Impurities In Limestones

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Impurities in Limestones

1. Magnesium Carbonate:-

  • The magnesium Limestones are hard, heavy and Compact in texture.
  • The magnesium Limestones display irregular properties of calcination, Slaking and hardening
  • Upto 5% of magnesium oxide imparts excellent hydraulic in properties to the lime

2.Clay:-

  • It is mainly responsible for the hydraulic properties of lime.
  • The percentage of clay to produce hydraulicity in lime stone usually varies from 10 to 30.
  • Limes Containing 3-5 percentage of clay do not display any hydraulic properties and do not set and harden under water.

3.Silica:-

In its free from it has a detrimental effect of the properties of lime.

4.Iron Compounds:-

  • Iron occurs in small proportions as oxides, carbonate and sulphides.
  • Pyrite or iron sulphides is regarded to be highly undesirable.
  • For hydraulic limes 2-5% of iron oxide is necessary.

5. Sulphates:-

Sulphates if present slow down the Slaking  action and increase the settings raye of limes.

6. Alkalis:-

When pure lime is required the alkalis are undesirable. However up to 5% of alkali in hydraulic lime do not have any ill effects.

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