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Electrolytic lead slurry is achieved galena and gold oxide electrolysis cell in a process of reduction of two metal lead, a schematic cell shown below, the electrolytic cell by a diaphragm into an anode compartment and a cathode compartment, and a tank equipped with a stirring apparatus The heating device has an anode material of graphite and a cathode material of a lead electrode sheet. The electrolyte is an acidic sodium chloride solution.
During electrolysis, the lead concentrate is continuously added to the anode chamber to oxidize the galena in the lead concentrate to lead chloride and elemental sulfur, and the lead ions are separated from the cathode by a sponge lead through the separator. Electrolytic extraction of sponge lead from the cathode chamber for a certain period of time, melting and casting into lead ingot; extracting the slurry from the anode chamber, filtering it hot, returning the filtrate to the electrolytic cell, and treating the residue to recover elemental sulfur. The figure below shows the flow chart of lead slurry electrolysis.
The conditions of lead ore pulp electrolysis are: sodium chloride with electrolyte concentration of 250-350g/L, lead of lOg/L, pH=1.5, temperature of 70 °C , current density of 90A/m 2 , and cell voltage of 1.9-2.0. V. The main technical indicators are: lead leaching rate >98%, slag containing lead of 1.57%, slag rate of 39.3%, and electrical lead consumption of 500 kW·h.
Lead ore pulp electrolysis completes the oxidation of galena and the precipitation of metallic lead in one tank, which basically eliminates lead pollution. However, there are still problems in that it is difficult to continuously and continuously produce in a long period of time, and the produced sponge lead must be processed again, and the electrolytic cell is difficult to be enlarged.
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