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采用废茶叶在硫酸溶液中还原浸出加蓬和湘西氧化锰矿石,探索废茶叶用量、硫酸浓度、固液比、浸出温度和反应时间对浸出过程的影响。对加蓬氧化锰矿,优化的浸出条件为:氧化锰矿与废茶叶的质量比10:4、硫酸浓度2.5 mol/L、固液比7.5:1、浸出温度368 K、浸出时间8 h;在此条件下,加蓬氧化锰矿的浸出率几乎达100%。对于湘西氧化锰矿,优化浸出条件为:氧化锰矿与废茶叶的质量比10:1、硫酸浓度1.7 mol/L、液固比7.5:1、温度368 K、浸出时间8 h;在此条件下,锰的浸出率达到99.8%。氧化锰矿的还原浸出过程符合内扩散控制模型,加蓬和湘西氧化锰矿石的还原浸出反应表观活化能分别为38.2 kJ/mol和20.4 kJ/mol。采用X-射线衍射(XRD)和扫描电子显微镜(SEM)对浸出前、后的锰渣进行表征。
Waste tea was reduced and leached in the sulfuric acid solution in Gabon and western Hunan manganese oxide ore to explore the amount of waste tea, sulfuric acid concentration, solid-liquid ratio, leaching temperature and reaction time on the leaching process. For the Gabon oxide ore, the optimal leaching conditions are as follows: the mass ratio of manganese oxide to waste tea leaves is 10: 4, the concentration of sulfuric acid is 2.5 mol / L, the solid-liquid ratio is 7.5: 1, the leaching temperature is 368 K and the leaching time is 8 h. , Gabon manganese oxide leaching rate of almost 100%. For the manganese oxide ore in western Hunan province, the optimal leaching conditions were as follows: the mass ratio of manganese oxide to waste tea was 10: 1, the concentration of sulfuric acid was 1.7 mol / L, the ratio of liquid to solid was 7.5: 1, the temperature was 368 K and the leaching time was 8 h. Manganese leaching rate of 99.8%. The process of reduction and leaching of manganese oxide is in accordance with the internal diffusion control model, and the apparent activation energy of reduction and leaching reactions of Gabon and Xiangxi manganese oxide ore are 38.2 kJ / mol and 20.4 kJ / mol, respectively. The manganese residues before and after leaching were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM).