聚乙烯塑料–煤粉与铁精矿混合球团性能研究

Research on the Performance of Iron Ore Pellets Containing Coal and Polyethylene

采用煤粉混合聚乙烯废塑料与铁精矿制备含碳球团,对所得混合含碳球团特性进行了试验研究。结果表明,在一定的物料粒度、水分含量、膨润土加入量条件下,配加聚乙烯塑料的混合含碳球团的冷态性能增强,塑料加入量越多,球团冷态强度越好,以干球强度提高更为明显。焙烧还原后,1:1的聚乙烯煤粉混合还原剂球团(或1:2)比煤粉球团强度增强,且对还原后的球团进行矿相分析发现,配加聚乙烯塑料能够改善自还原过程的热质条件,促进还原反应的进行,且还原区域集中在聚乙烯塑料颗粒周围。

Experimental researches on characteristics of the mixed pellets containing carbon which are made from pulverized coal mixed with polyethylene plastic and iron ore were carried out. The results show that under certain material particle size, moisture content percent and certain amount of bentonite conditions, cold state performance of pellets containing carbon mixed with addition of polyethylene plastic is reinforced, meaning that the more amount of plastic added in the mixed pellets, the better the cold strength to increase the strength of the dry bulb apparently. After the roasting reduction, strength of pulverized reductant polyethylene pellets with mixed rates of 1:1 (or 1:2) is better than that of pulverized coal pellet, and mineralogical analysis on polyethylene pellets shows that the addition of polyethylene plastic can improve the conditions of the reducing process heat and promote the reducing reaction, and the reducing area concentrates around the polyethylene plastic particles.