Separation behavior of copper and arsenic in acid leaching solution of copper smelting dust

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Abstract In order to solve the problem of separating arsenic from valuable metals in the acid leaching solution of copper dust, this paper adopts the method of pressure synthesis of scorodite to realize the efficient separation of Cu and As, and stable solidification of arsenic in the form of scorodite. The effects of temperature, total pressure and initial pH on the separation of Cu and As, and the synthesis of scorodite were studied under pressurized system. The results show that increasing the reaction temperature is beneficial to the separation of Cu and As and the synthesis of scorodite with good crystal shape, while the formation of jarosite at lower temperature affects the synthesis of scorodite and the separation of Cu and As. The higher the initial pH value is, the more easily Fe³⁺ in the system hydrolysis, which is not conducive to the synthesis of scorodite, and further affects the separation efficiency of Cu and As. The increase of total pressure is conducive to the separation of Cu and As, but not conducive to the stable solidification of scorodite. If the oxygen pressure is too high, the oxidation rate is accelerated, and the hydrothermal hydrolysis reaction of Fe³⁺ is easy to occur. The morphology of scorodite changes from biconical to agglomerate, which reduces its stability. Under the conditions of initial molar ratio of Fe to As of 1.2, initial pH of 0.4, reaction time of 2 h, initial concentration of copper ion of 9 g·L^-1, total pressure of 0.8 MPa and temperature of 160 ℃, the precipitation rates of As and Cu are 81.57% and 12.27%, respectively, and the separation coefficient of Cu and As is 76.88, which can effectively separate Cu and As. And the crystalline scorodite was obtained.

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	YUAN Song
	LI Minting
	WEI Chang
	SUN Xu
	LI Xingbin
	DENG Zhigan
	JIANG Ziwei

Keywords： copper-arsenic separation scorodite copper smelting dust leaching solution removal arsenic by pressure

Received 2021-09-15;

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YUAN Song, LI Minting, WEI Chang, SUN Xu, LI Xingbin, DENG Zhigan, JIANG Ziwei.Separation behavior of copper and arsenic in acid leaching solution of copper smelting dust[J] Chemcial Industry and Engineering, 2023,V40(4): 111-121

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