{"title":"Uses of H2 and CO2 gases in hydrometallurgical processes: Potential towards sustainable pretreatment, metal production and carbon neutrality","authors":"Jae-chun Lee , Kurniawan Kurniawan , Yong Jae Suh , Banshi Dhar Pandey","doi":"10.1016/j.hydromet.2025.106468","DOIUrl":null,"url":null,"abstract":"<div><div>Hydrometallurgical practices represent a vital area of focus within the metallurgical sector, and it is critical that these practices are carried out in an environmentally friendly manner in order to promote sustainability and responsible processing. One promising approach is the use of hydrogen gas (H<sub>2</sub>), known for its ‘green’ properties, along with the pollutant carbon dioxide (CO<sub>2</sub>), at various stages within the unit operations relevant to hydrometallurgical processes. This review provides a detailed overview of the utilization of H<sub>2</sub> and CO<sub>2</sub> gases, encompassing key stages including pretreatment, leaching, and metal recovery. Theoretical underpinnings are also provided for each stage, along with an overview of cutting-edge approaches such as application of supercritical CO<sub>2</sub>. Challenges and future directions associated with H<sub>2</sub> and CO<sub>2</sub> utilization are also discussed. This review serves an important step towards advancing sustainable hydrometallurgical processes promoting carbon neutrality.</div></div>","PeriodicalId":13193,"journal":{"name":"Hydrometallurgy","volume":"234 ","pages":"Article 106468"},"PeriodicalIF":4.8000,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Hydrometallurgy","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0304386X25000337","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"METALLURGY & METALLURGICAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
Hydrometallurgical practices represent a vital area of focus within the metallurgical sector, and it is critical that these practices are carried out in an environmentally friendly manner in order to promote sustainability and responsible processing. One promising approach is the use of hydrogen gas (H2), known for its ‘green’ properties, along with the pollutant carbon dioxide (CO2), at various stages within the unit operations relevant to hydrometallurgical processes. This review provides a detailed overview of the utilization of H2 and CO2 gases, encompassing key stages including pretreatment, leaching, and metal recovery. Theoretical underpinnings are also provided for each stage, along with an overview of cutting-edge approaches such as application of supercritical CO2. Challenges and future directions associated with H2 and CO2 utilization are also discussed. This review serves an important step towards advancing sustainable hydrometallurgical processes promoting carbon neutrality.
期刊介绍：
Hydrometallurgy aims to compile studies on novel processes, process design, chemistry, modelling, control, economics and interfaces between unit operations, and to provide a forum for discussions on case histories and operational difficulties.
Topics covered include: leaching of metal values by chemical reagents or bacterial action at ambient or elevated pressures and temperatures; separation of solids from leach liquors; removal of impurities and recovery of metal values by precipitation, ion exchange, solvent extraction, gaseous reduction, cementation, electro-winning and electro-refining; pre-treatment of ores by roasting or chemical treatments such as halogenation or reduction; recycling of reagents and treatment of effluents.
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