Abstract

VASQUEZ OSORIO, Mayerlis; COLPAS CASTILLO, Fredy  and  TARON DUNOYER, Arnulfo. Influence of particle size in the extraction of bituminous carbon humic acids. rev.udcaactual.divulg.cient. [online]. 2019, vol.22, n.1, e1209.  Epub May 16, 2019. ISSN 0123-4226.  https://doi.org/10.31910/rudca.v22.n1.2019.1209.

Humic substances are a group of macromolecules from biodegradable organic matter. These substances can be obtained from high-rank coals and are important in the removal of contaminants in aqueous solutions. In this study, the influence of particle size on the extraction of humic acids from samples of bituminous coal is evaluated. Oxidation in aqueous solution of the samples with hydrogen peroxide was carried out at concentrations of 50, 40 and 30% respectively, extraction times of 3 and 6 hours and particle size at 60 and 120 mesh number. The carbon samples were characterized by infrared spectrometry (FTIR). A close analysis was performed to determine % moisture, % volatile matter (% MV), % ash, % fixed carbon (% CF) and % CF/MV ratio. Thermogravimetric analysis (TGA) was performed on TGA Q-500 thermography equipment. The highest percentage of extraction (76.8 ± 3.50) was obtained at a concentration of 50% of oxidizing agent, extraction time of 6 hours and particle size to mesh No 120. The extraction time influences the amount of humic acid that can be extracted, a concentration of 40% of oxidizing agent, no statistically significant differences were found (P> 0.05) for times of 3h (32.8±1.0, 120 mesh) and (30.6±2.4, 60 mesh). The carbonaceous material used in this research may be a potential candidate for obtaining useful humic acids in the agricultural industry.

Keywords : agricultural fertilizers; carbonaceous matter; humic substances; oxidation.

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