Preparation of β-belite using liquid alkali silicates

P. Koutník

doi:10.3989/mc.2017.10816

Autores/as

P. Koutník Unipetrol Centre for Research and Education https://orcid.org/0000-0002-3486-5577

DOI:

https://doi.org/10.3989/mc.2017.10816

Palabras clave:

Silicato bicálcico, Álcalis, Humo de sílice, Caliza, Difracción de rayos X (DRX)

Resumen

El objetivo de este estudio ha sido la preparación de β-belita por reacción en estado sólido usando caliza, sílice amorfa y silicatos alcalinos líquidos. Las materias primas se mezclaron y posteriormente, se aglomeraron y calcinaron. Los productos se caracterizaron mediante difracción de rayos X y microscopía electrónica de barrido. Se determinó el contenido de cal libre en la β-belita. Se ha estudiado el efecto de la relación CaO/SiO₂ (1.6–2.1), temperatura de combustión (800–1400 °C), utilización de diferentes materias primas y el tiempo de combustión sobre el contenido de cal libre en el producto. La β-belita más pura se preparó a partir de la mezcla de piedra caliza en polvo, humo de sílice y silicato de potasio líquido con relación CaO/SiO₂ = 2 a temperaturas entre 1100 y 1300 °C durante más de 2 horas. La disminución de la relación CaO/SiO₂ produjo rankinita y una temperatura de combustión más baja produjo wollastonita.

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