Hydrometallurgical process for recovering in pure metal form...

Details Hydrometallurgical process for recovering in pure metal form... Hydrometallurgical process for recovering in pure metal form...

H - Electricity

01

M

204/73

H01M 10/54 (2006.01) C25C 1/18 (2006.01)

Patent

CA 1333267

A process for recovering in pure metal form substantially all lead from battery sludge is disclosed. The battery sludge is desulfurized, leached with acid, and separated by filtration. Lead is recovered from the filtrate by electrowinning. The residue from the leaching and filtration is treated with concentrated sulfuric acid to cause the simultaneous occurring of the following reactions: Cn(H2O)m + H2SO4 ? nC + H2SO4.mH2O (1) C + 2PbO2 + 2H2SO4 ? 2PbSO4 + CO2 + 2H2O (2) up to the quantitative reduction of substantially all of the lead dioxide PbO2 and elimination of substantially all the organic substances Cn(H2O)m contained in the insoluble residue. Lead sulfate from the above reaction is recycled to the desulfurization step.

580622

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