氯化剂对铁尾矿焙烧过程中重金属挥发的影响

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Abstract A chlorination roasting method was used for separating heavy metalsfrom iron tailings. The influence of chloride (i.e. CaCl₂, NaCl and AlCl₃∙6H₂O), content of chloride, and temperatures on the volatilization of heavy metals was studied. Experimental results showedthat when usingAlCl₃∙6H₂O as chloride, the volatilization ratios of heavy metals was lower than 30%, due to the prior decomposition of AlCl₃∙6H₂O at 135℃. With the addition of NaCl, the volatilization ratios of Pb, Zn, Cuachieved above 90%, but only 16.2% of Cr and30.0% of Ni were removed from tailings. The addition of CaCl₂ exhibitedthe best volatilization effect compared to NaCl and AlCl₃∙6H₂O.The hazardous Pb, Zn and Cu were reduced significantly (97.5% of Pb, 99.0% of Zn, 93.3% of Cu) at 900℃, and the maximum volatilization of Ni and Cr was 31.9% and 49.5% at 1000℃. Moreover, the leaching experiment showed the leaching concentration of Cr, Ni, Pb, Zn, Cu in roasted residue could meet the regulatory limit of leachate (GB16889-2008).

Key words： iron tailing heavy metal chlorination roasting volatilization thermogravimetric analysis

Received: 12 October 2019

PACS:

X131.2

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	Articles by authors
	HONG Yan-xiang
	NING Xun-an
	LU Xing-wen
	LI Yang
	LAI Xiao-jun
	ZENG Jun
	CHEN Chang-hong

Cite this article:

HONG Yan-xiang,NING Xun-an,LU Xing-wen等. Effect of chlorine on the volatilization of heavy metals by roasting iron tailings[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(5): 2276-2286.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I5/2276

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