Patent ID: 7595037

Claim:
Method for hydration of a particulate or pulverulent material containing CaO, the method comprising: adding water to a particulate or pulverulent material containing CaO, wherein the water is added in a quantity which will ensure that the partial pressure P H2O of the added water as a function of the temperature (° C.) is maintained within the interval defined by the formula 6 , 85 - 5459 ( T + 273 ) < log ⁢ ⁢ P H 2 ⁢ O < 5 , 45 - 2032 ( T + 273 ) , where P H2O is the partial pressure of water vapor in atm. and T is the temperature in ° C., and wherein the hydration of CaO takes place in an atmosphere containing the maximum amount of water vapor in which the temperature is maintained above 200° C. and the partial pressure of the water vapor is from 0.9 to 1.1 atm.