配加预处理脱硫灰对铁矿烧结基础特性的影响  

Effect of pretreatment sintering desulfurization ash addition on basic sintering characteristics of iron ore

作　　者：罗云飞 钱立新 龙红明 章裕东[1] 魏汝飞 LUO Yun-fei;QIAN Li-xin;LONG Hong-ming;ZHANG Yu-dong;WEI Ru-fei(School of Metallurgical Engineering,Anhui University of Technology,Ma'anshan 243002,Anhui,China;Anhui Province Key Laboratory of Metallurgy Engineering and Resources Recycling(Anhui University of Technology),Ma'anshan 243002,Anhui,China)

机构地区：[1]安徽工业大学冶金工程学院,安徽马鞍山243002 [2]安徽工业大学冶金工程与资源综合利用安徽省重点实验室,安徽马鞍山243002

出　　处：《钢铁》2019年第12期117-124,共8页Iron and Steel

基　　金：国家自然科学基金资助项目(51674002,51704004);安徽省自然科学基金资助项目(1808085QE133)

摘　　要：半干法脱硫灰堆弃处理占用土地且容易造成二次污染,将脱硫灰预处理后替代CaO熔剂配入烧结有望充分利用其中的熔剂组分,实现脱硫灰在钢铁企业的闭路资源化利用。研究了脱硫灰配加焦粉加热分解特性及替代CaO熔剂配加对铁矿粉烧结基础特性的影响。结果表明,配加1%焦粉可以有效提高脱硫灰分解率,减少CaSO4的生成。随着预处理脱硫灰替代CaO比例的增加,铁矿粉同化温度和黏结相强度呈现先增加后减小的趋势;液相流动性呈现单调增加趋势,当替代比超过40%时,液相流动性形成了流动性很大的"假象";黏结相微观结构表明,替代比例小于40%时,有利于烧结试样中铁酸钙的生成;综合考虑,最佳的替代比例应小于40%。The most commonly used stacking disposal method of the sintering flue gas semi-dry desulfurization ash takes up land and is prone to secondary pollution.A technical idea of using the pre-treatment desulfurization ash to add into the sintering raw materials by replacement the CaO flux so as to make full use of the flux components was proposed,expecting to realize the closed-circuit resource utilization of the desulfurization ash in metallurgical enterprises.The thermal decomposition of desulfurized ash with carbon and the effect of the addition of pre-treatment desulfurization on the basic characteristics of the iron ore were studied.The results show that adding 1%coke powder can effectively improve the decomposition rate of desulfurization ash and reduce the generation of CaSO4.Meanwhile,with the increasing of the addition proportion of pre-treated desulfurized ash,the assimilation temperature and bond phase strength of the iron ore increases first and then decreases,and the liquid phase fluidity increases monotonously.However,when the substitution ratio exceeds 40%the liquid phase fluidity creates the "false appearance" of great fluidity.The phase structure of the binding phase indicates that the suggested substitution ratio is less than40%,which is beneficial to the formation of calcium ferrite in the quenched sample.Therefore,the best substitution ratio should be less than 40%.

关 键 词：半干法脱硫灰 预处理 铁矿烧结 基础特性 

分 类 号：X70[环境科学与工程—环境工程]