An Efficient Extraction and Selective of Alumina from Lapindo MudDidi Dwi Anggoro, Michael David, Shafira Kayla Alrasyid, Cahya Kamilla Chaerunnisa and Desita RachmawantiE3S Web Conf., 503 (2024) 06004DOI: https://doi.org/10.1051/e3sconf/202450306004