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close this book Small Scale Production of Lime for Building
close this folder 1. General Information
View the document 1.1 Geological description of limestone
View the document 1.2 Chemical composition of limestone
View the document 1.3 Physical characteristics of limestone
View the document 1.4 Classification of limestone
View the document 1.5 Chemical reactions in the production of lime
View the document 1.6 Common uses of lime in developing countries

1.5 Chemical reactions in the production of lime

Calcination

A. High calcium limestones:

CaCO3 + heat ® CaO + CO2­

B. Magnesian limestones:

CaMg (CO3)2 + heat ® CaCO3 + MgO + CO2­ ­ (at around 750 °C)

CaCO3 + heat ® CaO + CO2­ ­ (at around 1100 °C)

Hydration

CaO + H2O ® Ca(OH)2 (water)

MgO + H2O ® Mg(OH)2 (water)

Simply stated, limestone plus heat produces quicklime and quicklime plus water produces lime hydrate.