The Synthesis of Silica From Opal-Cristobalite Rocks Biomorphic. Properties. Application
Covers three methods for the synthesis of silica from opal-cristobalite rocks biomorphic. It was found that the yield of amorphous silica fume (opal) depends on: the temperature of rock calcination before exposure in the electrolyte; the temperature and concentration of an aqueous solution of caustic soda; the method of silicon dioxide deposition; the duration of rock exposure in the electrolyte and the phase ratio of liquid and solid (W:T). The optimal technological regimes of opal synthesis are determined by the methods of planning extreme experiments, which provide: the highest yield of the final product; high chemical purity; the dimension of opal particles in the nanometer range.