Process for continuous electrochemical lead refining

Details Process for continuous electrochemical lead refining Process for continuous electrochemical lead refining

C - Chemistry, Metallurgy

25

C

C25C 1/18 (2006.01)

Patent

CA 2103991

The raw lead to be refined, whether of mineral origin or from reclaiming operations, the particle size of which has been reduced to a range not larger than 50 mm, is leached in a suitable apparatus with a solution of ferric fluoroborate in fluoroboric acid. During the leaching step, lead gets dissolved, with ferric fluoroborate being reduced to ferrous fluoroborate according to the following reaction: 2 Fe (BF4)3 + Pb ~ Pb(BF4)2 + 2Fe(BF4) (1) The leaching apparatus behaves hence as an external anode installed outside of the cell. The resulting solution is sent to the cathodic compartment of a diaphragm cell in which lead is deposited on a cathode of stainless steel, in compact, highly pure form, from which it is periodically won. The so depleted-of-lead solution is sent to the anodic compartment of the same cell, in which a suitable anode oxidizes ferrous fluoroborate to ferric fluoroborate.

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