Humic acid is an organic substance that is produced by a series of decomposition and transformation processes of the remains of dead animals and plants. The oxidative polymerization of polyphenols in soils is regarded as one of the main processes in the formation of humic substances.
There have been many studies to find industrial applications of humification processes. However, there are few reports on the properties of humic acids in their use as binders for coal briquette.
O Chan Sok, a researcher at the Faculty of Metal Engineering, has conducted some experiments to improve the thermal stability and aromatization of humic acid in oxidized lignite with low humic acid content, and determined the optimum conditions.
He set ferric oxide content, caustic soda content, heating temperature and heating time as experimental parameters, and varied them at three levels, respectively. The optimum conditions are as follows. The ferric oxide and caustic soda oxide were 5% and 8% of the humic acid feed, respectively, and the reaction temperature and the reaction time were 80℃ and 60min, respectively.
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