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Recovery of Phosphate From Florida Phosphate Slimes
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  • Description:
    The Bureau of Mines conducted tests on samples of two Florida phosphate slimes t6 devise a technique to recover phosphate currently dis-carded because of its fine size. A flotation technique was devised to recover the phosphate contained in two fractions of each slime: the plus 37um fraction and the plus 20-um fraction. The technique involved conditioning the flotation feed with sodium silicate and a fatty acid-fuel oil emulsion, floating a rougher phosphate concentrate, and cleaning the concentrate in two cleaner stages with sodium silicate added to each for gangue depression. Concentrates containing 21.0 to 32.3 pct P20S were produced with recoveries of 68.1 to 84.2 pct of the P20S con-tained in the flotation feed.

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