Preparation of β-belite using liquid alkali silicates

Authors

DOI:

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

Keywords:

Dicalcium silicate, Alkali, Silica Fume, Limestone, X-ray Diffraction (XRD)

Abstract


The aim of this study is the preparation of β-belite by a solid-state reaction using powdered limestone, amorphous silica and liquid alkali silicates. The raw materials were blended, the mixtures were agglomerated and then burnt. The resulting samples were characterized by X-ray diffraction analysis and scanning electron microscopy. Free lime content in the β-belite samples was also determined. The effects of CaO/SiO2 ratio (1.6–2.1), burning temperature (800–1400 °C), utilization of different raw materials (silica fume, synthetic silica, potassium silicate, sodium silicate, potassium hydroxide) and burning time (0.5–16 h) on free lime content and mineralogical composition were investigated. The purest ?-belite samples were prepared from a mixture of powdered limestone, silica fume and liquid potassium silicate with a ratio CaO/SiO2 = 2 by burning at temperatures between 1100 and 1300 °C for more than 2 h. Decreasing of the CaO/SiO2 ratio led to rankinite formation and lower a burning temperature led to the formation of wollastonite.

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Published

2017-12-30

How to Cite

Koutník, P. (2017). Preparation of β-belite using liquid alkali silicates. Materiales De Construcción, 67(328), e140. https://doi.org/10.3989/mc.2017.10816

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Section

Research Articles