Examinando por Autor "Piñeres, Jorge"

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  • Miniatura
    PublicaciónAcceso abierto
    Effect of air velocity, pH and frother concentration on vitrinite recovery using column flotation.
    (2014-04-10) Piñeres, Jorge; Barraza Burgos, Juan Manuel; Blandón, Astrid
    Coal macerals can be separated using flotation process by taking advantage of differences in their surface properties. In this work, the effect of pH, air velocity (Jg) and frother concentration (FC) on the vitrinite separation of two coal samples from Colombia, Cerrejón and Jagua was studied. The experimental runs were carried out by flotation column at pH ranging from 4 to 10, FC from 2 to 6 ml of frother/kg of coal and Jg from 0.7 to 2.1 cm/s Jg. Results showed that both coals exhibited vitrinite recoveries above 60% at pH 5, Jg 1 cm/s and FC of 3 ml/kg of coal. For Cerrejón coal, the highest vitrinite recovery (63.55%) was obtained at pH 7, Jg 0.7 cm/s and FC of 4 ml de frother/kg of coal, whereas for Jagua coal, the highest vitrinite recovery (69.80%) was obtained at pH 4, Jg 1.4 cm/s, and 4 ml of frother/kg of coal respectively. It was also noted that both coals exhibited the highest value of vitrinite recovery at acid conditions compared with those obtained using basic conditions. Los macerales del carbón se pueden separar usando procesos de flotación aprovechando las diferencias de suspropiedades superficiales. En este trabajo, se estudió el efecto del pH, la velocidad del aire (Jg) y la concentraciónde espumante (FC) sobre la separación de vitrinita de dos minas de carbones del Cerrejón y Jagua (Colombia). Las corridas experimentales se realizaron en una columna de flotación usando pH en el rango de 4 a 10; FC en el rango2 a 6 ml de espumante/kg de carbón y Jg en el rango de 0.7 a 2.1 cm/s. Los resultados mostraron que ambos carbonespresentaron recuperación de vitrinita superiores al 60% a pH 5, Jg 1 cm/s y FC 3 ml/kg de carbón. Para el carbónCerrejón, la mayor recuperación de vitrinita (63.55%) se obtuvo a pH 7, Jg 0.7 cm/s and 4 ml de espumante/kg decarbón, mientras que para el carbón Jagua, la mayor recuperación de vitrinita (69.80%) se obtuvo a pH 4, Jg 1.4cm/s and 4 ml de espumante/kg de carbón respectivamente. Se observó también que ambos carbones presentaronlos más altos valores de recuperación del grupo vitrinita a condiciones acidas en comparación con las obtenidas acondiciones básicas.
  • Miniatura
    PublicaciónAcceso abierto
    Evaluation of the flotation of a refuse tailing fine coal slurry using release analysis.
    (Universidad del Valle, 2018-01-30) Piñeres, Jorge; Barraza Burgos, Juan Manuel; García, Edward; Sandoval, Sebastián
    (Eng) Performance of flotation when processing a refuse tailing fine coal slurry from a Colombian coal cleaning plant was studied using release analysis to evaluate the potential cleaning in terms of both, low ash and high recovery. Results from release analysis showed, that this was a good estimate for obtaining ideal flotation data, as well as exploring the feasibility of cleaning this material. The results showed that the best combination of collector–frother was diesel oil-MIBC, producing re - coveries on the order of 65%, with cumulative ash value less than 10%. It was also tend that the type of frother significantly affected the behavior of a refuse tailing fine coal slurry in a mechanical flotation cell.