摘要
我国钒钛磁铁矿资源丰富,但综合利用难度大,现有工艺仍存在一些问题,工艺流程还有待完善和革新。气基竖炉直接还原-电炉熔分新工艺为钒钛磁铁矿资源清洁高效综合利用提供了新途径。以含钒钛的铁精矿为原料制备氧化球团,模拟气基竖炉直接还原条件,研究了还原气组分和温度对球团的还原进程、还原膨胀以及还原强度的影响。结果表明:以钒钛铁精矿为原料,配加1%膨润土,在1 250℃下焙烧20 min后,所制备氧化球团性能良好,具有较高的抗压强度。在恒定还原气组分(纯H2、H2/CO=2.5、H2/CO=1、H2/CO=0.4和纯CO)和温度(850、900、950和1 000℃)下,钒钛铁精矿球团还原速率快、还原膨胀率小(<20%),可满足气基竖炉直接还原工艺要求。煤制气-气基竖炉直接还原凭借其能耗小、环境友好、单机产能大、产品质量好等优点,将在钒钛磁铁矿资源高效清洁综合利用领域得到发展。
Vanadium-bearing titanifemus magnetite resources are abundant in China, but most of them are difficult to be utilized efficiently because of current technical problems with industrial practice, so further efforts should be made to innovate existing technologies. The process of direct reduction by gas-based shaft furnace-smelting and separation by electric furnace provides a new way to efficiently and cleanly utilize the resources. In the experiment, oxidized pellets are prepared from vanadium and titanium-beating iron concentrates. By simulating direct reduction conditions of gas-based shaft furnace, the effects of reducing gas composition and temperature on pellets＇ reduction course, swellability and intensity have been investigated.The results shows that the oxidized pellets prepared from vanadium and titanium-bearing iron concentrates （1% of bentonite is added into it） roasted at 1 250 ℃ for 20 min exhibit excellent properties and possess high compressive strength. Under controlled experimental conditions including composition of reducing gas （pure H2, H2/CO = 2.5, H2/CO =1, H2/CO =0.4 and pure CO） and temperature （850 ℃, 900 ℃, 950 ℃ and 1 000 ℃）, the resulted pellets boast fast reaction rate and small reduction swellability and can meet the requirements of direct reduction in shaft furnace. Thanks to its advantages in energy saving, environment protection, greater singlemachine capacity and high product quality, the process of coal gasification-direct reduction by shaft furnace is expected to be developed aiming at efficient and clean utilization of vanadium-bearing titaniferous magnetite.
出处
《钢铁钒钛》
CAS
北大核心
2012年第2期34-39,共6页
Iron Steel Vanadium Titanium
基金
国家自然科学基金重大项目(51090384)
中央高校基本科研业务费资助项目(N090602005)
关键词
钒钛磁铁矿
氧化球团
直接还原
竖炉
vanadium-bearing titaniferous magnetite
oxidized pellets
direct reduction
shaft furnace
作者简介
王兆才（1983-），男，甘肃武威人，东北大学博士研究生，主要从事球团直接还原及炼铁资源综合利用研究。
储满生（1973-），男，安徽岳西人，东北大学教授，博士生导师，主要从事低碳高炉炼铁、直接还原与熔融还原、冶金资源综合利用等领域的研究；
