Radiative parameters of steel slag for FeO content estimation using multispectral thermography system

Strąkowski, R.; Pacholski, K.; Więcek, B.; Olbrycht, R.; Wittchen, W.; Borecki, M.

doi:10.1080/17686733.2014.970754

Cited by 8 publications

(5 citation statements)

References 5 publications

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“…6) and can be pooled into one sample (the sample characteristics are given in Table 3). This can mean that the process developing in the specified intervals have common physical nature [11].…”

Section: Statistical Analysis Of Melt Stream Infrared Radiation Strenmentioning

confidence: 99%

“…6 Graphs of probability density functions of C i values (1-first slag carryover into the ladle; 2-before charging bulk materials into the ladle; 3-in the process of charging bulk materials into the ladle; 4-when the BOF tilt angle is 85°; 5-30 s before the moment of slag carryover into the ladle; 7-pooled sample) out an assessment of the upper boundary of the confidence limit for variances σ i 2 of the specified samples. Pearson statistics χ 2 (chi-square) [11] was used to carry out the assessment (Table 4). Confidence limits with the significance level of q = 0.01 for С i value were calculated using the following expression ( Table 5):…”

Section: Confidence Limits Of с I Value Space Calculationmentioning

confidence: 99%

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Survey of melt stream infrared radiation parameters at various stages of steel tapping from basic oxygen furnace

Lukyanov

Суспицын

Пишнограев

et al. 2016

Int J Adv Manuf Technol

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Current world economic recession and high competition in the market of ferrous metallurgy products make the issue of improving the efficiency of the steel-making process especially pressing. One of the ways to improve the efficiency of a steel-making unit is to provide the sufficient minimum content of furnace slag in a pouring ladle. It can be achieved by permanent real-time monitoring of the melt stream during tapping from the steel-making unit. The most efficient way to monitor the melt stream is the method based on control of infrared radiation from the steel being tapped. The article offers the analysis of arrays of infrared radiation values from operating steel-making units of the largest smelters of Russia. The authors give some practical design recommendations for monitoring systems of melt stream in the process of tapping from the steel-making unit. They also describe the rule of slag detection in the melt stream.

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Section: Statistical Analysis Of Melt Stream Infrared Radiation Strenmentioning

confidence: 99%

Section: Confidence Limits Of с I Value Space Calculationmentioning

confidence: 99%

Survey of melt stream infrared radiation parameters at various stages of steel tapping from basic oxygen furnace

Lukyanov

Суспицын

Пишнограев

et al. 2016

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…Specifically, among the factors that must be considered there are multiple chemical reactions, changes in the temperature, and the formation of gases and other intermediate species. In order to overcome these issues, many techniques have been proposed for characterizing and monitoring pyrometallurgical processes based on the measurement of optical properties such as the visible-near-infrared (VIS-NIR) spectral emissions [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 ]. On the one hand, in the iron and steel industry, several optical studies based on radiometry and spectral imaging have measured molten-phase temperature, the steel emissivity, and the slag absorption and reflection coefficients.…”

Section: Introductionmentioning

confidence: 99%

“…Based on these indicators, it has been possible to develop an optical technique for online slag detection and estimation of the melt depth and the slag layer thickness, which are key for the control and proper monitoring of the siderurgical processes. [ 17 , 18 , 19 , 20 , 21 ]. On the other hand, only few developments based on optical technology for control and monitoring of copper pyrometallurgical processes have been reported [ 10 , 11 , 12 , 13 , 14 , 15 , 22 ].…”

Section: Introductionmentioning

confidence: 99%

A Radiometric Technique for Monitoring the Desulfurization Process of Blister Copper

Vásquez

Pérez

Roa

et al. 2021

Sensors

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In this paper, a novel optical technique for following the progress of the blister copper desulfurization process is presented. The technique is based on the changes observed in the continuous spectrum of the visible–near-infrared (VIS–NIR) radiation that the blister melt emits while the chemical reactions of the sulfur elimination process are taking place. Specifically, the proposed technique uses an optical probe composed of an optical fiber, a collimating lens, and a quartz tube, which is immersed in the melt. This optical probe provides a field of view of the blowing zone where the desulfurization reaction occurs. The experimental results show that the melt VIS–NIR total irradiance evolves inversely to the SO2 concentration reported by a gas analyzer based on differential optical absorption spectroscopy. Furthermore, the blister copper spectral emissivity as well as the total emissivity observed throughout the process show strong correlation with the sulfur content during desulfurization reaction.

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“…In the investigation reported in [6] and [7], a CCD camera is used to capture images of the process and slag is manually segmented by selecting a region of interest, this being the main limitation for its implementation in production due to the speeds that the process demands. Other developments are based on the use of a camera for thermography, taking advantage of the emissivity of objects to segment and detect slag [8], however, research using this method focuses on temperature measurement [9], measurement of slag [10], estimation of radioactive parameters in slag [11] or the determination of slag properties.…”

Section: Introductionmentioning

confidence: 99%

Shape Retrieval Using Fourier Descriptors Applied to Industrial Process

Romero-González¹,

Romero-González²,

Herrera-Navarro³

et al. 2020

JCC

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Nowadays, manufacturing processes are carried out at speeds that they themselves demand and subject to rigorous standards to maintain the quality of materials. An important step to define the quality of products in metalworking is the casting process, which principal focus is seeking control and monitoring of properties of materials. Nevertheless, it is not easy due to the high temperatures and gas produced in the vessel. Although some researchers have been attempting to solve these problems, it is difficult to carry out due to hard conditions. This article proposes the analysis of the surface of the liquid metal, that is, the slag on the surface, which is considered as connected spaces characterized by the topology of their discrete surface. These spaces are described through Fast Fourier Transform, associating changes of intensities to the frequency domain and obtaining main features of these frequencies, these features are used to define an enveloping shape that represents the liquid metal. Finally, the results obtained are presented, which, according to them shows that it is possible to characterize the slag, and by which it is possible to spatially locate the molten metal liquid in the refractory. Therefore, this research serves as the basis for the development of new algorithms for level detection and measurement, preventing overflows and damage to refractories.

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Radiative parameters of steel slag for FeO content estimation using multispectral thermography system

Cited by 8 publications

References 5 publications

Survey of melt stream infrared radiation parameters at various stages of steel tapping from basic oxygen furnace

Survey of melt stream infrared radiation parameters at various stages of steel tapping from basic oxygen furnace

A Radiometric Technique for Monitoring the Desulfurization Process of Blister Copper

Shape Retrieval Using Fourier Descriptors Applied to Industrial Process

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