| 摘要 |
The invention provides a process for the production of silica acid, comprising combining a silica-containing material with a calcium chloride solution, baking the mixture in an oven at a temperature of at least 800 DEG C to produce a cake, processing the cake into particles, leaching the same with a strong inorganic acid selected from the group consisting of hydrochloric acid, nitric acid and mixtures thereof at a temperature of up to 110 DEG C to produce a pulp, filtering the pulp to produce a silica acid sediment; and channeling the filtrate into a reactor for heating to evaporate HCI for reuse in the above leaching. |
