Introduction

High calcium hydrate

Hydrated lime (or calcium hydroxide, or slaked lime) is usually a dry powder resulting from the controlled slaking of quicklime with water. The exothermic or released heat of reaction is captured and used to evaporate the excess slaking water. For "slurry lime" excess water is not evaporated and the hydrate remains as a water suspension

Chemical formula: Ca(OH)2



High calcium hydrate (or calcium hydroxide, or slaked lime) is usually a dry powder resulting from the controlled slaking of quicklime with water. The exothermic or released heat of reaction is captured and used to evaporate the excess slaking water. For "slurry lime" excess water is not evaporated and the hydrate remains as a water suspension Chemical formula: Ca(OH)2 Available products: Normal, slurry, or high-porosity (Spongiacal®, Wülfrasorb®)

Dolomitic hydrate
Dolomitic hydrate is manufactured from normal dolomitic quicklime under special hydrating conditions that control temperature and pressure. "Normal dolomitic" hydrate is made similar to high calcium and usually does not completely hydrate all the oxides; especially the magnesium oxide component. Pressure hydration of dolomitic quicklime insures that all the calcium and magnesium oxides are fully hydrated. At Chemical Lime, we commonly refer to the double hydrate dolomitic lime as "Type S" hydrate.

Process




High calcium quicklime readily reacts with water to form hydrated lime. The reaction is highly exothermic and the process is known as "slaking". The reaction is usually carried out in a "slaker" (a specially designed mixer) which, through a process of rigorous mixing, makes certain that all of the quicklime has come into intimate contact with water and no unreacted quicklime remains. From a general viewpoint the hydrated lime produced can be in the form of dry hydrate, putty slurry, or "milk of lime". (At Cheney Lime we produce the dry hydrated lime that is sold in bulk or bags.) The exothermic reactions are shown below: (There are various types of slakers available on the market.)

"High Calcium" Quicklime Hydration:

CaO + H2O ---> Ca(OH)2 + Heat

"Dolomitic" Quicklime Hydration:

Note: CaO will readily react with water under normal temperatures and pressures, whereas MgO will not.

We offer the best Quality products of Lime suitable for versatile uses. Consistency in Quality and suitability for customers are the major merits of our products. Our products are available under the following technical specification in which we can make available a different percentage of parameters like moisture, acid insoluble, mesh size, etc. than the one mentioned below according to the needs of customers.

Specification	93%	90%	85%	80%	75%	70%
Apperance	Brilliant white	Snow white	White	White	White	White
Av. Ca(OH)2	93.0 ± 0.50	90.0 ± 0.50	+ 85.0	+80.0	+75.0	+70.0
Moisture %	0.50 ± 0.20	0.70 ± 0.20	0.40 ± 0.15	0.40 ± 0.15	0.25	0.30
Magnesium (Mgo)	0.70 ± 0.20	0.80 ± 0.20	0.90 ± 0.30	1.05 ± 0.40	1.80 ± 0.50	2.90
Acid Insoluble As (SiO)2	0.20 ± 0.05	0.50 ± 0.05	1.25 ± 0.20	1.5 ± 0.20	5.0 ± 1.0	7.0
Particular size Mesh size	(BSS 300)  (-) 98 %	(BSS 200)  (-) 95 %	(BSS 200)  (-) 90 %	(BSS 100)  (-) 95 %	(BSS 100)  (-) 95 %	(BSS 100)  (-) 95 %