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含氟烧结矿粘结相基础特性的研究

Basic Characteristics of Binding Phase in Sintering Ore Containing Fluorine

【作者】 李光森

【导师】 沈峰满;

【作者基本信息】 东北大学 , 钢铁冶金, 2006, 硕士

【摘要】 含氟烧结矿中的枪晶石一直被认为是制约包钢烧结矿强度的主要因素,而且自熔性烧结矿是公认的强度较低的烧结矿,但是实践表明,接近自熔性的包钢第三代烧结矿(R=1.36)却基本保持了包钢第二代烧结矿(高碱度)的强度。 本文认为烧结矿的强度与烧结矿中粘结相的分布有很大关系,粘结相的分布又受其流动性的影响。用粘度和表面张力可以定量解释粘结相流动性与其组成间的关系。 根据包钢第三代烧结矿中粘结相的组成,用分析纯的化学试剂配制粘结相,考察了碱度(CaO/SiO2),MgO、CaF2和FeO四个因素对粘结相粘度和表面张力的影响。通过测量熔融粘结相的粘度、表面张力和对Fe3O4的润湿角,得到粘结相组成对基础特性的影响规律,从而为合理配料提供参考依据。 由于烧结过程的复杂性,需综合考虑各因素对烧结矿的影响,结果如下: (1)变碱度条件下,当碱度为1.40时,粘结相具有较低的粘度和熔化性温度,表面张力随碱度的增加而增大。但当碱度大于1.40时,熔融粘结相冷却过程由于生成大量的2CaO·SiO2,产生明显的粉化现象,所以烧结矿中粘结相的碱度应低于1.40。 (2)适当增加MgO含量,可降低粘结相的粘度,增加表面张力,当MgO为5%时,粘结相的熔化性温度最低,为1235℃。 (3)增加CaF2和FeO含量,将降低粘结相的粘度和表面张力,CaF2效果尤为明显。 (4)通过测定不同粘结相的熔点发现,碱度(CaO/SiO2)升高、MgO含量增加可使粘结相的熔点升高,粘结相对Fe3O4的润湿角增大;添加CaF2和FeO能降低粘结相的熔点,减小粘结相对Fe3O4的润湿角。 (5)试验研究表明:合理的硅酸盐粘结相为,碱度(CaO/SiO2)为1.18,MgO含量0.28%,CaF2含量4%,相应的烧结原料配比为,碱度(CaO/SiO2)为1.36,MgO含量2%,氟含量0.4%。

【Abstract】 The spar in sinter bearing fluorine is considered as one of the major factors effecting intensity of Baotou steel’s sinter. Self-fluxed sinter is always notarized with low intensity. But the Baotou steel’s practice indicates that the third generation sinter (R=1.36), close to self-fluxed sinter, keeps the intensity of the second generation high basicty sinter.This article studies the relationship between the intensity of sinter and the distribution of binding phase in sinter. The distribution is effected by the fluidity of molten binding phase. The fluidity can be quantitatively expounded by viscosity and surface tension.Based on the composition of binding phase in Baotou steel’s sinter, the binding phase is made up with analytic chemical reagent, CaO, SiO2, MgO, CaF2 and FeO. By measuring the viscosity, surface tension and wetting angle, the relationships between the basic characteristics and chemical composition of binding phase are obtained.By considering the facts effecting the intensity of sinter comprehensively, some results are obtained:(1) At the basicity of 1.4(CaO/SiO2), the viscosity is smaller and the melting temperature is lower, surface tension increases with increase of basicity. When the basicity surpasses 1.4, the molten binding phase will become pulverous while cooling for the phase transformation of

  • 【网络出版投稿人】 东北大学
  • 【网络出版年期】2006年 11期
  • 【分类号】TF046.4
  • 【被引频次】3
  • 【下载频次】311
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