Patent ID: 6245315
Filing Date: 2001-06-12
Classification: C04B,Y02P

Abstract:
A process for the production of high density hydration resistant sintered lime which comprises washing limestone having impurities of less than 2% to remove external impurities, crushing the washed limestone to a size of 25 mm or below, calcining the limestone at a temperature in the range of 1000 to 1150.degree. C. for a period in the range of 2 to 3 hours to form a calsin, hydrating the calcined mass, drying the hydrated mass deagglomerating the dried hydrated mass, mixing with the dried hydrated mass 1 to 4 weight percent of an additive which is selected from the group consisting of transition metal oxide capable of forming a low melting compound, rare earth metal oxide capable of forming a solid solution, and mixtures thereof, pelletizing the resultant mixture at a pressure of at least 1000 Kg/cm.sup.2, sintering the pellets so obtained at a temperature in the range of 1500.degree. C. to 1650.degree. C. for a period in the range of 2-4 hours and allowing the resultant sintered pellets to cool.