(1. 昆明理工大學(xué) 冶金與能源工程學(xué)院，昆明 650093；
2. 昆明理工大學(xué) 省部共建復(fù)雜有色金屬資源清潔利用國家重點實驗室，昆明 650093)
摘 要: 采用鐵粉置換法處理濕法煉鋅產(chǎn)生的鋅浸渣還原浸出液，產(chǎn)出一種含砷銅渣，以該含砷銅渣為研究對象，利用氧壓酸浸緩慢分解含砷銅渣，使其中的銅、鋅等溶解進(jìn)入溶液，同時，砷、鐵以臭蔥石的形式沉淀為浸出渣，從而將銅的浸出和砷、鐵的沉淀在同一反應(yīng)釜同一過程中完成，有效實現(xiàn)含砷銅渣中有價金屬的浸出過程與雜質(zhì)的沉淀過程在同一過程同步進(jìn)行。結(jié)果表明：在反應(yīng)溫度為135 ℃、反應(yīng)時間為4 h、液固體積質(zhì)量比25 mL/g、硫酸濃度為50 g/L、氧分壓500 kPa、鐵砷摩爾比為1的條件下，浸出渣中銅含量僅為2.03%，浸出率達(dá)到97.72%，砷含量達(dá)到26.06%，沉淀率達(dá)到95.98%；浸出液中銅的濃度達(dá)到20.47 g/L，砷濃度小于0.63 g/L，實現(xiàn)了銅和砷的高效分離，提高了銅金屬回收率和資源綜合利用率。浸出渣中砷均以臭蔥石(FeAsO4？2H2O)的形式存在，符合當(dāng)前的環(huán)境友好型發(fā)展理念。
關(guān)鍵字: 濕法煉鋅；氧壓浸出；銅砷渣；銅砷分離
（1. Faculty of Metallurgy and Energy Engineering, Kunming University of Technology, Kunming 650093, China;
2. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, China）
Abstract:The reduction leaching solution of zinc leaching residue from zinc hydrometallurgy uses the iron powder replacement method to produce an arsenic containing copper residue. Taking the arsenic containing copper residue as the research object, the oxygen pressure acid leaching was used to slowly decompose the arsenic containing copper residue, so that the copper and zinc were dissolved into the solution. At the same time, the arsenic and iron were precipitated in the form of smectite as the leaching residue, so leaching copper and fixating arsenic iron precipitation is completed in the same process in the same reactor, effectively realizing that the leaching process of valuable metals in arsenic containing copper residue and the precipitation process of impurities were carried out simultaneously in the same process. The results show that, under the conditions of reaction temperature 135 ℃, reaction time 4 h, liquid-solid ratio 25 mL/g, sulfuric acid concentration 50 g/L, oxygen partial pressure 500 kPa and iron arsenic molar ratio 1, in the leaching residue, the copper content is only 2.03%, the leaching rate of Cu is 97.72%, the arsenic content is 26.06% and the precipitation rate of As is 95.98%. The concentration of Cu in the leaching solution reaches 20.47 g/L and the concentration of As is less than 0.63 g/L, which realizes the efficient separation of Cu and As and improves the metal recovery and comprehensive utilization of resources. Arsenic in leaching residue exists in the form of FeSO4？2H2O, which is in line with the current concept of environment-friendly development.
Key words: zinc hydrometallurgy; oxygen pressure leaching; copper arsenic precipitation; copper arsenic separation
