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首页> 外文期刊>ISIJ international >Improvement of Sinter Softening Property and Reducibility by Controlling Chemical Compositions
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Improvement of Sinter Softening Property and Reducibility by Controlling Chemical Compositions

机译：通过控制化学成分改善烧结矿的软化性能和还原性

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摘要

Increasing permeability of packed materials in a blast furnace and decreasing reducing agent rate at a blast furnace process take an important role to improve productivity. In order to increase permeability and decrease reducing agent rate, sinter softening property during reduction and sinter reducibility are important. Effects of sinter compositions (CaO, SiO_2, Al_2O_3, MgO, FeO) on the sinter softening property during reduction and sinter reducibility were examined by samples produced from pot scale sintering. These compositions were controlled by lime stone, serpentine, and coke breeze content and varying iron ore source in raw sinter materials. And sinter softening property was estimated by vertical pressure drop of sinter packed bed (70 mmo x 100 mm) during sinter reduction with raising temperature to 1600℃ under vertical loading force (9.8 x 10~4 N/m~2). This pressure drop is caused by melt formation from slag compositions in sinter above 1000℃. And sinter reducibility was estimated as reduction degree by CO(30%)-N_2 gas under constant temperature conditions (900℃, 1100℃). Results were obtained as follows. (1) Low SiO_2 and low CaO sinter had superiority of sinter softening property. That is small pressure drop caused by decreasing SiO_2-CaO-FeO melt. (2) And low SiO_2 and low CaO sinter had high reducibility at both 900℃ and 1100℃. It is considered that decrease of these compositions affects restriction of calcium silicate containing ferrous oxides. (3) High MgO and high FeO sinter using dolomite instead of serpentine and blended with high coke breeze also had superiority of sinter softening property. Adding MgO to phase of CaO-FeO-SiO_2 raises melting temperature. The raising melting temperature is considered to make high pressure drop region to be narrow. (4) And high MgO and high FeO sinter had low reduction degree at 900℃ but kept high reduction degree at 1100℃. X-ray diffraction pattern for the sinter indicated that it contained much magnetite structure (magnetite and magnesioferrite) instead of hematite. This mineral composition is consistent with low reduction degree at 900℃. On the other hand, keeping high reduction degree at 1100℃ is considered to correspond not to promote silicate (FeO-2SiO_2, FeO-SiO_2-CaO) formation. By X-ray micro analyzer, it was found that calcium ferrite contained more Si and more Mg ion with increasing MgO in sinter. Increasing Si ion in calcium ferrite is considered to be the cause of restricting silicate formation. (5) Al_2O_3 content has little effect to sinter softening property. Summarized these results, low SiO_2, low CaO, high MgO and high FeO sinter has a good softening property and high reducibility. These characteristics indicate good performance as raw material in a blast furnace.
机译：提高高炉中填充材料的渗透性和降低高炉过程中还原剂的比例对提高生产率起着重要作用。为了增加渗透性并降低还原剂的比率，还原过程中的烧结软化性能和烧结还原性很重要。通过罐式烧结生产的样品，研究了烧结组成（CaO，SiO_2，Al_2O_3，MgO，FeO）对还原过程中烧结软化性能和烧结还原性的影响。这些成分受石灰石，蛇纹石和焦炭微风的含量以及烧结原料中铁矿石来源的变化控制。并通过在垂直加载力（9.8 x 10〜4 N / m〜2）下将烧结温度降低至1600℃时烧结烧结床的垂直压降（70 mmo x 100 mm）来评估烧结软化性能。该压降是由1000℃以上的烧结矿中炉渣成分形成的熔体形成的。并以CO（30％）-N_2气体在一定温度（900℃，1100℃）下的还原度来估算烧结矿的还原度。结果如下。 （1）低SiO_2和低CaO烧结矿具有优良的烧结软化性能。这是由于减少SiO_2-CaO-FeO熔体而引起的小压降。 （2）低SiO_2和低CaO烧结矿在900℃和1100℃均具有较高的还原性。认为这些组成的减少影响了含硅酸钙的氧化亚铁的限制。 （3）用白云石代替蛇纹石并掺入高焦微风的高MgO和高FeO烧结矿也具有优良的烧结软化性能。在CaO-FeO-SiO_2相中添加MgO会提高熔融温度。认为升高的熔融温度使高压降区域变窄。 （4）高MgO和高FeO烧结矿在900℃时还原度低，而在1100℃时还原度高。烧结矿的X射线衍射图表明，它含有许多磁铁矿结构（磁铁矿和菱铁矿）而不是赤铁矿。该矿物成分与900℃下的低还原度一致。另一方面，将高还原度保持在1100℃被认为不促进硅酸盐（FeO-2SiO_2，FeO-SiO_2-CaO）的形成。通过X射线显微分析仪发现，随着烧结中MgO的增加，铁氧体钙包含更多的Si和更多的Mg离子。铁酸钙中Si离子的增加被认为是限制硅酸盐形成的原因。 （5）Al_2O_3的含量对烧结软化性能影响很小。总结这些结果，低SiO_2，低CaO，高MgO和高FeO烧结体具有良好的软化性能和高还原性。这些特性表明在高炉中作为原料具有良好的性能。

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