蛇纹石浓度对黄铜矿矿浆流变性和浮选的影响

Effect of Serpentine Content on Rheological Properties and Flotation of Pulp

在蛇纹石-滑石型硫化矿中,脉石矿物蛇纹石因质地软,硬度小,在磨矿过程中易泥化,从而产生大量微细粒蛇纹石。微细粒蛇纹石不仅能影响硫化矿的可浮性,而且在浮选过程中也容易导致矿浆流变性变得更加复杂。为了充分了解蛇纹石对矿浆流变性和矿物浮选行为的影响,采用DLVO理论计算、流变性测量、浊度测试和浮选试验的方法进行系列试验。结果表明:蛇纹石质量浓度的升高增大了混合矿矿浆表观黏度值,导致蛇纹石泡沫夹带量增加,黄铜矿浮选速率下降,最终精矿MgO含量升高。而这主要由颗粒间的总相互作用力增强导致的:蛇纹石颗粒间的相互吸引力远大于蛇纹石和黄铜矿颗粒间的吸引力,随着蛇纹石质量浓度的升高,矿浆中颗粒总相互凝聚力增强,导致矿浆黏度升高。

In the serpentin-talc type sulfide ore,the gangue mineral serpentine has a soft texture,low hardness,and is easily muddled during the grinding process,resulting in a large amount of fine-grained serpentine. Fine-grained serpentine can not only affect the floatability of sulfide ores,but also easily cause pulp rheology to become more complicated during the flotation process. In order to fully understand the effect of serpentine on the rheology and mineral flotation behavior of pulp,DLVO theoretical calculations,rheological measurements,turbidity test and flotation tests were used to test chalcopyrite slurry. The results show that the increase of serpentine concentration increases the apparent viscosity value of mixture slurry,leading to an increase in the entrained amount of serpentine foam,a decrease in the flotation rate of chalcopyrite,and an increase in the final concentrate MgO. This is mainly due to the increase in the total interaction force between the particles: the mutual attraction between the serpentine particles is much greater than the attraction between the serpentine and chalcopyrite particles. As the concentration of serpentine increases,the particles in the slurry always increase their cohesion,resulting in an increase in the viscosity of the slurry.