作　　者： (陈红亮）; (张玉涛）; (张秋云）; (李琳）;

机构地区： 安顺学院贵州省科技厅土壤污染控制与修复工程技术中心,安顺561000 安顺学院化学化工学院,安顺561000

出　　处： 《硅酸盐通报》 2017年第8期2844-2849,共6页

摘　　要： 研究酸法还原浸出电解锰渣中锰、铁的影响因素和动力学机制,并初步分析了反应机理。结果表明:增加反应温度、浸出时间均有助于锰、铁浸出率的提高。在85℃、4 mL/g液固比、1.67 mol/L H_2SO_4、0.2 mol/L H_2C_2O_4、120 min浸出时间的条件下,锰、铁浸出率分别为99.9%和79.3%。反应机理为电解锰渣中难溶物Mn_2O_3、CaMn_2O_4、Fe(OH)_3在酸性溶液中与H_2C_2O_4发生还原反应形成易溶组分。锰、铁的浸出过程符合内扩散控制模型,表观活化能分别为21.6 kJ/mol和17.9 kJ/mol。 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,Ca Mn2O4 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.

关 键 词： 电解锰渣 酸法还原浸出 动力学机制 矿物相