In the manufacture of phosphate fertilizer, compounds of fluorine are evolved. The amount of fluorine occurring in the phosphate rock used each year in the United States is about 8000 tons. It is proposed to utilize this material industrially. If the tower gases are passed through the water, reaction 3 SiF4 + 3 H2O → H2Sio3 + 2 H2SiF6 takes place. The solution is treated to recover the silicon fluoride as MgSiF4. The precipitated silicic acid is filtered out, dried and has good adsorptive properties. The adsorption value depends upon the acidity and other conditions. The silica obtained has better adsorption properties than "Silica Gel".
Proceedings of the Iowa Academy of Science
©1924 Iowa Academy of Science, Inc.
Sweeney, O. R.; Pfeffer, Frederic D.; and Redstone, Arthur L.
"Method of Preparing Silica Absorbents,"
Proceedings of the Iowa Academy of Science, 31(1), 290-290.
Available at: https://scholarworks.uni.edu/pias/vol31/iss1/85