METHOD FOR PROCESSING MANGANESE-CONTAINING MATERIALS

WIPO Patent Application WO/2005/040438

A1

The invention can be used for metallurgy, the electrotechnical and chemical industries. The inventive method for processing manganese-containing materials consists in transferring manganese and impurities into a solution by a two-stage treatment of an initial manganese-containing material by a mineral acid, i.e. at the first stage, by a chlorohydric or sulphuric acid and at the second stage, by the treatment of a non-soluble residue after decanting said solution by a chlorohydric acid at the ratio between the acid concentration at the first and second stages equal to 1:(1-6.6) associated with simultaneous absorption of a released chlorine by an alkaline solution. Said method also consists in reducing a medium pH to 3.5-4.5 by introducing a carbonate manganese ore, separating associated residual impurities, precipitating a manganese concentrate from filtrate in the alkaline medium in the presence of an oxidiser until the medium pH value is equal to 9.5-10.5. The pH value can be corrected, if necessary, by lime milk or an excess chloride-containing sodium hydroxide solution, filtering, washing and drying the concentrate. In the thus obtained manganese concentrate the manganese content is equal to or greater than 60 % and the phosphorus content is equal to or less than 0.08 %. The manganese extraction degree is equal to or greater than 92.8 %.

PAVLOV ANATOLY IVANOVICH
SHISHOVA IRINA VLADIMIROVNA

PCT/RU2003/000447

May 06, 2005

October 23, 2003

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OBSCHESTVO S OGRANICHENNOI OTV (RU)

C22B3/06; C22B3/20; C22B47/00; (IPC1-7): C22B47/00; C22B3/06; C22B3/20

RU2175991C1	2001-11-20
GB2161465A	1986-01-15
US3992507A	1976-11-16
US6171562B1	2001-01-09

Bubnova, Natella Konstantinovna (21 Ekaterinburg, 5, RU)

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