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PROCESS OF PREPARING VIRTUALLY CADMIUM-FREE CALCIUMSULPHATE FROM CADMIUM CONTAINING PHOSPHATE ROCK
PROCESS OF PREPARING VIRTUALLY CADMIUM-FREE CALCIUMSULPHATE FROM CADMIUM CONTAINING PHOSPHATE ROCK
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机译:从含磷磷酸盐岩中制备虚拟无镉硫酸钙的方法
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摘要
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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