废旧阴极-赤泥协同处理烧结熟料的溶出性能

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Abstract The digestion performance of roasted sample produced by co-treatment of spent pot-lining and red mud at high temperature were studied using XRF, ICP-MS, XRD and SEM-EDS. The experimental results showed that the influences of alkali concentration (Na₂CO₃), temperature, digestion duration and liquid-solid ratio on the digestion rates of Al₂O₃ and Na₂O and the enrichment of TFe₂O₃ were consistent. The optimal digestion conditions were below:Na₂CO₃ 30g/L, temperature 50℃, time 30min, liquid-solid ratio 8. Under these conditions, the digestion rates of Al₂O₃ and Na₂O in the roasted sample were 87.41% and 92.51% respectively; while only 3.02% of SiO₂ and 0.36% of CaO were digested, and iron minerals were almost indissoluble in alkaline solution. The content of TFe₂O₃ increased to 39.89% in the digested residue from 23.64% in the roasted sample. The results showed that the efficiently recovery of aluminum, sodium and the enrichment of iron from the roasted sample were achieved simultaneously by the digestion process. Moreover, compared with the roasted sample, the amount of digested residue was reduced by nearly 16% (evaluated based on the digestion rates of Al₂O₃ and Na₂O), and it was non-hazardous.

Key words： red mud co-treatment roasted sample digestion performance recovery

Received: 11 November 2019

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X705

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	Articles by authors
	LU Fang-hai
	ZHENG Kai
	SU Xiang-dong
	CHEN Xiao-hu
	HUANG Fang
	WANG Zhi-cheng
	GU Xiao-fei
	YAN Qing-song

Cite this article:

LU Fang-hai,ZHENG Kai,SU Xiang-dong等. Digestion performance of roasted sample produced by co-treatment of spent pot-lining and red mud[J]. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(7): 3037-3043.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2020/V40/I7/3037

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