All beneficiation methods which were tested increase the purity of the sand above minimum high-silica specifications. The best results were obtained, however, with a water-washed sand placed in an 18 N solution of sulfuric acid for a period of 40 minutes at a temperature of 140ø C. This leaching method produced a sand that meets specifications for the first quality glass sand.
Pinsak, A. P. 1956, High-silica sand potentialities of the Ohio River Formation: Indiana Geological Survey Bulletin 09, 54 p., 7 fig.
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