Analysis of Washability of Sabinas Basin Coal: Influence of Ash Content and Fixed Carbon on Calorific Value
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ANALYSIS OF WASHABILITY OF SABINAS BASIN COAL: INFLUENCE OF ASH CONTENT AND FIXED CARBON ON CALORIFIC VALUE. 1
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D. Martínez-Carrillo , E.T. Pecina-Treviño , M.A. Gómez-Borrego , R.H. Estrada-Ruiz . 1 Profesor investigador de la Escuela Superior de Ingeniería - U.A. de C., Blvd. Adolfo López Mateos S/N, Nueva Rosita, Coahuila; México. C.P. 26830. Tel, +52 (861) 614 12 48, E-mail: [email protected]. 2 Profesor investigador del Instituto Nacional del Carbón, Oviedo, España. 3 Profesor investigador del instituto Tecnológico de Saltillo, Saltillo, Coahuila.
Abstract Coal deposits in Mexico were firstly recognized back in 1850, the main coal deposits in Mexico are located north of the Coahuila State. Coal samples from coal mines of Sabinas Basin were collected and analyzed for chemical composition, separation characteristic and calorific value (CV). The analytical data indicate that the coals usually have low or high ash content (Ash), 17 – 50 wt %, depending on the sample source. Comparison of the calorific value with both ahs content and fixed carbon, indicate that these two parameters are directly connected together: the higher the calorific value of coal, the lower the ash content and high fixed carbon content. Rejection of the ash using sink-flotation technique and their ratio whit the calorific value (CV/Ash) was evaluated in this study. Also, the ratio of Calorific value to fixed carbon (FC) was analyzed. Washability analyses for selected coal sample (+1 ½”, -1 ½” + ½”, -½” +¼“, - ¼“ + 1/16”, -1/16” +#100, size group) using heavy organic liquids with a density from 1.3 to 1.6 gr/cm3, were carried out. Calorific value-ash (%)-Fixed Carbon relationship was presented. The results indicate that the ratio CV/Ash vs. specific gravity has an exponential behavior, whereas the value of the ratio CV/FC was found to be 117.3. Keywords: washability, coal, calorific value 1. Introduction Coal is an organic sedimentary rock and it suffered significant changes during their carbonification process. Coal is a readily combustible rock containing more than 50 percent by weight of carbonaceous material formed from compaction and indurations of variously altered plant remains similar to those in peat [1]. The Mexican coals that have been more explored and developed, because of their economic potential, are the Maestrichtian coals in the Coahuila State. Most of the coals in the Sabinas and Monclova sub-basins are metallurgical, whereas the coals from the Fuentes – Río Escondido basins are steam coals (long flame type); the latter ones are being used by the Mexican government company (Comision Federal de Electricidad, CFE) to generate electricity in their plants of Nava, Coahuila. Total annual production of steam and metallurgical coal of the State of Coahuila, is approximately 15.4 million metric tons, 6 million is metallurgical coal and 9.4 million is steam coal used to generate electricity [2]. The Sabinas Basin in Mexico contains Upper Cretaceous (Maastrichtian Age) very gassy coals (the Double Seam) in the Olmos F
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