Efficient and comprehensive extraction of multiple heavy metals from high-arsenic copper dross via stepwise phase transformation and supergravity separation

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-07-09 DOI:10.1016/j.seppur.2025.134289

Xiang Li, Jintao Gao, Xi Lan, Zhancheng Guo

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Abstract

The copper dross generated in the crude lead refining process contains a large number of heavy metals. In this study, a new method was proposed for efficient and comprehensive extraction of multiple heavy metals from high-arsenic copper dross via stepwise phase transformation and supergravity separation. The phase transformation of copper dross was researched, which demonstrated that the metal lead and lead-rich phases were transformed into liquid at 650 ℃ and the crude lead with a lead content up to 96.38 wt% was obtained by supergravity separation. Then, Cu₃As could be further separated out with the temperature increased to 700 ℃, and the residue was copper matte, both products had a high copper content of 68.74 wt% and 62.85 wt%. In addition, the arsenic in the copper dross was mainly enriched in Cu₃As, and the recovery rate was as high as 97.5 %. Hence, the copper dross could be divided into three products to be recovered separately via supergravity separation without addition and secondary pollution compared with the current mainstream processes. According to the above findings, a new process was further developed for green and efficient stepwise recovery of polymetallic resources in crude lead refining.

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多级相变超重力分离高效综合提取高砷铜渣中多种重金属

粗铅精炼过程中产生的铜渣中含有大量重金属。本研究提出了一种通过逐步相变和超重力分离从高砷铜渣中高效、综合提取多种重金属的新方法。对铜渣的相变进行了研究，结果表明：在650 ℃下，金属铅相和富铅相转化为液体，采用超重分离获得了铅含量高达96.38 wt%的粗铅。当温度升高到700 ℃时，Cu3As可以进一步分离，残渣为铜锍，两种产物的铜含量分别为68.74 wt%和62.85 wt%。铜渣中的砷主要富集在Cu3As中，回收率高达97.5 %。因此，与目前的主流工艺相比，铜渣可分为3个产品，通过超重分离分别回收，不添加杂质，不产生二次污染。在此基础上，进一步开发了粗铅炼制中多金属资源绿色高效分步回收的新工艺。

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来源期刊

Separation and Purification Technology 工程技术-工程：化工

CiteScore

14.00

自引率

12.80%

发文量

2347

审稿时长

43 days

期刊介绍： Separation and Purification Technology is a premier journal committed to sharing innovative methods for separation and purification in chemical and environmental engineering, encompassing both homogeneous solutions and heterogeneous mixtures. Our scope includes the separation and/or purification of liquids, vapors, and gases, as well as carbon capture and separation techniques. However, it's important to note that methods solely intended for analytical purposes are not within the scope of the journal. Additionally, disciplines such as soil science, polymer science, and metallurgy fall outside the purview of Separation and Purification Technology. Join us in advancing the field of separation and purification methods for sustainable solutions in chemical and environmental engineering.