关键词: 锌铝尖晶石, 高纯镁砂, 方镁石-锌铝尖晶石砖, 铁铝尖晶石砖, 抗侵蚀性

Abstract: Periclase-zinc alumina spinel specimens were prepared using high-purity magnesia (5-0.074 and ≤0.074 mm) as the main raw material,replacing the high-purity magnesia with zinc alumina spinel particles (5-0.074 mm) and the fine powders (≤0.074 mm) synthesized by the sintering method.Effects of the zinc alumina spinel particles addition (10%,15% and 20%,by mass) or fine powder addition (5%,10% and 15%,by mass) on the properties of the specimens were studied.Their properties were compared with those of commercial hercynite bricks,respectively.The results show that:(1)with the increase of the zinc alumina spinel particles addition,the apparent porosity of the specimens increases,the bulk density and the cold crushing strength decrease,and the thermal shock resistance slightly improves;(2)with the increase of the zinc alumina spinel fine powder addition,the cold physical properties and the thermal shock resistance of the specimens increase;(3)when zinc alumina spinel is introduced as 10% particles or 5%-10% fine powder,the corrosion resistance of the specimens is better than that of the hercynite brick used in cement kiln at present.In summary,the specimens with 5% zinc alumina spinel fine powder have the best performance.

Key words: ZnAl₂O₄, high-purity magnesia, periclase-zinc alumina spinel brick, hercynite brick, corrosion resistance