Abstract:In the process of leaching-extraction-back-stripping electrodeposition, the copper remaining in the raffinate has a high recovery value. Because of the shortcomings of existing studies in the analysis of mechanism and product morphology, the study on the recovery of copper from high iron and low copper raffinate by replacement was carried out in this paper. The effect of time, temperature, feeding method, and amount of iron powder on the replacement effect was investigated systematically, and the efficient replacement recovery of copper was realized. The results show that when the amount of iron powder added at one time is 7 times the theoretical amount required for the complete reaction of Cu2+, the conversion rate of Cu2+ and Fe3+ is 99.96% and 95.86%, respectively, while the conversion rate of H+ is only 2.37% with the condition of mechanical stirring at 20℃ for 30min. By thermodynamic analysis of the experimental results, it is found that the priority and limit of the reaction are consistent with the thermodynamic calculation results. The morphology analysis of the product copper shows that the product sponge copper is mainly composed of two kinds of structures: spongy and spheroidal.