Selective separation of arsenic and antimony enabled by desolvation effect during distillation process: chlorine/oxygen affinity mechanism

IF 8.1 1区工程技术 Q1 ENGINEERING, CHEMICAL

Separation and Purification Technology Pub Date : 2025-01-27 DOI:10.1016/j.seppur.2025.131829

Junfeng Kong, Huazhen Cao, Wenhua Xu, Weilun Qian, Lining Yu, Anyang Tang, Zhengzheng Liu, Huibin Zhang, Guoqu Zheng

{"title":"Selective separation of arsenic and antimony enabled by desolvation effect during distillation process: chlorine/oxygen affinity mechanism","authors":"Junfeng Kong, Huazhen Cao, Wenhua Xu, Weilun Qian, Lining Yu, Anyang Tang, Zhengzheng Liu, Huibin Zhang, Guoqu Zheng","doi":"10.1016/j.seppur.2025.131829","DOIUrl":null,"url":null,"abstract":"The depth-separation of arsenic from antimony is crucial for achieving high-purity antimony metal. Chlorinated distillation has shown to effectively lower arsenic levels to just a few ppm, making it a promising method for arsenic impurity removal. However, many aspects of the deep separation mechanism of arsenic remain unexplored, posing technical barriers to effective arsenic removal in high-purity antimony production. This work introduces a “chlorine/oxygen affinity selective distillation” model to elucidate the mechanism underlying arsenic and antimony separation in chloride systems. Through thermodynamic analysis and quantum chemistry calculation, we demonstrate that arsenic species in different oxidation states exhibit markedly distinct affinities for chlorine and oxygen. The critical factor is the change in the solvation structure of As3+ as it interacts with Cl−, while the strong binding affinity between As5+ and oxygen inhibits chloride-mediated desolvation. Thus, HCl concentration plays a pivotal role in enhancing the separation efficiency of As3+ from Sb3+. Experimental results reveal that increasing HCl concentration from 5 mol/L to 7 mol/L boosts arsenic removal efficiency by 5.7 %. This mechanism may offer broader applications for the efficient separation of similar elements in chloride systems.","PeriodicalId":427,"journal":{"name":"Separation and Purification Technology","volume":"6 1","pages":""},"PeriodicalIF":8.1000,"publicationDate":"2025-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Separation and Purification Technology","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.seppur.2025.131829","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}

引用次数: 0

Abstract

The depth-separation of arsenic from antimony is crucial for achieving high-purity antimony metal. Chlorinated distillation has shown to effectively lower arsenic levels to just a few ppm, making it a promising method for arsenic impurity removal. However, many aspects of the deep separation mechanism of arsenic remain unexplored, posing technical barriers to effective arsenic removal in high-purity antimony production. This work introduces a “chlorine/oxygen affinity selective distillation” model to elucidate the mechanism underlying arsenic and antimony separation in chloride systems. Through thermodynamic analysis and quantum chemistry calculation, we demonstrate that arsenic species in different oxidation states exhibit markedly distinct affinities for chlorine and oxygen. The critical factor is the change in the solvation structure of As³⁺ as it interacts with Cl⁻, while the strong binding affinity between As⁵⁺ and oxygen inhibits chloride-mediated desolvation. Thus, HCl concentration plays a pivotal role in enhancing the separation efficiency of As³⁺ from Sb³⁺. Experimental results reveal that increasing HCl concentration from 5 mol/L to 7 mol/L boosts arsenic removal efficiency by 5.7 %. This mechanism may offer broader applications for the efficient separation of similar elements in chloride systems.

Abstract Image

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

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.