For two days from March 28 to March 29, 2025, the 18th Workshop on Reactive Metal Processing (RMW18) was held at the Massachusetts Institute of Technology (MIT). This annual workshop is an international industry-academia collaborative workshop on materials processing, jointly organized by Prof. Toru H. Okabe and Prof. Shunsuke Yagi of the Institute of Industrial Science (IIS), the University of Tokyo, as well as Prof. Donald R. Sadoway and Prof. Antoine Allanore of MIT. The workshop is a leading international workshop in the field of reactive metal processing with approximately 70 participants from many countries, such as the USA, Canada, Norway, and Japan. The two-day workshop included presentations on rare metals production/recycle processing, as well as advanced battery materials, which are essential for a sustainable society. The participants had active and fruitful discussions. Furthermore, the workshop was conducted in cooperation with the students and staff of both MIT and the University of Tokyo, which contributed to the development of closer relations among them.