Iron Recovery from Residue of Lateritic Nickel Leaching Industry Nur V. Permatasari, Hadiyanto, Budi Warsito, Adji Kawigraha and Nur Ikhwani E3S Web Conf., 317 (2021) 04033 Published online: 05 November 2021 DOI: 10.1051/e3sconf/202131704033