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Role of Montmorillonite, Kaolinite, or Illite in Pyrite Flotation: Differences in Clay Behavior Based on Their Structures.
Langmuir ( IF 3.7 ) Pub Date : 2020-08-19 , DOI: 10.1021/acs.langmuir.0c02073 Licai Chen 1, 2 , Yunliang Zhao 1, 2, 3 , Haoyu Bai 1, 2 , Zhong Ai 1, 2 , Peng Chen 1, 2 , Yangjia Hu 4 , Shaoxian Song 1, 2 , Sridhar Komarneni 3
Langmuir ( IF 3.7 ) Pub Date : 2020-08-19 , DOI: 10.1021/acs.langmuir.0c02073 Licai Chen 1, 2 , Yunliang Zhao 1, 2, 3 , Haoyu Bai 1, 2 , Zhong Ai 1, 2 , Peng Chen 1, 2 , Yangjia Hu 4 , Shaoxian Song 1, 2 , Sridhar Komarneni 3
Affiliation
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It is widely acknowledged that clay minerals have detrimental effects on the process of flotation, but the mechanisms involved are still not fully understood. In this work, the effects of montmorillonite, kaolinite, and illite on pyrite flotation were investigated from the perspective of various structures of clay minerals. Flotation tests suggested that the detrimental effect of clay minerals on the flotation of pyrite increased as follows: montmorillonite > kaolinite > illite. With the help of rheology measurements, it was found that montmorillonite significantly increased pulp viscosity, which in turn substantially reduced pyrite recovery and grade. Scanning electron microscopy (SEM) images suggested that montmorillonite formed the “house-of-cards” structure by edge-to-edge and edge-to-face contact, while kaolinite and illite platelets were associated mainly in the face-to-face mode. In addition, it was clearly observed by SEM–energy dispersive spectrometry that montmorillonite and kaolinite coat on the pyrite surfaces, which would lower the surface hydrophobicity of pyrite. Kaolinite covered much larger area of pyrite surface than montmorillonite owing to the positive charge occurring at the exposed aluminum–oxygen octahedral sheet of kaolinite. Although illite has a similar 2:1 structure to montmorillonite, it showed little or no effect on pyrite flotation, which was attributed to its poor swelling nature. These findings shed light on the root cause of the adverse effect of clay minerals on pyrite flotation and are expected to provide theoretical guidance for mitigating the negative effects on flotation caused by clays.
中文翻译：
硫铁矿浮选中的蒙脱石，高岭石或伊利石的作用：基于其结构的粘土行为差异。
众所周知，粘土矿物对浮选过程有不利影响，但其机理尚不完全清楚。在这项工作中，从粘土矿物的各种结构的角度研究了蒙脱石，高岭石和伊利石对黄铁矿浮选的影响。浮选试验表明，粘土矿物对黄铁矿浮选的不利影响增加如下：蒙脱石>高岭石>伊利石。借助流变学测量，发现蒙脱石显着提高了纸浆粘度，从而大大降低了黄铁矿的回收率和品位。扫描电子显微镜（SEM）图像表明，蒙脱土通过边对边和边对面接触形成了“卡片屋”结构，高岭石和伊利石血小板主要以面对面的方式联系在一起。此外，通过SEM能量色散光谱法可以清楚地观察到，蒙脱石和高岭石覆盖在黄铁矿表面，这会降低黄铁矿的表面疏水性。高岭石比蒙脱石覆盖的黄铁矿表面面积要大得多，这是由于在暴露的高岭石铝氧八面体片上产生了正电荷。尽管伊利石具有与蒙脱石相似的2：1结构，但对黄铁矿浮选几乎没有影响，甚至没有影响，这是由于其溶胀性差。这些发现揭示了粘土矿物对黄铁矿浮选不利影响的根本原因，并有望为减轻粘土对浮选的不利影响提供理论指导。
更新日期：2020-09-15
中文翻译：
硫铁矿浮选中的蒙脱石，高岭石或伊利石的作用：基于其结构的粘土行为差异。
众所周知，粘土矿物对浮选过程有不利影响，但其机理尚不完全清楚。在这项工作中，从粘土矿物的各种结构的角度研究了蒙脱石，高岭石和伊利石对黄铁矿浮选的影响。浮选试验表明，粘土矿物对黄铁矿浮选的不利影响增加如下：蒙脱石>高岭石>伊利石。借助流变学测量，发现蒙脱石显着提高了纸浆粘度，从而大大降低了黄铁矿的回收率和品位。扫描电子显微镜（SEM）图像表明，蒙脱土通过边对边和边对面接触形成了“卡片屋”结构，高岭石和伊利石血小板主要以面对面的方式联系在一起。此外，通过SEM能量色散光谱法可以清楚地观察到，蒙脱石和高岭石覆盖在黄铁矿表面，这会降低黄铁矿的表面疏水性。高岭石比蒙脱石覆盖的黄铁矿表面面积要大得多，这是由于在暴露的高岭石铝氧八面体片上产生了正电荷。尽管伊利石具有与蒙脱石相似的2：1结构，但对黄铁矿浮选几乎没有影响，甚至没有影响，这是由于其溶胀性差。这些发现揭示了粘土矿物对黄铁矿浮选不利影响的根本原因，并有望为减轻粘土对浮选的不利影响提供理论指导。
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