Electrolytic deposition of nickel sulfate solution
The lead antimony alloy is insoluble anode, the nickel sheet is cathode, the purified nickel sulfate solution is used as electrolyte, and the electrolytic deposition is carried out in the diaphragm electrolytic cell. When electricity is built directly into the electrolytic cell. The reaction of metal nickel deposition occurred on the cathode. On the new lead antimony alloy anode surface, lead can produce PbO2, which acts as a protective layer, making the anode into an insoluble anode.
The purified electrolyte is transported by pump and enters the electrolytic extraction through a heat exchanger. The temperature of the electrolyte is about 3.2 336k,ph, the nickel ion concentration is 75g/l, and contains sodium sulfate and boric acid. After the electrolyte enters the stage pole chamber, the ph rises to 4.0. The average current density of electrolytic deposition process is 183a/m2, the current efficiency is 94%, the yin and anode chamber is maintained with a certain liquid surface difference, so that the cathode fluid flows through the diaphragm into the anode chamber and becomes part of the anode liquid. Oxygen precipitation on the anode leads to an increase in the h+ of the anode solution. The anode liquid generally contains free acid 40g/l, which needs to be discharged from a part of the leaching workshop for coarseNickelOrNickelThe leaching of the matte. The anode is covered with a polyethylene film cover to collect precipitated oxygen. Product cathode nickel can reach a nickel standard.
Electrolytic deposition of nickel chloride solution
In the 1970s, the Kristianson nickel refinery in Norway completed an electrodeposition plant of nickel chloride solution with an annual output of 6800t nickel, with graphite or titanium plates with active layers of precious metal rights as insoluble anodes,NickelThe film is cathode, the cathode reaction is the same as nickel sulfate electrodeposition, and the reaction of producing chlorine gas occurs on the anode. The current density of the electrodeposition is generally 220-234a/m2, can also be up to 600a/m2, the current efficiency of up to 99.97%. In the anode made of fiberglass reinforced polyester (FRP) or other materials, the antioxidant or hydrochloric acid was collected by the extraction of chlorine gas.
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