含锰冶炼粉尘的加压硫酸浸出

Pressure Leaching of Manganese-containing Dust from Smelting with Sulfuric Acid

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5mL/g,初始硫酸浓度120g/L,浸出温度120℃,体系压力0.8MPa,锰收尘灰/硫铁矿质量比1:0.5,浸出时间2h,搅拌转速500r/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.

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 of500 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.