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.
All Science Journal Classification (ASJC) codes
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering