铜渣与含砷污酸反应行为及除砷机理

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Abstract

On the basis of composition and phase characteristics of copper slag, the reaction behavior of copper slag with arsenic-containing waste acid and the rule of arsenic removal were investigated, and the reaction kinetics of arsenic removal was also elucidated. Under optimal conditions, including a copper slag dosage of 0.2g/mL, a reaction temperature at 23℃, and a reaction time of 24hours, a maximum adsorption capacity of copper slag of 25.89mg/g was achieved, following by an arsenic removal efficiency of 99.56%. The leaching toxicity of arsenic-fixed copper slag was lower than 5mg/L that is the standard threshold value of hazardous waste. The arsenic-fixed copper slag could be classified as a general solid waste. The kinetic studies revealed that the arsenic adsorption on the copper slag was described by a pseudo-second-order kinetic equation. The process of arsenic removal was limited by the release rate of iron ion. Arsenic was removed via the ion exchange adsorption and the chemical precipitation, which were also beneficial to the arsenic stabilization. A large number of iron ions were released during the solid-liquid reaction between copper slag and waste acid, which could precipitate arsenic via the ion exchange adsorption and the chemical precipitation, forming relative stable arsenates and their derivatives for the arsenic removal. The copper slag exhibits a superior performance for the arsenic removal from waste acid and provides a high-efficient and low-cost method for the disposal of waste acid from heavy non-ferrous smelting industry.

Key words： copper slag arsenic-containing waste acid arsenic removal kinetics

Received: 29 March 2019

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X705

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	Articles by authors
	LI Yong-kui
	ZHU Xing
	QI Xian-jin
	WANG Hua
	ZHANG Xin
	HUI Xing-huan
	HAO Feng-yan
	CAI Gui-yuan

Cite this article:

LI Yong-kui,ZHU Xing,QI Xian-jin等. Reaction behavior of copper slag with waste acid and its arsenic removal mechanism[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(10): 4228-4238.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I10/4228

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