基于MgCl_(2)-HoCl_(3)熔盐镁直接脱除钛废料中固溶氧研究  

Direct Removal of Solid-Soluted Oxygen from Titanium by Magnesium in MgCl_(2)-HoCl_(3)Flux

作　　者：朱立国 孔令鑫 徐俊杰 徐宝强[1,2] 游彦军 李一夫 杨斌 Zhu Liguo;Kong Lingxin;Xu Junjie;Xu Baoqiang;You Yanjun;Li Yifu;Yang Bin(National Engineering Laboratory for Vacuum Metallurgy,Kunming University of Science and Technolo-gy,Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Key Laboratory of Vacuum Metallurgy for Non-ferrous Metal of Yunnan Province,Kunming 650093,China;State Key Laboratory of Nonferrous Metal Resources Clean Utilization in Yunnan Province,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,昆明理工大学冶金与能源工程学院,云南省有色金属真空冶金重点实验室,云南昆明650093 [2]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：《中国稀土学报》2022年第1期135-143,I0005,共10页Journal of the Chinese Society of Rare Earths

基　　金：国家自然科学基金项目(21968013);2017年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(110014078334)资助。

摘　　要：针对现有钛脱氧方法存在成本高、效率低、金属/熔盐分离困难等问题,本研究提出了一种在MgCl_(2)-HoCl_(3)熔盐中,采用Mg作脱氧剂直接脱除钛中固溶氧的新方法。在1273 K下开展了热力学计算和实验研究,结果表明:在MgCl_(2)-HoCl_(3)熔盐中,借助HoOCl(O(inβ-Ti)+Mg(l)+HoCl_(3)(l)=MgCl_(2)(l)+HoOCl(s))的生成,有效降低了脱氧副产物MgO的活度,促进了镁深度脱氧,钛中氧含量可降低至1000×10^(-6)以下(甚至500×10^(-6)以下)。随着熔盐中HoCl_(3)活度的增加,钛中的氧含量降低,当HoCl_(3)的活度为1.0时,氧含量可降至80×10_(-6)左右。基于以上研究结果,本研究提出了一种新的脱氧工艺,该工艺具备成本低、效率高、金属/熔盐分离简单等优势,有望在未来实现工业化应用。The existing deoxidation method has disadvantages,such as high cost,low efficiency,and difficulty in separation of molten salt from metal etc.This study proposes a new method to directly remove solid dissolved oxygen in titanium by using Mg as a deoxidizer in MgCl_(2)-HoCl_(3)molten salt.The thermodynamic calculation and experiments were conducted at 1273 K.The results indicate that the formation of HoOCl O(inβ-Ti)+Mg(l)+HoCl_(3)(l)=MgCl_(2)(l)+HoOCl(s)effectively reduces the activity of MgO and promotes the deep deoxidation of magnesium in MgCl_(2)-HoCl_(3)molten salt.The oxygen content in titanium can be reduced to below 1000×10^(-6)(or even below 500×10^(-6)).In addition,the oxygen content in titanium decreases with the increase of the activity of HoCl_(3)in molten salt.When the activity of HoCl_(3)is 1.0,the oxygen content can be reduced to approximately 80×10^(-6).Based on the above results,this study proposes a new deoxidation process with the advantages of low cost,high efficiency,and simplicity in separation of molten salt from metal,which has a potential to be used in industry in the future.

关 键 词：钛 固溶氧 直接脱氧 MgCl_(2)-HoCl_(3)熔盐 

分 类 号：TF823[冶金工程—有色金属冶金]