Ekstraksi Silika Limbah Abu Layang Batubara Sebagai Bahan Baku Pembuatan Fill…

The problems were facing by PT. IKPP Perawang are high coal fly ash and paper bulk (volume/weight) of print paper. The content of silica on the coal fly ash (CFA) used as raw material to prepare paper filler. Silica from this CFA was optimized by various concentration of sodium hidroxide (1, 2, 3, 4 & 5N), reaction time (1,2, 3 & 4 h), mass ratio of fly ash to NaOH (1 :3, 1:4, 1:5, 1:6) and sti…