Recovery of valuable metal products from the leach residue of sedimentary rare earth ore by acid leaching and precipitation

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

Hydrometallurgy Pub Date : 2025-02-06 DOI:10.1016/j.hydromet.2025.106449

Xingyu Mao, Qi Liu, Lijuan Liang, Shanshan Yu, Xianquan Ao

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引用次数: 0

Abstract

The residue produced after extracting rare earth elements from sedimentary rare earth ore (SREO) contains valuable metals. The effective separation and extraction of valuable metals from this residue is crucial for enhancing the utilization value of SREO and addressing the challenges associated with solid-waste disposal. In this study, Al and Fe were leached from SREO residue using a mixture of sulfuric and phosphoric acids. The leach residue was subsequently subjected to sulfuric acid curing and dilute acid leaching to extract Ti. Results showed that the Al and Fe leaching efficiencies were highest (88.3 % and 98.6 %, respectively) at sulfuric acid: phosphoric acid mass ratio = 7:3, liquid–solid ratio = 4:1, temperature = 110 °C, and time = 4 h. The Ti leaching efficiency was highest (76.2 %) at sulfuric acid: residue mass ratio = 1.7:1, curing time = 4 h, and temperature = 180 °C. The leach residue was enriched with SiO₂, and the resulting leachate was employed to produce Al₂O₃, FePO₄, and TiO₂. The resulting filtrate was condensed and crystallized to yield (NH₄)₂SO₄ and NH₄H₂PO₄.

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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.