冶金用スラグからの気化脱硫

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Gaseous desulphurization from molten synthetic CaO-SiO_2-Al_2O_3 slags some of which contain CaF_2 and iron oxides was examined under the gas atmosphere the oxygen content of which was 100, 30, 10 or 0.1%, the total pressure being 1.1 to 1.2 atm. The basicity of the slags was 1, 2 or 3, and sulphur was contained as sulphide, sulphate or both in the initial slags. Each of these slags weighing 2 to 12g was put in a platinum or alumina boat and heated to 1550℃ for 20 to 120min under the gas flow of ca. 2l/min. Initial desulphurization rate of sulphide sulphur was higher in a higher oxygen pressure of the atmosphere and about 80% of sulphur was removed in 10min under a pure oxygen atmosphere. Ferric iron accelerated the desulphurization of sulphide sulphur, and its effect was evident in the atmosphere of a low oxygen pressure. Desulphurization rate of sulphide sulphur showed the trend to be enhanced with the increase in basicity. The rate of desulphurization from sulphate bearing slag was high under the atmosphere of low oxygen pressure and was enhanced by the addition of ferrous iron. Chemical equations for the gaseous desulphurization were presented both for the acidic and basic slags separately. It was found that sulphide sulphur was gradually oxidized to sulphate under an oxidizing atmosphere. Fundamental knowledge was suggested for the effective gaseous desulphurization by the injection of oxygen, neutral or reducing gas into slags.
社団法人日本鉄鋼協会の論文
1983-04-01

冶金用スラグからの気化脱硫

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