Leaching of phosphate values from two central Florida ores using H2S04-methanol mixtures.
Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 9094, 1987 Jan; :1-9
The Bureau of Mines conducted preliminary investigations on the use of an acid-alcohol leaching technique for recovering phosphate values from phosphate matrices. H2SO4 and methanol were used as the leaching agents. Starting-matrix particle size and acid-apatite ratio were found to significantly affect the efficiency of phosphate leaching. Phosphate extractions of more than 80 pct were obtained when minus 200-mesh ore was used and the acid-apatite ratio was 8:1 or more. The iron and aluminum oxide impurities (R2O3) present in the crude acid products were monitored, and R2O3-P2O5 ratios are reported. Phosphate extractions in excess of 80 pct also were obtained when phosphatic clay wastes were leached. Typically, leach slurries filtered using test leaf filters exhibited filtration rates of 100 lb/(h.Ft2) or more.
Solvent-extraction; Sulfuric-acid; Phosphoric-acids; Extractive-metallurgy; Phosphate-deposits; Mineral-industries
IH; Report of Investigations
NTIS Accession No.
Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 9094