VERFAHREN ZUR KONTINUIERLICHEN HERSTELLUNG VON ELEKTROLYTISCHEM MANGANDIOXID

1419047 Electrolytic production of manganese dioxide MITSUI MINING & SMELTING CO Ltd 15 March 1974 [20 Sept 1973] 11752/74 Heading C7B In a method for the continuous production of manganese dioxide by electrolysis of an aqueous manganese sulphate - sulphuric acid solution, manganese ore containi...

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Hauptverfasser:	ERA, AKIO, EMOTO, TAKEO
Format:	Patent
Sprache:	ger
Schlagworte:	APPARATUS THEREFOR CHEMISTRY ELECTROLYTIC OR ELECTROPHORETIC PROCESSES ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTIONOF COMPOUNDS OR NON-METALS METALLURGY
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Zusammenfassung:	1419047 Electrolytic production of manganese dioxide MITSUI MINING & SMELTING CO Ltd 15 March 1974 [20 Sept 1973] 11752/74 Heading C7B In a method for the continuous production of manganese dioxide by electrolysis of an aqueous manganese sulphate - sulphuric acid solution, manganese ore containing magnesium as an impurity is leached with spent electrolyte containing sulphuric acid followed by neutralization to give a neutral aqueous manganese sulphate solution, at least part of which solution is concentrated under reduced pressure at a temperature between 40C and 60C to the concentration corresponding to saturation at a lower temperature between 15C and 50C, and is thereafter rapidly cooled to a temperature from 15C to 25C which is below the saturation point of the solution, to give crystals containing magnesium sulphate, which crystals are filtered off, and the filtrate is fed to the electrolytic cell whereby the magnesium content in the electrolyte in the form of magnesium sulphate is maintained at not more than 45g/1.