刚玉砖抗高磷鲕状赤铁矿还原物料的侵蚀与渗透研究  

Corrosion and penetration resistance of corundum bricks to high phosphorus oolitic hematite reducing materials

作　　者：范敦城 张玉燕[2] 倪文[1] 

机构地区：[1]北京科技大学金属矿山高效开采与安全教育部重点实验室,北京100083 [2]工业和信息化部赛迪研究院工业节能与环保研究所,北京100846

出　　处：《耐火材料》2015年第6期401-405,共5页Refractories

基　　金：国家自然科学基金项目(51134002)

摘　　要：为考察刚玉砖是否适用于高磷鲕状赤铁矿直接还原的炉底,将还原物料高磷鲕状赤铁矿、烟煤、Ca(OH)_2和Na_2CO_3按质量比为1 0.15 0.15 0.03混匀后压制成15 mm×20 mm的含碳圆柱试样,置于刚玉砖上,一起放入高温管式炉内分别于1 200℃保温40、60、80、140和220 min进行还原试验,采用XRD、SEM及EDS研究了刚玉砖抗高磷鲕状赤铁矿还原物料的侵蚀与渗透行为。结果表明:还原物料在还原过程中形成的还原渣侵蚀刚玉砖表面而形成钙长石和铁尖晶石产物层,抑制了还原渣的侵蚀;而已渗透至砖内的还原渣,在向砖内部扩散迁移过程中生成钙长石和铁尖晶石,起到填充与堵塞孔缝的作用,阻碍了还原渣的渗透。The paper aims at investigating whether corundum bricks can be used for the bottom of the direct reduction furnace of high phosphorus oolitic hematite. The reducing materials including high phosphorus oolitic hematite,bitumite,Ca（ OH）_2 and Na_2CO_3 at a mass ratio of 1 0. 15 0. 15 0. 03 were mixed and pressed into carbon containing cylindrical specimens with the size of 15 mm × 20 mm. The specimens were placed on the corundum bricks and reduced in a high temperature tube furnace at 1 200 ℃ for 40,60,80,140 and 220 min,respectively. The corrosion resistance and penetration resistance of corundum bricks to high phosphorus oolitic hematite reducing materials were analyzed with XRD,SEM and EDS. It shows that the reducing slag formed in the reduction process corrodes the surface of corundum bricks to form a product layer of anorthite and hercynite,retarding the further corrosion of the reducing slag; the reducing slag which has penetrated into the interior of the brick goes through the gaps between the particles and generates anorthite and hercynite,filling the gaps and hindering the reducing slag penetration.

关 键 词：刚玉砖 高磷鲕状赤铁矿 熔融还原炼铁 钙长石 侵蚀 渗透 

分 类 号：TQ175.712.2[化学工程—硅酸盐工业] TF065[冶金工程—冶金物理化学]