Double Basicity Sinter Production And Application

At present many domestic iron and steel enterprises are improving sinter dosage toreduce ironmaking cost. Using double basicity sinter (high basicity sinter collocation acidsinter) can increase the proportion of sintering ore to100%. It is an important attempt tooptimize BF burden structure ation and reduce ironmaking cost in recent years.Under the conditions of laboratory equipment and raw material, this experimentexamines the basic sintering parameters of binary basicity R within the range of0.04~3.0on the basis of a small sintering cup sintering test. The firing rate does not change greatlywithin the range at an average of76%. With the improvement of the basicity, thecompressive strength shows a v-shaped variation, and low ebb appear in the R=1.3,about8MPa. This experiment chooses nine kinds of representative basicity to test themetallurgical performance of sinter, the metallurgy function of which can meet thedemant of blast furnace. Soft fusibility research shows, with the improvement of basicity,softening start temperature TSdoesn’t change greatly, but drain start temperature TDobviously increases. The obvious rising inflection point appears in R=2.0andaccordingly soft melting range ΔT=T_D-T_S has widened.The property of2.0basicity sinter, which has been widely applied in industry,mixing it with0.04,0.3,0.7basicity sinter, field pellets, and field lump ore respectivelyby1/1collocation, five kinds of soft melting performance of hybrid burden are obtained.The mean of soft melting interval ΔT of three kinds of double basicity sinter mix burdenis233℃. The mean of two kinds of the burden is268℃. The differenceis35℃,and softmelting temperature interval reduces about13%. Under the condition of constant furnacetemperature distribution, cohesive zone becomes thinner.For the target of soft fusibility consistency or tolerance, collocating double basicitysinter can thin blast furnace cohesive zone thickness, improve the stock column gaspermeability and the use effect of double basicity sinter.