Method for electrolytically synthesizing granular manganese dioxide

Abstract

PURPOSE:To form the title granular manganese dioxide by electrolyzing an aq. soln. of manganese sulfate acidified with sulfuric acid while periodically reversing the polarity of an anode and a cathode and agitating the electrolyte. CONSTITUTION:The electrolyte consisting of sulfuric acid-acidified aq. soln. of manganese sulfate (contg. about 10-60g/l bivalent manganese) is supplied to an electrolytic cell 1 at a high speed of >=0.1m/sec with respect to the surface of an electrode, the electrolyte is agitated, and the polarity of the anode and cathode is reversed in a cycle of <=60min, and electrolysis is carried out. As a result, granular manganese dioxide is formed in the electrolyte. The discharged liq. after electrolysis is sent to a receiver tank 2, the formed manganese dioxide is settled therein, and the electrolyte is circulated to the electrolytic cell 1 by a pump 3. The slurry is drawn off from the lower part of the receiver tank 2, and the granular manganese dioxide is separated from the liq. by a filter 4 and taken out. By this method, granular manganese dioxide is continuously and efficiently formed.

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    JP-2015518083-AJune 25, 2015マクダーミッド アキューメン インコーポレーテッド, マクダーミッド アキューメン インコーポレーテッド三価マンガンを含む酸性溶液を用いたプラスチックのエッチング