Devonian micritic limestones used in the historic production of Prague hydraulic lime (‘pasta di Praga’): characterization of the raw material and experimental laboratory burning

P. Kozlovcev; R. Přikryl

doi:10.3989/mc.2015.06314

Autores/as

P. Kozlovcev Charles University in Prague
R. Přikryl Charles University in Prague

DOI:

https://doi.org/10.3989/mc.2015.06314

Palabras clave:

Caliza, Cal, Silicato bicálcico, Microscopía Electrónica de Barrido (MEB), Difracción de rayos X (DRX)

Resumen

Las calizas micríticas devonianas provenientes de la Cuenca de Praga (área de Barrand, macizo de Bohemia, República checa) que fueron la principal materia prima utilizada para la producción de la cal hidráulica natural calcinada en Praga, presentan un carácter hidráulico desde débil hasta alto. El estudio experimental de laboratorio, ha determinado que el producto calcinado está compuesto de cal viva (CaO) como componente predominante y/o cal hidratada (Ca(OH)₂), larnita-belita (silicato bicálcico 2CaO.SiO₂) y cuarzo (SiO₂) – es decir, fases formadas como resultado de la descomposición de carbonato y cuarzo presentes en las calizas originales. Las proporciones de las nuevas fases formadas dependen de: la composición de la materia prima, temperatura máxima de calcinación (la mayor cantidad de larnita-belita se produce a la temperatura de calcinación de 1200 °C), y la granulometría de las muestras (las muestras con granulometría gruesa presentaron mayor cantidad de belita que las de granulometría fina). La presencia de bajas cantidades de filosilicatos en la materia prima contribuyó a la formación de gehlenita, brownmillerita, wollastonita, calcio aluminoso, y/o spurrita.

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