An Efficient Extraction and Selective of Alumina from Lapindo Mud Didi Dwi Anggoro, Michael David, Shafira Kayla Alrasyid, Cahya Kamilla Chaerunnisa and Desita Rachmawanti E3S Web Conf., 503 (2024) 06004 Published online: 20 March 2024 DOI: 10.1051/e3sconf/202450306004