堆存锰渣中重金属污染物性质及固化研究

Study on the Properties and Solidification of Heavy Metal Pollutants in Stockpiling Manganese Slag

为了解决锰渣的无害化处理,对某堆存锰渣进行了全量、形态和固化分析。结果表明:堆存锰渣中含有大量重金属污染物,且大部分污染物的可溶性形态占比较高,其中全Mn含量超过相关标准限值,浸出液中Mn^(2+)、Ni^(2+)浓度超过排放限值。选用石灰石作为固化剂对堆存锰渣进行固化后,浸出液中Mn^(2+)、Ni^(2+)的含量显著下降,当其加入质量分数为2%时,浸出液中Ni^(2+)的浓度达到排放标准要求,增至6%后Mn^(2+)浓度达标;固化后堆存锰渣中污染物的可溶性形态占比明显降低,残渣态占比升高,污染物活性显著下降,表明石灰石对堆存锰渣无害化处理有较好的效果。

In order to solve the problem of harmless treatment of manganese slag,a component,morphological,and solidification analysis was conducted on the stockpiling manganese slag.The results show that the stockpiling manganese slag contains a large amount of heavy metal pollutants,and most of the pollutants have a high proportion of soluble forms.The total Mn content exceeds the relevant standard limits,and the concentrations of Mn^(2+)and Ni^(2+)in the leachate exceed the emission limits;Using limestone as a solidifying agent to solidify stockpiling manganese slag,the content of Mn^(2+)and Ni^(2+)in the leachate significantly decreased.When a mass fraction of 2%was added,the concentration of Ni^(2+)in the leachate met the emission standard requirements.After increasing to 6%,the concentration of Mn^(2+)met the standard;After solidification,the proportion of soluble forms of pollutants in the stockpiling manganese slag significantly decreases,the proportion of insoluble forms increases,and the activity of pollutants significantly decreases,indicating that limestone has a good effect on the harmless treatment of stockpiling manganese slag.