| Abstract:In this paper, the properties of calcium silicate generated from fly ash and its effect on the paper property when it was used as paper filler were investigated. The results were compared with those from PCC- filled sheets under the same conditions. Scanning electronic microscopic observation revealed that the particles of CaSiO3 generated from fly ash had a honeycomb pattern, which was responsible for their highly porous surface structure and high specific surface area. The average diameter of the particles was 10.63 μm, the oil-absorbed value was 2.178 g/g, the sediment volume was 4.0 mL/(10 g·24 h), and the brightness was 90.5%, which proved to be suitable for use as paper filler. The results showed that with the increasing content of the CaSiO3, the paper had higher opacity and higher brightness, but lower tensile strength, tearing strength almost unchanged when CaSiO3 content was no more than 30%. When the dosages of fillers were 30%, compared with the papers loaded with PCC, the brightness and tensile of the paper loaded with CaSiO3 were almost the same, while the opacity was 5.1% lower and tearing index was 1.3 mN·m2/g higher. SEM photo of the paper loaded with CaSiO3 showed the fibers were well intertwined with CaSiO3. |
