Reduction of natrojarosite and laterite nickel ore leaching residue composite using palm kernel shell reducing agents at temperatures of 1300-1450℃Afif Nur Iksan, Zulfiadi Zulhan, Achmad Haerul Yusro and Taufiq HidayatE3S Web Conf., 543 (2024) 02016DOI: https://doi.org/10.1051/e3sconf/202454302016