钛废料脱氧工艺研究现状及进展

doi:10.11896/cldb.19050140

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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.

Key words： titanium scrap OS method FFC method SOM method deoxidation smelting process

Published: 24 June 2020

CLC number:

TF84

Fund:Key Laboratory for Ecological Metallurgy of Mulitimetallic Mineral (Ministry of Education) Open Subject, National Natural Science Foundation of China (U1760109)

About author:: Lina Jiaoreceived her M.S. degree in nonferrous me-tallurgy from Northeastern University in 2008. She worked at Jiangsu University of Science and Technology in April 2008. She is currently pursuing her Ph.D. at the School of Materials Science and Engineering, Shanghai University under the supervision of Prof. Chonghe Li. Her research has focused on titanium and titanium alloy materials.
Chonghe Lireceived his Ph.D. of physical chemistry of materials, Master of material sciences and technology, Research Professor and Senior Research Engineer of physical chemistry of materials. Over 20 years wor-king experience in computational material science, materials design, correlation/data-mining of materials research, alloying physical chemistry, hydrogen-storage alloy and Ni-MH battery, fuel cell, computerized chemistry, published over 60 scientific papers. He has presided over more than 30 provincial and ministerial research projects such as 863, Natural Science Foundation and Shanghai Science and Technology Commission, and published scientific papers 200. The remaining articles, more than 100 of which were included in the SCI.

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	JIAO Lina
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Cite this article:

JIAO Lina,LIU Xiaomei,XIONG Fuhao, et al. Research Status and Development of Deoxidation Process of Titanium Waste[J]. Materials Reports, 2020, 34(13): 13036-13043.

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http://www.mater-rep.com/EN/10.11896/cldb.19050140 OR http://www.mater-rep.com/EN/Y2020/V34/I13/13036

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