【作者】 徐宝强； 杨斌； 何剑萍； 森维； 戴永年； 刘大春；

【Author】 XU Bao-qiang~(1,2,3) YANG Bin~(1,2) HE Jian-ping~4 SENG Wei~(1,2,3) DAI Yong-nian~(1,2,3) LIU Da-chun~(1,2,3) (1.National Engineering Laboratory for Vacuum Metallurgy,Kunming 650093,PR.China;2.Key Laboratory of Vacuum Metallurgy for Nonferrous Metal of Yunnan Province,Kunming 650093,PR.China;3.Faculty of materials and metallurgy engineering,Kunming University of Science and Technology,Kunming,650093,PR.China;4.YunNan XinLi Nonferrous Metal Limited Company,Kunming 650093,PR.China)

【机构】 真空冶金国家工程实验室； 云南省有色金属真空冶金重点实验室； 昆明理工大学材料与冶金工程学院； 云南新立有色金属有限公司；

【摘要】 本文对不同体系压力下二氧化钛碳热还原进行了热力学计算,表明低于常压体系时二氧化钛易被碳还原生成TiC。体系压力下降有利于还原反应向气体增大的方向进行,当体系压力为10Pa时,大于1600K条件下还原将能得到金属钛。在此基础上,采用X射线衍射以及自制的电阻测试设备考察了二氧化钛的碳热还原过程。结果表明当压力为10Pa,还原温度高于1673K条件下,还原产物主要为TiC、TiO以及Ti₂O₃,并没有金属钛生成。而且,随着还原温度的提高,TiO₂应经历TiO₂→Ti₃O₅→Ti₂O₃→TiO（TiC）的还原过程。TiO和TiC的对应特征衍射峰均存在微量偏移,预示着TiC与TiO可能已形成了连续固溶体。还原产物的电阻率明显小于原料的电阻率,低温还原产物具有更好的导电性。更多还原

【Abstract】 The thermodynamic calculation for carbothermic-reduction of titanium dioxide at different system pressure was carried out,the results indicated that TiO₂ is reduced by carbon will be easy to produce TiC at the system pressure lower than normal pressure.Low system pressure will conduce reactions to move towards direction increasing gas and Ti will be produced at the temperature higher than 1600K when Psys=10Pa.On the basis of above calculation,carbothermic-reduction process of titanium dioxide was investigated by X-ray diffraction and self-made electric resistance determination device.The results indicated there were TiC、TiO and Ti₂O₃ in reduction slag,but no any metal Ti was produced without regardless of molar ratio of TiO₂ and C at the reduction temperature higher than 1673K and Psys≈10Pa.Carbothermic-reduction process of titanium dioxide should pass the way of TiO₂→Ti₃O₅→Ti₂O₃→TiO（TiC） with reduction temperature rising.Both diffraction peaks of TiO and those of TiC have somewhat offset maybe implies to have formed continuous solid solution of TiO-TiC.Electric resistivities of reduction slags are remarkably less than that of raw material and the reduction slag produced at lower reduction temperature have better electrical conductivity.更多还原