Influence of operational conditions on dust emission from sintering bed

Abstract

Dust emission is an environmental concern to iron ore sintering. To suppress it by preventing dust from migrating into gas stream in the sintering bed, the effect of various operational factors was investigated and the site and cause of dust generation in sintering bed were estimated through pot tests with a dust sampler placed between the pot and the wind box. Dust emission increased with increasing coke content or decreasing moisture; suction pressure, bed height and blend ratio of Marra Mamba ore did not affect significantly. Of 750mg/kg dust emitted from bed, about 150mg/kg originated in the drying zone, another 150 mg/kg in the dehydration zone and the rest in the coke combustion zone. The dominant causes allowing particles to move into gas stream in the bed was estimated to be granule's breakage in the drying/dehydration zones and extinction of adjacent particles in the combustion zone. © 2007 ISIJ.