Ceramic membrane silica sol concentration has obvious advantages

SiO2 is a colloidal dispersion of nano silica particles dispersed in water (or organic solvent), also known as silicic acid solution. Silica sol is a colorless or milky transparent liquid. It is a nano material with excellent properties. Amorphous silicon particles are evenly dispersed into colloidal solution in water or organic solvent. The inner layer is a network structure composed of multi-layer micelles, which has excellent properties such as large specific surface area, high adsorption and special high dispersion, such as high heat resistance and heat insulation. It is widely used in precision casting, textile, catalysis, papermaking, coating and other industries.

In the production of silica sol, domestic manufacturers generally use ion exchange method. The silica sol produced by this method has small particles, but its particle size can reach 10 ~ 20 microns, and the particle surface is not obvious. It can not be used in industries with high requirements for silica sol, such as catalysts and other industries. The concentration section of silica sol production is a long cycle process with high energy consumption.

The research shows that through several application projects of silica sol concentrated by ceramic membrane, we have mastered the reliable application process and parameters of silica sol concentrated by ceramic membrane, and have made a major breakthrough in membrane separation research: the treatment capacity of ultrafiltration organic membrane makes silica sol reach more than 30%. When the concentration is greater than 30%, the ultrafiltration organic membrane is seriously worn, lost rapidly, and easy to cause irreversible damage. At this time, The module can only be replaced. Compared with ultrafiltration organic membrane, inorganic ceramic membrane can make the silica sol concentration reach more than 40%. After cleaning, it can quickly restore the production capacity and continue to be used.

Compared with many organic membranes, inorganic ceramic membranes have the advantages of high temperature resistance, stable structure, uniform pore size distribution, good chemical stability, not easy to be eroded by microorganisms, high mechanical strength and easy regeneration. This characteristic determines its wide application in water treatment.