微细粒辉钼矿的浮选动力学研究

来源期刊:中南大学学报(自然科学版)2018年第7期

论文作者:顾帼华 林清泉 陈雄 邓莎 许宝科 李丽娟

文章页码:1573 - 1582

关键词:微细粒;辉钼矿;浮选动力学;浮选速率常数;疏水聚团

Key words:fine particles; molybdenite; flotation kinetics; flotation rate constant; hydrophobic agglomeration

摘    要:采用一级动力学模型研究粒度低于38 μm的微细粒辉钼矿在不添加或者添加柴油时的浮选动力学。研究结果表明:不添加柴油时微细粒辉钼矿的浮选速率常数小,浮选回收率低;而在添加柴油的体系中,柴油用量的增加可以增大疏水团聚体的粒径,提高浮选速率常数,从而增大微细粒辉钼矿的浮选效率;矿浆pH对微细粒辉钼矿浮选速率的影响较大,在酸性和中性pH条件下,辉钼矿的浮选速率常数明显大于碱性条件下的速率常数;在柴油体系中,降低pH会促进辉钼矿颗粒的聚集行为,但聚集程度增加不大,从而引起辉钼矿浮选回收率增加不明显;适当增大搅拌转速也可以促进微细粒辉钼矿的聚团行为,增大团聚体的平均粒径,提高其浮选速率常数和浮选回收率;微细粒辉钼矿与柴油油滴之间相互作用力以疏水引力为主。

Abstract: The flotation kinetics of molybdenite fines (lower than 38 μm) with and without the presence of diesel oil was investigated by first-order kinetic equation. The results show that in the absence of diesel oil, the flotation rate constant and flotation recovery of fine molybdenite are low, while the addition of diesel oil can significantly improve the flotation efficiency of molybdenite by increasing the size of hydrophobic agglomerates and enhancing the flotation rate constant. The pulp pH also affects the flotation rate of fine molybdenite. Under the condition of acidic and neutral pH, flotation rate constant of molybdenite is significantly greater than that of alkaline condition. In the presence of diesel oil,lower pH can accelerate the aggregation behavior of molybdenite particles, while modest increase of aggregation degree can slightly increase the flotation recovery of molybdenite fines. A suitable increase in stirring speed is conducive to hydrophobic agglomeration of molybdenite, which increases the agglomerates size, flotation rate constant and flotation recovery. Moreover, the hydrophobic attractive force between diesel oil drop and molybdenite is the main driving force resulting in the collection effect.

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