CRM for Nanoparticle Purification

At chemical engineering etc. field usually face solid-liquid separation process of powder suspend liquid. Along with the technological advance, the dimension of particle is gradually tended in super-pure particle, solid- liquid separation of superfine particle, especially non-homogeneous phase solid- liquid separation makes extremely difficult. Because of particle's Brownian motion, traditional gravity's sedimentation almost can't use.

Considering each kind of filtration technique with filtering cloth as percolation, on the one hand retention performance to super-fine particle filtration becomes bad, product makes a lot loss because of the limitation of percolation, on the other hand it is depend on bridging function of filtration cake layer particle to carry out particle retention , if the grain is more small, filtration cake layer of formation becomes more and more compact, the filtration resistance is also more big, filter speed is more and more small, the rinse which filters is also very difficult, rinsing result is too bad, operate labor strength is heavy.

Centrifugation separation is hard to realize macro-scale operation, general industrial centrifuge can separate the micro size of particle and rinse operation is complex, laboring strength is heavy, and the efficiency is low. Water power spiral ware is also the function which depends on centrifugation separation, makes the solid particle to carry on separation, but mainly is applied in the liquid mutually wet method ratings, and it generally separates above 10 microns of critical particle. At the process of producing nanometer super-fine powder by means of wet chemistry method, superfine powder slurry that contain impurity ions need to be cleaned again and again in order to improve product purity through removing impurity ions. Solid-liquid separation to some nanometer slurry using traditional plate frame hydraulic press, high - velocity centrifuge and other cleansing methods doesn’t run effectively in a dispersion system with nanometer and excellent dispersion , exists the problems of powder loss, cloudy permeating solution, large capacity of washing water, high

labor strength ,etc..

CRM ceramic membrane application in the liquid separation field becomes extensively in recent years, due to the special way of “cross-flow filtration”, excellent physical, chemical performance and mechanical strength, it provides the Technical Characteristic

l-High filter accuracy, filtering pore diameter can reach nanometer;

l-High retention ratio of superfine powder, no loss for expensive powder;

l-Super-high purity of superfine powder;

l-Permeate solution is clean and transparent, free of particles and low pollution;

l-quipment is simple, convenient operation;

l-PLC full-automatic control, the labor strength is low;

l-Integrated with reverse osmosis membrane filtration equipment making pure water, the total operation cost is low.

Range of Application for Nanoparticle Production

l-Nanometer titanium oxide, zinc oxide, alumina oxide and other oxides;

l-Nanometer barium titan ate, barium carbonate and other nanometer inorganic salt;

l-Nanometer silicon dioxide, aluminum powder and others;

l-Nanometer kaolin, montmorillonite and other minerals;

l-Nanometer medicament;

l-Nanometer titanium silicon molecular sieve;

l-Rinsing and recovery of nanometer catalyst