We have the lime hydration experience


With over 100 years of experience in serving the minerals and chemical processing industries, Metso has developed the capabilities and know-how to recommend, design, and build the lime hydrating system best suited for the specific requirements of each client.


  • Years of experience with lime and hydrating systems
  • Control systems for entire facility
  • True understanding of process conditions
  • In house engineering for custom fit applications
  • One source supply of complete systems

Technical overview

Lime hydrate or hydrated lime is the reaction product of quicklime and water. Depending on the quicklime used – high calcium, usually containing CaO, plus 0.5 to 2.5 % MgO, magnesia or dolomitic quicklime, usually containing CaO plus 35.0 to 40.0% MgO – the hydrates are calcium hydroxide (Ca(OH)2) or mixtures of calcium hydroxide (Ca(OH)2) and magnesium hydroxide (Mg(OH)2).

The reaction between CaO and H2O takes place under atmospheric pressure, while the reaction between MgO and H2O requires a pressurized environment. Both reactions are exothermic.


Lime info

For deeper knowledge see "Learn more about lime hydration" on the right hand under Related Stories.

Brochure Lime hydration - English Download

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