Background
Micrometer or nanometer powder means the dimension of particle is too small to settle in liquid because of particle's Brownian motion. Thus, they exist as a state of suspended liquid, which cause solid- liquid separation of superfine particle become extremely difficult.
At present, nanometer powder produced by wet process normally contain various dissolved impurities ion, which affect application performance of final product . To increase the purity of nanoparticle product,most of the dissolved ion have to be removed. General way is to rinse super-fine powder slurry with plenty of pure of deionized water before spray drying. This is also involved in solid- liquid separation.
Traditional methods like gravity sedimentation, centrifuge are not so effective for desalination of slurry in so small particle size. Disadvantages are high product loss,low final product quality ,cloudy filtrated water discharge, too much water consumption,high labor and maintenance cost,etc.
Due to the nanometer pore size and “cross-flow filtration”,CRM membrane has been widely and successfully applied in nanometer particle production. All the nanometer particles will be rejected by the CRM membranes, while the dissolved ion will pass through. By continuously adding fresh pure water during filtration, the total dissolved solid will be reduced to a very low value.
Main characteristics of CRM membranes:
*Narrow mean pore-size distribution.
*Strong acid & alkali resistance.
*Solvent resistance.
*Oxidant resistance.
*Backwash allowable.
*High permeate flux.
*Easy regeneration.
Process Diagram
Process Advantages:
High rejection of nanoparticle
High quality of final nanometer product
Less rinsing water consumption
Reliable and stable performance
No use of filtration agent, low cost
High product recovery yield
Closed piping filtration, friendly condition
Low labor and maintenance cost
Less waste water discharge
Compact design with small foot print
Automatic control, easy operation
CRM Membrane for Nanoparticle Production:
Nanometer titanium oxide, zinc oxide, alumina oxide,etc
Nanometer barium titan ate, barium carbonate
Nanometer silicon dioxide, aluminum powder
Nanometer silver powder
Nanometer titanium silicon molecular sieve
Nanometer graphene powder
If you need more details about ceramic membrane process for nanometer particle ,please do not hesitate to contact with us or send email to us. TFT is willing to communicate and share information with you on engineering process issues. We are looking forward to developing more market and more applications with your help, bring this new technology to end users, create more values and benefits for all parties.
