Hydrothermal conversion Bimodal distribution 1 Biochemical process 1 Biomass 1 Crystalline structure 1 Energy 1 Fly ash 1 Gasification 1 Higher temperatures 1 Hydrochloric acid 1 Industrial applications 1 Industrial research 1 Modeling 1 Particle size analysis 1 Peak intensity 1 Physicochemical properties 1 Pretreatment temperature 1 Pyrolysis 1 Raw fly ashes 1 Reaction temperature 1 Research gaps 1 Silicate minerals 1 Size uniformity 1 Sodium 1 Sodium hydroxide solutions 1 Synthesis (chemical) 1 Synthesis temperatures 1 Thermo chemical process 1 Thermochemical Conversion 1 Torrefaction 1