Phosphoric Acid by Direct Sulfuric Acid Digestion of Florida Land- pebble Matrix.
White JC; Fergus AJ; Goff TN
NTIS: PB 247 322 :12 pages
Research was conducted by the Bureau of Mines to determine the technical feasibility of direct sulfuric acid digestion of Florida land-pebble phosphate matrix. Preliminary tests in a continuous digestion circuit showed that 92 to 96 percent of the p2o5 contained in the matrix was extracted, while the p2o5 concentration in the product acid ranged from 21 to 30 percent. The waste filter cake contained about 1 percent p2o5 and up to 18 percent water. These sandy compact filter cakes, comprised mostly of quartz and gypsum, appeared to be suitable for backfilling and reclamation of mined lands.
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