(昆明理工大學 冶金與能源工程學院，昆明 650093)
摘 要: 鋅冶煉浸出渣中鋅主要以鐵酸鋅的形式存在，針對鋅浸渣中鐵酸鋅難于分解的問題，以鐵酸鋅作為研究對象，研究二氧化硫作用下鐵酸鋅中鋅的溶出和Fe(Ⅲ)的還原行為。考察初始硫酸濃度、液固比、二氧化硫通入量、反應時間、反應溫度對二氧化硫還原分解鐵酸鋅行為的影響。結果表明：最佳反應條件如下，初始硫酸濃度120 g/L、液固比11:1、二氧化硫通入量0.41×10-2 mol/g、反應時間120 min、反應溫度105 ℃。在最佳反應條件下，對鋅浸渣開展還原浸出實驗，鋅的浸出率能達到99%以上，F(xiàn)e(Ⅲ)的還原率能達到98%。通過ICP-MS和XRD分析表明，鋅浸渣中的鐵酸鋅完全分解，還原浸出渣的主要成分為鋅和鉛，分別以ZnS和PbSO4的形式存在。
關鍵字: 鐵酸鋅；鋅浸渣；二氧化硫；浸出
（Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China）
Abstract:The zinc in zinc residues exists mainly as zinc ferrite, in order to solve the difficulty of decompose zinc ferrite in zinc residues, by taking a zinc ferrite as the research object, the dissolution of zinc and the reduction of Fe(Ⅲ) in zinc ferrite under the action of sulfur dioxide were investigated. The effects of initial sulfuric acid concentration, liquid solid ratio, sulfur dioxide content, reaction time and reaction temperature on the reductive decomposition of zinc ferrite were studied when sulfur dioxide was used as reductant. The results show that the optimal reaction condition are as follows: sulfuric acid concentration of 120 g/L, liquid-solid ratio of 11:1, SO2 intake of 0.41×10-2 mol/g , reaction time of 120 min and reaction temperature of 105 ℃. The leaching rate of zinc is as high as 99% and the reduction rate of Fe(Ⅲ) is 98% under the optimum reaction conditions. Furthermore, the zinc ferrite is fully decomposed, and the main compositions of the residue are ZnS and PbSO4, according to the ICP-MS and XRD analysis.
Key words: zinc ferrite; zinc residues; sulfur dioxide; leaching
