Research Status and Development of Deoxidation Process of Titanium Waste
JIAO Lina1,3, LIU Xiaomei1, XIONG Fuhao1, CHEN Guangyao1, DOU Zhihe2, LU Xionggang1,4, LI Chonghe1,4
1 State Key Laboratory of Advanced Special Steel, Shanghai Key Laboratory of Advanced Ferrometallurgy, School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China 2 School of Metallurgy and Materials Engineering, Jiangsu University of Science and Technology, Zhangjiagang 215600, China 3 Key Laboratory for Ecological Metallurgy of Multimetallic Mineral, Ministry of Education, Northeastern University, Shenyang 110819, China 4 Shanghai Special Casting Engineering Technology Research Center, Shanghai 201605, China
Abstract: Titanium alloy is widely used in aerospace, chemical, marine engineering and other fields due to their excellent performance. The amount of the low-purity, multi-component waste titanium materials were increased with the wide application of the titanium alloy products. However, the oxygen could easily dissolve into the titanium alloy, and it increases the difficulty for titanium scrap recycling. Thus, it’s important to reduce and recover metal titanium scrap. Titanium and titanium alloy have high affinity with oxygen, which resulted that a lot of waste titanium alloy would generate during the alloy processing. However, the excess oxygen concentration would reduce the ductility and fatigue resistance of the titanium alloys. So, reducing the oxygen content is the primary task for recycling the titanium waste. Recently, the most widely deoxidation methods for the titanium alloy were molten salt electrochemical deoxidation process, hydrogenation-dehydrogenation (HDH), titanium and titanium alloy smelting deoxidation process (adding deoxidizer and slag), respectively. During the electrochemical deoxidation process of molten salt, the titanium solid oxides are considered as the cathode for the OS method and the FFC method, which achieve the good deoxidation effect in the laboratory, and it provides a new research direction for the direct preparation of titanium metal from titanium dioxide. However, the slow diffusion rate of oxygen in the solid electrode was the main problem for the industrialization. The SOM method is environmentally friendly and solves the problems of low current efficiency of FFC and difficulty in controlling side reactions, and the stability of the oxygen permeable membrane has hindered the progress of its industrialization. The USTB process can reduce the cost of titanium to the cost of aluminum, but the large-scale anode processing and unstable cathode deposition during electrolysis are the main problems to be solved in the industrialization. The HDH method for the deoxidation of waste titanium alloy is the hot spot in recent years. There are still problems in the dehydrogenation process for removing the hydrogen concentration, and the high oxygen content in the titanium product was still the problem. The metal thermal reduction combined with titanium alloy smelting process is an effective way to recover waste titanium and reduce oxygen content. The study of suitable deoxidizer and deoxidizing slag is the key to realize the recovery of waste titanium. This paper reviews the principle and research status of titanium waste recycling and deoxidation process, including OS method, FFC method, SOM method and HDH method. The research progress of deoxidation of waste titanium material by metal thermal reduction method combined with smelting process is introduced, including the selection of slag and deoxidizer, and the research on smelting deoxidation process is prospected.
作者简介: 焦丽娜,2008年3月毕业于东北大学,获得工学硕士学位。2008年4月起工作于江苏科技大学,现为上海大学材料科学与工程学院博士研究生,在李重河教授的指导下进行研究。目前主要研究领域为钛及钛合金材料。 李重河,上海大学材料科学与工程学院教授、博士研究生导师,上海特种铸造工程技术研究中心主任。1984年7月本科毕业于中国人民解放军国防科技大学,1995年5月在中国科学院上海冶金研究所冶金物理化学专业取得博士学位,1995—2000年工作于中国科学院上海冶金研究所,期间获得国务院特殊津贴。2000—2004为新加坡Institute of High Performance Computing of Singapore高级研究工程师、访问教授,2004年6月工作于上海大学,获八五“八六三”课题工作奖、上海市科技进步一等奖,先后主持八六三计划、自然科学基金和上海市科委等省部级研究项目30多项,发表科技论文200余篇,其中100多篇被SCI收录。
引用本文:
焦丽娜, 刘晓梅, 熊富豪, 陈光耀, 豆志河, 鲁雄刚, 李重河. 钛废料脱氧工艺研究现状及进展[J]. 材料导报, 2020, 34(13): 13036-13043.
JIAO Lina, LIU Xiaomei, XIONG Fuhao, CHEN Guangyao, DOU Zhihe, LU Xionggang, LI Chonghe. Research Status and Development of Deoxidation Process of Titanium Waste. Materials Reports, 2020, 34(13): 13036-13043.
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2020, Vol. 34 
