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Phosphate from wastes via acid leaching in the presence of methanol.

Authors
Wilemon GM; Swanton RG; Davis JG; Scheiner BJ
Source
Miner Metall Process 1990 Nov; 7(4):201-205
Link
NIOSHTIC No.
10011760
Abstract
The U.S. Bureau of Mines has conducted investigations on extracting phosphate values from wastes generated during the mining and beneficiation of phosphate matrix. These wastes may contain up to one third of the phosphate originally present in untreated ore. Samples of wastes were air-dried and leached using 93 pct sulfuric acid in the presence of methanol. Evidence for the formation of a calcium sulfate hemihydrate coating that hinders complete dissolution of phosphate is presented. Solid-liquid separations were enhanced when flocculation was effected using poly(ethylene oxide)(peo) in conjunction with hydroxypropyl cellulose (hpc) or hydroxyethyl cellulose (hec). A conceptual flowsheet for a proposed process using an acid-alcohol leaching technique is presented.
CODEN
MMPRE8
Publication Date
19901101
Document Type
OP; Journal Article
Fiscal Year
1991
Identifying No.
OP 167-91
Issue of Publication
4
ISSN
0747-9182
NIOSH Division
TURC
Source Name
Minerals & Metallurgical Processing
Page last reviewed: October 1, 2021
Content source: National Institute for Occupational Safety and Health Education and Information Division