钛铁矿精矿碳热还原制取碳氧化钛(TiCxO1-x)物相演化机理研究  

Preparation of Titanium Oxycarbide(TiCO)and the Phase Evolution Mechanism of Carbothermal Reduction Ilmenite Concentrate

作　　者：戴蔚 何春林 郑春慧 韦悦周 李杰[1] 赵健 Dai Wei;He Chunlin;Zheng Chunhui;Wei Yuezhou;Li jie;Zhao Jian(School of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials,Nanning 530004,China;School of Nuclear Science and Engineering,Shanghai Jiaotong University,Shanghai 200240,China)

机构地区：[1]广西大学资源环境与材料学院,广西南宁530004 [2]广西有色金属及特色材料加工重点实验室,广西南宁530004 [3]上海交通大学核科学与技术学院,上海200240

出　　处：《金属矿山》2020年第8期69-75,共7页Metal Mine

基　　金：广西科技重大专项(编号:桂科AA18118030);国家自然科学基金项目(编号:51804084,51774099)。

摘　　要：基于USTB工艺,以广西某钛业公司的浮选钛铁矿精矿为研究对象,研究钛铁矿精矿直接碳热还原制取碳氧化钛(TiCxO1-x)机理和物相变化过程。采用XRD、SEM-EDS和HSC热力学软件对碳热还原产物及反应过程进行分析,结果表明:随着碳配比量的增加,还原过程物相主要为:FeTi2O5、Ti2O3、TiO、TiCxO1-x、TiC;当石墨的配比质量分数为2.2.92%~2.6.61%时,1550℃氩气气氛下还原4 h可得到TiCxO1-x;结合反应热力学和物相分析结果可知,整个还原过程主要是固相C参与还原,CO还原作用小,还原过程物相演化规律为:FeTiO3→FeTi2O5→Ti2O3+Fe→TiO+Fe→TiCxO1-x+Fe。在1550℃下,反应生成TiC过程主要是固相碳起还原作用,CO无法起到还原作用;生成碳氧化钛TiCxO1-x的ΔG^■介于TiC和TiO之间,属于不完全还原状态,主要通过控制碳配比量在反应温度内即可还原得到碳氧化钛。Based on the USTB process,an ilmenite concentrate,which was taken from a titanium company in Guangxi,was used as raw materials to produce titanium oxycarbide(TiCxO1-x)by direct carbothermal reduction and the mechanism and phase change process were investigated.The carbothermal reduction products and reaction process were analyzed by XRD,SEM-EDS and HSC thermodynamic software.The results show that the main phases of the reduction process were:FeTi2 O5,Ti2 O3,Fe,TiO,TiCxO1-x,TiC.With 22.92%~26.61%of graphite,TiCxO1-x was obtained after 4 h of reduction in argon at 1550℃.The reaction thermodynamics and phase analysis showed that the whole reduction was mainly involved by solid carbon,and the reduction capacity of CO was weak,and the phase evolution law was:FeTiO3→FeTi2 O5→Ti2 O3+Fe→TiO+Fe→TiCxO1-x+Fe.In process of generating TiC,solid carbon plays a reduction role,while CO cannot under 1550℃.The ΔG^■of TiCxO1-x is between TiC and TiO.It’s an incomplete reduction state.Therefore,TiCxO1-x could be obtained by controlling the carbon ratio at the temperature of titanium oxycarbide.

关 键 词：钛铁矿 碳热还原 碳氧化钛 金属钛 

分 类 号：TD925[矿业工程—选矿]