A novel eco-friendly depressant using Chlorella pyrenoidosa for flotation separation of hematite from quartz

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-04-15 DOI:10.1016/j.molliq.2025.127591

Yu Zheng, Zhichao Yang, Qing Teng, Suhong Zhang, Ni Gao

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Abstract

The flotation separation of hematite and quartz presents significant challenges due to the easy activation of quartz by metal cations, which reduces the selectivity of fatty acid collectors. In this work, Chlorella pyrenoidosa (CP) was employed as a quartz depressant in iron ore flotation. Micro-flotation results indicated that CP showed excellent separation efficiency for hematite from quartz using sodium oleate (NaOL) as a collector, and the artificial mixed mineral tests indicated that the TFe grade of the concentrate and recovery rate reached 60.40 % and 83.74 %, respectively. The adsorption measurements and contact angle analysis results show that the adsorption of CP on the hematite surface is lower than on the quartz surface, and the binding of CP to Fe(III) hinders the adsorption of NaOL on the quartz surface. The functional groups and adsorption mechanism of CP were further investigated by FTIR and XPS analysis. The results demonstrate that combining Fe(III) with –COOH and –OH groups on the surface of the CP cell wall facilitate selective adsorption on the mineral surface. The weak adsorption of Fe(III)-CP on the hematite surface does not hinder the strong chemical adsorption of NaOL on the hematite surface, whereas the chemical adsorption of Fe(III)-CP on the quartz surface prevents the adsorption of NaOL on the quartz surface and depresses the flotation of quartz. Therefore, the flotation separation of hematite from quartz was successfully accomplished. The model of flotation separation of hematite from quartz system with CP and NaOL was drawn.

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利用核核小球藻浮选分离赤铁矿和石英的新型环保型抑制剂

由于石英容易被金属阳离子活化，从而降低了脂肪酸捕收剂的选择性，因此对赤铁矿和石英的浮选分离提出了重大挑战。本研究将核核小球藻（Chlorella pyrenoidosa， CP）作为石英抑制剂用于铁矿浮选。微浮选结果表明，以油酸钠（NaOL）为捕收剂的CP对石英中赤铁矿具有良好的分离效果，人工混合矿物试验表明，精矿TFe品位和回收率分别达到60.40%和83.74%。吸附测量和接触角分析结果表明，CP在赤铁矿表面的吸附量低于在石英表面的吸附量，CP与Fe（III）的结合阻碍了NaOL在石英表面的吸附。通过FTIR和XPS分析进一步研究了CP的官能团和吸附机理。结果表明，Fe（III）与CP细胞壁表面的-COOH和-OH基团结合，有利于矿物表面的选择性吸附。Fe(III)-CP在赤铁矿表面的弱吸附不妨碍NaOL在赤铁矿表面的强化学吸附，而Fe(III)-CP在石英表面的化学吸附阻碍了NaOL在石英表面的吸附，抑制了石英的浮选。因此，成功地完成了赤铁矿与石英的浮选分离。建立了CP - NaOL浮选分离石英体系中赤铁矿的模型。

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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.