Flotation separation of chalcopyrite and molybdenite in advanced oxidation systems: Experimental and mechanism study

IF 4.6 2区工程技术 Q2 ENGINEERING, CHEMICAL Powder Technology Pub Date : 2025-03-04 DOI:10.1016/j.powtec.2025.120876

Wenhui Yang , Xianhui Qiu , Chunlong Liu , Guanfei Zhao , Huashan Yan , Xiaomin He , Kaiwei Ding , Qinghao Jiao , Tingsheng Qiu

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Abstract

In this paper, the flotation performance and mechanism of chalcopyrite and molybdenite in persulfate/Fe²⁺ systems were evaluated for the first time. The flotation results showed that the recovery difference between chalcopyrite and molybdenite was 63.41 % when PS/Fe²⁺ were used as depressants. Radicals ·OH and SO₄-· can be observed in electron paramagnetic resonance analysis, indicating that the addition of PS/Fe²⁺ constitutes an advanced oxidation process in minerals systems. The free radical quenching experiments further verified that the free radicals depressed chalcopyrite. To explore the mechanism of free radicals, the contact angle, Fourier transform infrared spectroscopy, Cyclic voltammetry curves and X-ray photoelectron spectroscopy measurements were carried out. The results showed that after PS/Fe²⁺ treatment, the surface of chalcopyrite was covered by oxides/hydroxides, while the surface of molybdenite had little change and still maintained good hydrophobicity. Finally, a possible model for reacting PS/Fe²⁺ with chalcopyrite was proposed.

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黄铜矿和辉钼矿在高级氧化体系中的浮选分离：实验与机理研究

本文首次对过硫酸盐/Fe2+体系中黄铜矿和辉钼矿的浮选性能和浮选机理进行了评价。浮选结果表明，以PS/Fe2+为抑制剂时，黄铜矿与辉钼矿的回收率相差63.41%。电子顺磁共振分析可观察到自由基·OH和SO4-·，表明PS/Fe2+的加入构成了矿物体系的高级氧化过程。自由基猝灭实验进一步证实了自由基对黄铜矿的抑制作用。通过接触角、傅里叶变换红外光谱、循环伏安曲线和x射线光电子能谱测量来探讨自由基的作用机理。结果表明：PS/Fe2+处理后，黄铜矿表面被氧化物/氢氧化物覆盖，而辉钼矿表面变化不大，仍保持良好的疏水性；最后，提出了PS/Fe2+与黄铜矿反应的可能模型。

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来源期刊

Powder Technology 工程技术-工程：化工

CiteScore

9.90

自引率

15.40%

发文量

1047

审稿时长

46 days

期刊介绍： Powder Technology is an International Journal on the Science and Technology of Wet and Dry Particulate Systems. Powder Technology publishes papers on all aspects of the formation of particles and their characterisation and on the study of systems containing particulate solids. No limitation is imposed on the size of the particles, which may range from nanometre scale, as in pigments or aerosols, to that of mined or quarried materials. The following list of topics is not intended to be comprehensive, but rather to indicate typical subjects which fall within the scope of the journal's interests: Formation and synthesis of particles by precipitation and other methods. Modification of particles by agglomeration, coating, comminution and attrition. Characterisation of the size, shape, surface area, pore structure and strength of particles and agglomerates (including the origins and effects of inter particle forces). Packing, failure, flow and permeability of assemblies of particles. Particle-particle interactions and suspension rheology. Handling and processing operations such as slurry flow, fluidization, pneumatic conveying. Interactions between particles and their environment, including delivery of particulate products to the body. Applications of particle technology in production of pharmaceuticals, chemicals, foods, pigments, structural, and functional materials and in environmental and energy related matters. For materials-oriented contributions we are looking for articles revealing the effect of particle/powder characteristics (size, morphology and composition, in that order) on material performance or functionality and, ideally, comparison to any industrial standard.