Method for recycling copper from acid waste etching solution
A technology for recovering copper from waste etching solution, applied in the field of copper recovery, can solve the problems of low copper extraction rate, high copper content in mother liquor, easy generation of chlorine gas, etc., and achieves the effects of good separation effect, low oxygen content and simple process
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Embodiment 1
[0014] A certain acidic waste etching solution, in which H + The concentration is 0.012mol / L, copper ion 120g / L and chloride ion; the organic phase of 1%Lix84-I, 14%N235 and 85% kerosene and the acidic waste etching solution are extracted in a volume ratio of 10:1 in three stages, and the extraction After the analysis, the concentration of copper in the waste water was measured to be 3g / L, and the extraction rate of copper was calculated to be 97.5%; then the loaded organic phase and pure water were washed in three stages at a volume ratio of 10:1. After washing, the loaded organic phase and the containing The copper sulfate solution with sulfuric acid 131g / L and copper ion 6g / L is 10:1 by volume and compared with the secondary stripping. After stripping, the organic phase is returned for reuse, and the water phase is copper sulfate solution with a current density of 55A / m 2 Electrolytic copper was obtained by electrodeposition on stainless steel 316 cathode. The purity of ele...
Embodiment 2
[0016] A certain acidic waste etching solution, in which H + The concentration is 1.0mol / L, copper ion 140g / L and chloride ion; 10% Lix973, 10% N263 extractant and 80% 200 # The organic phase of solvent oil and the acidic waste etching solution are extracted in a volume ratio of 30:1. After the extraction, the copper concentration in the waste water is analyzed and measured to be 2.8g / L.
[0017] The copper extraction rate is calculated to be 98%; then the loaded organic phase and pure water are washed in a volume ratio of 5:1 for secondary washing. After washing, the loaded organic phase is mixed with copper sulfate containing 240g / L sulfuric acid and 9g / L copper ions The volume ratio of the solution is 5:1 compared with the secondary stripping. After the stripping, the organic phase is returned for reuse, and the aqueous phase is a copper sulfate solution. At a current density of 220A / m 2 Under the following conditions, stainless steel 304 cathode electrodeposited to obtain...
Embodiment 3
[0019] A certain acidic waste etching solution, in which H + The concentration is 2.9mol / L, copper ion 100g / L and chloride ion; the organic phase of 4.3% Lix984, 0.7% N235 extractant and 95% kerosene and the acidic waste etching solution are extracted in a volume ratio of 20:1. After the analysis, the concentration of copper in the waste water was measured to be 1g / L, and the extraction rate of copper was calculated to be 99%; then the loaded organic phase and pure water were washed in a volume ratio of 0.2:1, and after washing, the loaded organic phase and the containing The copper sulfate solution of sulfuric acid 220g / L and copper ion 20g / L is 5:1 in volume ratio compared with the secondary stripping. After stripping, the organic phase is returned for reuse, and the water phase is copper sulfate solution. m 2 Under the following conditions, electrolytic copper is obtained by cathodic electrodeposition of metal titanium plates, and the purity of electrolytic copper is 99.96...
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