摘要
为考察高炉灰作为还原剂用于高磷鲕状赤铁矿石还原焙烧的可能性,以鄂西某铁品位为42.72%的鲕状赤铁矿石和河北某铁品位为23.96%、固定碳含量为32.83%的高炉灰为原料,进行了共还原焙烧回收铁试验。结果表明:在高炉灰用量为30%、共还原焙烧温度为1 150℃、焙烧时间为60 min、还原产品磨矿细度为-0.043 mm占96%、磁选磁场强度为87.58 k A/m条件下,可获得铁品位为91.88%、回收率为88.38%、磷含量为0.072%的还原铁。不同高炉灰用量下焙烧产品的XRD分析结果表明:随高炉灰用量的增加,铁的衍射峰逐渐增强,增加高炉灰用量有利于含铁矿物被还原成金属铁,但还原铁产品磷含量也升高。高炉灰作为还原剂用于高磷鲕状赤铁矿共还原焙烧,为高效利用高炉灰和难选铁矿石提供了一种新思路,又可以降低鲕状赤铁矿石直接还原焙烧的成本,同时减轻高炉灰对环境的污染,具有较高的经济和环境效益。
In order to find the possibility of blast furnace dust as reducing agent in high phosphorus oolitic hematite reduction roasting,coreduction roasting experiments were conducted on a oolitic hematite ore with 42. 72% iron from Western Hubei and a blast furnace dust with 23. 96% iron,32. 83% fixed carbon as raw material. Results show that with the conditions of the blast furnace dust dosage of 30%,coreduction roasting temperature of 1 150 ℃,roasting time of 60 min,grinding fineness for reduction product is 96%-0. 043 mm,magnetic field intensity is 87. 58 k A / m,DRI with 91. 88% iron,0. 072% phosphorus and iron grade of 88. 38% was obtained. XRD analysis results on different dosage of blast furnace dust calcined product show that with the increase dosage of the blast furnace dust,iron diffraction peak strengthen gradually. Increase the dosage of blast turance is beneficial for iron bearing minerals reduction to metallic iron,while phosphorus in DRI also increased. Blast furnace dust as a reducing agent for high phosphorus oolitic hematite reduction roasting,provides a new method in efficient utilization of blast furnace dust and refractory iron ore,and can reduce the cost of oolitic hematite direct reduction roasting,at the same time reduce the blast furnace dust pollution to the environment,has high economic and environmental benefits.
出处
《金属矿山》
CAS
北大核心
2015年第10期67-70,共4页
Metal Mine
基金
国家自然科学基金重点项目(编号:51134002)
关键词
高炉灰
高磷鲕状赤铁矿
共还原焙烧
Blast furnace dust
High phosphorus oolitic hematite
Coreduction roasting
