Method of separating arsenic from copper slag through cooperation of high-arsenic material

Abstract

The invention discloses a method of separating arsenic from copper slag through cooperation of a high-arsenic material. The method comprises the steps of taking a mixed material of pyrite and arsenicsulfide slag as an arsenic remover, mixing the arsenic remover and copper slag evenly, and heating the mixture under an inert atmosphere at the temperature rising rate of 1-5 DEG C / min to 1100-1300 DEG C to be subjected to roasting to obtain mixed gas containing arsenic oxide and arsenic sulfide; introducing the air into the mixed gas to have a reaction at 800-900 DEG C to be oxidized to generatearsenic trioxide and sulfur dioxide; and finally conducting condensing to obtain an arsenic trioxide product. According to the method, the mixed material of pyrite and arsenic sulfide sliding groove serves as the arsenic remover and can destroy an arsenious vitreous body structure with high chemical stability in the copper slag, and arsenic is reduced into arsenic oxide and arsenic sulfide to be released; the problem that arsenic and copper slag in high-arsenic copper slag are hard to separate during actual production is solved; and the purposes of efficiently volatilize and directionally collecting arsenic and using waste to treat waste are achieved.

Description

technical field [0001] The invention belongs to the technical field of pyrometallurgy, and relates to a method for separating arsenic from copper slag with high-arsenic materials, using a mixture of pyrite and arsenic sulfide slag as a de-arsenic agent to improve the arsenic removal rate of high-arsenic copper slag, and realize the separation of slag Harmless treatment and resource utilization. Background technique [0002] It is estimated that the annual output of copper slag in my country exceeds 20 million tons. In the past, my country usually regarded copper slag as useless waste and discarded it in the waste slag yard. At present, the cumulative accumulation of copper slag has exceeded 100 million tons. However, in recent years, due to the increasing number of complex and difficult-to-handle materials, high-arsenic complex copper concentrates have entered the copper smelting system, and the arsenic content in copper slag has gradually increased. Using traditional meth...

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Problems solved by technology

[0008] Aiming at the problem that the combination of arsenic and minerals in the existing high-arsenic copper slag makes it difficult to remove directly, the purpose of the present invention is to provide a method for separating arsenic in copper slag with high-arsenic materials, using pyrite and arsenic sulfide slag The mixed material is used as an arsenic removal agent. In an inert atmosphere, when the temperature reaches above 800°C, the sulfur-based reducing substances produced by the decomposition of arsenic sulfide will react with pyrite through oxygen capture, and the chemical stability of the joint destruction copper slag is high. The arsenic-containing vitreous structure promotes the reduction and volatilization reaction of arsenic after it is released by the vitreous network structure, and the arsenic is reduced to arsenic trioxide and arsenic sulfide, and then oxidized to obtain high-purity arsenic oxide products, which solves the problem of arsenic and arsenic in high-arsenic copper slag in actual production. The problem of difficult separation of copper slag, realize the efficient volatilization and directional collection of arsenic, and achieve the purpose of treating waste with waste

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