SIAHAAN, S. D. Y.; WAHYUSI, K. N. .; KURNIATI, E.; NURCHOLIS, F. . Optimization of Potassium Silicate Fertilizer Production from Fly Ash: Effect of KOH Concentration and Extraction Time. CHEMICA: Jurnal Teknik Kimia, [S. l.], v. 12, n. 1, p. 18–24, 2025. DOI: 10.26555/chemica.v12i1.337. Disponível em: https://journal3.uad.ac.id/index.php/chemica/article/view/337. Acesso em: 5 may. 2025.