Process for the manufacture of artificial manganese dioxide
Abstract
Abstract PRODUCTION OF ARTIFICIAL MANGANESE DIOXIDE BY INTENSIVELY MIXING TOGETHER, IN AQUEOUS PHASE, MANGANESE-(II) SALTS, HYPOCHLORITE AND COMPOUNDS PRODUCING AN ALKALINE REACTION, WASHING OUT PRECIPITATED MANGANESE DIOXIDE AND DRYING IT. MORE PARTICULARLY, MANGANESE DIOXIDE WITH AN APPARENT DENSITY OF MORE THAN 0.8 GRAM/CUBIC CENTIMETER IS PRODUCED BY USING THE STARTING MATERIALS IN THE QUANTITATIVE RATIO NECESSARY TO ESTABLISH AND MAINTAIN A PH-VALUE HIGHER THAN 8, DURING AND FOLLOWING THE PRECIPITATION, THE PH-VALUE SELECTED BEING THE HIGHER THE HIGHER THE APPARENT DENSITY OF THE RESULTING FINAL PRODUCT SHALL BE. THE RESULTING PRODUCT, WHICH MAY BE PREDRIED IF DESIRED, IS WASHED WITH A NON-REDUCING ACID AT A PH-VALUE OF LESS THAN 2 UNTIL FREE FROM ALKALI, WASH ACID IS REMOVED, AND THE MANGANESE DIOXIDE IS DRIED AT TEMPERATURES BETWEEN 100 AND 350*C.
Inventors
- 👤 E Preisler
- 👤 K Grapentin
- 👤 H Harnisch
- 👤 G Mietens
Bibliographic Details
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