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| THE IONIZATION THEORY OF DESULPHURIZATION WITH THE BLAST-FURNACE-TYPE SLAGS |
| WEI SHOU-KUN (Peking Institute oF Ferrous Metallurgy) |
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Cite this article:
WEI SHOU-KUN (Peking Institute oF Ferrous Metallurgy). THE IONIZATION THEORY OF DESULPHURIZATION WITH THE BLAST-FURNACE-TYPE SLAGS. Acta Metall Sin, 1966, 9(2): 127-141.
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Abstract In a previous paper, it has been ascertained by the same author, that the sulphurdistribution-ratio formula, based on the complete-ionization theory of slag constitution and with the introduction of activity coefficients,(％S)/[％S]=32L_sf_s/(γ_(Fe~(2+))+γ_(S~(2-))·(∑n+∑n-)/n_(FeO) is adaptable to different kinds of basic steel-making slags, and could explain unanimously the different controversial arguments as regards the effect of FeO upon desulphurization. It is the purpose of this paper to show that the same formula might equally well be applicable to the acid or less basic blast-furnace-type slags, and to try to work out a tentative method of calculation. With this view in mind, according to the "basicity index" (∑b-2n_(Al_2O_3))/(n_(SiO_2)-n_(Al_2O_3)) newly proposed, the following acid radicals have been assumed to be present in the blast-furnace-type slags: SiO_~(4-), Si_2O_7~(6-), Si_3O_9~(6-), Al_2SiO_7~(4-), Al_2Si_2O_8~(2-) and AlO_3~(3-). Elaboration of the experimental data of Hatch and Chipman, Taylor and Stobo, as well as and others gave the following empirical relation:logγ_(Fe~(2+))γ_(S~(2-))=-53.5 No~(2-)+2.12. With this relation and the above formula, evaluation of the sulphur-distribution-ratio of the basic cupola for the low-basicity practice gave values practically in good agreement with those found in practice. Further calculation has shown that the effects of the FeO-content of the less basic slag upon desulphurization follow the same regularity as those of the basic slags. Thus the above-given sulphur-distribution-ratio formula might be considered as a most general and universal formula, which holds true for the sulphur-distribution between molten iron with any carbon content, and slags with either low or high FeO-content, as well as slags with either high basicity for the steel-making slags or low basicity for the blast-furnace-type slags. Furthermore, the (%S)/αs value as calculated is found to be practically independent of temperature as well as the composition of the molten iron.
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Received: 18 February 1966
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[31] 参阅文献[1] .x |
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