Background Introduction:

During the production of nano-sized fine powder by the wet chemical method, various cation and anion impurities remain after the synthetic chemical reaction. Failure to clean these thoroughly can affect the performance of the fine (nano) powder. Therefore, the process requires washing the slurry of the fine product to remove impurities and increase purity. Traditional methods, such as plate and frame filtration and high-speed centrifugation, are used, but these are slow and the washed powder tends to leak.Cloudy filtrate, high water consumption for washing, environmental pollution, powder loss, and high labor intensity.

Application of Membrane Separation Technology in the Purification of Nanopowders

Addressing the aforementioned issues,He Cheng FiltrationBased on years of experience in membrane separation technology applications, we have integrated membrane separation technology into the production process of nano-powders.Currently,"HC Filtration" has over a dozen successful cases in the nano-powder industry!

Inorganic ceramic membraneSystem”Made from porous inorganic ceramic material as the support, coated on the surface and fired at high temperatures, it boasts high separation accuracy, good properties, and stable operation. When processing industrial fluids, it is more resistant to pollution, acids, alkalis, and temperature than membranes, thus:BeWidely applied in the separation of complex fluids with high solid content, high viscosity, and hard particles.Applications in the field of nano-powder washing and purification include: nano-catalysts, nano-titanium dioxide, zinc oxide, aluminum oxide, and other metal oxides, nano-barium titanate, barium carbonate, and other nano-inorganic salts, nano-zirconium hydroxide, strong-oxidizing hydroxides, silver powder, and other suspensions for washing and purification.

CeramicMembrane separation technology resolves technical bottlenecks such as slow removal of impurities in nanometer powders, low powder yield, and non-continuous processes.EffectiveRemoveRaw MaterialImpurities in the Chinese medium, preparationExcludingFine pure nano powder.

Nanopowder separation and purification membrane technology: 

Membrane separation technologyNanometerPowder separation and purificationTheAdvantages;

① High filtration accuracy, high retention rate for fine powders, almost no loss or leakage, the concentration of the concentrated solution can reach20%, high liquid clarity.

② Excellent cleaning effect, no powder leaching, capable of producing high purity fine powder.

③ Inorganic ceramic membrane elements, with high-temperature and strong acid/base resistance, featuring a long service life for the membrane elements.

④ The washing process allows for controllable technological parameters, which aids in enhancing the dispersibility of the powder.

⑤ The main body of the equipment is manufactured using hygienic-grade stainless steel material.

⑥ ControlSystemConfigurable for manual and semi-automatic based on customer requirementsOrPLC fully automatic control, easy operation and maintenance of equipment.

⑦ Washing water availableFurther RO membrane treatment, returning water to the washing process, reduces water consumption costs.