Patent ID: 6752865
Filing Date: 2004-06-22
Classification: C04B

Abstract:
A process for the manufacture of high iron hydraulic cement clinker wherein Fe2O3 is at least 33% using a down draft sintering technique which comprises:preparing a homogenous raw mixture of raw materials selected from limestone, lime, lime sludge, lime bearing solid wastes, iron ore, slime red mud, ferruginuous bauxite, laterite, clay, iron oxide containing metallurgical and chemical wastes, slag, coke breeze, coal char, carbonaceous sludge, carbon bearing solid wastes and any mixture thereof, wherein the chemical ratio of CaO/(Al2O3+Fe2O3), SiO2/(Al2O3+Fe2O3) and (Al2O3+Fe2O3) in the homogenized raw mixture is between 1.3 to 2.5, 0.2 to 0.5 and 0.25 to 0.8 respectively, with the content of Fe2O3 in the homogenized raw mixture being in the range of less than 40% and the content of solid carbon in the homogenized raw mixture being in the range of between 4 to 12%, pelleting the resultant homogenized raw mixture in the presence of water to prepare granulated particles, sintering and cooling the pelletized granulated particles by down draft sintering technique to convert into clinker, grinding the clinker particles with and without gypsum to make high iron hydraulic cements and binders for different applications.