Effect of injection of different gases on removal of arsenic in form of dust from molten copper smelting slag prior to recovery process

Hong-yangWANG,RongZHU,KaiDONG,Si-qiZHANG,YunWANG,Xin-yiLAN

doi:10.1016/S1003-6326(23)66180-1

Transactions of Nonferrous Metals Society of China >

2023 , Vol. 33 >Issue 4: 1258 - 1270

DOI: https://doi.org/10.1016/S1003-6326(23)66180-1

Mining, Minerals Processing and Metallurgical Engineering

Effect of injection of different gases on removal of arsenic in form of dust from molten copper smelting slag prior to recovery process

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Hong-yang WANG^1,2, Rong ZHU^1,2, Kai DONG^1,2, Si-qi ZHANG³, Yun WANG⁴, Xin-yi LAN⁵

1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing100083, China;
2. Beijing Key Laboratory for Special Melting and Preparation of High-end Metal Materials, University of Science and Technology Beijing, Beijing100083, China;
3. School of Civil and Resources Engineering, University of Science and Technology Beijing, Beijing100083, China;
4. The China ENFI Engineering Co., Ltd., Beijing100038, China;
5. School of Automation and Electrical Engineering, University of Science and Technology Beijing, Beijing100083, China

Online published: 2023-04-25

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Abstract

In order to reduce the environmental risks caused by arsenic in copper smelting slag, a method of dearsenisation from molten slag based on gas injection was proposed. It was expected to enrich arsenic in the form of dust prior to copper recovery process. The effects of inert, oxidising, and reducing gas on the removal of arsenic from molten slag were compared. When CO₂ was injected, the removal of arsenic was mainly attributed to the oxidation of Cu–As inclusions and arsenic sulphide in the slag. Based on the injection of CO, the removal rate of arsenic reached more than 60%. Based on the injection of reducing gas, arsenic oxide in the FeO_x-SiO₂ slag was reduced and volatilised into the gas phase, resulting in the removal of arsenic. This study provides a reference with respect to the establishment of strategies for the mitigation of arsenic pollution caused by smelting slag.

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Hong-yangWANG,RongZHU,KaiDONG,Si-qiZHANG,YunWANG,Xin-yiLAN . Effect of injection of different gases on removal of arsenic in form of dust from molten copper smelting slag prior to recovery process[J]. Transactions of Nonferrous Metals Society of China, 2023 , 33(4) : 1258 -1270 . DOI: 10.1016/S1003-6326(23)66180-1

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