PERANGIN-ANGIN, H. P. . COAL ION EXCHANGE TO REDUCE NA LEVELS BY UTILIZING ACID MINE WATER: PERTUKARAN ION BATUBARA UNTUK MENGURANGI KADAR NA DENGAN MEMANFAATKAN AIR ASAM TAMBANG. INTAN Jurnal Penelitian Tambang, [S. l.], v. 2, n. 1, p. 42–47, 2022. DOI: 10.56139/intan.v2i1.20. Disponível em: https://jurnal-intan.ac.id/index.php/intan/article/view/20. Acesso em: 22 jul. 2026.