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In recent years, the rapid development of China’s iron and steel industry has led to an increasing shortage of domestic iron ore resources. China currently imports more than 60% of its iron ore requirements (Xu and Shi, 2015). In order to reduce dependence on foreign iron ore resources, it is necessary to increase the development and utilization of existing iron ore resources in China. Oolitic haematite ore is widely distributed and available in China. The explored reserves of this type of iron ore reach 3720 Mt, which is approximately 11% of the total iron ore resources (Sun, Han, and Gao, 2014). Oolitic haematite ore has a unique structure, as shown in Figure 1, characterized by spherical grains composed of concentric layers. The iron oxides, fluorapatite, and chamosite (a hydrous aluminium silicate of iron) are intimately intermixed; moreover, microfine-grained haematite is disseminated with gangue minerals (Wu, Wen, and Cen, 2011). It is difficult to obtain high-grade iron concentrates with a low phosphorus content using conventional magnetic separation or froth flotation methods following fine grinding of oolitic haematite ores (Li et al., 2013; Nunes et al., 2012; Yu, Yu, and Xu, 2013). However, it is very important for the future of China’s steel industry to increase the exploitation and utilization of this kind of ore. Oolitic haematite ores vary widely in chemical composition. Oolitic haematite is one of the most refractory iron ores, and is characterized by low total iron content (30–55%, although the grade in individual places can reach more than 55%), and high phosphorus (0.4–1.8%) and alumina ( 2.5–9.0%) contents. After beneficiation, the ore grade is about 58%, the SiO2 content is above 9%, and the contents of Al2O3 and P are higher (0.4%–1.8% P and 2.5%–9.0% Al2O3, respectively). Increasing the concentrate grade to more than 64% Fe will not only incur a great increase in mineral processing costs, but the metal yield will also decrease. In this study in order to explore the possibility of utilizing oolitic haematite with a higher grade of iron, which has not been enriched by mineral processing, oolitic haematite ore was used as an addition in pellet production, and a preliminary study of the effect of various additions on the compressive strength of pellets was carried out, based on the changes in the porosity of the finished pellets and the oxidation-recrystallization of the pellets,. The results can provide a theoretical basis and technical guidance for the industrial development and utilization of this kind of iron ore.

Effects of oolitic haematite ore additions on the compressive strength of iron ore pellets