Selective anion exchange adsorption of molybdenum(VI) at low concentrations from an acid leached vanadium shale solution containing aluminium and phosphorus

IF 4.8 2区 材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING
Miao Wang , Xinlong Yang , Jiankang Wen , Wenjuan Li , Hongying Yang , Wengang Liu
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引用次数: 0

Abstract

With a decline in high-grade molybdenum reserves, the development of other types of molybdenum resources have received increasing attention. Vanadium shale is a multi-metal shale and fine-grained sedimentary rock comprising small grains and various minerals. After leaching and extracting vanadium, the solution often contains a low concentration of molybdenum. However, because of the low molybdenum concentration, many processing plants treat it as an acidic wastewater, which wastes molybdenum resources and carries the risk of environmental pollution. The leaching process of vanadium shale mostly involves high-temperature and high-pressure operations, which greatly increase the content of impurity ions such as aluminium and phosphorus in the pregnant leach solution. These impurity ions increase the difficulty in separating and recovering molybdenum. In this study, the adsorption and separation of molybdenum at leach liquor of low molybdenum concentration were investigated. The effects of different factors such as: (i) pH of feed solution, (ii) adsorption time, and (iii) presence of impurity ions, aluminium and phosphorus, on the adsorption and separation of molybdenum using five different anion-exchange resins, D201, D296, D301, D314, and D301R, were investigated. The static adsorption and desorption test results showed a molybdenum adsorption capacity of 222 mg/g at pH = 1.5 by the D301 resin. The desorption efficiency using 20% NH₄OH was 96.1%. The adsorption efficiencies of aluminium and phosphorus were 1.31% and 3.10%, respectively. This is a better choice for separating molybdenum from complex solutions. The experimental results from spectra and theoretical calculations showed that the -NH group of D301 resin was combined with the O atoms of MoO3·3H2O, Al(SO4)2, and H2PO4 by electrostatic attraction. The binding energies of these three species were − 311 kJ/mol, −231 kJ/mol, and − 62.0 kJ/mol respectively, indicating that D301 resin preferentially adsorbed MoO3·3H2O. Based on the above results, the D301 resin can adsorb molybdenum(VI) in complex solutions under low pH conditions, and this study is expected to promote the comprehensive recovery of valuable metals from vanadium shale.

从含铝和磷的酸浸钒页岩溶液中选择性阴离子交换吸附低浓度钼(VI)
随着高品位钼储量的减少,其他类型钼资源的开发日益受到关注。钒页岩是一种多金属页岩和细粒沉积岩,由小颗粒和各种矿物组成。在浸出和提取钒后,溶液中往往含有低浓度的钼。然而,由于钼浓度低,许多加工厂将其作为酸性废水处理,这既浪费了钼资源,又存在环境污染的风险。钒页岩的浸出过程大多采用高温高压操作,这大大增加了孕浸液中铝、磷等杂质离子的含量。这些杂质离子增加了分离和回收钼的难度。本研究对低钼浓度浸出液中钼的吸附和分离进行了研究。不同因素的影响包括研究了以下不同因素对使用五种不同阴离子交换树脂(D201、D296、D301、D314 和 D301R)吸附和分离钼的影响:(i) 给料溶液的 pH 值;(ii) 吸附时间;(iii) 杂质离子(铝和磷)的存在。静态吸附和解吸试验结果表明,在 pH = 1.5 的条件下,D301 树脂对钼的吸附量为 222 毫克/克。使用 20% NH₄OH 的解吸效率为 96.1%。铝和磷的吸附效率分别为 1.31% 和 3.10%。这是从复杂溶液中分离钼的较佳选择。光谱和理论计算的实验结果表明,D301 树脂的 -NH 基团与 MoO3-3H2O、Al(SO4)2- 和 H2PO4- 的 O 原子通过静电吸引作用结合在一起。这三种物质的结合能分别为-311 kJ/mol、-231 kJ/mol和-62.0 kJ/mol,表明 D301 树脂优先吸附 MoO3-3H2O。基于上述结果,D301 树脂可在低 pH 条件下吸附复杂溶液中的钼(VI),该研究有望促进从钒页岩中全面回收有价金属。
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来源期刊
Hydrometallurgy
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.
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