关键词: 电解锰渣;酸法还原浸出;动力学机制;矿物相

Abstract: Influential factors, kinetics mechanism and simple reaction theory of manganese and iron ions leaching from electrolytic manganese residue (EMR) by acid reduction were studied.Results show that the leaching ratios of manganese and iron ions are raised by increasing reaction temperature and leaching time.The leaching ratios of manganese and iron ions reach respectively 99.9％ and 79.3％ under the optimum conditions of 85 ℃, liquid-solid ratio of 4 mL/g, H2SO4 concentration of 1.67 mol/L, H2C2O4 concentration of 0.2 mol/L and leaching time of 120 min.The reaction theory is that insoluble substances, Mn2O3, CaMn2O4 and Fe(OH)3 from the EMR, react with H2C2O4 by reduction to form easily dissolved components.The kinetics processes of manganese and iron ions leaching by acid reduction follow the internal diffusion-controlled mode.The apparent activation energies of manganese and iron ions leaching are determined to be 21.6 kJ/mol和17.9 kJ/mol, respectively.

Key words: electrolytic manganese residue;leaching of acid reduction;kinetics mechanism;mineral phase