Research On Improving Property Of MgO-MgO·Al₂O₃ Bricks Adhibited By The Cement Kiln Coating

In recent years, with the development of cement kiln technology and the consciousness strength of environmental protection of people, the magnesite-chromite bricks used in burning strip are replaced by basic bricks without chrome in recreasing. But because the capability, and the issue of price, there are many troubles in becoming the basic bricks used in cement kiln without chrome. In this paper, two kinds of additives which respectively include ZrO₂ and Fe₂O₃ were added in bricks, acrossing to inspect the property of MgO-MgO ? Al₂O₃ brick .especially on the property of adhibiting cement, it shows that:1 .The MgO-MgO ? Al₂O₃ brick can't adhibit cement when add Y₂O₃-ZrO₂, nano matreial, or MgO-CaO-Fe₂O₃ separately;2.When add 2.3% desilicate zirconia or 7% ZrO₂+Fe₂O₃ or 9% FeAl₂O₄ in MgO-MgO ? Al₂O₃ brick, it can adhibits cement fastnessly, their refractoriness under load can satisfy the using codition;3.The physical property of MgO-MgO ? Al₂O₃ bricks which include desilicate zirconia is worse than the bricks which include FeAl₂O₄. But the synthesis technics of FeAl₂O₄ is difficult, FeAl₂O₄ can also introduce Fe₂O₃ which sensitive to atmosphere. So if the MgO-MgO ? Al₂O₃ brick's physical property can improve, the additive of desilicate zirconia is best.