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Method for recovery of selenium from copper anode mud

A copper anode slime and selenium recovery technology, applied in the field of metallurgical technology, can solve the problems of large energy consumption, large environmental pollution, and dispersion of valence metals, and achieve the effect of reducing recycling costs and reducing emissions

Inactive Publication Date: 2017-02-08
ZHEJIANG YADONG IND CO LTD
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Problems solved by technology

The traditional fire treatment process produces harmful gases, which has the disadvantages of large environmental pollution, large energy consumption, and the dispersion of valuable metals.

Method used

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Embodiment Construction

[0012] The present invention will be further described below in combination with specific embodiments.

[0013] A method for reclaiming selenium from copper anode slime, comprising the following steps from a to c:

[0014] a. Gasification: add sulfuric acid to the copper anode slime containing impurities for acid leaching, and then roast the pre-sulfated copper anode slime. The roasting adopts the indirect heating method of the horse boiling furnace. The elemental selenium in the copper anode slime fully reacts with sulfuric acid to form Gaseous selenium dioxide and sulfur dioxide, control the copper anode slime and 98% concentrated sulfuric acid according to the solid-liquid mass ratio of 1:0.7 to 1:1, preferably 1:0.8, control the heating and roasting temperature to 500°C to 600°C, and the roasting time to 7h ~8h, copper anode slime and 98% concentrated sulfuric acid are roasted in a muffle furnace, and the following reactions are mainly produced:

[0015] Se+2H 2 SO 4 ==...

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Abstract

The invention discloses a method for recovery of selenium from copper anode mud. The method consists of: pre-sulfating copper anode mud containing impurities, then performing roasting to generate gaseous selenium dioxide and sulfur dioxide, sending the mixed gas of selenium dioxide and sulfur dioxide into a lead absorption tower through a pipeline so as to obtain a part of elemental selenium and a part of seleninic acid, recovering absorption liquid with residual seleninic acid into a vacuum circulation jet pump barrel filled with excessive sulfur dioxide, and performing reduction to obtain elemental selenium. The method increases the recovery rate of selenium in copper anode mud from 90%-95% of the conventional process to 99.5% or more, lowers the selenium recovery cost, alleviates the environmental protection pressure, and reduces emission of sulfur dioxide.

Description

technical field [0001] The invention belongs to the technical field of metallurgical technology, and in particular relates to a method for recovering selenium from copper anode slime. Background technique [0002] Selenium rarely exists in the form of independent deposits, and its mineral sources mainly come from bornite and copper pyrite. At present, the raw materials for extracting selenium in the nonferrous metallurgical industry are mainly anode slime produced by electrolysis, and the first one is copper electrolysis anode slime. Copper anode slime is a by-product produced during the copper electrolytic refining process. When blister copper is electrolyzed, most of the selenium in blister copper is transferred to copper anode slime. The existing form of selenium in copper anode slime is mainly composed of silver selenide, copper selenide, and copper-silver-selenide compound. Since copper anode slime contains a large amount of precious metals and rare elements, reasona...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/02
CPCC01B19/02
Inventor 王建潮王立明金伟霍东钟寅丽
Owner ZHEJIANG YADONG IND CO LTD
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