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An investigation into aluminum occurrence impact on SFCA formation and sinter matrix strength
Journal of Materials Research and Technology ( IF 6.2 ) Pub Date : 2020-07-26 , DOI: 10.1016/j.jmrt.2020.07.032
Deqing Zhu , Yuxiao Xue , Jian Pan , Congcong Yang , Zhengqi Guo , Hongyu Tian , Dingzheng Wang , Yue Shi

The alumina content of iron ores for sintering is gradually increasing with the growing depletion of high-grade iron ores, which is harmful to the sintering process. Therefore, it is essential to reveal the action mechanism of alumina on sinter quality. In this paper, the aluminum occurrence of various iron ores was determined by applying X-ray diffraction (XRD), optical microscopy, scanning electron microscopy and energy dispersive spectrum analysis (SEM-EDS). Then, the effects of iron ore type, aluminum occurrence (free alumina, gibbsite, diaspore, alumogoethite and kaolinite) and alumina content on formation characteristics of SFCA bonding phases as well as sinter matrix strength were investigated based on laboratory compact sintering tests. The results show that the discrepancy of aluminum occurrence contributes to different SFCA formation characteristics and then sinter matrix strength, due to different reactivity of various aluminum-containing minerals with iron oxides and fluxes. Increasing alumina content generally results in an increase in the porosity of sinters and deterioration of sinter matrix strength for all aluminum occurrence. Aluminum in the form of kaolinite is more conducive to form dendritic or acicular SFCA with superior sinter matrix strength compared with other aluminum occurrences. In contrast, aluminum occurring in free alumina presents greatest adverse impacts on sinter matrix strength due to its poor reactivity and high porosity of resultant sinters.



中文翻译:

铝发生对SFCA形成和烧结基体强度影响的研究

随着高品位铁矿石的枯竭,用于烧结的铁矿石中的氧化铝含量逐渐增加,这对烧结过程有害。因此,揭示氧化铝对烧结矿质量的作用机理至关重要。在本文中,通过应用X射线衍射(XRD),光学显微镜,扫描电子显微镜和能谱分析(SEM-EDS)确定了各种铁矿石中铝的存在。然后,根据实验室密实烧结试验,研究了铁矿石类型,铝的存在(游离氧化铝,三水铝矾,辉绿岩,铝矾土和高岭石)和氧化铝含量对SFCA粘结相形成特性以及烧结基体强度的影响。结果表明,由于各种含铝矿物与氧化铁和助熔剂的不同反应性,铝的出现差异导致了不同的SFCA形成特性,进而导致了烧结基体强度。氧化铝含量的增加通常会导致所有铝发生时烧结体孔隙率的增加和烧结体强度的降低。与其他铝相比,高岭石形式的铝更有利于形成树枝状或针状SFCA,具有较高的烧结基体强度。相反,在游离氧化铝中存在的铝由于其不良的反应性和所得烧结体的高孔隙率而对烧结体基体强度表现出最大的不利影响。由于各种含铝矿物与氧化铁和助熔剂的反应性不同。氧化铝含量的增加通常会导致所有铝发生时烧结体孔隙率的增加和烧结体强度的降低。与其他铝相比,高岭石形式的铝更有利于形成树枝状或针状SFCA,具有较高的烧结基体强度。相反,游离氧化铝中存在的铝由于其不良的反应性和所得烧结体的高孔隙率而对烧结体基质强度产生最大的不利影响。由于各种含铝矿物与氧化铁和助熔剂的反应性不同。氧化铝含量的增加通常会导致所有铝发生时烧结体孔隙率的增加和烧结体强度的降低。与其他铝相比,高岭石形式的铝更有利于形成树枝状或针状SFCA,具有较高的烧结基体强度。相反,游离氧化铝中存在的铝由于其不良的反应性和所得烧结体的高孔隙率而对烧结体基质强度产生最大的不利影响。与其他铝相比,高岭石形式的铝更有利于形成树枝状或针状SFCA,具有较高的烧结基体强度。相反,在游离氧化铝中存在的铝由于其不良的反应性和所得烧结体的高孔隙率而对烧结体基体强度表现出最大的不利影响。与其他铝相比,高岭石形式的铝更有利于形成树枝状或针状SFCA,具有较高的烧结基体强度。相反,在游离氧化铝中存在的铝由于其不良的反应性和所得烧结体的高孔隙率而对烧结体基体强度表现出最大的不利影响。

更新日期:2020-07-26
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