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Revista Tecnica de la Facultad de Ingenieria Universidad del Zulia(2)
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scopus(4)
Effect of coal weathering on some geochemical parameters
ArticleAbstract: The effect of coal weathering on some geochemical parameters was studied. Seven pairs of fresh and aPalabras claves:Bitumen, Coal, floatability, geochemistry, humic substances, VENEZUELA, WeatheringAutores:Escobar M., Manuel MartínezFuentes:scopusEffect of temperature, oxidation time and substrate: Oxidant agent ratio in the yield and composition of humic acids derived from coal, monitored by <sup>1</sup>H NMR and FT-ir
ArticleAbstract: The yield and composition of coal-derived humic acids (AH) was studied, obtained by oxidation of a VPalabras claves:Coal, FT-ir, Humic acids, NMR, OXIDATION, WeatheringAutores:Contreras E., Leal E., Manuel MartínezFuentes:scopusOxidation of natural graphite in the laboratory and comparison with the synthetic graphite oxide, by means of thermal and spectroscopic techniques
ArticleAbstract: With the aim of establishing the probable natural formation of graphite oxide (GO) during the weathePalabras claves:Cristalinity, graphite, Graphite oxide, VENEZUELA, WeatheringAutores:Barrios C., Escobar M., Manuel Martínez, Marrero S., Meléndez W., Pisapia D., Reátegui K.Fuentes:scopusThe effects of sulfur on the weathering extent of carbon. A companson of two mines in Hato de la Virgin, State of Tachira, Venezuela
ArticleAbstract: Ten bituminous coal samples, showing several weathering levels, were collected at different depths iPalabras claves:Coal, geochemistry, OXIDATION, Sulfur, VENEZUELA, WeatheringAutores:Escobar M., Esteves I.H., Galarraga F., González R., Manuel MartínezFuentes:scopus