GRANULATED SLAG-FORMING MIXTURE PREPARATION METHOD Russian patent published in 2006 - IPC B22D11/00 B01J2/02 

FIELD: preparation of granulated slag-forming mixtures used at continuous casting of steels.

SUBSTANCE: method comprises steps of disintegrating ingredients and agitating them in aqueous suspension; adding lignosulphonate and carboxymethyl cellulose; granulating mixture and subjecting granules to heat treatment in drying chamber at temperature 150-400°C. Granulation is realized by spraying suspension to drying chamber into medium of combustion products of natural gas and air mixture with relation 1 : (1.1 - 1.5). At first temperature of heat treatment of granules is uniformly increased from minimum temperature 150°C till maximum temperature 400°C. Then temperature is uniformly decreased from maximum value 400°C till minimum value 150°C at outlet of drying chamber.

EFFECT: improved strength of granules to abrasion in order to achieve high quality of surface of continuously cast billets, increased metal yield.

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