Facile manufacture of high-purity CuSO4 from waste Cu-containing paint residue using combined processes of H2SO4 leaching and extraction stripping

Abstract

Waste copper-containing paint residue (WCPR) represents a typical hazardous waste containing both toxic organic substances and toxic heavy metals, but there are few reports on the recycling of heavy metals. The recovery of Cu from WCPR by H2SO4 leaching–extraction–stripping has the advantages of eco-friendliness, simplicity of operation, and high value-added product. The results show that under the optimal conditions, the leaching rate of Cu in WCPR is 94.31% (18.02 g/L), while the extraction and stripping rates of Cu in the leaching solution are 99.46 and 95.32%, respectively. Due to the high concentration of Cu2+ with fewer impurities in the stripping solution, the stripping solution is heated, evaporated, cooled, and crystallized to successfully produce high-purity dark blue CuSO4 crystal, accomplishing the high-value recycling of Cu in WCPR. In addition, the leach residue of WCPR contains acrylic resin and SiO2, which can be used in cement kilns for incineration, thus realizing the overall recycling and utilization of WCPR. HIGHLIGHTS The process of Cu recovery from waste copper-containing paint residue was first proposed to regenerate CuSO4.; Using leaching–extraction–stripping to recover Cu has the advantages of eco-friendliness and high value-added product.; The stripping solution without impurities can be used directly to regenerate CuSO4.; The resulting residue with no environmental risk can be cement kiln incineration.; The process can eliminate Cu pollution and recover Cu resource.;

Keywords

• cu recycling
• h2so4 leaching
• hazardous waste
• mechanism
• regeneration of cuso4
• waste copper-containing paint residue