1. National Engineering Research Center for Environment-friendly Metallurgy in Producing Premium Non-ferrous Metals, GRINM Group Corporation Limited, Beijing, People’s Republic of China
2. GRINM Resources and Environment Tech. Co., Ltd., Beijing, People’s Republic of China
3. General Research Institute for Nonferrous Metals, Beijing, People’s Republic of China
4. GRIMAT Engineering Institute Co., Ltd., Beijing, People’s Republic of China