褐鉄鉱含有砒素の脱砒におよぼす配合鉱石中の脈石成分の影響 : 予備処理による褐鉄鉱含有砒素の脱砒に関する基礎的研究 III

概要

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Limonite, produced in Hokkaido, contains arsenic. As arsenic cannot be removed during the refining process in both blast furnaces and open hearth furnaces, must be removed during the ore beneficiation process. Limonite is normally sintered after mixing with foreign ores to remove arsenic. During the process the gangue in mixed ores are considered to have some effects on the arsenic removal. In the present investigation the gangue was divided in three groups : acidic (SiO_2, TiO_2), neutral (Al_2O_3) and basic compound (CaO, MgO), and the effect of these groups on the arsenic removal reaction was investigated. The following results were obtained : (1) Acidic compounds such as SiO_2 and TiO_2 had only a little hindering effect on arsenic removal. Especially the effect of SiO_2 at a high temperature of 1300℃ was very little. (2) Neutral compounds such as Al_2O_3 also had only a little hindering effect on arsenic removal. (3) Basic compounds such as CaO and MgO had a detrimental effect on arsenic removal and even the co-existence of small content of them decreased rapidly the arsenic removal ratio. The effect of MgO was rather little as compared with that of CaO especially at a high temperature of 1300℃. (4) The behavior of arsenic in Dungun iron ore was very similar to that in Hokkaido limonite.
社団法人日本鉄鋼協会の論文
1959-11-01