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Waste biomass may contain artificial compounds added during the intermediate treatment process of biomass, as well as natural inorganic matter and compounds discharged by human activity. Carbonized biomass produced for the purpose of fuel utilization for example, may affect self-heating characteristics depending on the compound added. In this study, in order to evaluate the effect on self-heating characteristics by iron compounds produced by carbonization, poly ferric sulfate was selected as a compound to be added, and elemental speciation of iron compounds and thermal behavior by oxidation reaction of carbonized biomass were analyzed. As a result, it was found that carbonized biomass containing poly ferric sulfate may have decreased self-heating characteristics by retaining under air atmosphere for several days. From elemental speciation analysis of iron compounds, it was confirmed that hydrates of FeSO4 exists in carbonized biomass immediately after production and become Fe(OH)SO4 after oxidation reaction. As a result of analysis of thermal behavior of carbonized biomass, it was found that heating value due to oxidation reaction tended to increase according to the amount of poly ferric sulfate. When the amount of poly ferric sulfate is large, it could greatly affect heating value of the whole of carbonized biomass.

Elemental Speciation Analysis of Iron Compounds in Carbonized Biomass and Its Thermal Behavior by Oxidation Reaction