Process of making manganous sulphate solution with low level imp

Details Process of making manganous sulphate solution with low level imp Process of making manganous sulphate solution with low level imp

1980-04-25

1981-08-25

Carter, Herbert T.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group viib metal

423 49, 423544, 423605, C01G 4510

Patent

active

042859131

ABSTRACT:
Large proportion of available manganese ores contain high proportions of potassium. Electrolytic manganese dioxide (EMD) is manufactured from manganous sulphate obtained from naturally occuring manganese ores. Crystallographically EMD has to be essentially gamma phase and other phases, alpha and beta should be the bare minimum. High potassium content is, however, an obstruction in the way of getting gamma phase EMD. The present invention describes a method of making manganous sulphate solution with low level impurity of potassium from high potassium ores which comprises adding the reduced ore to spent electrolyte containing ferric ions and digesting same at pH 1-2 and temperature of 60.degree.-90.degree. C. for 1-4 hours, and thereafter again adding reduced ore to the digested product till pH is raised to 4-6.

REFERENCES:
patent: 3227520 (1966-01-01), Samonides

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