对国内某电解锰厂含铅量高的阳极渣进行了回收锰的实验研究.实验采用葡萄糖作还原剂在硫酸体系中还原浸出电解锰阳极渣.通过基于中心复合设计的响应曲面法对浸出温度、硫酸用量和葡萄糖用量的工艺参数进行研究并优化.研究表明:温度对锰浸出率的影响最显著,葡萄糖的次之,硫酸的最小;硫酸对铅浸出率影响最显著,温度的次之,而葡萄糖则几乎没有影响.在浸出温度80℃,葡萄糖与锰阳极渣质量比为0.175:1、酸渣质量比为0.8:1的条件下,锰的浸出率可达93.22%,铅的浸出率仅为0.39%,锰、铅分离效果明显,锰阳极渣浸出前后的物相通过X射线衍射仪进行表征.实验证明:在硫酸体系中利用葡萄糖还原浸出电解锰阳极渣的方法是可行的.
@@@@The present study was carried out for the recovery of manganese by using lead-rich manganese anode slag from electrolytic manganese plant. Glucose and sulfuric acid were used as reductant and leaching solvent for reductive leaching of manganese anode slag. The effect of important parameters, such as temperature, sulfuric acid and glucose concentration, was investigated and the process conditions were optimized using response surface methodology (RSM) based on central composite design (CCD). The results show that the effect of temperature on the manganese leaching yield is the most significant, the effect of glucose concentration is second, and the effect of sulfuric acid concentration is minimum. At the meantime, the effect of sulfuric acid concentration on the lead leaching yield is the most significant, followed by the effect of temperature, while glucose almost has no effect. The leaching yield of Mn reaches 93.22%, while the extraction of Pb is only 0.39%under the conditions of leaching temperature 80℃, the mass ratio of glucose to slag 0.175:1 and the mass ratio of acid to material 0.8:1. The samples were characterized before and after leaching using X-ray diffraction (XRD). The results show that manganese is extracted from anode slag in sulfuric acid using the glucose as reductant proved highly effective.
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