Process of preparing virtually cadmium-free calcium sulphate...

Details Process of preparing virtually cadmium-free calcium sulphate... Process of preparing virtually cadmium-free calcium sulphate...

C - Chemistry, Metallurgy

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C01B 25/238 (2006.01) C01B 25/22 (2006.01) C01B 25/223 (2006.01) C01B 25/226 (2006.01) C01B 25/229 (2006.01) C01F 11/46 (2006.01)

Patent

CA 1320034

AE 5400 22772-1093 A B S T R A C T Virtually cadmium-free calcium sulphate is produced in the preparation of a liquid medium containing phosphoric acid, which comprises digestion with a mineral acid of cadmium-containing phosphate rock and separation from the liquid medium containing phosphoric acid of at least a portion of the calcium in the phosphate rock after precipitation by means of a solution containing sulphate ions in the form of calcium sulphate, in which process halogen ions are present in an amount of 50-20.000 ppm during precipitation of the calcium sulphate to be separated.

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