Effect of Aluminum Dissolved in Hematite on Formation of Calcium Ferrites at 1473 K HUI GUO and XING-MIN GUO Silico-ferrite of calcium and aluminum (SFCA) is a primary bonding phase, which determines the quality of high basicity sinter used widely as raw materials in blast furnace ironmaking. Calcium ferrite containing aluminum (CFA) is a key precursor during the formation process of SFCA and is inﬂuenced by Al O content in iron ore ﬁnes. In this work, the experiment was 2 3 conducted to investigate the eﬀect of the aluminum occurrence state on the formation of calcium ferrite by the simulating sintering process of diﬀerent types of aluminum-bearing hematite at 1473 K. X-ray diﬀraction, optical microscope, scanning electron microscopy, and energy-dispersive spectroscopy were used to characterize the mineral change in sintered samples. The result shows that the formation of CFA was promoted by both granular Al O 2 3 wrapped in Fe O and aluminum dissolved in Fe O solid solution, especially for the latter, due 2 3 2 3 to the formation of the CFA directly from the reaction between Fe O -Al O solid solution and 2 3 2 3 CaO, and the aluminum content in CFA formed
Metallurgical and Materials Transactions B – Springer Journals
Published: May 29, 2018
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