The present invention provides methods of utilizing biomass materials, in which biomass materials are mixed directly with the reactants and the biomass materials while in combustion can directly heat up the reactants to the temperature required for the chemical reaction to take place. Such chemical reaction takes advantage of the heat energy, carbon element and/or silicon element that are inherently contained within biomass materials. For instance, biomass materials produce powdery or lumpy alkali metal silicates when chemically reacting with alkali metal compounds, synthesize black powder when reacting with nitrates, redox sulfates and decompose carbonates, etc. The present invention is characterized with high heat utilization, no need for external heat source, low power consumption, greatly reduced equipment costs, and the significantly simplified process.