Method for removing impurities from nickel electrolysis anolyte
A technology of anolyte and nickel electrolysis, applied in electrolysis process, electrolysis components, photographic technology, etc., can solve problems such as hindering copper removal, achieve fast reaction speed, ensure copper removal depth, and eliminate adverse effects
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Embodiment 1
[0031] Embodiment 1: the comparison of the solution copper removal treatment process prepared by nickel salt and copper salt
[0032] According to the method of the prior art (Wang Feidysium, et al. Research on deep purification and copper removal from nickel electrolyte by nickel sulfide precipitation conversion method, Hunan Metallurgy, 1993, 5:21-23.), when using the prepared solution to be treated (nickel The content of ions is 65g / L, the content of copper ions is 0.6g / L, the solution of sodium ions is 33.4g / L, and the content of chloride ions is 51.6g / L.) When removing copper, add newly prepared NiS, and the reaction formula is:
[0033] NiS+Cu 2+ →CuS+Ni 2+ (1)
[0034] The reaction time is more than 40 minutes, and the copper removal rate of 99.4% can be achieved. When using 1.2 times (NiS / Cu molar ratio) optimal amount of NiS to remove copper, although the copper can be removed to 1.2mg / L, the excess NiS enters the copper removal slag, resulting in the ratio o...
Embodiment 2
[0044] Embodiment 2: different solutions to be treated use FeS to remove copper addition and time comparison
[0045] Under the conditions of FeS / Cu molar ratio of 1.2 and reaction time of 10 minutes, the effects of different solutions to be treated on the copper removal effect of FeS were studied, and the results are shown in Table 2. The nickel electrolytic anolyte used in the factory comes from Jinchuan Group, in which the content of nickel ions is 75.5g / L, the content of copper ions is 0.5g / L, the solution of sodium ions 25g / L, chloride ions 74.9g / L, and cobalt ions 0.15g / L, iron ion 0.35g / L.
[0046] Table 2. Copper removal effect of FeS in different solutions to be treated
[0047]
Homemade Nickel and Copper Salt Solutions
Anolyte for nickel electrolysis in factory
Residual copper concentration / mg / L
0.80
0.82
Ratio of copper to nickel in copper removal slag
55
9.6
[0048] Self-made nickel salt and copper salt so...
Embodiment 3
[0051] In Example 3-11, the nickel electrolysis anolyte used comes from Jinchuan Group, and its composition is: the content of nickel ion is 75.5g / L, the content of copper ion is 0.5g / L, sodium ion 25g / L, chloride ion 74.9 g / L solution, cobalt ion 0.15g / L, iron ion 0.35g / L. FeS is a new ecological FeS, which is 0.1M FeCl 2 The solution is mixed with 0.1M NaS solution, and after the precipitation occurs, the precipitation is added to the solution to be treated in proportion within half an hour.
[0052] First, the nickel electrolytic anolyte was heated to 51 °C and NiCO 3 Adjust the pH value to 4.1, then add FeS according to the Fe / Ni molar ratio of 1.15, react for 15 minutes, separate the solution and precipitate, and obtain copper-removed slag and copper-removed liquid. The ratio of copper to nickel in the copper removal slag is 84, and the copper concentration in the liquid after copper removal is 2.3mg / L.
[0053] NiCO 3 Adjust the pH value to 5.4, and then pass chlorin...
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