Abstract
The sintering process is a thermal agglomeration process, and it is accompanied by chemical reactions. In this process, a mixture of iron ore fines, flux, and coal particles is heated to about 1300 °C–1480 °C in a sinter bed. The strength and reducibility properties of iron ore sinter are obtained by liquid phase sintering. The silico-ferrite of calcium and aluminum (SFCA) is the main bonding phase found in modern iron ore sinters. Since the physicochemical and crystallographic properties of the SFCA are affected by the chemical composition and mineral phases of iron ores, a crystallographic understanding of iron ores and sintered ore is important to enhance the quality of iron ore sinter. Scrap and by-products from steel mills are expected to be used in the iron ore sintering process as recyclable resources, and in such a case, the crystallographic properties of iron ore sinter will be affected using these materials. The objective of this paper is to present a short review on research related to mineral phases and structural properties of iron ore and sintered ore.
Highlights
A crystallographic understanding of iron ores and sintered ore is necessary to produce qualified iron ore sinter
In most Asian countries, iron ore sinters used in ironmaking are produced by mixing iron ores originating from different deposits around the world, such as those in Australia, Brazil, China, and India [1]
The strength of the iron ore sinter is obtained by calcium ferrite liquid phase sintering
Summary
A crystallographic understanding of iron ores and sintered ore is necessary to produce qualified iron ore sinter. As demand for the recycling of metallic resources is increasing, the utilization of steel scrap as well as by-products of steel mills is increasing [7,8,9,10,11,12] Against this scenario, crystallographic studies of iron ore sinter containing recycled metallic materials have acquired increased relevance. The Rietveld analysis method would be the most reasonable method for quantitative phase analysis (QPA) and obtaining crystal structure information since image analysis methods are based on limited 2D information. The types of phases and structural characteristics of sintered ore were investigated, and they are systematically reviewed here
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