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In situ Phase Analysis during Self-sintering of BOS Filter Cake for Improved Recycling
ISIJ International ( IF 1.8 ) Pub Date : 2020-08-29 , DOI: 10.2355/isijinternational.isijint-2020-142
Raymond James Longbottom 1 , Brian Joseph Monaghan 1 , David John Pinson 2 , Nathan Alan Stewart Webster 3 , Sheng Jason Chew 2
Affiliation  

The self-sintering of basic oxygen steelmaking (BOS) filter cake has been studied using in situ high temperature X-ray diffraction (XRD) during heating in air from room temperature to 1273 K. The aim of the study was to improve the understanding of the self-sintering process, using this in situ method to identify what reactions occur at different temperature ranges.

The in situ phase analysis measurements correspond well, and are consistent with, the previously reported characteristics of BOS filter cake oxidation. However, the in situ measurements have allowed a more detailed analysis of the reactions taking place over the temperature ranges studied. Wüstite was the first component of the BOS filter cake to react with air, reacting at temperatures of approximately 373 K to 773 K to form a magnetite-zinc ferrite spinel solid solution. The reaction of metallic iron began at higher temperatures than wüstite, beginning at ~633 K and finishing at ~873 K. The decomposition of fluxes (mainly CaCO3) occurred at temperatures above 873 K. At temperatures higher still, at approximately 1073 K, hematite reacted with zinc oxide to form zinc ferrite.

The knowledge that wüstite reacts at the lowest temperatures is an improvement in the understanding of the self-sintering of BOS filter cake, and may give insights into the initiation of the self-sintering process. This improved understanding will aid analysis and approaches focused on process optimisation to increase the amount of filter cake that can be recycled back to the BOS.



中文翻译:

BOS滤饼自烧结过程中的原位相分析,以提高回收率

在空气中从室温加热到1273 K的过程中,使用原位高温X射线衍射(XRD)研究了碱性氧气炼钢(BOS)滤饼的自烧结。该研究的目的是增进对碳氧炼钢(BOS)滤饼的自烧结。自烧结过程中,使用这种原位方法确定在不同温度范围内发生的反应。

原位相分析测量对应好,并且具有一致的,BOS滤饼氧化的先前报道的特性。然而,原位测量已经允许在所研究的温度范围内对反应进行更详细的分析。Wüstite是BOS滤饼中与空气反应的第一个成分,在大约373 K至773 K的温度下反应形成磁铁矿-锌铁氧体尖晶石固溶体。金属铁的反应开始于比钨铁矿更高的温度,约633 K开始,约873 K结束。通量的分解(主要为CaCO 3)发生在873 K以上的温度下。在更高的温度下(约1073 K),赤铁矿与氧化锌反应形成铁酸锌。

维氏体在最低温度下反应的知识是对BOS滤饼自烧结的理解的一种改进,并且可以为自烧结过程的启动提供一些见识。更好的理解将有助于专注于过程优化的分析和方法,以增加可循环回BOS的滤饼数量。

更新日期:2020-09-12
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