The concentrate analyzing 97% sillimanite free from shell were achieved from the initial ... Silica extract from Malang beach sand via leaching and sol-gel methods ... Trans. IMM, C 98(1989), p.157-177. xi. F.H.B. De Castro, M.C. De Hoces, and A.G. Borrego, The effect of pH modifiers on the flotation of celestite with sodium oleate and sodium ...
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