Abstract: The pressure leaching of manganese smelter dust with air as pressurized gas in a sulfuric acid medium was studied. Optimum operating parameters were established as follows: ratio of liquid to solid 5 mL/g, initial sulfuric acid concentration 120 g/L, leaching temperature 120℃, partial air pressure 0.8 MPa, mass ratio of manganese smelter dust to pyrite 1:0.5, leaching time 2 h, and agitation speed of 500 r/min. Under these conditions, the leaching rates of Mn and Fe are 96.1% and 7%, and the residual rate of final acid is about 34.9%. Manganese can be effectively separated from impurities such as iron in the leaching process. The pressure leaching technique of manganese smelter dust is further proved to be effective and stable.

Key words: manganese-containing smelter dust, pressure leaching, manganese, iron, final acid

摘要： 研究了含锰收尘灰加压浸出的影响因素. 结果表明，优化浸出工艺条件为：液固比5 mL/g，初始硫酸浓度120 g/L，浸出温度120℃，体系压力0.8 MPa，锰收尘灰/硫铁矿质量比1:0.5，浸出时间2 h，搅拌转速500 r/min. 在该条件下，Mn浸出率约96.1%，Fe浸出率仅7%左右，终酸残余率约34.9%. 该浸出工艺效果良好且稳定，Mn与其他杂质元素的分离效果良好，可取得常压浸出条件难以取得的理想浸出效果.

关键词: 含锰收尘灰, 加压浸, 锰, 铁, 终酸