电解锰渣无害化处理技术简

电解锰渣是湿法电解金属锰工艺产生的废渣，环境危害性大、治理难度大。为消除锰渣的污染性，实验研究了锰渣浸出液中污染物种类，并分别采用生石灰和氢氧化钠作处理剂，从成本、处理效果方面进行比较，确定处理剂以及最佳运行条件。得出结论：锰渣中主要污染物为锰和氨氮（分别超过相关标准453倍和26倍），选取生石灰做处理剂，处理后的锰渣，浸出液中锰离子和氨氮的减排量分别达到99%和97%以上，水溶性锰离子浓度低于5 mg/L、氨氮浓度低于25 mg/L，均达到《污水综合排放标准》（GB8978-1996）中的排放标准；反应时间30 h以上、避免雨淋、不通风、无日照为最佳反应条件。

Harmless treatment technology of manganese slag

Manganese slag sludge generated by the electrolytic production of manganese metal craft is harmful to the environment and difficult to dispose. To solve the problem, two treatment agents, lime and sodium hydroxide, were used and their treatment effects and processing effect were compared. Finally, the toxicity of the treated manganese slag leachate was studied and the optimum operating conditions were determined. The result is that the major pollutants in manganese slag are water-soluble manganese (453 times higher than the standard) and ammonia-nitrogen (26 times higher than the standard). By selecting quicklime as treatment agents, the concentrations of manganese ions and ammonia emission in the treated manganese slag leaching solution are reduced over 99% and 97%, respectively. The concentration of water-soluble manganese ion after treatment is below 5 mg/L; ammonia-nitrogen concentration is below 25 mg/L, which can both meet the Integrated Wastewater Discharge Standard (GB8978-1996). The reaction process over 30 hours in unventilated and dark environment without rain is the optimum treatment condition.