Features of dust formation in the oxygen-blowing of melts and possible uses of captured dust

Simonyan, L. M.; Govorova, N. M.

doi:10.1007/s11015-011-9451-1

Cited by 8 publications

(4 citation statements)

References 1 publication

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“…10 Dust formation in a BOS converter has been studied by various researchers, and the dominant mechanisms are the ejection of fine metal and slag droplets caused by bursting CO bubbles of the film in the melt, vapourisation and spitting of material and entrainment of fines during top charging material additions. 5,[11][12][13][14] As expected, it is clear from the literature that there are many variables that affect the quantity of dust produced during a steelmaking heat. The dust mass profiles of heats vary significantly, as shown in the following examples, which are plotted as relative quantities of the maximum dust mass rate recorded for all the trial heats.…”

Section: Dust Formationmentioning

confidence: 59%

Correlation of BOS process variables with dust mass formation and zinc content

Steer

Griffiths

Heinrich

et al. 2013

Ironmaking & Steelmaking

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The basic oxygen steelmaking (BOS) process typically produces a dust rich in valuable iron units and often contaminated with zinc. This paper takes a look at statistical correlation and multiple regressions of process variables with the quantity of dust and the zinc mass contained in the dust. A robust inline sampling system was designed and installed to isokinetically sample the primary BOS dust slurry from a 248 m 3 capacity BOS converter at Tata Steelworks Port Talbot (UK). This system was used to measure the dust mass and composition changes against time for 12 large scale trial heats and to compare with the process information data for a statistical evaluation of the variables. Statistically significant Pearson linear correlations were measured for the total dust mass produced with the iron ore and for the zinc mass contained in the dust with the addition of waste oxide briquettes (WOBs). A multiple regression analysis model showed strong associated correlations between the zinc mass contained in the dust with the galvanised scrap and WOB additions and explained 73% of the zinc mass variance.

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Section: Dust Formationmentioning

confidence: 59%

Correlation of BOS process variables with dust mass formation and zinc content

Steer

Griffiths

Heinrich

et al. 2013

Ironmaking & Steelmaking

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“…In Table 1, it is possible to see the content of EAF dust and all the properties required to calculate the effective permittivity and permeability-ε is the real part of permittivity (relative dielectric constant), σ is the electric conductivity, µ is the real part of magnetic permeability, and µ" is the imaginary part of magnetic permeability. According to work [20], in the process of the blowing of iron-bearing melt with oxygen, dispersed particles in the flue gases have a layered composition, with Fe 2 O 3 on the surface and Fe 3 O 4 underneath it. Let us assume that zinc-containing particles have the same core-shell structure, with ZnFe 2 O 4 in the core and ZnO in the shell of particles.…”

Section: Effective Permittivity and Permeability Of Eaf Dustmentioning

confidence: 99%

“…In addition, in [1], it is observed that the dust had two main size fractions, namely a very fine-grained portion (0.1-1 µm) and a coarser portion (1-100 µm). According to this, let us consider that on average the radius of the ZnFe 2 O 4 core of the zinc-containing particles is 100 nm and the radius of the Fe 3 O 4 core of the iron-containing particles is 25 µm [3,4,20,22]. However, it can be seen that only the ratio of the thickness of the shell to the radius of the core is used in Equation ( 1), and the absolute values of radii of particles are given here only to estimate this ratio.…”

Section: Effective Permittivity and Permeability Of Eaf Dustmentioning

confidence: 99%

Optimization of the Microwave-Assisted Carbothermical Reduction Process for Metals from Electric Arc Furnace Dust with Biochar

Anzulevich

Butko

Калганов

et al. 2021

Metals

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The main purpose of this work was to extract valuable metals from EAF dust with the addition of biochar, using microwaves to control and optimize the carbothermical reduction process. To achieve better microwave penetration and the most homogeneous electromagnetic heat source distribution possible in a sample, the content of EAF dust and biochar in centimeter-size spherical particles prepared by the pelletization process was considered to be radially heterogeneous. The content of EAF dust was determined experimentally and the effective permittivity, permeability, and thermal conductivity of the EAF dust as well as biochar–EAF powder mixture were determined using effective medium approximation. The microwave heating of a multilayered pellet of biochar-containing EAF dust was simulated and investigated. The influence of the distribution of the components within the pellet on the effectiveness of the microwave heating was investigated, as was the influence of the biochar conductivity. The interaction of the pellet with both plane waves in free space and with H10 mode waves in a single-mode waveguide was considered. The most optimal distribution of EAF dust and biochar within the pellet for the reduction process was determined.

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“…17 Dust formation in a BOS converter has been studied by various researchers, and the dominant mechanisms are the ejection of fine metal and slag droplets caused by bursting CO bubbles in the melt, vaporisation and spitting of material, and entrainment of fines during top charging material additions. 5,15,[18][19][20] Figure 2 shows a 'typical' rate of dust extracted by the primary extraction system (g L 21 ) against time. These figures were normalised to the oxygen blow start at 0 min.…”

Section: Dust Formationmentioning

confidence: 99%

Characterisation of BOS steelmaking dust and techniques for reducing zinc contamination

Steer

Grainger

Griffiths

et al. 2013

Ironmaking & Steelmaking

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he basic oxygen steelmaking (BOS) process generates a significant amount of iron bearing dusts, and the recovery of these affects the economics and sustainabiiity of the process. However, zinc contamination of the dust restricts how much can be recovered through the process. An iniine sampling system was used to isokineticaiiy sample primary BOS dust from the slurry pipe of a 248 m^ capacity BOS converter at Tata Steelworks Port Talbot (UK). The process was benchmarked with low galvanised scrap trials and control trials before investigating a new inprocess zinc separation technique. This trial involved holding galvanised scrap in a hot converter purged with nitrogen, to volatilise the zinc from the primary dust system for capture in the secondary dust system, before the blow. Using this technique, the zinc contamination of the primary BOS dust was reduced by up to 52% of the initial zinc mass contained in the galvanised scrap charge.

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Features of dust formation in the oxygen-blowing of melts and possible uses of captured dust

Cited by 8 publications

References 1 publication

Correlation of BOS process variables with dust mass formation and zinc content

Correlation of BOS process variables with dust mass formation and zinc content

Optimization of the Microwave-Assisted Carbothermical Reduction Process for Metals from Electric Arc Furnace Dust with Biochar

Characterisation of BOS steelmaking dust and techniques for reducing zinc contamination

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