Magnesium separation from dolomitic phosphate by sulfuric acid l

Details Magnesium separation from dolomitic phosphate by sulfuric acid l Magnesium separation from dolomitic phosphate by sulfuric acid l

1993-09-24

1994-11-08

Langel, Wayne

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423169, C01F 500

Patent

active

053624602

ABSTRACT:
Process for dissolving unwanted magnesium from phosphate ores by leaching with dilute sulfuric acid at automatically controlled pH. Minerals so treated are more easily converted by the conventional "wet" process into phosphoric acid, and yield better quality phosphoric acid. Magnesium So leached is precipitated with lime or dolime in a second conventional processing step to make byproduct magnesium hydroxide. An anion such as nitrate, acetate or formate is maintained in the recirculating leach solution in concentration sufficient that calcium sulfate does not precipitate with product magnesium hydroxide. Nearly pure carbon dioxide can be recovered as a second byproduct.

REFERENCES:
patent: 3522003 (1970-07-01), Lopker
patent: 4154799 (1979-05-01), Hauge
patent: 4181703 (1980-01-01), Wengeler et al.

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