(中南大學(xué) 冶金科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 對銅電解液脫砷方法進(jìn)行研究，提出以二段脫銅液為原料，采用SO2還原結(jié)晶法脫砷新工藝。在二段脫銅液中通入SO2，將其中的As(Ⅴ)還原成As(Ⅲ)，還原后的溶液通過蒸發(fā)結(jié)晶析出As2O3，達(dá)到二段脫銅液脫砷的目的。結(jié)果表明：當(dāng)As(Ⅴ)濃度為12.41 g/L、H2SO4濃度為253.00 g/L、反應(yīng)溫度為60 ℃時(shí)，向二段脫銅液中通入SO2 90 min后靜置90 min，二段脫銅液中As(Ⅴ)的還原率達(dá)到94.54%。還原后的溶液進(jìn)行蒸發(fā)結(jié)晶，當(dāng)蒸發(fā)前與結(jié)晶后的體積比(V0:V1)為3.5時(shí)，砷的脫除率達(dá)到91.33%，結(jié)晶產(chǎn)物為As2O3。與傳統(tǒng)脫砷工藝相比，新工藝具有操作簡單、成本低廉及砷的脫除效果明顯等優(yōu)勢。
關(guān)鍵字: 二段脫銅液；砷；還原；結(jié)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
