赤铁矿制备镁球团矿的研究与应用  

Preparation and application of magnesium pellets using hematite

作　　者：王代军[1,2,3] 吴胜利[1,2] 

机构地区：[1]北京科技大学高效钢铁冶金国家重点实验室,北京100083 [2]北京科技大学冶金与生态工程学院,北京100083 [3]北京首钢国际工程技术有限公司,北京100043

出　　处：《钢铁》2015年第10期19-25,29,共8页Iron and Steel

摘　　要：在高炉冶炼过程中,MgO有利于防止球团矿与球团矿之间、球团矿与烧结矿、块矿之间的熔融黏结、降低料层阻力损失、降低软融带的高度及提高煤气利用率。以蛇纹石作为含镁添加剂,研究其对赤铁矿球团成球性能、预热和焙烧性能的影响。冷态性能研究结果表明:随着蛇纹石质量分数增加,生球水分逐渐增加,生球的抗压强度提高,而落下强度和爆裂温度降低。预热性能研究结果表明:最佳预热温度为1 000℃,最佳预热时间为8 min,蛇纹石质量分数为1.40%时预热球抗压强度值最好。焙烧性能研究结果表明:最佳焙烧时间为12 min,焙烧温度以1 280℃为宜。工业试验表明:成品球团矿铁品位及还原度降低但是综合品位w(TFe)+w(MgO)提高,还原膨胀率减小,软化开始温度升高,软化结束温度降低,球团矿的高温冶金性能得到改善。成本分析表明:镁球团矿原料成本降低。高炉应用效果表明:铁水质量得到改善,铁水合格率达到99.97%,一级品率达到75.06%,炉渣中w(MgO)增至8.10%,w(Al2O3)降低至14.72%,w(MgO)/w(Al2O3)上升至0.55。In the blast furnace smelting process,MgO can prevent the melt bond between pellets and pellets,pellets and sinter ore and iron ore,reduce the loss of material layer resistance,reduce the height of the soft melting belt and improve gas utilization rate. The effects of serpentine as magnesium additives on the balling property,preheating and roasting properties of hematite pellets are studied in the research. The results of cold state performance study show that：with the increasing ratio of serpentine,green balls moisture content are increased gradually,the compressive strength of green balls are improved,and falling strength and bursting temperature are decreased. The results of preheating performance study show that：the optimum preheating temperature is 1 000 ℃,the optimum preheating time is 8 min,when the dosage of serpentine is 1.40%,and the compressive strength of preheating balls is the best. The results of roasting performance study show that：the optimum calcination time is 12 min,and the calcination temperature is 1 280 ℃. The industrial tests show that：the iron grade and reduction degree of finished pellets are reduced. But the comprehensive grade w（TFe）＋w（MgO） is increased,the reduction swelling is reduced,softening started temperature is elevated,the end of soften temperature is reduced,high temperature metallurgical properties is improved. Cost analysis shows that：the raw material cost magnesium pellets is reduced. The effects of blast furnace show that：the quality of molten iron is improved,the qualified rate of molten iron reaches 99.97%,the grade of product reaches 75.06%,the content of w（MgO） in slag increases to 8.10%,the content of w（Al2O3） is decreased to 14.72%,and the ratio of w（MgO）/w（Al2O3） is increased to 0.55.

关 键 词：赤铁矿 蛇纹石 带式焙烧机 抗压强度 冶金性能 

分 类 号：TF046.6[冶金工程—冶金物理化学]