TY - JOUR
T1 - Chlorination-volatilization behavior of titanium metal scraps during recycling using reaction-mediating molten salt
AU - Taninouchi, Yu Ki
AU - Hamanaka, Yuki
AU - Okabe, Toru H.
N1 - Funding Information:
The authors are grateful to Professors Tetsuya Uda and Naoyuki Hatada of Kyoto University, and Dr. Katsuhiro Nose and Dr. Jungshin Kang of The University of Tokyo for their valuable comments. The authors are also grateful to Messrs. Susumu Kosemura, Masanori Yamaguchi, Yuichi Ono, and Yosuke Inoue of Toho Titanium Co., Ltd. for their valuable suggestions and for providing useful information. This work was mainly supported by the Japan Society for the Promotion of Science (JSPS) through a Grant-in-Aid for Young Scientists (B) (KAKENHI Grant no. 25820375). Parts of this work were also supported by the Japan Society for the Promotion of Science (JSPS) through a Funding Program for Next Generation World-Leading Researchers (NEXT Program, Project no. GR019), and a Grant-in-Aid for Scientific Research (S) (KAKENHI Grant no. 26220910).
Publisher Copyright:
©2016 The Mining and Materials Processing Institute of Japan.
PY - 2016
Y1 - 2016
N2 - In order to develop an efficient and environmentally friendly process for recycling both titanium scrap and FeClx (x= 2, 3) waste, the chlorination-volatilization of titanium metal scraps utilizing a MgCl2-SmCl3 reaction-mediating molten salt was examined. After the thermodynamic analyses on the chlorination behavior of representative elements such as the alloying elements and oxygen, fundamental experiments were carried out at 1100 K by reacting off-grade Ti sponge, Ti-6Al-4V alloy rod, and Ti rod with MgCl2-SmCl3 molten salt. The results indicated that TiCl4 could be effectively produced and volatilized from off-grade sponge and Ti-6Al-4V alloy. It was also confirmed that Fe and Ni in the Ti scrap remain in the molten salt as metal, whereas the Al and V in Ti alloy are chlorinated by SmCl3 and their chlorides volatilized. Oxygen introduced into the reaction system was found to form TiOCl in the molten salt, and therefore does not consume the SmCl3 mediator in the molten salt. These Findings confirm that chlorination using a reaction-mediating molten salt is an effective means of recycling both titanium scrap and FeClx waste.
AB - In order to develop an efficient and environmentally friendly process for recycling both titanium scrap and FeClx (x= 2, 3) waste, the chlorination-volatilization of titanium metal scraps utilizing a MgCl2-SmCl3 reaction-mediating molten salt was examined. After the thermodynamic analyses on the chlorination behavior of representative elements such as the alloying elements and oxygen, fundamental experiments were carried out at 1100 K by reacting off-grade Ti sponge, Ti-6Al-4V alloy rod, and Ti rod with MgCl2-SmCl3 molten salt. The results indicated that TiCl4 could be effectively produced and volatilized from off-grade sponge and Ti-6Al-4V alloy. It was also confirmed that Fe and Ni in the Ti scrap remain in the molten salt as metal, whereas the Al and V in Ti alloy are chlorinated by SmCl3 and their chlorides volatilized. Oxygen introduced into the reaction system was found to form TiOCl in the molten salt, and therefore does not consume the SmCl3 mediator in the molten salt. These Findings confirm that chlorination using a reaction-mediating molten salt is an effective means of recycling both titanium scrap and FeClx waste.
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U2 - 10.2320/matertrans.M-M2016818
DO - 10.2320/matertrans.M-M2016818
M3 - Article
AN - SCOPUS:84979561865
SN - 0916-1821
VL - 57
SP - 1309
EP - 1318
JO - Materials Transactions
JF - Materials Transactions
IS - 8
ER -