摘要:
在生产熔剂性烧结矿过程中,铁酸钙作为低熔点化合物,它的出现构成了液相形成的起点,铁矿石烧结过程中铁酸钙直接作为反应物参与烧结矿中复合铁酸钙的形成,其生成量的多少和分布影响着烧结矿的矿相结构,采用XRD和SEM等现代分析测试技术,研究了Al2O3对铁酸钙生成机理影响,850900℃时,Al2O3与铁酸二钙(C2F)发生反应生成铝酸半钙(CA2)和铁酸一钙(CF),随着温度的升高,当温度超过900℃时,铁酸二钙开始反应生成铁酸一钙,当矿相配比中Al2O3的含量较低时,固态下Al2O3颗粒几乎与C2F完全反应生成CA2,并且矿相中仍有部分C2F剩余,最终一起参与反应形成复合铁酸钙。
关键词:
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烧结 /
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铁矿粉 /
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铁酸钙 /
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铝酸半钙 /
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三氧化二铝
Abstract:
In the production of fluxed sinter,calcium ferrite as a low melting point compound which appears to be the starting point of liquid phase formation.During the sintering of iron ore the calcium ferrite acts as a reactant to form complex calcium ferrite in sinter,its amount and distribution affect the ore phase structure of sinter.In this paper,the influence of Al2O3 on the formation mechanism of calcium ferrite was studied by means of modern analysis and testing techniques,such as XRD and SEM.At temperature of 850 ~900 ℃,Al2O3 reacting with dicalcium ferrite（C2F） forms calcium CA2 and Calcium ferrite（CF）.When the temperature exceeds the 900 ℃,dicalcium ferrite starts reaction into ferrite calcium. When Al2O3 is lower in mixed ore,Al2O3 particles react almost completely with C2F to form CA2,at the same time some C2F remained in the ore phase takes part into the reaction and eventually form the complex calcium ferrite.
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