Hossein Shalchian , Ionela Birloaga , Motahareh Bagheri Moghaddam , Hadi Nasiri , Francesco Vegliò
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Several leaching reagents were studied to achieve high molybdenum dissolution. The most promising results were achieved through a two-hour process, yielding an impressive leaching efficiency of 80% and a resulting Mo concentration of 6700 mg/L. Molybdenum recovery was efficiently carried out through polyelectrolyte extraction, as confirmed by ICP and CHNS analyses, demonstrating selective precipitation of molybdenum from the solution. The subsequent calcination of the precipitated molybdenum(VI) compound resulted in the production of high-purity molybdenum trioxide. Furthermore, a conceptual hydrometallurgical treatment process for molybdenite concentrate was proposed, aiming to recover molybdenum, sulfuric acid, and copper. 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引用次数: 0
摘要
本研究调查了辉钼矿(MoS2)精矿的综合湿法冶金工艺。这项研究采用了一种结合机械活化、浸出和聚电解质萃取方法的新方法。这种综合方法有效地解决了辉钼矿浸出率低的难题,从而成功地生产出了高纯度的三氧化钼。通过 X 射线衍射、原子力显微镜和电子显微镜以及 BET 等不同方法对研磨后的辉钼矿样品进行了分析。通过模型拟合确定了研磨过程中比表面积的增加趋势,这有助于优化研磨时间。研究了几种浸出试剂,以实现钼的高溶解度。最有希望的结果是通过两小时的过程实现的,浸出效率高达 80%,钼浓度为 6700 毫克/升。钼的回收是通过聚电解质萃取有效进行的,ICP 和 CHNS 分析证实了这一点,证明了钼从溶液中的选择性沉淀。随后对沉淀的钼(VI)化合物进行煅烧,生成了高纯度的三氧化钼。此外,还提出了一种概念性的辉钼矿精矿湿法冶金处理工艺,旨在回收钼、硫酸和铜。这种拟议的工艺为钼工业在试验工厂研究中进一步探索提供了一个前景广阔的途径。
A hydrometallurgical process flowsheet for recovering MoO3 from Molybdenite
In this study, a comprehensive hydrometallurgical processing of molybdenite (MoS2) concentrate was investigated. This investigation involved a novel approach combining mechanical activation, leaching, and polyelectrolyte extraction methods. The integrated method effectively addressed the challenge of low leaching rate of molybdenite, resulting in the successful production of high-purity molybdenum trioxide. Milled molybdenite samples were analyzed by different methods of X-ray diffraction, atomic force and electron microscopy, and BET. The increasing trend of the specific surface area during milling was determined by a model fitting which was useful for optimization of milling time. Several leaching reagents were studied to achieve high molybdenum dissolution. The most promising results were achieved through a two-hour process, yielding an impressive leaching efficiency of 80% and a resulting Mo concentration of 6700 mg/L. Molybdenum recovery was efficiently carried out through polyelectrolyte extraction, as confirmed by ICP and CHNS analyses, demonstrating selective precipitation of molybdenum from the solution. The subsequent calcination of the precipitated molybdenum(VI) compound resulted in the production of high-purity molybdenum trioxide. Furthermore, a conceptual hydrometallurgical treatment process for molybdenite concentrate was proposed, aiming to recover molybdenum, sulfuric acid, and copper. This proposed process presents a promising avenue for further exploration in pilot plant studies within the molybdenum industry.
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.