油泥热解渣对铅渣中As、Zn、Pb和Cd的同步稳定化  

Simultaneous Stabilization of As,Zn,Pb and Cd in Lead Slag by Pyrolysis Residue of Oily Sludge

作　　者：杨慧芬[1] 郭松 张军军 孙启伟 周轶臣 李萱 赵彤 Yang Huifen;Guo Song;Zhang Junjun;Sun Qiwei;Zhou Yichen;Li Xuan;Zhao Tong(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing,China;Graduate School of China University of Geosciences(Beijing),Beijing,China;Institute of Multipurpose Utilization of Mineral Resources,CAGS,Chengdu,Sichuan,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]中国地质大学(北京)研究生院,北京100083 [3]中国地质科学院矿产综合利用研究所,四川成都610041

出　　处：《矿产综合利用》2022年第5期58-64,共7页Multipurpose Utilization of Mineral Resources

基　　金：国家重点研发计划项目课题(2019YFC1803503)。

摘　　要：针对云南省个旧市泗水庄片区铅冶炼渣As、Zn、Pb和Cd等重金属污染的问题,利用油泥热解渣对其进行稳定化处理以降低这些重金属的浸出毒性。热解渣是一种含有大量纳米FeS、Fe_(1-x)S、CaS等的炭质复合材料,具有稳定化铅渣中重金属的潜能。研究表明,铅渣中的重金属As、Zn、Pb和Cd可高效、同步吸附在热解渣表面,降低铅渣中这些重金属的浸出毒性。当热解渣用量为4%、液固比为10:100时,铅渣中As、Zn、Pb和Cd的浸出浓度可从0.7202、3.5120、0.3800和0.0456 mg/L分别降低至0.0714、0.1668、0.0262和0.0038 mg/L,低于地表水环境质量标准(GB 3838—2002)中Ⅳ级限值。铅渣中As、Zn、Pb和Cd浸出浓度的降低是因为铅渣中的As与热解渣表面的Ca^(2+)、Fe^(2+)反应就地生成了稳定的砷酸钙和砷酸亚铁,铅渣中Zn^(2+)、Pb^(2+)和Cd^(2+)与热解渣表面的S^(2-)反应就地生成了稳定的ZnS、PbS和CdS,从而提高了铅渣中As、Zn、Pb和Cd的稳定性。To address the problem of heavy metal contamination of lead smelting slag such as As,Zn,Pb and Cd in the Sishuizhuang area of Gejiu City,Yunnan Province,oily sludge pyrolysis residue was used to stabilize them to reduce the leaching toxicity of these heavy metals.The pyrolysis residue is a carbonaceous composite containing a large amount of nano-FeS,Fe_(1-x)S,CaS,etc.,which has the potential to stabilize the heavy metals in lead slag.It was shown that heavy metals As,Zn,Pb and Cd in lead slag could be efficiently and synchronously adsorbed on the surface of pyrolysis residue,reducing the leaching toxicity of these heavy metals in lead slag.When the weight ratio of pyrolysis residueis is 4%and liquid-solid ratio is 10:100,the leaching concentrations of As,Zn,Pb and Cd in the lead slag can be reduced from 0.7202,3.5120,0.3800 and 0.0456 mg/L to 0.0714,0.1668,0.0262 and 0.0038 mg/L,respectively,which are lower than the surface water environmental quality standards(GB 3838—2002)in theⅣlevel limit value.The reduction of leaching concentration of As,Zn,Pb and Cd in lead slag is due to the reaction of As in lead slag with Ca^(2+)and Fe^(2+) on the surface of pyrolysis slag to produce stable calcium arsenate and ferrous arsenate in situ,and the reaction of Zn^(2+),Pb^(2+) and Cd^(2+) in lead slag with S^(2-) on the surface of pyrolysis slag to produce stable ZnS,PbS and CdS in situ,which improves the stability of As,Zn,Pb and Cd in lead slag.

关 键 词：油泥热解渣 铅渣 重金属 浸出毒性 稳定化 

分 类 号：TD952[矿业工程—选矿] X751[环境科学与工程—环境工程]