铜冶炼烟气中含砷铜颗粒物的形成与硫酸盐化分解机理

来源期刊:中国有色金属学报(英文版)2021年第7期

论文作者:姚文明 闵小波 李青竹 李开中 王云燕 王庆伟 刘恢 曲胜利 董准勤 曲超 陈涛 宋超

文章页码:2153 - 2164

关键词:铜冶炼烟气;颗粒物;硫酸盐化分解;砷酸铜;黄铁矿

Key words:copper smelting flue gas; particles; sulfation decomposition; copper arsenate; pyrite

摘    要:铜冶炼余热回收锅炉中含有大量的砷铜颗粒物,其砷和铜的原位分离对环境风险控制和有价资源回收至关重要。模拟含砷铜颗粒物的形成,提出黄铁矿原位分解含砷铜颗粒物的新方法,并证实其分解机理。结果表明,在模拟余热锅炉中形成砷含量较高的颗粒物,且以砷酸铜物相为主。黄铁矿促进铜的硫酸盐化,导致砷酸铜的原位分解。在此过程中,砷以气态形式得以释放,从而实现颗粒物中砷和铜的分离。

Abstract: The heat recovery steam generator (HRSG) of copper smelting generates a large number of arsenic-copper- containing particles, and the in-situ separation of arsenic and copper is of importance for cutting off environmental risk and realizing resource recovery. The formation of arsenic-copper-containing particles was simulated, the method of in-situ decomposition of arsenic-copper-containing particles by pyrite was proposed, and the decomposition mechanism was confirmed. It was found that particles with high arsenic content were formed in the simulated HRSG, and copper arsenate was liable for the high arsenic content. Pyrite promoted the sulfation of copper, leading to the in-situ decomposition of copper arsenate. In this process, gaseous arsenic was released, and thus the separation of arsenic and copper was realized.

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