(中南大学 冶金科学与工程学院，长沙 410083)
摘 要: 对铜电解液脱砷方法进行研究，提出以二段脱铜液为原料，采用SO2还原结晶法脱砷新工艺。在二段脱铜液中通入SO2，将其中的As(Ⅴ)还原成As(Ⅲ)，还原后的溶液通过蒸发结晶析出As2O3，达到二段脱铜液脱砷的目的。结果表明：当As(Ⅴ)浓度为12.41 g/L、H2SO4浓度为253.00 g/L、反应温度为60 ℃时，向二段脱铜液中通入SO2 90 min后静置90 min，二段脱铜液中As(Ⅴ)的还原率达到94.54%。还原后的溶液进行蒸发结晶，当蒸发前与结晶后的体积比(V0:V1)为3.5时，砷的脱除率达到91.33%，结晶产物为As2O3。与传统脱砷工艺相比，新工艺具有操作简单、成本低廉及砷的脱除效果明显等优势。
关键字: 二段脱铜液；砷；还原；结晶
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The process of arsenic removal from copper electrolyte was studied. A new process for the removal of arsenic from the second stage decopperizing electrolyte by reducing with SO2, and the following crystallization was proposed. As (Ⅴ) in the second stage decopperizing electrolyte was reduced to As (Ⅲ) with SO2. As2O3 was produced from the reduced solution by the evaporation and crystallization. The purpose of arsenic removal from the second stage decopperizing electrolyte was achieved in the experimental. The results show that the reduction rate of As(Ⅴ) reaches 94.54% under the conditions of As(Ⅴ) concentration of 12.41 g/L, H2SO4 concentration of 253.00 g/L, reaction temperature of 60 ℃, the aeration time of SO2 of 90 min and standing time of 90 min. The removal rate of arsenic is 91.33% when the volume ratio of the reduced solution to the crystallized solution is 3.5. The crystallized products are As2O3. Compared with the conventional process of the arsenic removal from copper electrolyte, the new process has the advantages of simple operation, low cost and high removal rate of arsenic.
Key words: second stage decopperizing electrolyte; arsenic; reduction; crystallization
