The main differences between hydrated lime & quicklime are their reactivity & their chemical composition. Hydrated lime and quicklime are both calcium compounds. In its hydrated state, calcium is called calcium hydroxide, and in its pure state it is called calcium oxide, or quicklime. Calcium oxide has a heavy density (65lb/ft³) and is more reactive than hydrated lime.

To simplify, hydrated lime is the result of adding water to powdered quicklime, putting it in a kiln or oven, and then pulverizing it with water. The resulting lime has a density of 35lb/ft³, and is called calcium hydroxide.

It is necessary for calcium oxide (quicklime) to be slaked in a controlled environment because it can create heat that reaches up to 120 degrees Fahrenheit. Calcium hydroxide, or hydrated lime, is already neutralized, so it will not undergo oxidation and can be used with water, for water ph control, lime slurry addition, lime slurry mixes, soil rehabilitation and more.

How do you determine whether to use hydrated lime or quicklime?

If dry, the process feed rate determines the choice between using hydrated or quicklime. Just remember that quicklime is more “reactive” than hydrated lime. However, in some processes, hydrated lime is not suitable even if we inject it dry, and vice versa with quicklime.

Unslaked lime-containing process binder – produced by baking of carbonate rocks.

Divided into three types:

  1. Lumpy – fractional composition (60-100мм) meets the requirements of process chart of TSh 21-83: 2003. Used for preparation of building mortars and concretes, binders and building products .
  2. Crushed – fractional composition (5-35mm) meets the requirements of ITD TSh21-83: 2003.
  3. Milled – dispersion degree no higher than 15% meets the requirements of ITM TSh 121-83 2003. Used to neutralize the soil and wastewater.

Мероприятия calendar icon

Click to listen highlighted text! Powered by GSpeech