Laterite ore processing with hydrogen via mild chemical pressure leaching or bioleaching

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

Hydrometallurgy Pub Date : 2025-02-01 DOI:10.1016/j.hydromet.2025.106447

Axel Schippers, Stefanie A. Hetz, Christian Ostertag-Henning

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Abstract

Limonitic laterites consist of a high amount of iron oxides/hydroxides, such as goethite and hematite, being recalcitrant in hydrometallurgical processing for nickel and cobalt recovery. High pressure acid leaching (HPAL) is the currently most applied processing technology for limonitic laterites. Still, research is ongoing to develop technologies with less energy consumption and a lower carbon footprint. Among these, chemical leaching under mild conditions and bioleaching were investigated, as well as using hydrogen gas as a reductant. In this study, these approaches were combined. Bioleaching of laterite ore using hydrogen was shown for the first time, and anaerobic batch incubation with Acidithiobacillus ferrooxidans showed that bioleaching with hydrogen was as efficient in metal extraction as with addition of elemental sulfur. Chemical laterite leaching with hydrogen under pressure at 50 bar and ambient temperature also succeeded in metal extraction; however, the leaching efficiency strongly depended on the laterite mineralogical composition.

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通过温和的化学压力浸出或生物浸出，用氢处理红土矿石

褐铁矿红土由大量氧化铁/氢氧化物组成，如针铁矿和赤铁矿，在镍和钴的湿法冶金处理中具有难治性。高压酸浸是目前应用最广泛的褐铁矿处理技术。尽管如此，开发能耗更低、碳足迹更低的技术的研究仍在进行中。其中，研究了温和条件下的化学浸出和生物浸出，以及氢气作为还原剂的浸出。在这项研究中，这些方法被结合起来。首次利用氢气对红土矿石进行了生物浸出，并与氧化亚铁硫杆菌进行厌氧间歇培养，结果表明氢浸出的金属浸出效果与添加单质硫的浸出效果相同。在50 bar压力和常温条件下，氢化学浸出红土也成功地提取了金属；而浸出效率与红土的矿物组成密切相关。

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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.