Siahaan SDY, Wahyusi KN, Kurniati E, Nurcholis F. Optimization of Potassium Silicate Fertilizer Production from Fly Ash: Effect of KOH Concentration and Extraction Time. CJTK [Internet]. 2025Apr.21 [cited 2025May5];12(1):18-24. Available from: https://journal3.uad.ac.id/index.php/chemica/article/view/337