Abstract
The materials’ properties in the hearth of the blast furnace are very crucial for the hearth conditions. In this study, a number of coke, slag, metal, and aggregate samples were collected from the hearth of the LKAB’s experimental blast furnace (EBF). Subsequently, the coke, slag, and metal samples were chemically analyzed by X-ray fluorescence (XRF) or optical emission spectrometer (OES); the aggregate samples were analyzed by scanning electron microscope combined with energy-dispersive X-ray spectroscopy (SEM/EDS). The possible flow field of the liquid in the EBF hearth before quenching is depicted according to Cu tracers in the metal samples. Selected elements in the coke, slag, and metal were mapped for two sampling layers in the hearth, as well as in one cross section of the flow field. The results indicate that there exists an area beneath, and in front of, tuyere 3, where the flow resistance of the liquid was high. The high flow resistance contributed to the formation of a cold zone in the close-to-wall region and at the bottom of the EBF hearth. The temperature distribution in the EBF hearth has significant impacts on the chemical properties of the materials in different positions of the EBF hearth, as well as on the radial and vertical distributions of certain elements/components.
Highlights
The hearth of the blast furnace (BF) has been a research topic in a large number of studies, as the hearth conditions, among others, determines the liquid drainage, the energy consumption, the hot metal quality, the hot metal productivity and the wear of the refractory linings [1,2,3,4,5]
In the coke collected from the7.1 hearth the experimental blast furnace (EBF), the chemical compositions vary of the coke is
The ash contents in the shows vertical and radial variations, as in general, the ash contents are higher in the coke samples coke shows vertical and radial variations, as in general, the ash contents are higher in the coke collected from the second core-drilling layer than those from the first core-drilling, and higher in the samples collected from the second core‐drilling layer than those from the first core‐drilling, and coke samples collected from the close-to-wall region than those from the center
Summary
The hearth of the blast furnace (BF) has been a research topic in a large number of studies, as the hearth conditions, among others, determines the liquid drainage, the energy consumption, the hot metal quality, the hot metal productivity and the wear of the refractory linings [1,2,3,4,5]. Heat transfer, and materials transfer take place, due to the flow of the hot liquids and the chemical interactions among the hearth materials. These transfers could lead to various material phenomena in the hearth of the BF, such as carburization of hot metal, recirculation of the alkali in the hearth [6], reduction of FeO in the slag [7], radial/vertical variations of slag basicity, and certain elements in the hearth of the BF [8]. The materials phenomena, such as the molten slag/hot metal compositions, the void fraction, and the size of the coke bed, can influence liquid flow, and influence heat and material transfers
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