海水処理粉鉱ペレットの還元ふくれについて

概要

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The role of sodium-containing phase in the swelling during reduction of pellet was investigated. About 0.15% sodium in chloride form was retained in magnetic concentrated ore treated with sea water. In firing process, a part of sodium in the pellet produced from such concentrated ore was transferred into iron oxide and slag phases. The amount of sodium in iron oxide phase was evaluated by the extraction with HCl solution (1 : 1) at 90℃. Sodium in slage phase was determined by the ordinary hydrofluoric acid method after the removal of sodium embeded in the iron oxcide. The distribution of sodium in both phases was affected by the firing temperature and the slag volume in the pellet. Moreover, increase of the slag basicity brought about the decrease of the sodium content in the slag. The swelling index of the pellet was very small in the case that the amount of sodium in the iron oxcide phase was less than 0.005%. However, that of pellet with the sodium content more than 0.03% was over 300%. In order to prevent the abnormal swelling, sodium in the pellet should be absorbed by the slag generated in firing process.
社団法人日本鉄鋼協会の論文
1972-07-01