Method for beneficiation of phosphate rock

Details Method for beneficiation of phosphate rock Method for beneficiation of phosphate rock

1984-03-16

1985-04-16

Heller, Gregory A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423107, 423319, C01F 100, C01F 500

Patent

active

045115435

ABSTRACT:
The present invention relates to a method for beneficiation of phosphate rock by a thermal treatment, wherein an appreciable increase in P.sub.2 O.sub.5 and decrease in cadmium contents in the calcined product are achieved. According to the invention, the phosphate rock is contacted with hot gases possessing a temperature in the range of between 700.degree. C. to 1600.degree. C. for a period of below 60 seconds and subsequently the fines are removed by a conventional classification method thus obtaining an up-graded phosphate product with a relatively low cadmium content. The up-graded phosphate product is also characterized by a relatively low sulfide content as well as low organic matter, which are very advantageous in the phosphoric acid manufacture therefrom. One of the advantages of the method is the almost complete recovery of the P.sub.2 O.sub.5 present in the phosphate rock since no slaking for calcium oxide removal is utilized.

REFERENCES:
patent: 1161885 (1915-11-01), Rigg
patent: 4017585 (1977-04-01), Angevine et al.
patent: 4263262 (1981-04-01), Jukkola
patent: 4389380 (1983-06-01), Parks

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