Selective reduction for nickel laterite using sodium sulfate and palm kernel shell charcoal followed by magnetic separationHafid Zul Hakim, Edy Sanwani, Yuliana Sari, Fajar Nurjaman, Fika Rofiek Mufakhir, Aqwammul Fauzan, Yudha Gusti Wibowo, Alio Jasipto, Jarwinda and JuniwatiE3S Web Conf., 693 (2026) 03004DOI: https://doi.org/10.1051/e3sconf/202669303004