南非块、PB块与澳块的热裂行为  

DECREPITATION BEHAVIOR OF SOUTH AFRICA,PB AND AUSTRALIA LUMP ORE

作　　者：曾子浩 佘雪峰 李丽红 刘燕军 王艾军 Zeng Zihao;She Xuefeng;Li Lihong;Liu Yanjun;Wang Aijun(State Key Laboratory of Advanced Metallurgy,University of Science and Technology Beijing,Beijing 100083;Delong lron and Steel Co.,Ltd.,Xingtai 054009,Hebei;Hebei Hot Rolled Strip Technology Innovation Center,Xingtai 054009,Hebei)

机构地区：[1]北京科技大学钢铁冶金新技术国家重点实验室,北京100083 [2]德龙钢铁有限公司,河北邢台054009 [3]河北省热轧板带钢技术创新中心,河北邢台054009

出　　处：《河北冶金》2024年第10期34-39,54,共7页Hebei Metallurgy

基　　金：国家自然科学基金资助项目(U1960205);钢铁冶金新技术国家重点实验室基金(41621021)。

摘　　要：近年来,钢铁行业通过提高入炉块矿的使用比例,以达到降本增效、节能减排的目的。但块矿热裂产生的粉末易降低高炉中上部的透气性,从而影响高炉顺行。对块矿热爆裂性能的研究,有利于为生产时的原料配比提供试验依据。本文以南非块、PB块与澳块为研究对象,系统研究了加热温度、加热时间、高温预处理对块矿热裂性能的影响,以及块矿热裂后在外应力挤压摩擦下,再次产生粉末的能力。试验结果表明:块矿的热爆裂程度与结晶水含量和烧损呈正相关。温度越高,热爆裂情况越严重,南非块的热爆裂指数受温度的影响比PB块、澳块小,其抗高温爆裂性能更强;随加热时间的延长,热爆裂指数增加,热爆裂指数在前10 min变化幅度较大,后20 min变化幅度较小;高温预处理减少了块矿结晶水含量,使得块矿内部的应力得到有效缓解,进而抑制热爆裂的发生,PB块和澳块在400℃下预热60 min后,热爆裂指数分别为1.52%和0.86%,热爆裂指数明显降低。此外,PB块、澳块再次产生粉末的能力更强。In recent years,the steel industry has achieved the goal of cost reduction,efficiency improvement,energy conservation,and emission reduction by increasing the proportion of ore used in furnaces.However,the powder generated by thermal cracking of lump ore can easily reduce the permeability of the upper part of the blast furnace,thereby affecting the smooth operation of the blast furnace.The study of the thermal decrepitation performance of lump ore is beneficial for providing experimental basis for the raw material ratio during production.This article takes South African,PB and Australian lump ores as research objects,systematically studying the effects of heating temperature,heating time,and high-temperature pretreatment on the thermal decrepitation performance of lump ores,as well as the ability of lump ores to produce powder again under external stress extrusion friction after thermal cracking.The experimental results show that the degree of thermal decrepitation of lump ore is positively correlated with the content of crystal water and burning loss.The higher the temperature,the more severe the thermal decrepitation situation.The thermal decrepitation index of South African lump ore is less affected by temperature than PB and Australianlump ores,and their resistance to high temperature decrepitation is stronger.As the heating time increases,the thermal decrepitation index increases,with a larger change in the first 10 minutes and a smaller change in the second 20 minutes;High temperature pretreatment reduces the crystal water content of the lump ore,effectively relieving the internal stress of the lump ore and suppressing the occurrence of thermal decrepitation.After preheating at 400℃for 60 minutes,the thermal decrepitation indices of PB and Australian lump ores were 1.52%and 0.86%,respectively,indicating a significant decrease in thermal decrepitation indices.In addition,PB ores and Australian ores have a stronger ability to generate powder again.

关 键 词：块矿 热爆裂指数 加热温度 加热时间 高温预处理 

分 类 号：TF53[冶金工程—钢铁冶金]