Publicado

2014-07-01

Coal acid mine drainage treatment using cement kiln dust

Tratamiento de drenaje ácido de minería de carbón usando polvo de horno de cemento

DOI:

https://doi.org/10.15446/dyna.v81n186.38834

Palabras clave:

Acid Mine Drainage, Sulphate Removal, Cement Kiln Dust, Synthetic Gypsum (en)
Drenaje Ácido de Minería, Remoción de Sulfatos, Polvo de Horno de Cemento, Yeso Sintético (es)

Autores/as

  • Edgar Alberto Martínez Cementos Argos S.A.
  • Jorge Iván Tobón Universidad Nacional de Colombia
  • Juan Guillermo Morales Cementos Argos S.A.
Sulphurs are present in different rocks. During mining activities and the sulphur removal processes Acid Mine Drainage (AMD) may be produced, by sulphate ions (SO42-) in solution. AMDs are the main source of pollution from mining operations and in Colombia their discharge into natural bodies of water must comply with national environmental regulations (pH between 5 and 9). Cement Kiln Dust (CKD), with calcium carbonate as its main component, from a Cementos Argos S.A. plant was used to neutralize an AMD generated through a coal bio-desulphurization process. Neutralized AMDs had pH values between 7.72 - 8.05 and the sulphates removal ranged from 67% to 70%. Precipitated sludge was dried and analyzed in order to determine its chemical and mineralogical composition. Moisture content was between 69% and 81%; this precipitated material was composed of gypsum with approximately 50% purity, as well as calcium carbonate. This composition makes it suitable for use in cement production.
Los sulfuros están presentes en distintas rocas. Durante las actividades mineras y el proceso de remoción de sulfuros se pueden producir Drenajes Ácidos de Minería (DAM), con iones de sulfato (SO4-2). Los DAMs son fuente de polución en las actividades mineras y en Colombia su descarga en los cuerpos de agua debe cumplir las regulaciones nacionales (pH entre 5 y 9). Polvo de horno cementero (CKD), con carbonato de calcio principalmente, de una planta de Cementos Argos S.A. fue usado para neutralizar un DAM generado en la biodesulfurización de carbón. Los DAMs neutralizados tuvieron pHs entre 7,72 y 8,05 y la eliminación de sulfatos entre 67% a 70%. El precipitado se secó y analizó para determinar su composición química y mineralógica. Se encontró humedad entre 69% y 81%; yeso con un 50% de pureza aproximadamente y carbonato de calcio. Esta composición lo hace adecuado para uso en la producción de cemento.

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Citas

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