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Manganese is widely used in steel, chemical, non-ferrous metallurgy, batteries and other fields. Most of the manganese oxide ore in China are lean ore with high iron and low manganese, and most of them need beneficiation pretreatment before smelting. Commonly used processes include blast furnace smelting method, reduction roasting-leaching method, and direct reduction-leaching method. Among them, the reduction roasting-leaching process can realize the selective separation of iron and manganese minerals, and the comprehensive resource utilization rate is high, but the energy consumption of the roasting process is large. The thermodynamic conditions and kinetics of the simultaneous reduction of iron and manganese minerals must be studied, and the interaction between the magnetization reduction of iron oxide minerals and the pre-reduction of manganese oxide and the law of simultaneous reduction, the phase transformation and crystal form transformation of manganese oxide and iron oxide ore must be clarified, the mineral composition and bonding method of the bond during the reduction process. Provide a theoretical basis for realizing the low-temperature reduction of iron minerals and manganese minerals and saving energy consumption.

In this study, the effects of various characteristics of artificial and natural magnetite concentrates on their pelletizing behaviors were elucidated through batch pelletizing experiments. The results showed that artificial magnetite concentrates exhibit higher hydrophilicity and lower electronegativity compared with natural magnetite concentrates. Additionally, scanning electron microscopy of magnetite particles demonstrated that the surface of artificial magnetite particles was rougher than that of natural magnetite particles, which causes the artificial magnetite to have a larger specific surface area compared with natural magnetite. Pelletizing experiments indicated that the compressive strength of artificial magnetite green pellets was higher than that of natural magnetite green pellets. However, the shock temperature of artificial magnetite green pellet was only 255°C, which is far lower than the requirements of industrial production. It was found that when the pelletizing raw materials were mixed to consist of 20% artificial magnetite and 80% natural magnetite, the ballability increased significantly. [ABSTRACT FROM AUTHOR]