Application of membrane technology in the concentration of nano powder

Various filtration technologies using filter cloth as the filtering medium have poor washing effect, high labor intensity, and difficulty in achieving large-scale centrifugal separation technology. In addition, general industrial centrifuges can only separate particles with a diameter of micrometers, and the operation is complex, with high labor intensity and low efficiency.

The membrane separation equipment integrated with the production process technology of nano powder has solved the technical bottlenecks such as solid-liquid separation of nano powder suspension, impurity removal, process continuity, etc; While optimizing the design of the process to the application system has improved the filtration flux and the process stability of long-term operation, and developed a washing and purification method for the preparation of titanium, aluminum, zirconium, silver, yttrium, silicon, iron, calcium, niobium, nickel, cobalt and other oxides or simple matter nano powder, which has produced significant technical, economic and social benefits.

In the process of producing nanoscale ultrafine powders by wet chemical method, it is necessary to wash the ultrafine product slurry rich in impurity ions to improve purity. Unlike traditional plate and frame filtration and centrifugal separation, the Shengchuan membrane ultrafine powder refining equipment mainly uses cross flow filtration in solid-liquid separation, resulting in better product quality.

When the superfine powder refining equipment is running, the slurry of the superfine powder and nano powder equipment is continuously circulating on the circulating side, and the membrane surface can intercept and retain the superfine powder particles, while allowing the impurity ions in the solution to seep through the membrane pores. Due to the parallel flow of fluid to the surface of the filter medium, the filtration resistance is greatly reduced, allowing for a higher permeate flux to be maintained at lower pressures and enabling continuous filtration operations for longer periods of time.

The main process characteristics of Shengchuan membrane ultrafine powder refining equipment are:

1. Ultra fine powder refining equipment and nano powder equipment have extremely high filtration precision, which can be used in the ultra-fine powder system with good dispersion, high rejection rate of ultra-fine powder and simple operation.

2. The cleaning effect of Shengchuan membrane ultrafine powder refining equipment is good, and it can prepare ultra pure powder with a purity greater than 99.5%. The water passing through does not contain particles and has no loss, and the pollution of discharged water is small. Less water washing can save more than 30% of cleaning water.

3. Shengchuan inorganic ceramic membrane has the advantages of corrosion resistance, high mechanical strength, good chemical stability, narrow pore size distribution, high temperature resistance, and strong anti microbial ability. It does not interact with microorganisms and can achieve online steam disinfection. It can be repeatedly cleaned, regenerated, and has a long service life. When processing powder washing and concentration, it has the advantages of easy operation, stability, continuous operation, high automation, low labor intensity, high production efficiency, good effluent quality, and small footprint. In recent years, it has been widely used in the production of ultrafine powders.