Effect of wetting degree of vanadium-titanium-iron concentrate on mechanical activation in high pressure roller grinding
High pressure roller grinding(HPRG)pretreatment can improve the quality of pellets,but its mechanical activation effect is affected by many parameters.The effects of HPRG pretreatment on the properties,pelletizing and roasting properties of vanadium-titanium-iron concentrate under different water contents were studied,and the suitable wetting degree for mechanical activation of vanadium-titanium-iron concentrate by HPRG pretreatment was determined.The results show that when the water content increases from 5.5 wt.％to 8.5 wt.％,the particle size of vanadium-titanium-iron concentrate decreases firstly and then tends to be stable after HPRG pretreatment,the specific surface area increases,and the hydrophilicity and billability are enhanced.However,the increase of water content is not conducive to the dissociation between iron ore and gangue,and the mineral liberation degree of titanomagnetite decreases.When the water content is 6.5 wt.％-7.5 wt.％,the mechanical activation of HPRG is the strongest.At this time,the grain size of titanomagnetite is the smallest,the lattice distortion rate is the largest,and the quality index of the prepared vanadium-titanium-iron concentrate pellets is the best.The suitable water content of vanadium-titanium-iron concentrate in HPRG pretreatment is 6.5 wt.％-7.5 wt.％.Correspondingly,the vanadium-titanium-iron concentrate needs to be wetted to a capillary water content of 4.4 wt.％-5.4 wt.％before HPRG pretreatment.
万方数据
维普
