赤鉄鉱の湿式造粒に関する研究

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The agglomeration of hematite from aqueous suspensions by use of coal tar as a bridging liquid has been studied. It is necessary to treat the hematite with a Na-oleate aqueous solution prior to the agglomeration in order to make the surface of the hematite hydrophobic. The application of this method to the formation of hematite pellets containing coal has also been investigated together with the test of the reducibility of these pellets. Main results obtained are summarized as follows. 1) Finely-divided hematite, which was pretreated with a Na-oleate solution, in aqueous suspensions can be agglomerated by applying suitable agitation in the presence of a small amount of coal tar. 2) When the surface of hematite particles is covered by the complete mono molecular film of oleate ions, the agglomeration efficiency becomes maximum. 3) With an increase of the amount of coal tar added, the agglomeration efficiency and the pellet size increase but the strength of green pellets becomes weaker ; the use of an excessive amount of coal tar results in no agglomerates formation. Thus, the amount of coal tar should be optimized. 4) The agglomeration efficiency, determined by the amount of coal tar added to the hematite in aqueous suspensions, is not influenced by the pulp density of suspensions. 5) The dry strength of the pellets rises up to 70kg/cm^2. 6) The agglomeration efficiency is improved and size of pellets becomes large (more spherical) by using coal together with coal tar. 7) When the hematite pellets containing 20% coal agglomerates are reduced with 10% coke, the degree of metallization of the pellets is about 90%.
社団法人日本鉄鋼協会の論文
1973-05-01

赤鉄鉱の湿式造粒に関する研究

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