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Leaching of phosphate values from two central Florida ores using H2S04-methanol mixtures.

Authors
Wilemon-GM; Scheiner-BJ
Source
Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 9094, 1987 Jan; :1-9
Link
NIOSHTIC No.
10005721
Abstract
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.
Keywords
Solvent-extraction; Sulfuric-acid; Phosphoric-acids; Extractive-metallurgy; Phosphate-deposits; Mineral-industries
Publication Date
19870101
Document Type
IH; Report of Investigations
Fiscal Year
1987
NTIS Accession No.
PB88-110952
NTIS Price
A03
Identifying No.
RI-9094
NIOSH Division
TURC
Source Name
Tuscaloosa, AL: U.S. Department of the Interior, Bureau of Mines, RI 9094
State
FL; AL
Page last reviewed: September 2, 2020
Content source: National Institute for Occupational Safety and Health Education and Information Division