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Effect of Heat Treatment and Acid Leaching of Siliceous Mudstone on the Purity of Silica Precursors  

Cho, Kuk (Minerals and Materials Processing Division, Korea Institute of Geoscience & Mineral Resources)
Chang, Han-Kwon (Minerals and Materials Processing Division, Korea Institute of Geoscience & Mineral Resources)
Kil, Dae-Sup (Minerals and Materials Processing Division, Korea Institute of Geoscience & Mineral Resources)
Suh, Yong-Jae (Minerals and Materials Processing Division, Korea Institute of Geoscience & Mineral Resources)
Park, Jin-Ho (Minerals and Materials Processing Division, Korea Institute of Geoscience & Mineral Resources)
Jang, Hee-Dong (Minerals and Materials Processing Division, Korea Institute of Geoscience & Mineral Resources)
Publication Information
Journal of the Mineralogical Society of Korea / v.20, no.4, 2007 , pp. 247-253 More about this Journal
Abstract
The effect of heat treatment and acid leaching of siliceous mudstone on the purity of silica precursors, such as sodium silicate and silicic acid, was studied. As well as the temperatures for the heat treatment of siliceous mudstone, the concentrations of hydrochloric acid and sulfuric acid were varied to achieve the highest content of silicon in the precursors while minimizing energy and chemical consumption. It was found that the optimum conditions were achieved at the heat treatment temperature of $600^{\circ}C$ and hydrochloric acid of 1.56 M. The relative concentrations of silicon in the synthesized sodium silicate and silicic acid were as high as 99.2 and 99.5%, respectively.
Keywords
siliceous mudstone; heat treatment; acid leaching; sodium silicate; silicic acid;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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