Grinding efficiencies of bentonite-containing ores have been rarely investigated in the literature even though bentonite is found in various ores such as refractory and free-milling gold ores. In this work, the influence of the cation valency of grinding additives on the grinding behaviour of bentonite-containing ores has been studied. The results indicate that the presence of bentonite in the ore requires more energy for grinding compared to grinding in its absence. It was found that the particle size for the same energy consumption during grinding of the bentonite slurry decreased in the following order with cation addition: Al3+ > Mg2+ > K+. The additions of Al3+ ions particularly reduced the repulsive forces between bentonite particles as confirmed using the zeta potential measurements. Therefore, the ore-bentonite slurries in the presence of Al3+ significantly reduced shear forces between particles, leading to improved settling rates and grinding performance. This paper illustrates how the valency number of added grinding additives can substantially alter slurry chemistry, thereby enhancing grinding performance.

中文翻译：

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一价、二价和三价离子对含膨润土矿石粉磨效率的影响


含膨润土矿石的研磨效率在文献中很少研究，尽管膨润土存在于各种矿石中，例如耐火金矿石和自由研磨金矿石。在这项工作中，研究了研磨添加剂的阳离子化合价对含膨润土矿石的研磨行为的影响。结果表明，与不存在膨润土的研磨相比，矿石中存在膨润土需要更多的能量进行研磨。研究发现，在粉磨过程中，相同能耗下的膨润土浆料粒径随着阳离子的添加而按以下顺序减小：Al3+ > Mg2+ > K+。Al3+ 离子的添加特别降低了膨润土颗粒之间的排斥力，使用 zeta 电位测量证实了这一点。因此，在 Al3+ 存在下，矿石-膨润土浆料显著降低了颗粒之间的剪切力，从而提高了沉降速率和研磨性能。本文说明了添加的研磨添加剂的化合价数如何显著改变研磨液的化学性质，从而提高研磨性能。