Simultaneous Acid Pressure Leaching of Silver-bearing Low-grade Manganese Ore and Sphalerite Concentrate

Lab-scale simultaneous acid pressure leaching of sphalerite concentrate and silver-bearing low-grade manganese ore was performed under various conditions to investigate leaching variables,such as leaching temperature,leaching duration,oxygen partial pressure and stirring rate.Such experiments were carried out in a 2 liter autoclave.Experimental results show that sphalerite concentrate and silver-bearing low-grade manganese ore help each other to leach in the simultaneous leaching experiments,but the coupling effect occurs obviously only under given leaching conditions.In this work some leaching mechanisms were proved in the experiments.For the sake of subsequent scale-up experiment,the reasonable conditions of simultaneous leaching are given as follows: leaching temperature,135℃;leaching duration,2h;oxygen partial pressure,0.6MPa;sulfuric acid usage,1.2.