THE TREATMENT PROCESS OF BIOMASS ASH TO UTILIZED IN CRYSTAL GLASS MATERIAL

This work aimed to synthesize the crystals of glass by using biomass ash as its silica source. Firstly, biomass ash was synthesized by different extraction methods with thermal treatment compared with chemical treatment to remove inorganic impurities, followed by heating at various temperatures. Secondly, silica, which was heated at the first step, was used as the raw material for crystal glass. The crystal glass was prepared by conventional melting at 1400°C. The chemical composition, phase formation, and microstructure of biomass ash were investigated and reported. Moreover, the physical properties and microhardness value of glass preparation were discussed. The highest SiO2 content of 97.50 was obtained with the chemical treatment by HCl 3M before heating at 1100°C. The XRD pattern of the as-received material showed the presence of amorphous-phase silica. The cristobalite phase was achieved when the biomass ash was heated at 900°C and slightly increased with increasing thermal temperature. Similar results were obtained from samples that were synthesized by chemical extraction followed by a heating process with cristobalite as the main phase. The optimum conditions that showed the highest microhardness value were achieved with the sample of pretreat with HCl 3M and then heated biomass ash at 1100°C.