Effect of MgO-component on Various Metallurgical Properties of Self-fluxed Pellets
1980 Volume 66 Issue 13 Pages 1840-1849
Details
1980 Volume 66 Issue 13 Pages 1840-1849
Effects of MgO component on metallurgical properties of fluxed pellets with 0.5, 1.5 and 2.0 of CaO/SiO2, 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°C1 100°C increases with the increase of MgO contents in pellets with 0.5 of CaO/SiO2, and with 1.52.0 of CaO/SiO2 indurated at 1200°C. However that of the latter pellet indurated at 1 2501 300°C does not change or decreases slightly.
(2) Swelling index of pellets with 0.5 of CaO/SiO2 shows higher values of 2045% at of MgO contents, and that of pellets with MgO 4% lowers to 1015%. The index of pellets with 1.5 of CaO/SiO2 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/SiO2 respectively, because magnesio-ferrite and/or MgO-c ontained 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 wastite powder of pellets.
