自溶性ペレットの各種冶金性状におよぼす MgO 添加の影響(<特集>製銑)

概要

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Effects of MgO component on metallurgical properties of fluxed pellets with 0.5, 1.5 and 2.0 of CaO/SiO_2, were evaluated from a laboratory-scale reduction test, high temperature reduction test, and softening test under load with one pellet. The results are as follows : (1) Reduction degree at 900℃∿1100℃ increases with the increase of MgO contents in pellets with 0.5 of CaO/SiO_2, and with 1.5∿2.0 of CaO/SiO_2 indurated at 1200℃. However that of the latter pellet indurated at 1250∿1300℃ does not change or decreases slightly. (2) Swelling index of pellets with 0.5 of CaO/SiO_2 shows higher values of 20∿45% at 1∿2% of MgO contents, and that of pellets with MgO 4% lowers to 10∿15%. The index of pellets with 1.5 of CaO/SiO_2 decreases with the increase of MgO contents. (3) Softening properties during reduction test under load areimproved with the addition of MgO component, especially with more than 4% MgO than 2% MgO in case of 0.5 and 1.5 of CaO/SiO_2 respectively, because magnesio-ferrite and/or MgO-contained calcium ferrite phases with a better softening property are generated in pellets by adding MgO. High temperature properties are better in the pellets that showed higher forming temperatures of preliminary liquidus slag from DTA curves of wustite powder of pellets.
1980-11-01