Gold River adoption soluble anode and the cathode by electrolytic cobalt produce electricity. The production uses 12 electrolytic cells, the specification is 2060mm × 790mm × 860mm, and two tanks are used for liquid production. The electrolyte is a chloride system, and the chemical composition of the cathode new liquid is listed in Table 1.
Table 1 Composition of cobalt electrolysis new liquid (g∕L)
The main technical conditions for cobalt electrolysis are as follows:
Anode size and number of sheets: 500mm × 230mm × 40mm, 22 pieces per slot
Same pole center distance: 180mm
Specifications and number of pieces: 540mm × 520mm, 10 pieces per slot
Electrolysis temperature: 55 ~ 65 ° C
Current density 300~400A∕m 2
Slot voltage: 1.6~2.2V
Electrolyte circulation: 16 ~ 220ml min (min · bag)
Negative liquid level in the anode and cathode area: 30~50mm
Cathode cycle: 3 days
Composition of cobalt electrolysis anolyte:
The anolyte is cleaned and decontaminated together with the reconstituted liquid, and then returned to the electrolysis as a new cathode liquid. The main impurity removal operations are nickel removal, copper removal, lead removal and iron removal. The main process conditions for purification and impurity removal are listed in Table 2.
Table 2 Main process conditions for removing impurities from electrolytic cobalt anolyte
The purified slag is removed by pressure filtration, and the cobalt-containing iron slag is returned to be slurried and reduced by the cobalt slag of the nickel system. After purification treatment, the solution reaches the requirement of producing catholyte for electrocobalt, namely: Co>100g∕L, Fe<0.001g∕L, Cu≤0.003g∕L, Pb≤0.0003g/L, Zn≤0.007g∕L .
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