湘钢烧结低水制粒技术开发与应用

Development and Application of Low Water Granulation Technology of Sintering in Xiangtan Steel

通过对烧结适宜水分判据的分析与制粒小球水分控制模型的研究,确定了低水制粒方法。研究了澳洲精矿、南非精矿、安徽精矿等三种精矿的相对比例对粘附粉间孔隙率的影响,采用这三种铁精矿对粘附粉的粒度进行调控,通过调控粘附粉含量及其持水量,调控返矿等核颗粒的吸水量,将烧结制粒水分由6.8%降低到6.2%左右,烧结混合料堆密度增加,孔隙率降低,促进了烧结固相反应的进行,烧结矿产质量提升;烧结矿转鼓强度提升2%,内返矿率下降5%,利用系数提高6.6%,固体燃耗下降0.44 kg/t。

The suitable moisture plays four roles in the sintering process:heat conduction,granulation,lubrication and combustion supporting,the most suitable moisture content in sintering process is determined by making the mixture have the highest balling rate or the maximum permeability of the original material layer.The influence of the relative proportion of Australian concentrate,South African concentrate and Anhui concentrate on the porosity of adherent powder was studied;these three kinds of iron concentrates are used to control the particle size of the adhesive powder.Through the analysis of the suitable moisture criterion for sintering and the study of the moisture control model for pelletizing pellets,the low water granulation method was determined.By adjusting the content and water holding capacity of adhesive powder,regulating the water absorption of return ore and other core particles,the moisture content of sintering granulation was reduced from 6.8%to about 6.2%,bulk density of sinter mixture was increased,porosity was reduced,solid-state reaction of sintering was promoted,sinter output and quality were improved.Sinter drum strength was increased by 2%,internal ore return rate was reduced by 5%,the utilization coefficient was increased by 6.6%,and the solid fuel consumption was decreased by 0.44 kg/t.