| 摘要 |
PROBLEM TO BE SOLVED: To make silica made from a natural product occurring in nature still finer.SOLUTION: There is provided a method for producing finely powdered silica comprising forming a silica-containing solution formed by dissolving precipitated silica derived from a natural product in carbon dioxide in a silica-containing solution formation tank 23, compressing the silica-containing solution by means of a compressor 24, thereafter ejecting the compressed silica-containing solution through an ejection mechanism 25 to effect its rapid pressure reduction and expansion to thereby evaporate the carbon dioxide from the solution, and recovering the finely powdered silica in a finely powdered silica recovery tank 26. |
