manufacturing
process of
st. astier limes
Mining
St. Astier Natural Hydraulic Limes (NHLs) are produced from limestone extracted from the company's own quarries in Western France. The limestone is blasted using controlled explosions, forming underground tunnels. At present, these tunnels extend for over ten hectares.
Once extracted, the stone is crushed to prepare it for burning.
Burning
The limestone is now burned in vertical-feed kilns to form quicklime.
The fuel used is Anthracite coal, ensuring efficient burning with minimum residue and sulphate content.
Hydration & Slaking
After burning, the quicklime is hydrated, releasing great heat.
The hydrated lime is then allowed to form slaked lime in slaking silos.
Milling
The slaked lime is now filtered. That which does not meet the desired degree of fineness is crushed by a ball mill to homogenise the fineness of the slaked lime.
Delivery
The lime is now bagged and delivered to St. Astier distributors, including The Traditional Lime Company.
For additional information on St. Astier lime products, please visit the St. Astier website.
hydraulic limes 
introduction
why NHLs?
manufacture
NHL 5
NHL 3.5
NHL 2
ecomortar
prompt