Partition characteristics of radionuclides during a melt decontamination of a contaminated metal waste

Min, Byeong-Yeon; Choi, Wang-Kyu; Oh, Won Zin; Jung, Chong‐Hun; Lee, Kune-Woo

doi:10.1016/j.jiec.2008.08.015

Cited by 7 publications

(3 citation statements)

References 3 publications

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“…Table 2 shows results of radionuclides determination in steel round steel blooms samples. As it was expected regarding partitioning factors for steel in previous research [21,25,32,[35][36][37][38][39][40][41][42], the steel samples contain artificial radionuclides 60 Co, 137 Cs and 192 Ir as well as natural isotopes 40 K, 226 Ra, 232 Th, and 238 U in concentrations under lower level of determination.…”

Section: Resultssupporting

confidence: 54%

“…During steel making process, the radionuclides present in steel scrap distribute among these to other surrounding media. The results of earlier studies point to the distribution of radionuclide during the process of melting steel scrap, i.e., production of steel by EAF procedure [32][33][34][35][36][37][38][39], during which 60 Co, 63 gas production industry, is mainly transferred to slag and dust, less than 1% of these radionuclides remain in the melt [39]. When steel scrap is charged to an EAF, chemical agents (fluxes) and ferroalloys are added to adjust the chemical compositions of the molten steel.…”

Section: Resultsmentioning

confidence: 99%

“…The interactions among the flux, the refractories which lines the furnace and/or ladle, and the molten steel affect the final composition of the steel and hence the distribution of radionuclides among the melt, the slag, and the dust and it is necessary to determine how that contaminant is distributed in the various media, the melt, the slag, and the dust, following the melting of the steel scrap. The partition mechanism and mode of removal radionuclide from scrap to steel, slag and dust is a complex process that can be influenced by numerous chemical and physical factors, including the composition, thermodynamic conditions, solubility of radionuclides in molten steel, melting temperature, and melting practices such as the furnace type and size, melting time and the method of a carbon adjustment, and the physical and chemical properties of radionuclides [35]. Because of partitioning of radionuclides and distribution of mass in the various medium (steel, slag and dust), the concentrations of some radionuclides can be much higher in one of medium than the original concentrations in the steel scrap and/or total furnace charge.…”

Section: Resultsmentioning

confidence: 99%

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Monitoring of radionuclides in carbon steel blooms produced by EAF process

Sofilić

Barišić

Sofilić³

et al. 2011

J min metall B Metall

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Because natural and artificial isotopes in steel might originate from steel scrap or from the residue of the material that was used in the technological process, thus monitoring especially artificial radionuclides 60Co, 137Cs and 192Ir deserve special attention. The analysis by g-spectrometry has been applied to determine the presence of natural isotopes 40K, 226Ra, 232Th and 238U as well as of the artificial isotope 60Co, 137Cs and 192Ir and their activity in the produced steel round blooms in the Steel Mill of CMC Sisak d.o.o. At the same time the content of radionuclides in the other materials (ferroalloys, bauxite, fluorite, lime, coke, graphite electrodes, refractory blocks) used in the same steel making process was investigated. The measured values regarding the presence of individual isotopes and their activity in steel were as follows: 40K all values were less than 1.6 Bqkg-1; 232Th all activities values were less than 0.02 Bqkg-1; 226Ra all activities values were less than 0.01 Bqkg-1; 238U all activities values were less than 1.10 Bqkg-1; 60Co all activities values were less than 0.02 Bqkg-1; 192Ir all activities values were less than 0.02 Bqkg-1 and 137Cs all activities values were less than 0.30 Bqkg-1

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