and low filtration resistance. 4. Its unique mixed‑bond crystal form combining metallic bonds and covalent bonds integrates merits of both metals and ceramics. It features outstanding chemical stability, thermal stability, mechanical‑physical properties, machinability, thermal conductivity and electrical conductivity. 5. The material is manufactured via eco‑friendly processes. It is environmentally benign throughout its full life cycle, recyclable and cost‑effective. Material Characteristics 1. Presented in thin sheets with thickness of 0.5‑0.8 mm, flexible and roll‑formable. 2. High open porosity, uniform pore size and smooth pore channels. 3. Excellent machinability. 4. Asymmetric pore structure.  Features of Flexible Metallic Membranes Metallic membranes can be made into flexible, semi‑rigid and rigid types. Flexible membranes are the most widely‑used variant with the following properties: - High‑temperature resistance: up to 400 °C (no bag burnout risk) - Corrosion resistance: resistant to H₂S, SO₂, SO₃ and other corrosive media - High filtration accuracy: 0.1 μm; membrane pore size 10 μm; outlet dust concentration can reach ＜5 mg/Nm³ - High flux: above 1.5 times the flux of conventional filter bags per unit area - Low resistance: about 300 Pa lower pressure drop than filter bags for the same gas volume, bringing around 10 % power‑saving - Smooth surface: facilitates pulse‑jet ash cleaning (filter bags tend to accumulate dust) - Long service life: durable under normal operation; service life is 1‑2 years longer than premium filter bags SDN Silicon Carbide (SiC) Membrane Technology  Properties of Silicon Carbide Ceramic Membrane Materials - Structure: Silicon carbide, also known as carborundum or moissanite, has two basic grades: black SiC and green SiC. Its crystal forms include hexagonal/rhombohedral α‑SiC and cubic β‑SiC. - Performance: Chemically stable, barely etched by any solvent below 1500 °C. It boasts high thermal conductivity, low thermal expansion coefficient, strong hydrophilicity and superior wear resistance. With a Mohs hardness of 9.5, it is second only to diamond (Mohs 10). Multi‑Channel Tubular Silicon Carbide Ceramic Membrane The support layer, transition layer and separation layer are all fabricated from high‑purity silicon carbide (>99.5 %) without any sintering additives, thus inheriting nearly all intrinsic properties of SiC.  Membrane Structure The support layer, transition layer and separation layer are sintered layer‑by‑layer under matched firing regimes. Neck‑joints are formed between SiC particles of each layer to guarantee membrane strength, pore‑size precision and high porosity.  Technical Advantages of SiC Membranes SDN holds domestically leading complete technologies for high‑performance SiC ceramic membranes, including slurry preparation & coating, grain morphology control, local sintering and pore‑size tuning. The reaction‑recrystallization composite sintering process for SiC ceramic membranes yields stable and consistent microfiltration / ultrafiltration membrane products.  Separation Advantages of SiC Ceramic Membranes 1. Stable separation & retention performance: narrow and stable pore‑size distribution. Membrane structure and pore dimension remain intact under high pressure or pulse pressure. 2. High separation efficiency and large flux: produced by high‑temperature recrystallization sintering with smooth rounded particle edges. Membrane pores and channels are well interconnected with no closed pores, bringing low flow resistance and higher flux compared with other inorganic membranes. 3. Physical demulsification for efficient oil‑water separation: hydrophilic‑oleophobic surface delivers favorable oil‑water separation capacity. 4. Physical separation with strong anti‑fouling performance for reliable separation quality. Membrane and auxiliary materials are non‑polluting; no chemical additives are introduced during filtration to avoid secondary contamination. 5. Fouled membranes can be thoroughly cleaned to restore original flux. 6. Compact equipment footprint, low energy consumption and low operating cost. It supports automatic control and unattended operation.  SDN S31603 Stainless Steel Fiber Felt  S31603 Fiber Felt Features 1. High‑temperature resistance: outstanding heat‑resistance, corrosion‑resistance and filtration performance. 2. Corrosion resistance: unique 3D porous architecture built by multi‑layers with graded pore sizes. It provides high porosity, large specific surface area, uniform pore‑size distribution, high dust‑holding capacity and high filtration precision. 3. High accuracy: effectively overcomes easy‑clogging and easy‑damage drawbacks of metal mesh, as well as brittleness and low flow rate limitations of powder‑based filter products. It delivers superior temperature‑resistance and pressure‑resistance compared with ordinary filter paper and filter cloth.  S31603 Fiber Filter Bags Cylindrical filter elements manufactured by high‑precision welding with stainless‑steel fiber felt as raw material. Performance 1. High temperature resistance, corrosion resistance and high mechanical strength. 2. Good air permeability, low initial pressure drop and high separation efficiency; outlet emission can be lower than 5 mg/m³. 3. Available for on‑line back‑blowing and off‑line cleaning, favorable regeneration performance and long service life. 4. Easy‑to‑recycle, preventing secondary environmental pollution. Specifications - Outer Diameter D: 10 mm ~ 160 mm - Length L: 50 mm ~ 6000 mm - Filtration accuracy: ≥ 0.5 μm Application: High‑temperature flue‑gas dedusting for steel, chemical, power, new‑energy and other industries. SDN Non‑metallic Ceramic Fiber Filter Tubes  Material Characteristics 1. Porosity: 65‑85 %; low density: 0.4 g/cm³; anti‑seismic performance, resistant to fracture caused by thermal expansion & contraction. 2. Filtration efficiency originates from ultra‑fine ceramic fibers (d=2‑3 μm). 3. Ceramic fibers are chemically inert against most reagents. 4. High‑temperature resistance. 5. Rigid mechanical property. 6. Self‑supporting monolithic cylindrical structure with no frame required. Main constituents: aluminosilicate fibers and inorganic binders.  Five Core Advantages of Ceramic Fiber Filter Tubes 1. Replacement for conventional filter bags: identical installation and high‑pressure pulse‑jet cleaning mode as traditional baghouse filters. 2. Superior high‑temperature and corrosion resistance compared with conventional filter bags. 3. Longer service life than traditional filter bags. 4. Integrated ultra‑low‑emission solution: integrated dedusting‑denitrification system with simple operation and low cost, fully complying with national environmental‑protection emission standards. 5. Waste‑heat recovery capability: dedusting and denitrification are completed at high temperature. Clean hot flue gas can be further utilized for sensible‑heat and latent‑heat recovery. Catalyst‑Loaded Ceramic Fiber Filter Tubes Target pollutants: flue‑gas dust, desulfurization‑generated dust and nitrogen oxides (NOₓ). 1. Apart from dust filtration, reactive additives can be incorporated: alkaline agents for removing acid gases (SO₂, HCl, HF); ammonia / urea for NOₓ abatement. 2. Catalyst‑loaded ceramic fiber filter tubes integrate catalysts inside the filter substrate to accelerate catalytic NOₓ removal reactions. 3. Common catalysts and their optimal operating temperature ranges: - M‑01 V‑Ti‑W based catalyst: optimal 270‑400 °C, max. 420 °C - M‑02 V‑Ti based catalyst: optimal 250‑330 °C, max. 350 °C - L‑01 Mn‑Fe based catalyst: optimal 150‑225 °C, max. 250 °C

    SDN filtration and concentration equipment targets industry-specific filtration pain points. Supported by two high-performance core filter elements, titanium-based metallic membranes and silicon carbide membranes, combined with precision filtration processes and intelligent control systems, the equipment efficiently performs various filtration and concentration, impurity removal & purification, and material recovery tasks. It fully meets the production demands for refined, continuous and eco-friendly industrial manufacturing.     Filter Element – Titanium-based Metallic Membrane  Manufacturing Process Made from high-purity industrial metal powder via high-pressure compaction and high-temperature sintering. Joints are welded under inert gas protection without any binders.    Material Properties The membrane material is fabricated leveraging the Kirkendall effect induced by elemental interdiffusion. The reactive synthesis technology enables precise control of pore structures at micron/submicron scales. The material features uniform pore size distribution, high filtration accuracy, high open porosity, small tortuosity factor and low filtration resistance. Its unique crystal structure with mixed metallic and covalent bonds combines merits of both metals and ceramics, delivering outstanding chemical stability, thermal stability, mechanical and physical properties, machinability, as well as thermal and electrical conductivity. The material production process is environmentally friendly. The material is eco-friendly throughout its full lifecycle, recyclable and cost-effective. Filtration rating: 0.1 μm    Filter Element – Silicon Carbide Membrane Manufacturing Process Fabricated with high-purity silicon carbide (>99.5%) as raw material through high-pressure compaction and recrystallization sintering at 2400 °C without any sintering additives. It scores 9.5 on the Mohs hardness scale, second only to diamond (Mohs 10).    Material Properties Superior chemical stability: barely reactive with any solvent below 1500 °C. It features extreme oxidation resistance (any concentration), chlorine resistance (any concentration) and fluoride resistance (any concentration), with outstanding tolerance to acid/alkali of any concentration and high temperature resistance up to 800 °C. Extremely high hydrophilicity with a water contact angle close to 0°, resulting in very low filtration pressure drop. High mechanical strength with pressure resistance >10 bar and zero risk of filament breakage. High thermal conductivity and low thermal expansion coefficient. Excellent performance recovery after chemical cleaning. Under heavily contaminated conditions, it can be continuously cleaned with high-concentration chemical agents while permeability can still be restored. Service life: over 20 years. Filtration rating: 0.03 μm   Application Scope of SDN Filtration & Concentration Equipment  Primary Applications - Filtration and concentration of ternary precursors - Filtration and concentration of cobalt carbonate and cobalt hydroxyoxide - Filtration and concentration of sodium-ion battery precursors - Washing and filtration of lithium iron phosphate - Filtration for hydrometallurgy - Filtration and concentration of spherical nickel hydroxide - Filtration and concentration of cobalt hydroxide - Filtration and concentration of other slurries   Leveraging the advantages of titanium-based metallic membranes and silicon carbide membranes, SDN filtration equipment addresses many drawbacks of conventional filtration equipment and adapts to diverse harsh and complex working conditions. With a comprehensive portfolio of complete machines, the equipment is widely applied in lithium battery, hydrometallurgy, metal salt refining and other industries.   Adopting purely physical separation technology without altering material properties, the equipment boasts high filtration accuracy, low pressure drop, easy cleaning, long service life and fully automatic continuous operation.   It provides efficient and stable integrated filtration solutions for industrial production, helping enterprises improve quality & efficiency, save energy & cut costs, and achieve stable and eco-friendly production.

Against the global backdrop of dual carbon goals and tightening industrial environmental regulations, wastewater treatment is no longer a passive compliance task for the new energy sector — it has become a core link that connects production stability, resource recovery and long-term sustainable operations.For lithium battery material manufacturers, building an efficient water treatment system is not only a requirement for meeting discharge standards, but also a key step to unlock the value of industrial water reuse. Unlike general municipal wastewater, the effluent generated in lithium battery material production contains complex components including heavy metal traces, high-concentration salt and organic additives. If not properly treated, it will not only pose a potential threat to the surrounding water environment, but also lead to unnecessary water resource waste under the background of increasing water scarcity. Modern water treatment solutions no longer rely on a single process, but build a full-cycle system through graded filtration, membrane separation technology and resource recovery units: this design can not only stably make the effluent meet strict discharge standards, but also convert part of the treated water into process water that can be reused in production, helping enterprises reduce their dependence on new water intake. Many factory operators still have misunderstandings about water treatment systems, thinking that "stable discharge" is the end point. In fact, a well-designed system can bring additional operational value in daily operation. For example, reasonable sludge treatment and resource recovery links can recover useful components from wastewater and turn them into recyclable resources; the optimized system layout can also reduce the energy consumption of operation and make the water treatment link itself move in a more energy-saving direction, which is highly consistent with the emission reduction goals pursued by the lithium battery industry. For today's industrial production, environmental protection and production efficiency are no longer opposing options. When the water treatment system is deeply integrated into the factory operation, it can not only help enterprises easily cope with the increasingly strict environmental assessment requirements, but also create a more sustainable production model through water recycling. This is not only a necessary measure for enterprises to fulfill their environmental responsibilities, but also a core support for the new energy industry to move towards a greener and more circular future.

Silica in water predominantly exists in the form of inorganic silicic acid compounds, and the industry uniformly measures it as silicon dioxide (SiO₂). According to GB/T 12149-2017, Determination of Silicon in Industrial Recirculating Cooling Water and Boiler Water, silica in water exists in four forms: 1. Dissolved Silica (Reactive Silica) Composed mainly of monomeric orthosilicic acid (H₄SiO₄) and metasilicic acid (H₂SiO₃); detectable via the molybdate colorimetric method. Particle size < 1 nm, so it cannot be removed by ordinary filtration; under conditions of pH > 10.5, a small fraction dissociates into silicate ions. 2. Colloidal Silica (Non-Reactive Silica) Formed when silicic acid molecules polymerize into polysilicic acid colloids, with a particle size of 1 nm to 1 μm. Conventional coagulation removes only about 60%, and it can easily pass through ultrafiltration and reverse osmosis membranes. 3. Adsorbed Silica Silica adsorbed onto the surface of sediment, iron hydroxide, or calcium carbonate flocs; most of it can be removed through conventional sedimentation and filtration. 4. Particulate Silica Solid particles such as sand, gravel, and silicate minerals, which can be fully intercepted by bar screens and quartz sand filtration. For zero-liquid-discharge (ZLD) and MVR evaporation systems, dissolved silica and colloidal silica are the most hazardous. As they pass through the membrane system, they are continuously concentrated and their concentrations multiply, making them the core cause of silica scale formation. Core reasons why water treatment must remove silica, and the hazards of silica: 1. Damage to Reverse Osmosis / Nanofiltration Membrane Systems Colloidal silica forms a dense gel layer on the membrane surface, while dissolved silica precipitates as silica scale after continuous concentration. Per HJ 579-2010, Technical Specification for Membrane Separation Wastewater Treatment, the RO feed-water SDI should be ≤ 5. Excessive silica directly keeps the SDI elevated, manifesting as a month-by-month rise in transmembrane pressure, a production capacity decline of over 30%, and premature membrane element failure within 1-2 years. Silica scale cannot be dissolved by conventional acid or alkali cleaning; only hydrofluoric acid can remove it, significantly increasing chemical consumption and on-site safety risks. 2. Fatal Impact on MVR Evaporation-Crystallization Systems Industry standards clearly specify that the silica dioxide in MVR evaporator feed water should not exceed 50 mg/L, while salt-resource-recovery projects must control it within 10 mg/L. Under high-temperature concentration, silicic acid polymerizes to form dense, hard magnesium silicate and calcium silicate scale that firmly adheres to heat-exchanger tube walls. With a thermal conductivity only 1/100 of that of stainless steel, silica scale directly raises evaporation energy consumption by 40%. Being extremely hard, it is difficult to remove by ordinary acid washing and requires shutdown for high-pressure water flushing; each such maintenance stop can take 3-7 days. Once pipelines are blocked by silica scale, system treatment capacity drops sharply, and there is also an environmental risk of non-compliant effluent discharge. 3. Secondary Cascading Economic Losses Silica entering the crystallized salt product turns the salt black and fails quality standards, making it unsellable as industrial salt and forcing disposal as hazardous waste — at up to 10 times the cost. Meanwhile, frequent start-stop cycles and repeated chemical cleaning generate large volumes of hazardous sludge, and combined with chemical consumables, labor hours, and production downtime, overall operation and maintenance costs multiply. Silica scale has three major characteristics — difficulty of cleaning, irreversible damage, and heavy equipment wear — and is a key hidden threat to the stable operation of membrane concentration and evaporation-crystallization systems. All industry design codes make it clear that desilication cannot be remedied or repaired by downstream equipment; it must be a core part of pretreatment, with strict control over key process parameters such as pH, chemical dosage, and reaction retention time. Based on the actual water quality of the project and the resource-recovery objectives, the appropriate processes — such as magnesium-salt precipitation, tubular membrane, and resin polishing for silica removal — should be selected to control feed-water silica dioxide within the standard limits. Only in this way can the comprehensive costs arising from equipment failures, shutdown maintenance, and hazardous-waste disposal be effectively reduced, ensuring long-term stable and compliant operation of the entire water treatment system.

The new energy lithium battery sector is undergoing rapid technological iteration. As the core substrate for power batteries, ternary cathode material generates washing wastewater during production. Treatment of this wastewater constitutes a critical link for manufacturers to achieve compliant operation, cost reduction, efficiency improvement and low-carbon green development. Ternary cathode washing wastewater is characterized by high salinity, heavy metal content, complex organic compositions and fluctuating water quality. Conventional treatment processes can merely meet basic discharge standards, accompanied by a host of industry pain points including water resource waste, large solid waste output, high operation & maintenance costs and loss of valuable resources. Such approaches fail to satisfy the industry’s current demands for water conservation, emission reduction and resource recycling. To address the complex working conditions of wastewater generated from ternary cathode washing, SDN Environmental has developed an integrated technical solution featuring full-quantification treatment, zero liquid discharge and resource recovery for ternary cathode production lines, drawing on years of experience in lithium battery wastewater governance. Adopting a closed-loop process consisting of staged purification, membrane concentration and crystallization for resource recovery, the solution fundamentally tackles challenges in lithium battery washing wastewater treatment. It helps lithium battery manufacturers accomplish multiple goals including near-zero discharge of wastewater, recycled water reuse and solid waste volume reduction & quality improvement. Key Challenges of Ternary Cathode Washing Wastewater Wastewater produced in the cleaning process of ternary cathode materials features complex working conditions and poses great treatment difficulties, representing a major bottleneck in lithium battery environmental governance: Complex water composition: The wastewater contains heavy metal ions such as nickel, cobalt and manganese. Conventional processes struggle to achieve thorough purification, creating risks of excessive pollutant discharge. Traditional treatment modes mostly adopt "pretreatment + basic biochemical treatment", which only enable compliant effluent discharge. Large volumes of process water are consumed in a single pass, resulting in low water resource utilization and persistently high water costs for enterprises. High-salinity wastewater is difficult to dispose of externally at substantial expense, generating large quantities of solid waste and driving up both environmental operation pressure and overall production costs. Unstable water volume and quality caused by fluctuating production conditions. Ordinary wastewater treatment systems feature weak shock resistance and poor operational stability. Core Technology: Staged Closed-Loop Treatment to Achieve Zero Discharge & Resource Recovery Rejecting extensive conventional wastewater treatment modes, SDN Environmental innovatively applies a full closed-loop process: pretreatment for pollutant decomposition, advanced purification, membrane separation and concentration, plus MVR evaporative crystallization. Through staged treatment and cascaded water reuse, the solution delivers full-volume wastewater recycling, zero liquid discharge and maximum recovery of valuable resources. Targeted Pretreatment to Break Barriers in Wastewater Treatment Aimed at heavy metal complexes, suspended solids and other contaminants in wastewater, processes including chemical complex breaking, coagulation sedimentation and precision filtration are deployed to remove suspended impurities and heavy metals. The technology deconstructs refractory pollutants, stabilizes wastewater quality, lowers the load for downstream advanced treatment, prevents membrane fouling and abrasion, and ensures long-term stable operation of the overall system. Advanced Membrane Purification for Recyclable Standard-Quality Water A multi-stage membrane separation system combining ultrafiltration and reverse osmosis conducts advanced purification on pretreated water, effectively intercepting dissolved salts, trace organics and residual contaminants. The purified water maintains stable high purity and can be directly reused in core processes including ternary cathode cleaning and production batching. Closed circulation of process water drastically cuts the consumption of fresh water. Concentration & Crystallization of High-Salinity Water for Solid Waste Reduction and Zero Discharge For concentrated brine produced by the membrane system, high-efficiency membrane concentration elevates brine concentration, followed by solidification via the MVR evaporative crystallization system. Salts are separated out as crystalline solids to thoroughly separate wastewater and solids. The complete process generates no wastewater discharge, truly realizing zero liquid discharge of process wastewater. Meanwhile, valuable substances can be recovered to maximize the resource value of wastewater.

In the production of new energy materials such as iron phosphate and lithium iron phosphate (LFP), flue gas treatment in the two core processes of drying and calcination has long been a major environmental challenge. Unlike ordinary industrial exhaust gases, kiln tail gases in lithium battery production are characterized by four critical features: high corrosivity, high temperature, high viscosity, and high-value dust. These include P₂O₅ crystallization causing pipeline blockages, HF strong acid corrosion, ultra-fine powders easily clogging filter bags, and filter media damage under high-temperature conditions. Traditional glass fiber filter bags and PTFE-coated filter bags frequently suffer from issues such as breakage, dust leakage, surging resistance, frequent replacements, and low recovery rates of valuable powders. These problems not only result in high O&M costs but also easily lead to particulate matter exceeding standards and failure in environmental compliance acceptance. Currently, leading mass-production lines in the lithium battery industry have comprehensively upgraded their core dust removal components to industrial sintered metal filter bags. Targeting the specific working conditions of iron phosphate drying and LFP calcination, metal filter bags can be customized with appropriate materials based on actual parameters such as flue gas temperature, corrosion concentration, and dust characteristics. They have become an essential core equipment in the pretreatment of lithium battery tail gases, thoroughly resolving the shortcomings of traditional filter media. Pain Points in Flue Gas Treatment for Two Major Lithium Battery Processes: 1. Pain Points in Iron Phosphate Drying Tail Gas In the spray drying and flash drying processes of iron phosphate, the flue gas temperature ranges from 100–280°C, with high humidity and moisture content. The gas carries ultra-fine, sticky iron phosphate powder along with trace amounts of ammonia mist and phosphoric acid mist. The drawbacks of traditional filter bags are prominent: moist dust causes bag clogging, cleaning is difficult, operating resistance is high, and frequent shutdowns for bag replacement lead to significant losses in the recovery of valuable powders. 2. Pain Points in LFP Calcination Tail Gas The high-temperature sintering processes in rotary kilns and pusher plate kilns present even harsher conditions: temperatures of 250–600°C, containing corrosive components such as HF, phosphorus oxides, CO, and VOCs. The most fatal issue is that gaseous P₂O₅ easily crystallizes and blocks pipelines upon temperature fluctuations. Fluorides strongly corrode ordinary filter media. Traditional filter bags lack sufficient high-temperature and anti-corrosion resistance, making them highly susceptible to burning, breakage, and dust leakage, which directly affects the stable operation of downstream incineration and washing systems. Technical Advantages of Metal Filter Media in Flue Gas Treatment: Sintered metal filter media are perfectly suited for the high-temperature, highly corrosive, and high-precision dust removal conditions in lithium battery production. They can be flexibly selected based on on-site flue gas temperature, corrosive medium concentration, and dust characteristics. Compared to traditional filter media, they offer significant comprehensive application advantages, effectively solving various pain points in lithium battery tail gas treatment. Advantage 1: Ultra-Wide Temperature Resistance, Unfazed by High-Temperature Calcination Impacts Under working conditions, metal filter bags can continuously withstand temperatures up to 450°C, with instantaneous resistance exceeding 500°C, fully covering the 250–400°C regular operating range of calcination kiln tail gases. For ultra-high-temperature special conditions, upgraded high-grade metal materials can be selected to further increase the temperature limit. This completely eliminates the high-temperature aging, burning, and deformation issues of traditional PTFE and glass fiber filter bags. There is no need to worry about filter bag failure due to kiln temperature fluctuations, ensuring 24-hour continuous and stable system operation, perfectly matching the needs of continuous mass production. Advantage 2: Fluorine and Phosphorus Corrosion Resistance, Tailored for Special Lithium Battery Flue Gases HF and phosphorus compounds in LFP calcination tail gases are the "nemesis" of ordinary organic filter media, causing embrittlement and a drastic drop in air permeability during long-term operation. Customized metal filter media in

A 60 tonnes per day (6 t/h evaporation capacity) two-effect countercurrent zinc sulfate evaporation and crystallization system project is set to upgrade the client’s zinc sulfate manufacturing process in Malaysia, phasing out the original batch-type single-kettle evaporation and crystallization process. Sichuan Shuotai Saipu Environmental Protection Technology Co., Ltd., a subsidiary of SDN Group (Sidaneng), undertakes core process design and key equipment integration for the whole facility.   The continuous automatic system targets multiple key objectives:   First, realize continuous production and higher capacity. Transforming intermittent operation into stable automated continuous manufacturing, the plant will deliver 2.5 tonnes per hour of high-quality monohydrate zinc sulfate ((ZnSO_4·H_2O)). Second, cut energy and operational expenditure. The two-effect countercurrent process greatly reduces steam consumption. Automated operation further lowers labour requirements. Third, improve finished product quality. Adopting advanced high-temperature evaporation and crystallization technology for zinc sulfate, the system enables precise crystallization control to produce premium-grade monohydrate zinc sulfate with uniform particle size and high purity. Fourth, achieve internal resource recycling. Condensed water generated from evaporation will be fully recycled for upstream washing procedures, facilitating water circulation inside the production line and satisfying clean production and environmental standards. Key Project Parameters Project Name: 60t/d Two-Effect Zinc Sulfate Evaporation & Crystallization System Location: Malaysia Contractor: Sichuan Shuotai Saipu Environmental Protection Technology Co., Ltd. (Subsidiary of SDN Group) Feed Processing Capacity: 60 tons/day (evaporation rate: 6 t/h) Production Output: 2.5 tons/hour Monohydrate Zinc Sulfate ((ZnSO_4·H_2O))

In the global pursuit of sustainable development, the fusion of cutting-edge environmental technology and large-scale ecological projects stands as a cornerstone for building a greener tomorrow. Recently, our company welcomed a high-ranking delegation from the Saemangeum Development Administration (SDA), led by Senior Officer Kim Yun-cheol and Chief Administrator Hwang Won-jin. This pivotal meeting served as a dynamic platform for exchanging expertise, aligning sustainability visions, and exploring potential partnerships to elevate environmental standards for South Korea’s transformative Saemangeum development initiative. As a frontrunner in environmental equipment innovation, we have long dedicated ourselves to crafting solutions that balance industrial advancement with ecological protection. During the discussions, we highlighted our core technological competencies tailored to Saemangeum’s unique challenges, focusing on three critical areas: advanced water treatment systems, state-of-the-art flue gas purification equipment, and high-efficiency thickening technology. Our water treatment solutions, incorporating advanced membrane bioreactors (MBRs) and zero-liquid discharge (ZLD) systems, directly addressed Saemangeum’s needs—from its 118-square-kilometer freshwater lake to industrial water supply for emerging sectors. With the SDA ramping up water pipeline construction for secondary battery enterprises and prioritizing integrated water surface management, our equipment’s capability to process high-volume, complex wastewater while enabling resource recycling struck a chord. Meanwhile, our flue gas treatment systems, equipped with low-nitrogen combustion and selective catalytic reduction (SCR) technology, align seamlessly with Saemangeum’s goal of developing a 6GW renewable energy complex and achieving carbon-neutral industrial operations. Additionally, our high-efficiency thickeners—designed for sludge dewatering and mineral concentration—emerged as vital tools for the project’s land reclamation and agro-bio area development. The SDA delegation provided a comprehensive briefing on the Saemangeum project, South Korea’s largest reclamation undertaking spanning 409 square kilometers—equivalent to two-thirds of Seoul’s area. Senior Officer Kim Yun-cheol outlined key 2025 priorities: expediting the completion of 1 million pyeong (≈3.3 million ㎡) of industrial land in the Second Industrial Park and accelerating infrastructure development, such as the Feiying 2 and 3 substations, to support energy-intensive businesses. Chief Administrator Hwang Won-jin underscored the project’s dual mission of driving economic growth while upholding environmental stewardship, noting the pressing need for reliable environmental equipment to accommodate incoming investments—including China’s Xiamen Tungsten Industry’s recent 15 million USD expansion plan. The dialogue was characterized by mutual enthusiasm and strategic synergy. The SDA delegation expressed keen interest in our integrated environmental solutions, recognizing their potential to support Saemangeum’s vision of a “vibrant green waterfront city” that harmonizes industry, tourism, and nature. Our team, in turn, was inspired by the project’s scale and ambition, viewing it as an exceptional showcase for the real-world impact of our technologies. “Saemangeum is more than just a development project—it’s a blueprint for 21st-century sustainable urbanization,” stated our CEO. “We are privileged to contribute our expertise to this landmark initiative, helping turn its green vision into tangible results.” Senior Officer Kim Yun-cheol echoed this sentiment: “Partnerships with innovative environmental technology providers are essential to Saemangeum’s success. We anticipate deepening our collaboration to build an eco-friendly industrial hub that sets global benchmarks.” As the meeting drew to a close, both parties agreed to establish a follow-up working group to explore specific cooperation avenues, including water treatment pilot projects in the Third and Seventh Industrial Zones. This engagement not only strengthens ties between our company and the SDA but also lays the groundwork for a transformative partnership that will shape sustainable development in Northeast Asia. In a world where environmental challenges call for collective action, this dialogue represents more than a business exchange—it’s a shared commitment to building a greener, more prosperous future. Together, we are poised to turn challenges into opportunities, technology into progress, and vision into a lasting legacy.

Outlook on Energy Development Sida Neng participates in the Sino German Clean Energy Industry Investment Cooperation and Exchange Conference   _____________________     Assist in the development of new energy and industrial upgrading     Sida Energy Environmental Protection was invited and participated in the Sino German Clean Energy Industry Investment and Cooperation Exchange Conference jointly hosted by the International Business Agency of North Wales and the Sichuan Clean Energy Industry Alliance in Chengdu on August 29, 2023.       In the field of new energy development, China and Germany, as models of international cooperation and promoters of global governance, have good cooperation experience and foundation. To further promote exchanges and cooperation between Chinese and German enterprises, the International Business Agency of North Germany and the Sichuan Clean Energy Industry Alliance jointly hosted the China Germany Clean Energy Industry Investment Cooperation Exchange Conference in Chengdu on August 29, 2023. Currently, while countries around the world are increasing their efforts in energy green and low-carbon transformation, they are also continuously expanding international mutual assistance and cooperation. Stones from other mountains can be used to attack jade. In the context of achieving carbon peak and carbon neutrality being integrated into the overall layout of China's ecological civilization construction, as a pioneer in China's environmental protection industry, Sida Energy actively participates in international exchanges and cooperation in the clean energy industry, injecting strong new forces into the clean energy and new energy industries of China and Germany. It is the social mission and responsibility of Sida Energy Environmental Protection personnel that cannot be shirked. In recent years, Sida Energy has combined its accumulated technological advantages to expand its domestic and international layout, with source innovation as the main driving force, promote industrial technology upgrading, and expand its business in overseas energy markets, gradually emerging in the international environmental protection market. Today, Sida Neng people are continuously iterating and upgrading their existing products through their own efforts, meeting and responding to the customized needs of different customers around the world, continuously promoting the development of the new energy industry chain, and continuously providing clean production and energy-saving and environmental protection solutions for customers in the new energy industry.         At the meeting, Mr. Zhao Cong, Deputy General Manager of Sida Neng Company, introduced the development and achievements of Sida Neng to Mr. Mi Anlong, Consul General of the German Consulate General in Chengdu, Ms. Lei Xuejie, Vice President of the Sichuan Council for the Promotion of International Trade, and Mr. Chen Gong, Representative of the Chengdu Representative Office of the German North Weizhou International Business Agency, which won unanimous recognition from Mr. Mi Anlong and Ms. Lei Xuejie.       After listening to the speeches of representatives from Chinese and German enterprises attending the conference, representatives from Sida Energy gained a deep understanding of the business, technology, and project development of participating companies such as Rheinland Group, RWE, Dongfang Electric, and Tongwei Group in the energy field. In the technical exchange stage, representatives of Sida Energy had sufficient exchanges and discussions with representatives of Chinese and German enterprises attending the meeting, actively seeking reliable strategic partners for Sida Energy to further promote its internationalization process and laying a solid foundation for entering the international market.       This meeting not only focused on the full exchange and discussion of energy cooperation experiences between China and Germany, but also built an efficient exchange platform for the development of Chinese enterprises in Germany, achieving good conference results.     In the future, Sida Energy will continue to pay attention to the international market, promote international exchanges, and promote industry cooperation. It will continue to focus on the new energy materials industry chain, focusing on the three major sectors of basic raw materials, intermediates, and resource regeneration. By leveraging the company's existing research and development technology and application foundation, we will collaborate with upstream and downstream industries, as well as industry university research forces, to create a highland of scientific and technological talents, cultivate leading scientific and technological talents and high-level innovation teams, continuously expand the business fields of gas purification, liquid treatment, and material separation and concentration, add support to the high-quality development of the industry, and provide users with the most suitable solutions.  

Collaborative cooperation to explore the future together SDN Environmental Protection participates in the "2023 China (Sichuan) - Finland Economic and Trade Exchange Conference"       On the morning of September 14th, Sida Neng Environmental Protection, as an invited enterprise, participated in the "2023 China (Sichuan) - Finland Economic and Trade Exchange Conference" jointly organized by the Sichuan Council for the Promotion of International Trade and the Finnish State Administration for the Promotion of Commerce. A total of 22 Finnish companies participated in this conference, and the cooperation and negotiation projects covered multiple fields such as industrial digitization, carbon reduction, energy, bioeconomy, green building, food, medical and health, and sustainable production.         Exchange, cooperation and negotiation   During the docking and negotiation process, Li Jie, Director of International Sales Department of Sida Energy Environmental Protection, Xiao Songlin, Deputy Director of Technical Support Department, Yang Wenfu, representative of ColloidTek Oy (Collo) Finland's Collo company, and Fang Changyu, representative of Metso Outotec Metso Altutai company, jointly exchanged ideas on cooperation opportunities in the fields of liquid quality analysis and control, mineral processing, and sustainable technology in the metal smelting industry.       01 SDN Environmental Protection and Finnish Collo Company for Cooperation and Negotiation   Since its establishment, SDN Environmental Protection has been deeply involved in the field of new energy wastewater treatment for many years. Currently, the research and development, scheme design, production and manufacturing engineering installation of water treatment systems have all achieved full autonomy, maintaining a leading position in the zero discharge application industry of wastewater in the field of battery materials. We have established multiple domestic and foreign first engineering projects and pioneered the application of new fields such as lithium sulfate membrane concentration and ammonium chloride condensate concentration, with a market share of 80% in segmented fields. During the conversation with Yang Wenfu, Li Jie introduced the development history, equipment application fields, and production technology of SDN, and shared the main practices of SDN in water treatment system research and development, scheme design, and production manufacturing. SDN has been committed to exploring new ways of international cooperation and looks forward to cooperating and exchanging ideas with various multinational enterprises to comprehensively enhance the level of international cooperation. Yang Wenfu praised the equipment strength and technical level of SDN. He stated that in recent years, cooperation between China and Finland in areas such as economy, trade, and science and technology has been increasingly deepening, and the future development of both sides is full of new opportunities. He looks forward to conducting technical cooperation with our institute, especially in the field of liquid detection applications such as ternary precursor wastewater and zero discharge of ternary cathode materials, to establish a detection standard database and achieve rapid liquid identification. Yang Wenfu introduced Colloid Tek's advanced technology in the sensor field and demonstrated the breakthroughs and innovations in liquid detection technology. He hopes that Colloid Tek's new technology can serve SDN related testing projects, accelerate sample testing speed, and improve equipment efficiency. Both sides have reached a consensus on further deepening communication and cooperation. The two sides said that they would deepen cooperation and exchanges, explore areas of cooperation, promote cooperation in technological innovation, product testing, standard formulation and other fields to develop in depth, actively promote international cooperation to achieve significant progress and results, and jointly promote the construction of the "the Belt and Road".   02 Communication and exchange between SDN Environmental Protection and Metso Metso   During the exchange session, Li Jie, Xiao Songlin, and Fang Changyu discussed future development plans and jointly explored ways to support the sustainable development of the new energy industry. Taking this opportunity to learn from each other, complement each other's strengths and weaknesses, deepen exchanges, and better achieve win-win results in the field of new energy. In the past few years, despite extremely complex environments, the Chinese economy has still achieved steady development. China's dual carbon strategy and high-quality development concept have brought great opportunities for both sides. Currently, both companies are highly concerned and optimistic about the new energy industry market, full of confidence in the future development of the new energy industry, and hope to jointly empower and explore development directions in the future, share new energy development opportunities, better meet the needs of the international market, and more comprehensively meet the needs of customers. SDN will continue to make positive contributions to the implementation of the dual carbon goals and China's high-quality development with stronger innovation, research and development, and manufacturing capabilities, together with customers and various partners.