Patent ID: 6755905
Filing Date: 2004-06-29
Classification: C04B,F27B,F27D,Y02P

Abstract:
A method of producing a calcium aluminosilicate synthetic slag from a source of lime and coal ash comprising:a) melting an inorganic material providing a source of lime and a coal ash at a temperature of 1200Â° C. to 1650Â° C. and reacting lime and coal ash to form a molten calcium aluminosilicate synthetic slag, b) adding additional amounts of said inorganic material and said coal ash having a carbon content of 5 to 30% by weight to said molten slag, c) jetting an oxygen containing gas into said molten slat to anitate said molten slag and disperse the gas therein and oxidising the carbon content of said coal ash in said molten slat with said gas in an exothermic reaction with generation of heat and carbon dioxide and exploiting the generated heat in the melting and reacting of said additional amounts to produce a melt of molten calcium aluminosilicate synthetic slat and d) recovering said synthetic slaa from said melt, said inorganic material and coal ash being employed to provide a molar ratio of SiO2and Al2O3 to CaO of 1 to 2.5:1 to form said calcium aluminosilicate synthetic slag.