高锰酸钾生产废渣中的高价锰回收方法研究
Study on recovery of high valent maganese from KMnO4 slag
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摘要: 高锰酸钾生产过程所产生的废渣中含有较多的高价态锰，导致锰资源的浪费和潜在的环境污染问题。采用葡萄糖硫酸还原浸取法浸取高锰酸钾渣中的高价锰，实验探讨了葡萄糖用量、硫酸用量及浸取温度等因素对锰浸取率的影响，并研究了化学氧化法回收二价锰的工艺条件。结果表明，在葡萄糖与高锰酸钾渣质量比为0.3、硫酸物质的量与高锰酸钾渣质量之比为0.02、温度为75℃条件下，浸取2 h，锰浸取率可达95%；将浸取出的二价锰经化学氧化可得到晶型单一且稳定的α-MnO2，能有效实现锰资源的回收利用。Abstract: Industrial residue from production of KMnO4 contains much high valence of Mn compounds. It leads to the waste of manganese and the risk of environmental pollution. To recycle the manganese in the slag， glucose was used as reductant in acidic solution. Factors associated with leaching rate were investigated such as dosage of glucose， concentration of sulphuric acid and leaching temperature. And the process conditions to recover the manganese by chemical oxidation method were studied. Results indicated that manganese in slag could be leached under the following conditions： 75℃ for 2 h， with mass ratio of glucose: slag 0.3， nH2SO4∶mslag=0.02， and the leaching rate of manganese was up to 95%. The Mn2+ in leaching water was oxidized to α-MnO2 by chemical route and the crystalline phase MnO2 was stable. It can effectively recycle the manganese in the slag.
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Key words:
- potassium permanganate slag /
- reduction leaching /
- manganese dioxide
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