Microwave-enhanced leaching of magnesium and iron from iron-bearing serpentine tailings

IF 4.8 2区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Hydrometallurgy Pub Date : 2025-07-29 DOI:10.1016/j.hydromet.2025.106536

Wenjia Kou , Wengang Liu , Wenbao Liu , Wei Zuo , Weichao Li

{"title":"Microwave-enhanced leaching of magnesium and iron from iron-bearing serpentine tailings","authors":"Wenjia Kou , Wengang Liu , Wenbao Liu , Wei Zuo , Weichao Li","doi":"10.1016/j.hydromet.2025.106536","DOIUrl":null,"url":null,"abstract":"<div><div>To improve the utilization of valuable metal components in iron-bearing serpentine tailings, leaching experiments were conducted with microwave pretreatment, and the leaching conditions were optimized. The MgO and total Fe (Fe(II) and Fe(III)) leaching efficiencies reached 97.0 % and 50.9 %, respectively, using 3.0 wt% fluorite (CaF<sub>2</sub>) powder (relative to the raw ore mass), 400 W microwave pretreatment for 3 min, 70 °C reaction temperature, 30 min reaction time, 4.0 mol/L sulfuric acid, 4:1 liquid–solid ratio (mL/g), and 300 rpm stirring speed. Therefore, microwave pretreatment significantly improves the leaching efficiencies of magnesium and iron in iron-bearing serpentine tailings with the assistance of fluorite. This is because hematite in the iron-bearing serpentine tailings is less reactive toward sulfuric acid in the conventional leaching process. By contrast, microwave irradiation alters the phase composition of hematite in the serpentine tailings, enhancing its reactivity with sulfuric acid and thus facilitating iron leaching.</div></div>","PeriodicalId":13193,"journal":{"name":"Hydrometallurgy","volume":"237 ","pages":"Article 106536"},"PeriodicalIF":4.8000,"publicationDate":"2025-07-29","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/S0304386X2500101X","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

To improve the utilization of valuable metal components in iron-bearing serpentine tailings, leaching experiments were conducted with microwave pretreatment, and the leaching conditions were optimized. The MgO and total Fe (Fe(II) and Fe(III)) leaching efficiencies reached 97.0 % and 50.9 %, respectively, using 3.0 wt% fluorite (CaF₂) powder (relative to the raw ore mass), 400 W microwave pretreatment for 3 min, 70 °C reaction temperature, 30 min reaction time, 4.0 mol/L sulfuric acid, 4:1 liquid–solid ratio (mL/g), and 300 rpm stirring speed. Therefore, microwave pretreatment significantly improves the leaching efficiencies of magnesium and iron in iron-bearing serpentine tailings with the assistance of fluorite. This is because hematite in the iron-bearing serpentine tailings is less reactive toward sulfuric acid in the conventional leaching process. By contrast, microwave irradiation alters the phase composition of hematite in the serpentine tailings, enhancing its reactivity with sulfuric acid and thus facilitating iron leaching.

查看原文本刊更多论文

微波强化浸出含铁蛇纹石尾矿中的镁和铁

为提高含铁蛇纹石尾矿中有价金属成分的利用率，进行了微波预处理浸出试验，并对浸出条件进行了优化。当使用重量为3.0 wt%的萤石（CaF2）粉（相对于原矿质量）、400 W微波预处理3 min、反应温度70℃、反应时间30 min、硫酸4.0 mol/L、液固比（mL/g）为4:1、搅拌速度300 rpm时，MgO和总Fe（Fe（II）和Fe(III)）的浸出率分别达到97.0%和50.9%。因此，在萤石的辅助下，微波预处理可显著提高含铁蛇纹石尾矿中镁和铁的浸出效率。这是因为含铁蛇纹石尾矿中的赤铁矿在常规浸出过程中对硫酸反应性较弱。微波辐照改变了蛇纹石尾矿中赤铁矿的物相组成，增强了赤铁矿与硫酸的反应性，有利于铁的浸出。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Hydrometallurgy 工程技术-冶金工程

CiteScore

9.50

自引率

6.40%

发文量

144

审稿时长

3.4 months

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.