摘要
针对电炉冶炼钒钛矿渣中含有TiC导致渣金分离效果差的问题,本文提出碳热预还原-硅热还原熔分新方法,即在还原工艺后期,采用硅代替碳进行还原反应,以避免TiC的生成,并进行了条件试验及产物和炉渣检测分析。碳热预还原条件试验表明,通过控制反应时间和配碳量(1.6倍~1.9倍理论配碳)可在1200℃下获得低碳(C=0.12%~0.22%)预还原产物。硅热还原熔分条件试验表明,V收率随着Si配比增加而增大,Fe收率随Si配比增加而增大;相同Si配比条件下,预还原阶段C配比越低,Fe收率越低,V收率越高;Si配比增加至1.8Si时,不同碳配比条件下V收率为77.71%~81.62%,Fe收率为97.23%~99.89%,而且渣金分离效果良好。炉渣X射线衍射图谱表明,炉渣中主要物相为钛酸铝镁(Mg_(4)Al_(2)Ti_(9)O_(25))和镁铝尖晶石(MgAl_(2)O_(4)),不含TiC;根据图谱分析和能谱分析,推算得出随着Si配比的增加,渣中TiO_(2)品位上升,1.8Si配比时渣中TiO_(2)品位可以控制在27.28%~34.86%。该方法采用Si代替C进行深度还原,显著提升V收率,多回收的钒可弥补硅消耗带来的成本增加,且潜在经济效益显著。
Aiming at the poor separation effect of metal from slag because of TiC in slag in the process of titanomagnetite smelting in electric furnace,a new method of carbothermal pre-reduction-silicothermal reduction melting separation is proposed in this paper.That is in the later stage of the reduction process,silicon was used instead of carbon for reduction reaction to avoid the formation of TiC,and the condition test and product and slag detection analysis were carried out.The condition tests of carbon thermal pre-reduction show that low carbon(C=0.12%~0.22%)products can be obtained at 1200℃by controlling reaction time and carbon content(1.6~1.9 times of theoretical carbon ratio).The condition tests of siliconthermal reduction smelting show that the yield of V increases with the increase of Si ratio,and the yield of Fe increases with the increase of Si ratio.Under the same Si ratio,the lower the C ratio in the pre-reduction stage,the lower the Fe yield and the higher the V yield.When the Si ratio is increased to 1.8 Si,the V yield is 77.71%~81.62%and the Fe yield is 97.23%~99.89%under different carbon ratios,and the separation effect of metal from slag is good.Slag X-ray diffraction spectrum shows that the main phases in the slag are magnesium aluminum titanate(Mg_(4)Al_(2)Ti_(9)O_(25))and magnesium aluminum spinel(MgAl_(2)O_(4)),without TiC.According to the spectrum and energy spectrum,it is calculated that with the increase of Si ratio,the content of TiO_(2) in slag increases,which can be controlled at 27.28%~34.86%when the ratio of Si is 1.8.This method uses Si instead of C for deep reduction,which significantly improves the yield of V.The recovered vanadium can make up for the cost caused by silicon consumption,and the potential economic benefits are significant.
作者
李东波
王云
张国华
魏甲明
王红阳
郭亚光
高永亮
崔健
LI Dong-bo;WANG Yun;ZHANG Guo-hua;WEI Jia-ming;WANG Hong-yang;GUO Ya-guang;GAO Yong-liang;CUI Jian(China ENFI Engineering Corporation,Beijing 100038,China;University of Science and Technology Beijing,State Key Laboratory of Advanced Metallurgy,Beijing100083,China)
出处
《中国有色冶金》
CAS
北大核心
2022年第5期52-61,共10页
China Nonferrous Metallurgy
基金
中冶集团“181攻关计划”-高效短流程非高炉炼铁
院士工作站合作研发项目(ENFIBMGGG10P088)。
关键词
钒钛矿
碳热还原
硅热还原
钒
碳配比
硅配比
炉渣物相
TIC
vanadium titanomagnetite
carbothermic reduction
silicothermic reduction
vanadium
carbon ratio
silicon ratio
slag phase
TiC
