Efficient flotation separation of chalcopyrite from molybdenite and adsorption mechanism by green depressant pyrogallic acid

IF 5.3 2区化学 Q2 CHEMISTRY, PHYSICAL Journal of Molecular Liquids Pub Date : 2024-08-16 DOI:10.1016/j.molliq.2024.125803

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Abstract

Chalcopyrite and molybdenite are the primary minerals from which copper and molybdenum are extracted. However, the separation of chalcopyrite and molybdenite is restricted because of their inherent floatability. This study explores the separation effects of the addition of a green depressant, pyrogallic acid (PA), on chalcopyrite and molybdenite. The feasibility of flotation separation was verified by flotations tests with chalcopyrite and molybdenite under weak acid conditions at pH 6. The zeta potential and total organic carbon (TOC) illustrated that PA could have strong chemical adsorption on the surface of chalcopyrite and weak adsorption on the surface of molybdenite. Fourier-transform infrared (FTIR) spectroscopy illustrated that PA had a strong redox reaction at the surface of chalcopyrite. X-ray photoelectron spectroscopy (XPS) results illustrated that the reaction occurred through the generation of Cu/Fe-OH complexes covered on the chalcopyrite surface to reduce the active adsorption sites, which led to a decrease in the collection capacity for chalcopyrite. Moreover, time-of-flight secondary ion mass spectrometry (ToF-SIMS) results showed that the Cu and Fe sites on the surface of chalcopyrite were oxidized by PA. The intensities of FeOH⁻ and CuOH⁻ were found to be enhanced in the fragmentation peaks. Accordingly, a new selective adsorption model of PA on chalcopyrite and molybdenite was proposed.

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从辉钼矿中高效浮选分离黄铜矿及绿色抑制剂焦金酸的吸附机理

黄铜矿和辉钼矿是提取铜和钼的主要矿物。然而，由于黄铜矿和辉钼矿固有的可浮性，它们的分离受到了限制。本研究探讨了添加绿色抑制剂焦金酸（PA）对黄铜矿和辉钼矿的分离效果。通过在 pH 值为 6 的弱酸条件下对黄铜矿和辉钼矿进行浮选试验，验证了浮选分离的可行性。ZETA 电位和总有机碳（TOC）表明，PA 在黄铜矿表面有较强的化学吸附性，而在辉钼矿表面则有较弱的吸附性。傅立叶变换红外光谱（FTIR）表明 PA 在黄铜矿表面发生了强烈的氧化还原反应。X 射线光电子能谱（XPS）结果表明，该反应是通过在黄铜矿表面生成 Cu/Fe-OH 复合物来减少活性吸附位点，从而降低黄铜矿的收集能力。此外，飞行时间二次离子质谱（ToF-SIMS）结果表明，黄铜矿表面的 Cu 和 Fe 位点被 PA 氧化。在碎片峰中，FeOH- 和 CuOH- 的强度被增强。因此，提出了 PA 在黄铜矿和辉钼矿上的新选择性吸附模型。

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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.