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Heterocoagulation mechanism between galena and fine calcite minerals in flotation separation

方铅矿与微细粒方解石在矿物浮选分离中的异相凝聚机理研究

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Abstract

Heterocoagulation between fine particles can interfere with the flotation separation of different minerals. Therefore, the study of particle heterocoagulation is significant. This study found that fine calcite affected galena flotation and examined the interactions between galena and fine calcite particles in suspension pulp. The best flotation behaviour was observed for pure galena minerals at pH 9; however, the flotation separation of galena and fine calcite yielded unsatisfactory results under these conditions. The results of zeta potential measurement, scanning electron microscopy, and X-ray photoelectron spectroscopy indicate that heterocoagulation occurred between the calcite and galena particles at pH 9. The interaction mechanism shows that dissolved hydroxy calcium could be absorbed on the surface of galena and render a positive charge, causing coagulation between the calcite and galena particles due to electrostatic attraction. This new discovery provides a reference for the pre-inhibition of gangue minerals and adjustment of the chemical ratio during the flotation process.

摘要

本研究发现微细粒方解石会影响方铅矿的浮选回收,试验研究表明在pH=9、丁基黄药用量为80 mg/L 时方铅矿浮选效果最佳。但在此条件下,方铅矿与微细粒方解石的人工混合矿中,方铅矿的浮选受到了明显的抑制,浮选效果较差。针对这一现象分析并探究方铅矿与微细粒方解石之间的相互作用机理。通过浊度分析、扫描电子显微镜分析、能谱分析、ICP 测量,XPS 分析、Zeta 电位测量等发现,方铅矿与微细粒方解石之间发生了异相凝聚。通过研究两者的相互作用机理发现,单一的方铅矿在试验所研究的pH 范围内荷负电,未检测到其等电点,单一的方解石等电点pH 约为8.5,当pH=9时单一的方解石与单一的方铅矿均荷负电,颗粒间表现的作用能为相互排斥,二者之间不会发生凝聚现象;但在方铅矿和方解石的人工混合矿中却发生了凝聚,其原因为矿浆中的方解石解离出一定数量的钙离子,钙离子通过水解作用生成羟基钙,羟基钙是导致异相凝聚的关键粒子,羟基钙荷正电,吸附在方铅矿的表面,从而改变方铅矿表面的Zeta 电位,使得方解石和方铅矿表面电位相反,通过粒子之间的相互作用力使二者发生异相凝聚。这一新发现为浮选过程中脉石矿物的预抑制和科学的化学配比调整提供了参考。

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Authors and Affiliations

  1. School of Land Resources Engineering, Kunming University of Science and Technology, Kunming, 650093, China

    Rui-kang Wang  (王瑞康), Zhuo-yue Lan  (蓝卓越), Dong-xia Feng  (封东霞), Qing-ping Zhao  (赵清平), Di Yang  (杨迪) & Xiong Tong  (童雄)

  2. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming, 650093, China

    Rui-kang Wang  (王瑞康), Zhuo-yue Lan  (蓝卓越), Dong-xia Feng  (封东霞), Qing-ping Zhao  (赵清平), Di Yang  (杨迪) & Xiong Tong  (童雄)

  3. Yunnan Province Engineering Research Center for Reutilization of Metal Tailings Resources, Kunming, 650093, China

    Rui-kang Wang  (王瑞康), Zhuo-yue Lan  (蓝卓越), Dong-xia Feng  (封东霞), Qing-ping Zhao  (赵清平), Di Yang  (杨迪) & Xiong Tong  (童雄)

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  1. Rui-kang Wang  (王瑞康)
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  6. Xiong Tong  (童雄)
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Contributions

The overalling research goal was jointly formulated by WANG Rui-kang, LAN Zhuo-yue and ZHAO Qing-ping. WANG Rui-kang and ZHAO Qing-ping conducted experimental exploration and analyzed the measured data. FENG Dong-xia made adjustments to the writing and editing of the article. YANG Di analyzed the calculation results. TONG Xiong conducted methodological and research investigations. The first draft was co-written by WANG Rui-kang, LAN Zhuo-yue, FENG Dong-xia and ZHAO Qing-ping. All authors responded to hte reviewers’ comments and revised the final version.

Corresponding author

Correspondence to Zhuo-yue Lan  (蓝卓越).

Ethics declarations

WANG Rui-kang, LAN Zhuo-yue, FENG Dong-xia, ZHAO Qing-ping, YANG Di, and TONG Xiong declare that they have no conflict of interest.

Additional information

Foundation item: Project(5196040249) supported by the National Natural Science Foundation of China

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Wang, Rk., Lan, Zy., Feng, Dx. et al. Heterocoagulation mechanism between galena and fine calcite minerals in flotation separation. J. Cent. South Univ. 31, 127–137 (2024). https://doi.org/10.1007/s11771-024-5564-0

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  • DOI: https://doi.org/10.1007/s11771-024-5564-0

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