Method for recovering silver from refractory manganese ores

Details Method for recovering silver from refractory manganese ores Method for recovering silver from refractory manganese ores

1990-05-01

1991-10-08

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

435838, C22B 300

Patent

active

050551302

ABSTRACT:
A method for recovering silver from a refractory manganese dioxide-silver ore. The ore is contacted with an effective amount of a culture of direct manganese-reducing Bacillus polymyxa bacteria. The ore-bacteria mixture is maintained at an approximately neutral pH until a sufficient amount of the manganese dioxide in the ore is reduced from Mn(IV) to Mn(II). The silver present in the ore is then recovered by conventional methods such as cyanide leaching.

REFERENCES:
patent: 4357423 (1982-11-01), Cox
patent: 4740243 (1988-04-01), Krebs-Yuill
patent: 4752332 (1988-06-01), Wu
patent: 4765827 (1988-08-01), Clough
patent: 4822413 (1989-04-01), Pooley
Nealson et al., Offprints from Metal Ions and Bacteria, pp. 383-411 (John Wiley & Sons, 1989).

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