铁精矿粒度对球团强度的影响

以大红山、曼南坎和滇滩等精矿的粒度以及膨润土用量和润磨时间为因子,以生球落下强度、生球爆裂温度、预热球抗压强度和焙烧球抗压强度为评价指标,进行了五因子二次回归组合实验研究。结果表明:随着铁精矿小于0.074mm粒级含量的增加,生球爆裂温度下降,预热球和焙烧球抗压强度提高;当铁精矿小于0.074mm粒级含量小于75%(质量分数)时,生球落下强度逐渐上升,当小于0.074mm粒级含量为75%时,生球落下强度达到最大值,之后有下降趋势。并不是铁精矿粒度越细球团强度就会越好,铁精矿粒度还应该满足一个合适的粒度组成。

Effect of particle size distribution of concentrate on palletizing quality

Orthogonal experiments were done by using different size distribution of Dahongshan concentrate, Mannankan concentrate, Diantan concentrate, bentonite dosage and time of damp milling and so on as factors, and the drop strength of green pellet, shock temperature of green pellet, compression strength of preheat pellet, compression strength of backing pellet as evaluating index. The results show that as the content of less than 0. 074 mm grade iron concentrate increases, the shock temperature of green compression decreases~ the strength of preheated pellet and the compression strength of backing pellet are improved; the drop strength of green pellet of iron concentrate increases when the content of less than 0. 074 mm grade iron concentrate is lower than 75% ; when the content of less than 0. 074 mm grade iron concentrate is 75 %, the drop strength of green pellet of mixed material is maximum. It can be concluded that the palletizing quality does not become better throughout as iron concentrate size decreases, actually iron concentrate should have a good size distribution.