Process for producing solid manganese dioxide

Details Process for producing solid manganese dioxide Process for producing solid manganese dioxide

1994-01-12

1995-03-28

Bos, Steven

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group viib metal

423 51, 423605, C01G 4502

Patent

active

054014778

ABSTRACT:
A process for producing manganese dioxide comprising the steps of:
(1) reacting manganese oxide with a molar excess of an aqueous chloric acid solution in a reaction zone to form a reaction mixture in said zone comprising chlorine gas, a solid phase containing manganese dioxide, and a liquid phase containing chloric acid and water; the concentration of chloric acid in said liquid phase is greater than about 5% by weight of said liquid phase upon leaving the reaction zone;
(2) separating said chlorine gas from said solid phase and said liquid phase;
(3) separating said solid phase containing manganese dioxide from liquid phase containing chloric acid and water;
(4) removing water from said separated liquid phase to concentrate said chloric acid in said separated liquid phase; and
(5) returning said separated and concentrated liquid phase back to said reaction zone for further reaction with manganese oxide.

REFERENCES:
patent: 2956860 (1960-10-01), Welsh
patent: 3056656 (1962-10-01), Nicolaisen
patent: 3640683 (1992-02-01), Miyazaki et al.
patent: 4006217 (1977-02-01), Faber et al.
patent: 4402931 (1983-09-01), Tanabe et al.
patent: 5279743 (1994-01-01), Ward et al.
Kauffman, J. W. et al., "Particulate manganese dioxide . . . manufacture", Faming Zhaanli Shenging Gongkai Shuomingshu, 49-3, Feb. 1987, pp. 1-12.

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