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Beneficiation of unweathered Indian calcareous phosphate rock by calcination and hydration.

Authors
Good-PC
Source
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 8154, :1-17
Link
NIOSHTIC No.
10007779
Abstract
Unweathered low-grade calcareous phosphate rock of about 20 percent P2O5 grade was beneficiated by a precedure in which contained carbonates were decomposed by calcination at about 1,000 deg c. On quenching the hot calcined rock in water, major impurities passed into a slime phase which was mechanically separated from a coarser concentrate fraction. Phosphate rock of two major types was beneficiated in batch-scale studies yielding concentrates containing 31.3 to 38.5 percent P2O5 at recoveries ranging from 54.8 to 86.0 percent. The samples were from two major deposits in India. Processing information gained was utilized in extending the work to a continuous-flow system, processing phosphate rock at rates to 157 kilograms per hour. Superphosphate exceeding 16 percent water- soluble P2O5 was prepared from concentrate derived from continuous- flow processing.
Publication Date
19760101
Document Type
Report of Investigations
Fiscal Year
1976
NTIS Accession No.
PB-257383
NTIS Price
A03
Identifying No.
RI-8154
NIOSH Division
ALRC
Source Name
Albany, OR: U.S. Department of the Interior, Bureau of Mines, RI 8154
State
OR
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