Multiple-stage thermal beneficiation process for phosphate ores

Details Multiple-stage thermal beneficiation process for phosphate ores Multiple-stage thermal beneficiation process for phosphate ores

1982-01-12

1983-06-21

Hearn, Brian E.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423304, 423319, 432 15, C01F 100, C01F 500, C01F 1100, C01B 2526

Patent

active

043893805

ABSTRACT:
A multiple-stage thermal beneficiation process for phosphate ores which comprises calcining a phosphate ore in a first stage at a temperature sufficient to destroy substantial quantities of organic impurities in the phosphate ore but not so high as to cause excessive sulfide formation; followed by the calcining of the product from the first stage in a second stage at a temperature at which an additional amount of organic carbon impurities are destroyed but at a temperature which does not detrimentally reduce the surface area of the phosphate ore.

REFERENCES:
patent: 3995987 (1976-12-01), MacAskill
patent: 4017585 (1977-04-01), Angevine et al.
patent: 4325928 (1982-04-01), Lowe

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