内配废塑料高磷铁矿含碳团块直接还原—磁选研究
发布时间：2019-04-08 08:15
【摘要】：随着近年来钢铁行业的急剧发展,粗钢产量的不断增长,2016年我国铁矿石进口量已达10.24亿吨,但我国储量巨大的高磷铁矿资源依旧没有得到大规模经济高效的开发利用。本文对内配废塑料高磷铁矿含碳团块进行直接还原-磁选研究,并研究了高磷铁矿含碳团块的直接还原机理,为我国高磷铁矿开发利用提供理论支撑。实验研究结果表明:在团块碱度0.8,添加4%硫酸钠,焦粉用量16%的实验条件下,添加废塑料替代25%焦粉(总含C量为13.19%)的团块在1150 ℃还原40 min,可得到金属化率为88.77%的焙烧团块,还原后的团块在磨矿细度-0.074 mm占90%,磁选强度0.08 T的实验条件下,磁选可得到铁品位为91.99%,金属化率为92.26%的金属铁粉,铁回收率可达86.74%。基准条件,添加4%硫酸钠和添加4%硫酸钠同时废塑料替代25%焦粉三种条件下焙烧团块的微观结构研究结果表明:硫酸钠可强化高磷铁矿在直接还原过程中铁晶粒的迁移,聚集长大,可以有效的使铁得以富集;添加废塑料替代25%焦粉后,直接还原过程中铁晶粒迁移聚集效果良好。能谱分析结果表明,与基准条件相比,添加硫酸钠后金属铁晶粒中为纯净金属Fe元素,添加4%硫酸钠同时添加废塑料替代25%焦粉后金属铁晶粒中出现少量P元素。在还原温度1000 ℃-1150 ℃,还原时间40 min,N2/CO2为14/1的气体条件下,基准条件、添加4%硫酸钠和添加4%硫酸钠同时废塑料替代25%焦粉三种条件下含碳团块还原动力学表明,其还原的限制性环节均为气体扩散,还原反应表观活化能分别为240.92 kJ/mol、158.81kJ/mol和172.89 kJ/mol。加入硫酸钠后,降低了表观活化能,促进了还原反应的进行,添加废塑料替代25%焦粉后,表观活化能有所升高,不利于还原反应的进行。
[Abstract]:With the rapid development of iron and steel industry in recent years and the continuous growth of crude steel output, China's iron ore import volume in 2016 has reached one billion twenty four million tons, but the huge reserves of high phosphorus iron ore resources in our country still have not been developed and utilized on a large scale economically and efficiently. In this paper, the direct reduction-magnetic separation of carbon-bearing pellets of waste plastic high-phosphorus iron ore is studied, and the direct reduction mechanism of carbon-bearing pellets of high-phosphorus iron ore is studied, which provides theoretical support for the development and utilization of high-phosphorus iron ore in China. The experimental results show that under the conditions of the basicity 0.8, the addition of 4% sodium sulfate and the amount of coke powder 16%, adding waste plastic instead of 25% coke powder (the total content of C is 13.19%) can be reduced to 40 min, at 1150 鈩，
本文编号：2454425
[Abstract]:With the rapid development of iron and steel industry in recent years and the continuous growth of crude steel output, China's iron ore import volume in 2016 has reached one billion twenty four million tons, but the huge reserves of high phosphorus iron ore resources in our country still have not been developed and utilized on a large scale economically and efficiently. In this paper, the direct reduction-magnetic separation of carbon-bearing pellets of waste plastic high-phosphorus iron ore is studied, and the direct reduction mechanism of carbon-bearing pellets of high-phosphorus iron ore is studied, which provides theoretical support for the development and utilization of high-phosphorus iron ore in China. The experimental results show that under the conditions of the basicity 0.8, the addition of 4% sodium sulfate and the amount of coke powder 16%, adding waste plastic instead of 25% coke powder (the total content of C is 13.19%) can be reduced to 40 min, at 1150 鈩，
本文编号：2454425
本文链接：https://www.wllwen.com/kejilunwen/kuangye/2454425.html
