高压辊磨预处理对超细粒度磁铁精矿粉球团性能的影响

Effect of High Pressure Roll Grinding on Pellet Property of Super-Fine Magnetite Concentrate

某磁铁精矿粉粒度虽然非常细,小于0.044mm的比例达到88%,但由于该矿粉颗粒形貌为板状、片状结构,故为中等成球性能矿粉。采用高压辊磨对该矿粉进行预处理后,其颗粒形貌发生很大变化,造球性能得到改善,膨润土单耗降低,但生球爆裂温度有下降趋势;高压辊磨预处理铁矿粉后,对改善预热球团矿的抗压强度效果不明显,但成品球团抗压强度得到提高。研究结果表明,高压辊磨预处理对细粒度磁铁精矿粉的造球性能及成品球强度有明显的改善效果。

For one kind of super fine magnetite concentrate with about 88% of particle size less than 0.044 mm,its ballability was middle classs because of plate and plate-like structure.However,particle morphology of concentrates was changed and balling performance was improved after concentrates pretreated by HPRG,which resulted in the decrease of the bentonite addition rate and breakdown temperature of green pellets.The results show that the compression strength of finished pellets increases markedly after pretreated by HPRG,but no obvious effect is observed on the changes of compression strength of preheated pellets.The whole experiment indicates that the balling performance can be improved and compression strength of finished pellets can be increased after the super fine magnetite concentrate pretreated by HPRG.