低酸浸出液两次沉铜工艺研究OA

Addressing the issues of a copper precipitation rate of only 80%and the difficulty in recycling residual copper in the single-step iron powder-assisted copper precipitation and dechlorination process,this paper proposes a two-step copper precipitation process involving"iron powder-assisted copper precipitation and dechlorination+zinc powder deep recovery of residual copper".The study focuses on the low-acid leachate obtained after neutralizing and reducing the acidity of the oxygen pressure leachate.It investigates the effects of the amount of iron powder added during the first copper precipitation and the amount of zinc powder added during the second copper precipitation on the precipitation of copper and chlorine in the low-acid leachate.The results indicate that in the low-acid leachate system,adding iron powder for the first time can precipitate most of the copper and chlorine in the solution.When the iron powder addition coefficient is 1.4,the copper precipitation rate of iron powder-assisted copper precipitation is 80.18%,and the chlorine removal rate is 40.47%,achieving preliminary copper recovery and effective chlorine removal.The second addition of zinc powder continues to react and precipitate with the residual copper.The zinc powder copper precipitation rate increases with the increase in the amount of zinc powder added.When the zinc powder addition coefficient is 1.3,the copper precipitation rate can reach 96.14%,but the addition of zinc powder has little effect on chlorine removal.The copper precipitation rate in the two-step copper precipitation process is 17.04%higher than that in the single-step copper precipitation process,while the dechlorination rate remains essentially unchanged.The two-step copper precipitation process achieves maximum copper recovery and efficient chlorine removal by using iron powder and zinc powder as reducing agents in stages.