本文選題：銅陽極泥 + 浸出液��； 參考：《中國有色金屬學(xué)報》2017年10期

【摘要】：銅陽極泥經(jīng)低溫堿性熔煉-浸出處理后,鉛、砷、硒等進入強堿性浸出液,其中鉛和砷分別以Pb(OH)_n~(2-n)和AsO_4~(3-)形式存在。為分離其中的鉛、砷等主要雜質(zhì)元素,通過計算PbS-H_2O體系電勢-pH圖、Ca-As-H_2O體系溶解平衡濃度-pH圖后,采用硫化沉淀和鈣鹽沉淀的方式有效去除鉛、砷,同時保證硒的低分散度。實驗結(jié)果表明:采用硫化沉淀,硫化鈉過量系數(shù)2.5,反應(yīng)溫度20℃,反應(yīng)時間15 min。在此條件下,鉛和銅沉淀率都達到99.99%以上,硒損失5%;采用鈣鹽沉淀,控制溶液pH=10,鈣砷比3.5,反應(yīng)溫度90℃,反應(yīng)時間1.5 h。在此條件下,砷沉淀率達到99%以上,硒沉淀率為2.81%。
[Abstract]:After low temperature alkaline smelting and leaching of copper anode slime, lead, arsenic and selenium enter into strong alkaline leaching solution. Lead and arsenic exist in the form of Pb (OH) n2-n and AsO43- respectively. In order to separate the main impurity elements such as lead and arsenic in PbS-H2O system, after calculating the potential-pH diagram of PbS-H2O system and the solution equilibrium concentration -pH diagram of Ca-As-H2O system, lead and arsenic were effectively removed by sulphide precipitation and calcium salt precipitation, and the low dispersion of selenium was ensured at the same time. The experimental results show that the reaction temperature is 20 鈩，

本文編號：2110065