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Industrial Ladle Furnace Slag Composition Analysis with Optical Emissions from the Arc
ISIJ International ( IF 1.8 ) Pub Date : 2020-09-25 , DOI: 10.2355/isijinternational.isijint-2019-676
Henri Pauna 1 , Matti Aula 1 , Jonas Seehausen 2 , Jens-Sebastian Klung 2 , Marko Huttula 3 , Timo Fabritius 1
Affiliation  

With the strict standards for steel quality and high production rates, the demand for faster and more convenient slag composition analysis for both electric arc and ladle furnaces has become a major issue in industrial steel plants. To overcome the time-delay between slag sampling and results of the slag composition analysis, an on-line slag composition analysis is required. Such a method that can be used in on-line analysis and is also chemically sensitive to the slag composition is optical emission spectroscopy. In this work, the optical emissions from the arc have been measured in an industrial ladle furnace and used for slag composition analysis. This article focuses on CaF2 and MgO, since the CaF2 is a common additive material in the ladle treatment and high MgO content means that the ladle refractory lining is dissolving into the slag. The analysis has been carried out by comparing emission line ratios to the XRF analyzed ratios of CaF2/MgO and MnO/MgO, respectively. The results show that several atomic emissions lines of calcium, magnesium, and manganese can be used to evaluate the CaF2/MgO and MnO/MgO ratios in the slag. It was found out that the plasma temperature derived from Ca I emission lines has a non-linear relation with the CaF2 content of the slag. Additionally, the dissociation pathways of molecular slag components were determined and studied in different plasma temperatures with equilibrium composition computation in order to determine the relations between the slag and plasma compositions.



中文翻译:

电弧光发射的工业钢包炉渣成分分析

有了严格的钢质量标准和高生产率,对电弧炉和钢包炉的更快,更方便的炉渣成分分析的需求已成为工业钢厂的主要问题。为了克服炉渣取样和炉渣成分分析结果之间的时间延迟,需要进行在线炉渣成分分析。可以用于在线分析并且对炉渣成分化学敏感的这种方法是光发射光谱法。在这项工作中,在工业钢包炉中测量了电弧的光发射,并将其用于炉渣成分分析。本文主要讨论CaF 2和MgO,因为CaF 2是钢包处理中常见的添加材料,MgO含量高意味着钢包耐火炉衬溶解在炉渣中。通过将发射线比率与CaF 2 / MgO和MnO / MgO的XRF分析比率分别进行比较来进行分析。结果表明,钙,镁和锰的几种原子发射谱线可用于评估炉渣中CaF 2 / MgO和MnO / MgO的比率。发现由Ca I发射线导出的等离子体温度与CaF 2具有非线性关系。炉渣的含量。此外,确定了分子渣成分的解离途径,并在不同的等离子体温度下进行了平衡组成计算,以确定渣与等离子体组成之间的关系。

更新日期:2020-09-25
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