基于聚氧化乙烯分子作用的微细辉钼矿浮选强化机理研究

Molybdenum ore is China’s strategic mineral resources. The reserve of molybdenum ore are relatively rich, but ore grade less than 0.1% accounted for more than 65%. With the continuous increase of molybdenum demand, the utilization of low-grade molybdenum ore is extremely urgent. But low flotation efficiency restricts utilization of low-grade molybdenum ore. Selective flocculation-flotation is an effective method for the separation of low-grade ore. Previous studies have shown that selective flocculation of molybdenite has been proved. However, the interaction mechanism of polyethylene oxide in the flotation process of micro-fine molybdenite is still unclear. Therefore, this project aims at the interfacial interaction investigation of polyethylene oxide in the flotation of micro-fine molybdenite. The adsorption difference and surface wettability effect of polyethylene oxide on different cleavage surfaces of molybdenite can be revealed by the study of adsorption behavior and wetting response of polyethylene oxide on different cleavage surfaces of molybdenite. What' more, the spreading wetting behavior of collector on different cleavages of molybdenite before and after pretreated by polyethylene oxide solution will be studied and the influence mechanism of polyethylene oxide on the adsorption of collectors on different cleavages of molybdenit will be revealed. Additionally, the interaction forces between different cleavage surfaces of molybdenite and the flocculation response with the action of polyethylene oxide will be studied to clarify the mechanism of floc formation. Finally, differences in mineralization behavior will be revealed by study of mineralization process of molybdenite particles and bubbles before and after polyethylene oxide addition. Research of the project can provide theoretical guidance and method reference for the utilization of low-grade molybdenum ore, and has important practical significance.

钼矿是我国战略矿产资源，储量较为丰富，但品位低于0.1%矿石占65%以上。随着钼需求量持续增大，低品位矿石开发迫在眉睫，而浮选效率低制约低品位钼矿开发。选择性絮凝-浮选是低品位矿石分选的有效方法。前期研究表明聚氧化乙烯对辉钼矿具有很好絮凝选择性，但其对浮选体系中微细辉钼矿的作用机理尚不明晰。因此，本项目针对聚氧化乙烯在微细辉钼矿浮选中表界面作用，研究聚氧化乙烯在辉钼矿不同解理面吸附行为及润湿响应，揭示其在辉钼矿不同解理面吸附差异，明晰其对辉钼矿不同解理面润湿影响；研究聚氧化乙烯作用下捕收剂在辉钼矿不同解理面铺展行为及作用，揭示其对捕收剂在辉钼矿不同解理面吸附的影响；研究聚氧化乙烯作用下辉钼矿不同解理面间作用力及絮凝响应，明晰辉钼矿絮体形成机制；研究聚氧化乙烯作用前后辉钼矿与气泡矿化过程，揭示辉钼矿矿化反应差异。本项目的研究可为低品位钼矿开发提供理论指导和方法借鉴，具有重要实践意义。

钼矿是我国战略矿产资源，储量较为丰富，但品位低于0.1%矿石占65%以上。随着钼需求量持续增大，低品位矿石开发迫在眉睫，而浮选效率低制约低品位钼矿开发。本项目基于辉钼矿各向异性特征，研究了不同辉钼矿颗粒的尺度效应，揭示了不同辉钼矿颗粒表面能、极性的演变规律；探究了烃类油捕收剂在辉钼矿不同晶面的吸附行为，揭示了微细辉钼矿疏水性降低和可浮性差原因；基于量子化学计算、分子动力学模拟与表面性质表征，以辉钼矿为目的矿物，高岭石和石英为脉石矿物，探究了聚氧化乙烯在辉钼矿、高岭石、石英表面的吸附行为，揭示了聚氧化乙烯在辉钼矿不同晶面的吸附及表面润湿响应差异；基于聚氧化乙烯作用下辉钼矿间及与脉石间作用力、絮体的絮凝-分散-再絮凝行为以及聚氧化乙烯在辉钼矿浮选过程作用机制，提出了基于颗粒间作用力的流体流动强化微细辉钼矿选择性絮凝-浮选的方法，并实现工程应用；针对常规烃类油捕收剂捕收能力不足问题开发了煤焦油基复合烃类油捕收剂，显著提高了微细粒辉钼矿浮选指标，有待进一步开发与推广。相关研究成果和应用通过中国有色金属工业协会技术鉴定1项，鉴定为“国际领先”水平；相关研究成果在Minerals Engineering、Minerals、中国矿业大学学报、矿产综合利用等国内外学术期刊发表或接收学术论文5篇，其中SCI3篇，EI 1篇，申请发明专利2项，培养硕士研究生2名，1人晋升副教授，1人获江苏省科技副总。