鄂西高磷鲕状赤铁矿矿浆粘度影响因素研究

Research on the Influence Factors for Viscosity of High Phosphorus Oolitic Hematite of Western Hubei

为了给研究如何提高鄂西高磷鲕状赤铁矿的超细磨效率提供参考,考察了矿石细度、矿浆浓度、矿浆温度及剪切率对鄂西高磷鲕状赤铁矿矿浆粘度的影响。结果表明:鄂西高磷鲕状赤铁矿的矿浆粘度随矿浆浓度提高和矿石细度变细呈指数关系上升。矿石较粗时,温度对矿浆粘度影响较小;矿石变细后,矿浆粘度随温度升高逐渐呈直线下降趋势。随着剪切率的提高,矿浆的粘度不断下降,而且在剪切率提高的初期下降幅度很大。根据试验结果,认为对鄂西高磷鲕状赤铁矿进行超细磨时,矿浆浓度不宜超过50%,同时适当提高磨机的转速将有利于降低矿浆粘度,提高磨矿效率。

In order to provide a reference for studying how to improve ultrafine grinding efficiency of high phosphorus oolitic hematite in western Hubei province,the influences of ore fineness,pulp density,pulp temperature and shear rate to the viscosity of high phosphorus oolitic hematite were investigated.The results showed that the slurry viscosity of high phosphorus oolitic hematite increased with the concentration of the slurry raised and mineral particle fining exponentially.For the coarse ore,the temperature had less effect on the slurry viscosity;For the fine ore,the slurry viscosity declined linearly with temperature gradually increased.As the shear rate increased,the slurry viscosity fell and dropped greatly at the early stages of shear rate decrease.The test results indicated that when the high phosphorus oolitic hematite was ground to be ultra-fine,it is not suitable for exceeding to 50% for the slurry concentration.Meanwhile appropriate increase of the grinding speed will help to reduce the slurry viscosity and improve grinding efficiency.