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.