Investigation of binary salt fluids with higher volume susceptibility for high gradient magnetic separation coupling with magnetic fluid

IF 5.2 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-10-10 DOI:10.1016/j.molliq.2025.128702

Xiayu Zheng, Shuangjia Li, Yuhua Wang, Dongfang Lu

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引用次数: 0

Abstract

High-gradient magnetic separation coupling with magnetic fluid (HGMSCMF) employs paramagnetic fluids to decrease competing capture of magnetic gangue minerals, significantly improving selectivity and separation efficiency in recovering weakly magnetic minerals. Fluid volume susceptibility is the most important parameter in HGMSCMF. However, being limited by volume susceptibility of unary salt solutions, HGMSCMF is somewhat deficient in obtaining high-quality concentrate in processing refractory weakly magnetic minerals such as ilmenite ore in Panxi area of China. In this study, binary salt solutions (mainly ferric and manganese salts) with higher volume susceptibility were regulated and the performance in HGMSCMF was examined. Volume susceptibility of paramagnetic salt solutions is determined by the molar specific susceptibility and molarity of paramagnetic ions. Binary solutions of MnCl₂-Fe(NO₃)₃ and FeCl₃-Mn(NO₃)₂ can exhibit high volume susceptibility up to 1240 × 10⁻⁶, which is much higher than that of 40 % MnCl₂ solution. Particle capture and ore separation performance of binary salt solutions were investigated. Binary salt solutions present lower captured mass of augite particles (gangue mineral) in particle capture tests, along with higher TiO₂ grade of magnetic products and good adaptability to pulsating flow in actual ore separation. Ilmenite concentrate assaying 47.25 % TiO₂ are obtained (at TiO₂ recovery of 42.91 %) with binary solution of 25 % FeCl₃–38 % Mn(NO₃)₂ through one roughing and four cleanings. Results of numerical simulation of particle capture is in good agreement with those of experiments. Binary salt solutions present higher volume susceptibility and good application potential in the processing of refractory weakly magnetic minerals.

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高体积磁化率二元盐流体与磁流体耦合高梯度磁选的研究

高梯度磁选耦合磁流体（HGMSCMF）利用顺磁流体减少磁性脉石矿物的竞争捕获，显著提高弱磁性矿物的选择性和分离效率。流体体积敏感性是HGMSCMF中最重要的参数。但在处理攀西地区钛铁矿等难选弱磁性矿物时，受单盐溶液体积敏感性的限制，HGMSCMF在获得高质量精矿方面存在一定不足。在本研究中，调节了具有较高体积敏感性的二元盐溶液（主要是铁盐和锰盐），并测试了HGMSCMF中的性能。顺磁性盐溶液的体积磁化率由顺磁性离子的摩尔比磁化率和摩尔浓度决定。MnCl2- fe (NO3)3和FeCl3-Mn(NO3)2二元溶液的体积敏感性可达1240 × 10−6，远高于40% MnCl2溶液。研究了二元盐溶液的颗粒捕获和矿石分离性能。在颗粒捕获试验中，二元盐溶液中奥辉石颗粒（脉石矿物）捕获质量较低，磁选产物TiO2品位较高，对实际选矿脉动流的适应性较好。采用25% fecl3 - 38% Mn(NO3)2二元溶液，经过1次粗选和4次精选，得到TiO2含量为47.25%的钛铁矿精矿，TiO2回收率为42.91%。粒子捕获的数值模拟结果与实验结果吻合较好。二元盐溶液在处理难选弱磁性矿物方面具有较高的体积磁化率和良好的应用潜力。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.