基于MgCl_(2)-LaCl_(3)熔盐中Mg作脱氧剂的钛脱氧方法  

Deoxidation of Titanium Using Mg as Deoxidant in MgCl_(2)-LaCl_(3)Flux

作　　者：庞俭 孔令鑫[1,2,3,4] 徐俊杰 游彦军[1,2,3] 徐宝强 杨斌[1,2,3,4] PANG Jian;KONG Lingxin;XU Junjie;YOU Yanjun;XU Baoqiang;YANG Bin(National Engineering Laboratory for Vacuum Metallurgy,Kunming University of Science and Technology,Kunming 650093,China;Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;Yunnan Key Laboratory of Non-ferrous Metal Vacuum Metallurgy,Kunming 650093,China;State Key Laboratory of Clean Utilization in Complex Non-ferrous Metal Resources,Kunming 650093,China)

机构地区：[1]昆明理工大学真空冶金国家工程实验室,云南昆明650093 [2]昆明理工大学冶金与能源工程学院,云南昆明650093 [3]云南省有色金属真空冶金重点实验室,云南昆明650093 [4]复杂有色金属资源清洁利用国家重点实验室,云南昆明650093

出　　处：《昆明理工大学学报（自然科学版）》2021年第2期13-20,共8页Journal of Kunming University of Science and Technology(Natural Science)

基　　金：国家自然科学基金项目(21968013);孔令鑫高层次人才平台建设项目(KKKP201752023);杨斌科技领军人才培养经费项目(110014078334)。

摘　　要：针对现有钛废料脱氧方法存在效率低、金属/熔盐分离困难等问题,提出了一种在MgCl_(2)-LaCl_(3)熔盐中,采用Mg作脱氧剂脱除钛废料中固溶氧的新方法.通过热力学计算和实验结果分析,证实了LaOCl的生成(O(inβ-Ti)+Mg(l)+LaCl_(3)(l)=MgCl_(2)(l)+LaOCl(s))有效降地低了MgO的活度,促进了镁深度脱氧,Ti中氧含量可降低至1×10^(-3)以下(甚至5×10^(-4)以下).随着熔盐中LaCl_(3)的活度逐渐增大,钛中氧含量逐渐降低,当LaCl_(3)的活度为0.9时,氧含量可降至2.8×10^(-4)左右.上述结果表明:在MgCl_(2)-LaCl_(3)熔盐中,采用Mg作脱氧剂,可有效地降低钛废料中的固溶氧,且脱氧效果显著.本研究将为钛废料的清洁高效脱氧提供一种新方法,将加快推进钛废料的回收利用.Given the disadvantage of a low efficiency and difficulty in separation of molten salt from metal,a new method is proposed to directly remove dissolved oxygen from titanium(Ti)scrap in MgCl_(2)-LaCl_(3)flux by using Mg as deoxidant.Based on the thermodynamic analysis and experimental results,the generation of LaOCl(O(inβ-Ti)+Mg(l)+LaCl_(3)(l)=MgCl_(2)(l)+LaOCl(s))has been proved to effectively reduce the activity of MgO and promote the deep deoxidation of magnesium,reducing the oxygen content in Ti with below 1×10^(-3)(even below 5×10^(-4)).The oxygen content in Ti gradually decreases with the increase of the activity of LaCl_(3)in flux.When the activity of LaCl_(3)is 0.9,the oxygen content can be reduced to about 2.8×10^(-4).The results show that the dissolved oxygen in the Ti scrap can be effectively reduced using Mg as eoxidant in MgCl_(2)-LaCl_(3)flux,showing remarkable deoxidization effect.A new method for the clean and efficient deoxidation of Ti scrap is provide in this research,accelerating the recycling of Ti scrap.

关 键 词：钛废料 脱氧 稀土金属 MgCl_(2)-LaCl_(3) 回收利用 

分 类 号：TF131[冶金工程—冶金物理化学]