低质含镁原料制备碱性球团试验研究

Experimental Study on Preparation of Alkaline Pellets with Low-Quality Magnesium-Containing Raw Materials

为查明利用低质含镁熔剂生产碱性球团的可行性,以武钢资源集团乌龙泉矿白互、轻烧料和轻烧白云石为镁质熔剂,通过造球、预热和焙烧试验,研究镁质熔剂种类及用量对成球行为、碱性球团预热、焙烧过程的影响。结果表明,使用白互熔剂为镁质熔剂时生球性能较优,碱度0.8时,两种配矿方案生球落下和抗压强度分别为4.1次/0.5 m和20.3 N/个、6.6次/0.5 m和22.3 N/个。各方案预热球强度、焙烧球强度随着镁质熔剂添加量增加呈先上升后下降的趋势,碱度0.6~0.8时,分别达到2620 N/个、2963 N/个。推荐白互和轻烧料作为镁质熔剂,碱度0.6~0.8时,可生产出满足工业要求的镁质碱性球团矿。

In order to identify the feasibility of preparing alkaline pellets with low-quality magnesium-containing flux,experiments on pelletizing,preheating and roasting were carried out.Three kinds of magnesium-containing flux from Wulongquan Mine of WISCO Resources Group Co.,Ltd.,including interbedded dolomite,light-burnt material and light-burnt dolomite,were taken for pelletizing,and then effects of different magnesia flux and the adding amount on pelleting,as well as following preheating and roasting processes of alkaline pellet were all explored.The results show that the green ball prepared with the flux of interbedded dolomite presents superior performance.It is found that with alkalinity of 0.8,the green ball prepared with two different blending schemes have drop number of 4.1 and 6.6 respectively from height of 0.5 m,and compressive strength of 20.3 N/pellet and 22.3 N/pellet respectively.By increasing the addition of magnesia flux in two blending schemes,both preheated balls and roasted balls have their strength decreased after an initial improvement.With alkalinity between 0.6 and 0.8,the prepared pellet can have compressive strength of 2620 N/pellet and 2963 N/pellet respectively after preheating and roasting process.It is recommended that with interbedded dolomite and light-burnt material as magnesia flux,the alkaline magnesium-containing pellet prepared with alkalinity of 0.6-0.8 can meet industrial requirements.