Our country uses magnesian calcium on finery is fireproof material only then at the beginning of 8O time. Magnesian calcic simple stuff is thermodynamic stability is good, fine effect beautiful, already regarded smelt as the lining of steel of class of high quality stage by stage. The character of CaO is as follows:
(1) CaO melting point is high (2570 ℃ ) , the vapour pressure below high temperature is low, linear expansion coefficient is smaller than MgO (℃ of CaO 12.6X LO-6 - 1, mgO14.1×10-6 ℃ - 1) , heatproof shake sex is good.
(Melting point of production of 2) chemistry reaction is high, of MgO and CaO in all melting point is high (2730 ℃ ) . CaO and slag constituent reaction generate 200. SiO2(melting point 2136 ℃ ) with melting point of 3CaO • SiO2(1900 ℃ ) photograph of high temperature mine, raised the viscosity of slag, those who deferred pair of fireproof material erode.
(3) falls in high temperature vacuum, caO has taller stability than MgO. In the quantity that contain carbon same condition falls, the performance characteristics that MgO-CaO-C pledges than MgO-C character rises about 15% .
(4)CaO big advantage can be adsorptive in molten steel [S 〕 , (〕 of O of P) , 〔 has the effect that purifies molten steel. This one character makes its make the ideal lining material of finery.
Exemple plant of 1 Beijing heavy-duty machine is on 5OtASEA-SKF finery, what some factory produces complete set use Tianjin is firing oily dip is magnesian dolomite brick, is its function MgOM% ? S0% , caOl5% ? 20% , bulk density 3. 10g/cm3, grind intensity of pressure is spent > 80MPa, normal temperature is fought tear open intensity 101MPa, the KBMC chromic magnesia brick that this brick used the effect to exceed Japan 1981 and the direct tie that home produces are magnesian chromic brick, life amounts to 17 furnace second it is the Gao Jilu since this factory put into production.
80MPa, normal temperature is fought tear open intensity 101MPa, the KBMC chromic magnesia brick that this brick used the effect to exceed Japan 1981 and the direct tie that home produces are magnesian chromic brick, life amounts to 17 furnace second it is the Gao Jilu since this factory put into production.
Exemple 2 1992 year, too the electric frit that steel closes hill to produce greatly is magnesian dolomite brick (IL4.86% , mgO62. 61% , caO30.11% , bulk density 2. 97g/cm3, compression intensity 80. 9MPa) is used at I8tAOD furnace, 9 furnace service is average furnace life 39. 4 furnace, tall furnace life achieves 45 furnace, with firing oily dip is magnesian dolomite brick life matchs.
Magnesian calcium fastens fireproof material, as smelt the addition of clean steel, need to enlarge applied limits further, and magnesian carbon mixes alkalescent and fireproof material and its carbonaceous character form of qualitative adventitious of magnesian calcic carbon is fireproof the development of material also is urgent affairs. Zhengzhou flourish fills fireproof material to regard manufacturer of the adventitious of high quality fireproof material as the home, have rich manufacturing experience and practice base, stand in the forward position that the industry expands from beginning to end, pay attention to innovation of science and technology, increase the development strength to new product ceaselessly, in ensuring flourish fills material to be able to apply to more furnace kiln projects, bring good news for more projects. Flourish fills network of fireproof material official: Http://www.glzcj.com
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