摘要
研究了钛铁矿煤基包埋法直接还原铁同步制备钛酸钙过程中钛的物相转化和钛酸钙的生成机制,阐明了添加剂碳酸钙用量和焙烧温度等因素对还原铁和钛酸钙的影响规律和作用机理。结果表明,含60%碳酸钙的钛铁矿生球团在1400℃下煤基包埋法恒温焙烧180 min,可以在制得直接还原铁的同时使钛以纯钛酸钙的形式产出。在添加剂碳酸钙的作用下,焙烧温度>1300℃时,钛酸钙开始作为主要含钛物相产出,试验得出的最佳焙烧温度为1400℃。随着碳酸钙用量的增加,焙烧产物中黑钛石的含量逐渐减少,钛酸钙的含量逐渐增多。但是碳酸钙用量大会导致还原铁颗粒变细,不利于后续的磨矿磁选分离。实验室条件下通过两段磨矿磁选最终获得还原铁产品TFe品位为81.86%、回收率为91.27%,钛酸钙产品中Ti品位为26.95%、钛酸钙含量为76.37%,钛的回收率为90.15%。
The paper studied the phase transformation of titanium and the formation mechanism of calcium titanate during the simultaneous preparation of calcium titanate by direct reduction of iron from ilmenite coal-based embedding method,and clarified the influence of additives such as calcium carbonate dosage and roasting temperature on reduced iron and titanium.The influence law and mechanism of calcium acid.The results show that the raw ilmenite pellets containing 60%calcium carbonate are roasted at a constant temperature of 1400℃for 180 min by the coal-based embedding method,which can produce direct reduced iron while simultaneously producing titanium in the form of pure calcium titanate.Under the action of the additive calcium carbonate,when the calcination temperature is>1300℃,calcium titanate begins to be produced as the main titanium-containing phase,and the best calcination temperature obtained by the experiment is 1400℃.As the amount of calcium carbonate increases,the content of black titanite in the calcined product gradually decreases,and the content of calcium titanate gradually increases.However,the large amount of calcium carbonate causes the reduced iron particles to become finer,which is not conducive to the subsequent grinding and magnetic separation.Under laboratory conditions,the TFe grade of the reduced iron product is 81.86%and the recovery rate is91.27%.The grade of Ti in the calcium titanate product is 26.95%,the content of calcium titanate is76.37%and the recovery rate of titanium is 90.15%.
作者
李刚
寇珏
孙体昌
李小辉
Li Gang;Kou Jue;Sun Tichang;Li Xiaohui(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Faculty of Culture and Tourism,Qujing Normal University,Qujing 655011,Yunnan,China)
出处
《钢铁钒钛》
CAS
北大核心
2021年第4期23-32,共10页
Iron Steel Vanadium Titanium
基金
国家自然科学基金(51674018)资助项目。
关键词
钛铁矿
直接还原
煤基包埋法
焙烧
钛酸钙
还原铁
ilmenite
direct reduction
coal-based embedding method
roasting
calcium titanate
reduced iron
