An investigation into the sodium molybdate leaching of molybdenum calcine

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

Hydrometallurgy Pub Date : 2025-08-19 DOI:10.1016/j.hydromet.2025.106553

Jiayu Mi , Xingyu Chen , Ailiang Chen , Xuheng Liu , Jiangtao Li , Lihua He , Fenglong Sun , Zhongwei Zhao

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引用次数: 0

Abstract

The ammonia leaching-purification-crystallization process is the conventional treatment method of molybdenum calcine. This process generates large amounts of nitrogen-containing wastewater and exhaust gases. Based on the self-coordination principle of Mo, where MoO₃ with low-polymerization ability combines with Na₂MoO₄ into highly polymerized polymolybdates, this study proposes a novel, green leaching process using Na₂MoO₄ for the selective extraction of Mo from molybdenum calcine. Leaching conditions were optimized, and the reaction mechanism was elucidated through the identification of solids using XRD, EDS mapping, XPS, and Raman spectroscopy. Results show that under optimal conditions, the leaching efficiency reached 98.6 %. Molybdenum from MoO₃, PbMoO₄, and FeMoO₄ phases in the calcine was effectively extracted, while Fe and Pb oxides remained in the leach residue as PbO and Fe₂O₃·1.2H₂O, respectively. In the leachate, Mo existed primarily as Mo₇O₂₄⁶⁻, HMo₇O₂₄⁵⁻, and MoO₄²⁻. This study presents an environmentally friendly process for extracting Mo from molybdenum calcine.

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钼煅烧物的钼酸钠浸出试验研究

氨浸—净化—结晶工艺是钼煅烧的常规处理方法。这一过程产生大量含氮废水和废气。本研究基于Mo的自配位原理，即低聚合能力的MoO3与Na2MoO4结合形成高聚合的多钼酸盐，提出了采用Na2MoO4选择性提取钼煅烧物中Mo的绿色浸出新工艺。对浸出条件进行了优化，并利用XRD、EDS作图、XPS和拉曼光谱对固体进行了鉴定，阐明了反应机理。结果表明，在最佳浸出条件下，浸出率可达98.6%。煅烧物中MoO3、PbMoO4和FeMoO4相中的钼被有效萃取，而Fe和Pb氧化物分别以PbO和Fe2O3·1.2H2O的形式留在浸出渣中。在渗滤液中，Mo主要以Mo7O246−、HMo7O245−和MoO42−的形式存在。研究了一种从钼煅烧物中提取钼的环保工艺。

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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.