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  • 蔡海立,宁寻安,白晓燕,路星雯,李日文,沈雯.CaCl2氯化焙烧回收铁尾矿中的重金属Cu、Pb、Zn[J].环境工程学报,2019,13(9):2217-2224.DOI:10.12030/j.cjee.201812210    [点击复制]
  • CAI Haili,NING Xunan,BAI Xiaoyan,LU Xingwen,LI Riwen,SHEN Wen.Recovering Cu, Pb and Zn in iron tailings by chlorination roasting with CaCl2[J].,2019,13(9):2217-2224.DOI:10.12030/j.cjee.201812210   [点击复制]
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CaCl2氯化焙烧回收铁尾矿中的重金属Cu、Pb、Zn
蔡海立, 宁寻安, 白晓燕, 路星雯, 李日文, 沈雯
0
(广东工业大学环境科学与工程学院,环境健康与污染控制研究院,广州市环境催化与污染控制重点实验室,广州 510006)
摘要:
针对铁尾矿资源化利用问题,通过添加CaCl2对铁尾矿进行氯化焙烧。使用X射线衍射仪、热重分析法对CaCl2进行了分析,采用原子吸收光谱法、X射线荧光分析对焙烧渣和收集物进行了分析;探究了氮气和干空气条件下CaCl2的作用机理;研究了焙烧气氛和温度对铁尾矿中Cu、Pb、Zn的挥发效果的影响及不同方法对挥发物的收集效果。结果表明:在氮气条件下,CaCl2在反应后生成了CaClOH且释放Cl;在空气条件下,CaCl2分别与H2O和O2反应释放Cl;重金属Cu、Pb、Zn的挥发率次序为Pb>Cu>Zn,且随着温度的升高而增大;在氮气条件下,Pb的挥发效果优于干空气条件,Zn与之相反,而焙烧气氛对Cu的挥发效果影响较小;氮气条件下的烟气中重金属更易于被冷凝收集,干空气条件下的烟气中重金属更易于被湿法洗涤吸收。氯化焙烧处理后,铁尾矿中Cu、Pb、Zn均实现了很大程度的挥发。
关键词:  金属矿  铁尾矿  氯化焙烧  挥发率  重金属  固体废物
DOI:10.12030/j.cjee.201812210
投稿时间:2018-12-31
基金项目:2017年土壤中央专项资金(18HK0108)
Recovering Cu, Pb and Zn in iron tailings by chlorination roasting with CaCl2
CAI Haili, NING Xunan, BAI Xiaoyan, LU Xingwen, LI Riwen, SHEN Wen
(Guangzhou Key Laboratory Environmental Catalysis and Pollution Control, Institute of Environmental Health and Pollution Control, School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, China)
Abstract:
In view of the resource utilization of iron tailings, the iron tailings were chlorination roasted by adding CaCl2. X-ray diffraction analysis and thermogravimetric analysis were used to analyze CaCl2, and atomic absorption spectrometry and X-ray fluorescence were used to analyze the roasted slag and collected materials. The CaCl2 action mechanisms under nitrogen and dry air conditions were investigated, the effects of roasting atmosphere and temperature on the volatilization rates of Cu, Pb and Zn in iron tailings, as well as the effects of different collection methods on the collection rates were studied. The results show that the CaCl2 reaction could generate Ca(OH)Cl and release Cl in nitrogen atmosphere, while CaCl2 reacted with O2 or H2O to release Cl in the dry air. The order of heavy metal volatilization rates was Pb>Cu>Zn, and the rates increased with the increase of temperature. For Pb volatile effect, nitrogen atmosphere was better than air atmosphere, which was contrary for Zn volatile effect, while roasting atmosphere has little influence on Cu volatile effect. In nitrogen atmosphere, the heavy metals in the flue gas were more easy to be collected by condensation, while in the circumstance of dry air, the heavy metals in the flue gas were more easy to be recovered by wet-washing and absorption. After chlorinated roasting, large part of Cu, Pb and Zn in iron tailings volatilized.
Key words:  metal ore  iron tailings  chlorination roasting  volatilization rate  heavy metal  solid waste