Method for preparing white carbon black or high-purity silicon dioxide

Abstract

The invention discloses a method for preparing white carbon black or high-purity silicon dioxide. The method comprises the following steps: 1) preparing an ammonium fluosilicate solution and an ammonium fluoride solution for later use, 2) conducting a heating reaction on mineral powder containing silicon dioxide and the ammonium fluoride solution to form solid ammonium fluosilicate for later use and ammonia, 3) supplying the ammonia into the ammonium fluosilicate solution for reaction to form silica gel and ammonium fluoride containing filtrate for later use, 4) heating and drying the silica gel to form the white carbon black, thereby accomplishing a first production cycle, 5) allowing the mineral powder containing silicon dioxide and the ammonium fluoride containing filtrate obtained in the reaction in the last production cycle to react to form solid ammonium fluosilicate and ammonia, supplying the ammonia into the ammonium fluosilicate solution obtained in the reaction in the last production cycle to form silica gel and ammonium fluoride filtrate, and processing the silica gel to form the white carbon black, and 6) repeating step 5) and entering a circular production technology,wherein the mineral powder containing silicon dioxide is only required to be added in each new production cycle.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a method for preparing white carbon black or high-purity silicon dioxide. Background technique [0002] High-purity quartz is widely used in high-tech fields such as aerospace, atomic energy technology, laser technology, optical cable, and military industry, so it has also become a high-tech field developed by many countries. The purity of high-purity quartz is generally required to be above 99.99%. It is difficult to produce such high-purity quartz with ordinary quartz sand, so it needs to be prepared with high-purity vein quartz. However, at present, domestic high-purity quartz is heavily dependent on imports. On the one hand, there is a lack of domestic quartz sand raw materials for preparing high-purity silica, and on the other hand, the domestic silica preparation process needs to be improved. [0003] White carbon black is a white, non-toxic...

AI Technical Summary

Problems solved by technology

In this process, the reaction time between sodium hydroxide and quartz powder is as long as 10-16 hours, and the temperature is 120-180 ° C. At the same time, it is necessary to calcinate and thermally decompose calcium carbonate at about 1000 ° C. Not only the production cycle is long, the yield is low, but also the energy consumption very high, not feasible

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