充气搅拌预处理对黄铜矿和磁黄铁矿浮选分离的影响

Effect of Aerated Stirring Pretreatment on the Flotation Separation of Chalcopyrite and Pyrrhotite

为提高黄铜矿浮选中脱除磁黄铁矿的效果,本文研究了通过充气搅拌预处理的方法实现黄铜矿和磁黄铁矿的有效分离。主要考查了加药顺序、搅拌时间和充气量与黄铜矿回收率的关系。研究结果表明,先加药再充气调浆搅拌的效果要好于后先充气搅拌后加药的效果;充气量的增加有助于提高黄铜矿回收率,并且气量达到2 m3/h后回收率变化平缓;搅拌0~35 min内黄铜矿回收率随搅拌时间增加而增加,35 min时回收率达到极高,然后变化趋于平缓。以上现象可能的原因是,磁黄铁矿的氧化消耗了矿浆中的氧气,从而造成矿浆中没有足够的氧来参与黄药与黄铜矿的吸附过程。矿浆中充入空气后,空气中的氧参与了磁黄铁矿的表面氧化,从而保证了矿浆中有足够的氧来参与黄药在黄铜矿表面的吸附过程,进而提高了黄铜矿的回收率。

Aerated stirring pretreatment to achieve effective flotation separation of chalcopyrite and pyrrhotite has been studied in this paper.It is mainly investigated the relationship between the dosing sequence,mixing time and aeration rate and the recovery rate of chalcopyrite.The results of the study show that the effect of adding chemicals before aerated stirring is better than that of adding chemicals after aerated stirring;the increase of aeration rate helps to increase the recovery rate of chalcopyrite,and the recovery rate changes gentle after the rate reaches 2 m3/h;the recovery rate of chalcopyrite increases with the increase of stirring time within 0~35 min of stirring,and the recovery rate reaches highest at 35 min and then tends to be gentle.The possible reason for the analysis of the above phenomenon is that the oxidation of pyrrhotite consumes the oxygen in the pulp,resulting in insufficient oxygen in the pulp to participate in the adsorption process of xanthate on chalcopyrite surface.After the slurry is filled with air,the oxygen in the air participates in the surface oxidation of pyrrhotite,thereby ensuring that there is enough oxygen in the slurry to participate in the adsorption process of xanthate on the surface of chalcopyrite,thereby increasing the chalcopyrite’s recovery rate.