Abstract: In order to promote the further development and application of the HIsmelt process,based on the characteristics of smelting reduction vessels (SRV) of the HIsmelt process,a static crucible method was used to compare the corrosion of iron slag from the SRV on chrome-corundum bricks,microporous corundum-mullite bricks,corundum-mullite bricks,and corundum-spinel bricks at 1 500 ℃.The results indicate that:(1)the chrome-corundum brick has the strongest resistance to SRV slag,because FeO reacts with Al₂O₃ and Cr₂O₃ in the brick to form a high melting point substance,which inhibits the penetration and corrosion of the slag;(2)the formed magnesium-aluminate spinel and gehlenite in microporous corundum-mullite bricks form a protective film in the corrosion layer to prevent the penetration and corrosion of SRV slag;among the three chrome-free materials,the microporous corundum-mullite brick shows the best corrosion resistance;(3)the formation of large amounts of anorthite in the corundum-mullite brick generates gaps,thus corrosion becomes severe for the continuous slag penetration;(4)the spinel grains with small particle sizes and high activity are in-situ generated in the corundum spinel brick,which effectively absorb iron ions in the slag to form magnesium-aluminum-iron composite spinel,blocking the corrosion of SRV slag.

Key words: HIsmelt process, smelting reduction vessels, chrome-corundum brick, microporous corundum mullite brick, corundum-mullite brick, corundum-spinel brick

摘要： 为促进HIsmelt工艺的进一步发展和应用,根据HIsmelt工艺熔融还原炉(SRV)的特点,利用静态坩埚法对比研究了SRV渣在1 500 ℃下对铬刚玉砖、微孔刚玉-莫来石砖、刚玉-莫来石砖、刚玉-尖晶石砖的侵蚀。结果表明:1)铬刚玉砖抗SRV渣渗透侵蚀能力最强,因为FeO与铬刚玉砖中的Al₂O₃和Cr₂O₃反应生成高熔点物,抑制炉渣的渗透和侵蚀。2)微孔刚玉-莫来石砖中镁铝尖晶石与钙铝黄长石的生成在侵蚀层形成保护层,阻止SRV渣的渗透侵蚀,在3种无铬材料中,表现出最优的抗侵蚀性。3)刚玉-莫来石砖中由于大量钙长石的形成产生的缝隙造成渣的不断渗入,使得熔渣对砖的侵蚀较严重。4)刚玉-尖晶石砖中原位生成粒径小、活性高的尖晶石晶粒,能有效吸收熔渣中的铁离子形成镁铝铁复合尖晶石,阻挡SRV渣的侵蚀。

关键词: HIsmelt工艺, 熔融还原炉, 铬刚玉砖, 微孔刚玉-莫来石砖, 刚玉-莫来石砖, 刚玉-尖晶石砖