Title

MECHANISM OF SO2 ADSORPTION BY MIXTURE BED LAYER DURING IRON ORES SINTERING

MECHANISM OF SO2 ADSORPTION BY MIXTURE BED LAYER DURING IRON ORES SINTERING

Authorship

Ruan, Zhiyong; Pan, Jian; Zhu, Deqing; Chun., Tiejun

Ruan, Zhiyong

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Pan, Jian

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Zhu, Deqing

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Chun., Tiejun

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DOI

10.5151/2594-357X-22230

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Abstract

The emission of SO2 rises to a peak value rapidly just before the sintering end point and declines dramatically no matter how parameters of sinter technology and the properties of raw material change. And the emission of SO2 is controlled by the mechanism of transfer and cycling enrichment which consists of sulphide and sulphate pyrogenation formation–sinter bed adsorption–repyrogenation–desorption of SO2. It is revealed that the self-sustaining characteristics of SO2 emission is resulted from the selectively adsorbing SO2 by sinter bed.While in iron ores sintering, SO2 in the flue gas originates from the pyrogenation and oxidation of sulphur compounds in iron ores and coke breeze at high temperature,and the sinter mixture has a strong adsorption for SO2. In this paper the adsorption mechanism and kinetics of sinter bed adsorbing SO2 were studied by adopting dynamic methods. The results show that the relationship between adsorptive rate and adsorption capacity (A) agrees linearly with the first order reaction kinetics equation at low adsorption capacity. Meanwhile, at the initial stages of adsorbing, the multiphase reaction of blends adsorbing SO2 is enhanced by an increase of basicity, especially with CaO originating from burnt lime.

The emission of SO2 rises to a peak value rapidly just before the sintering end point and declines dramatically no matter how parameters of sinter technology and the properties of raw material change. And the emission of SO2 is controlled by the mechanism of transfer and cycling enrichment which consists of sulphide and sulphate pyrogenation formation–sinter bed adsorption–repyrogenation–desorption of SO2. It is revealed that the self-sustaining characteristics of SO2 emission is resulted from the selectively adsorbing SO2 by sinter bed.While in iron ores sintering, SO2 in the flue gas originates from the pyrogenation and oxidation of sulphur compounds in iron ores and coke breeze at high temperature,and the sinter mixture has a strong adsorption for SO2. In this paper the adsorption mechanism and kinetics of sinter bed adsorbing SO2 were studied by adopting dynamic methods. The results show that the relationship between adsorptive rate and adsorption capacity (A) agrees linearly with the first order reaction kinetics equation at low adsorption capacity. Meanwhile, at the initial stages of adsorbing, the multiphase reaction of blends adsorbing SO2 is enhanced by an increase of basicity, especially with CaO originating from burnt lime.

Keywords

Iron ore sintering; SO2 flue gas; Abatement emissions of flue gas; Adsorption.

Iron ore sintering; SO2 flue gas; Abatement emissions of flue gas; Adsorption.