PROCESS FOR PRODUCING AN ACID SILICATE SOLUTION

摘要

A process for producing an acid silicate solution from an amorphous silica raw-material. The process comprising dissolving the silica raw-material in an organic acid, and is carried out in a where the silica raw-material is suspended in a liquid which contains the acid to produce a silica-containing suspension having a dry solids content of at least 10 %, calculated from the weight of the liquid, and a second step where silica is reacted with the acid in the suspension to produce a silicate solution having a silicon content of at least 0.1 % by weight. The process can be carried out in a continuous fashion and by carrying out the suspension step at high dry matter content, the volume of water that needs to be evaporated during the use of the solution can be greatly reduced.