METHOD FOR CALCINATION OF POLYDISPERSION CARBONATE MAGNESIAN CRUDE MATERIAL Russian patent published in 2005 - IPC

FIELD: method for producing of metallurgical fluxes in fluidized bed, may be used in production and processing of cast iron and steel outside furnace.

SUBSTANCE: method involves providing heating and calcinations of crude material in heating, calcination and cooling zones of multiple-zone fluidized bed furnace; introducing fluxing iron-aluminum containing admixtures or mixtures thereof; heating crude material in first heating zone for 0.5-20.0 min to temperature of 300-450 C and holding for 20.0-39.5 min; heating crude material in second heating zone for 0.5-22.5 min to temperature of 500-750 C and holding for 22.5-44.5 min; heating crude material in calcination zone to temperature of 920-940 C for 0.5-45.0 min and calcining for flux for 45.0-89.5 min; cooling flux in cooling zone for 0.5-35.5 min to temperature of 250-400 C and holding for 30.0-65.0 min; introducing admixtures into space under grid and/or into space above layer of heating zones at temperatures of 350-450 C and/or 500-750 C and/or 250-400 C, respectively. Method allows weight part of MgO to be increased by 5.0-11.0% and of (CaO+MgO) by 4.0-11.0%, weight part of PMPP to be reduced by 4.0-8.0% and of admixture by 0.3-0.7%.

EFFECT: improved quality of calcinations of polydispersion carbonate magnesian crude material.

2 cl, 6 dwg, 1 tbl