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SDN Environmental Technology Group.is a professional environmental protection high-tech group enterprise in gas purification,liquid treatment,material separation and concentration.Main business includes consulting,planning and design, intelligent equipment manufacturing,engineering construction,etc.Adhering to the mission of Original Innovation as the main driving force to promote industrial technology upgrading, we committed to providing clean production,energy saving and environmental protection technology solutions and engineering application solutions with membrane and membrane separation technology.
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by the Shanghai Industrial pump permanent investment in the construction ,
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SDN adheres to the mission of source innovation as the main driving force, promoting industrial technology upgrading, and strives to build an independent research and development team.
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project consulting, planning and design, intelligent manufacturing, engineering construction, operation and maintenance services, etc., mainly serving the new energy material industry chain
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350 independent intellectual property rights, nearly 200 authorized patents, more than 10 international PCT patents, and many large central enterprises in the industry, leading listed companies, head enterprises to establish a long-term stable cooperative relationship, and get unanimous praise.
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Quality China Scsdn Environment Technology Co., Ltd. factory
Quality China Scsdn Environment Technology Co., Ltd. factory
Quality China Scsdn Environment Technology Co., Ltd. factory
Quality China Scsdn Environment Technology Co., Ltd. factory
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Introduction to SDN Environmental‑Protection Filter Materials and Filter Elements
2026-10-09
Introduction to SDN Environmental‑Protection Filter Materials and Filter Elements
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
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Brief Introduction to SDN Filtration & Concentration Machine
2026-09-16
Brief Introduction to SDN Filtration & Concentration Machine
    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.
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Water Treatment in the Lithium Battery Industry: From Compliant Discharge to Circular Water Sustainability
2026-08-20
Water Treatment in the Lithium Battery Industry: From Compliant Discharge to Circular Water Sustainability
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.
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Tel: 86-189-8175-1540 Tel: 86-189-8175-1540 Fax: 86-28-6174-7978 Fax: 86-28-6174-7978 Mobile Phone: +86 189-8175-1540 Mobile Phone: +86 189-8175-1540 E-mail: sdneptech@gmail.com 301, Building 11, Guoteng Technology Park, No.3 Xixin Avenue, Hi-Tech West District, Chengdu, China 301, Building 11, Guoteng Technology Park, No.3 Xixin Avenue, Hi-Tech West District, Chengdu, China

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