Examinando por Materia "Mineralogy"

Mostrando 1 - 3 de 3
  • No hay miniatura disponible
    Ítem
    Cratón Amazónico como posible origen de la ocurrencia aurífera tipo placer en el Oriente Colombiano
    (Universidad EAFIT, 2022) Restrepo Rios, Nicolás; Gómez Gutiérrez, Diego Felipe
    Through a complete work of collecting mineralogical, geochemical, geochronological data from previous studies, together with the compilation of geological interpretations made in Proterozoic rocks in southeastern Colombia, a preliminary evaluation is made about the possibility that these rock units may host gold mineral depositsthat have been hosted during the early stages of formation of these bodies, to identify possible primary sources that are contributing secondary gold manifestations in placers on the riverbanks.
  • No hay miniatura disponible
    Ítem
    Multifactorial optimization of the decolorisation parameters of wastewaters resulting from dyeing flowers.
    (IWA PUBLISHING, 2009-01-01) Gil Pavas, Edison; Angel Gomez-Garcia, Miguel; Gil Pavas, Edison; Angel Gomez-Garcia, Miguel; Universidad EAFIT. Departamento de Ingeniería de Procesos; Procesos Ambientales (GIPAB)
    This work deals with the treatment of the wastewaters resulting from the process of dyeing flowers. In some local cases for growing flowers near to Medellin (Colombia), wastewater color was found to be one of the main problems in meeting local effluent standards. Wastewaters were treated by photodegradation process (which includes photocatalysis) to achieve the degradation of dyes mixture and organic matter in the wastewater. A multifactorial experimental design was proposed, including as experimental factors the following variables: pH, and the concentration of both catalyst (TiO(2)) and hydrogen peroxide (H(2)O(2)). According to the obtained results, at the optimized variables values, it is possible to reach a 99% reduction of dyes, a 76.9% of mineralization (TOC) and a final biodegradability of 0.834. Kinetic analysis allows proposing a pseudo first order reaction for the reduction, the mineralization, and the biodegradation processes.
  • Miniatura
    Ítem
    Pore Structure Characteristics and Gas Storage Potential of the Cretaceous La Luna Formation, Middle Magdalena Valley Basin, Colombia
    (Universidad EAFIT, 2020-06-19) Casadiego-Quintero, Efraín; Rios-Reyes, Carlos Alberto; Fundación Universitaria Agraria de Colombia; Universidad Industrial de Santander
    The rocks of interest in the present study (mudstones) show inherently a heterogeneous pore-size distribution in the matrix. They can present organic and inorganic pores and the transport mechanism through pores is different, and, therefore, it is necessary to describe their organic and inorganic porosity. This work uses different microscopy techniques to characterize mudstones from the Galembo Member of the Cretaceous La Luna Formation, Middle Magdalena Valley Basin, Colombia. These rocks present several pore types, including interparticle pores due to flocculation of clay minerals, organoporosity due to burial and thermal maturity, intraparticle pores from organisms, intraparticle pores within mineral grains, and microchannels and microfractures. The existence of interconnected pores in such complex fracture-pore system provides effective pathways for primary gas migration and it also provides a storage space for the residual hydrocarbon in mudstones, which is important for the primary migration and storage in gas reservoir rocks. The pore connectivity is high and increases towards the top of the sedimentary sequence.