1. Research Center of Mining Technology, National Research, and Innovation Agency of Indonesia, South Lampung, Lampung, Indonesia
2. Department of Chemical Engineering, Norwegian University of Science and Technology, Trondheim, Norway
3. Audit Board Department, National Research and Innovation Agency of Indonesia, Central Jakarta, Jakarta, Indonesia
4. Metallurgical and Material Engineering Department, Faculty of Industrial Technology and Systems Engineering, Institut Teknologi Sepuluh Nopember, Surabaya, Indonesia