返矿对烧结过程和烧结矿质量影响的研究

混匀矿中返矿的比率约为25%～50%。如此大比例的返矿会对烧结过程和烧结矿质量产生很大影响。研究旨在揭示返矿量和焦粉量变化的影响。研究采用了因子设计方法,研究表明返矿的产生主要取决于烧结混合料中的固体燃料和返矿比例,增加混合料中的返矿配入量会减少烧结过程中的返矿发生量。烧结过程效率随着混合料中返矿比例的增加而提高(最适宜的混合碱度为1.6)。研究表明,要确保返矿平衡率在90%～110%的范围内,混合料中返矿配比最高不能超过35%,最小不能<25%。

Investigations on the influence of return sinter fines on the iron ores sintering process and on the properties of iron ore sinter

Iron ore sintering blend includes a large part of return sinter fines which ranges from 25 to 50 wt%.Such large variations in the content of return sinter fines are bound to influence the sintering process and quality of sinter produced.The purpose of the investigations presented in the article is to determine the effect of variations in the content of return sinter fines in the sinter blend with the simultaneous variations in the blend basicity and the content of breeze coke in the blend on sintering process and sinter mechanical properties.The Factors Design Plan was employed in the investigation.Investigations have shown that the generation of return sinter fines depends most on the quantity of fuel in a sintering blend and share of return sinter fines in the blend.Increasing the amount of return sinter fines in the sintered blend causes a reduction in the quantities of return sinter fines generated in sintering process.The efficiency of the process of sintering increases in proportion to the quantity of return sinter fines in the sintered mixture (the best results at blend basicity equal to 1.6).It was established that the maximum amount of return sinter fines in the sinter blend,ensuring the balance for the return sinter fines in the range of 90%-110% should not exceed 35 wt% and the minimum amount should not be lower than 25 wt%.