抛落磨矿下多组元复杂矿石与其组元矿物磨矿特性研究
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广西大学

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TD98

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国家自然科学基金(52274258; 51874105);广西科技计划项目(桂科AA22068083)。


Study on grinding characteristics of complex multi-component ore and its component minerals under throw grinding
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College of Resources,Environment and Materials,Guangxi Higher School Key Laboratory of Minerals Engineering,Guangxi University

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    摘要:

    针对多组元复杂矿石选择性磨矿现象及复杂矿石与其组元矿物关联研究的缺乏,基于磨矿介质运动理论及选择性磨矿原理分析方法,采用破碎率、磨矿速度、磨矿产品参数t10等指标进行磨矿特性的表征,研究了抛落磨矿下多金属复杂矿石与其组元矿物磁黄铁矿、闪锌矿、石英的磨矿特性之间的关系。结果表明,多金属复杂矿石在抛落磨矿时,闪锌矿提高了矿石破碎效果,即闪锌矿的存在对矿石破碎效果起积极作用;磁黄铁矿和石英降低了矿石破碎效果,即磁黄铁矿与石英的存在对矿石破碎效果起消极作用。不同组元矿物磨矿产品的粒度特性都会影响矿石磨矿产品的粒度特性,且闪锌矿的影响更为显著。矿石与其组元矿物的磨矿速度均随磨矿时间延长呈指数减小,并在磨矿时间达到4min时磨矿速度快速减小的趋势到达阈值。研究结果可为后续抛落磨矿下多组元复杂矿石磨矿优化调控研究提供理论指导。

    Abstract:

    In response to the occurrence of selective grinding phenomena in polymetallic complex ores and the lack of associated research on complex ores and their constituent minerals, an investigation was conducted based on the motion theory of grinding media and the principles of selective grinding. The grinding characteristics were elucidated using metrics such as the breakage rate, grinding speed, and the t10 parameter of the ground product. The relationship between the grinding characteristics of polymetallic complex ores and their component minerals, including pyrrhotite, sphalerite, and quartz, under throw grinding conditions was investigated. The results show that during throwing state, sphalerite enhances the ore comminution effect, indicating that the presence of sphalerite plays a positive role in ore crushing; whereas pyrrhotite and quartz diminish the ore comminution effect, meaning their presence exerts a negative influence on ore crushing. The particle size characteristics of the grinding products of different constituent minerals all affect the particle size characteristics of the ore grinding products, with sphalerite showing a more significant impact on the ore’s grinding characteristics. The grinding rate of both the ore and its constituent minerals exponentially decreases with prolonged grinding time, reaching a threshold when the grinding time reaches 4 minutes, where the rate of decrease rapidly slows. These findings can provide theoretical guidance for subsequent research on the optimization and control of grinding polymetallic complex ores under throw grinding.

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  • 收稿日期:2024-05-26
  • 最后修改日期:2024-06-29
  • 录用日期:2024-07-03
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