【作者】 李辕成； 闵小波； 柴立元； 梁彦杰； 雷杰；

【Author】 Yuan-Cheng Li;Xiao-Bo Min;Li-Yuan Chai;Yan-Jie Liang;Jie Lei;Institute of Environmental Science & Engineering, School of Metallurgy and Environment, Central South University;Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution;

【机构】 中南大学冶金与环境学院； 国家重金属污染防治工程技术研究中心；

【摘要】 有色冶炼厂普遍采用石灰法进行污酸处理,该过程产生了大量含砷及重金属离子污泥。对于这种环境危害性大的污泥,固化是一种良好的无害化处理途径。以石灰石,水泥熟料为固化剂,并用水淬渣协同固化含砷污泥。利用正交实验对含砷污泥进行固化处理。利用XRD、XRF、SEM、强度测试与毒性浸出试验研究了不同比例固化剂对污泥固化效果的影响。结果表明,协同固化技术对于固化后样品浸出毒性影响作用显著,且固化样品强度最高,其浸出毒性最低,能达到国家标准(GB5085.3-2007)。更多还原

【Abstract】 Wastewater treatment sludge from a non-ferrous smelter is characterized as hazardous waste that requires treatment prior to disposal due to its significant contents of arsenic and heavy metals. It is composed mainly of CaSO₄·x H₂O with a high water content（>40%）. These heavy metals exist as hydrate, sulfate, arsenate, arsenite and other compounds. Some of them are not stable and will leak out during soil and water transportation. This sludge is highly detrimental to the eco-environment. The solidification process is one of the promising harmless treatments for this sludge. This study presented the stabilization of arsenic sludge, with the slag based curing agent, which is composed by smelting slag, cement clinker and limestone. The orthogonal experimental design was applied to optimize ratio. In combination with XRD, XRF,SEM,compressive strength and leaching toxicity tests, the effect of different ratios on the sludge solidification was studied. The results showed that curing agent had a significant influence on the compressive strength and leaching toxicity. The solidified sample showed the lowest leaching toxicity due to its stable structure. The leaching toxicity value of As was 0.76 mg/L, which was lower than that of China standardization（GB5085.3-2007）（5 mg/L）. The arsenic sludge from the non-ferrous metallurgy plant can be blended with cement clinker and smelting slag materials for brick manufacturing and hence be recycled as construction materials.更多还原