Аңдатпа
The proposed technology for processing of manganese-containing wastes from ore concentration represents a new approach to obtaining low-carbon ferromanganese from wastes. Based on the detailed comprehensive studies of two interrelated stages of the common technology (preparation of granulated pellets from a charge of preset composition and their consequent processing via low-temperature roasting), possibility of obtaining metallized granulated pellets is shown in this research. The main regularities of iron and manganese reduction during roasting within the temperature range 773–1800 K are established. Based on the comprehensive analytical studies of the material composition and forms of manganese, which were carried out using X-ray phase analysis, scanning electron microscopy and gas chromatography, step-by-step quality control of the products obtained during implementation of the technological cycle of low-temperature roasting is ensured. It was found out that beginning of abundant CO release in the gas phase under conditions of low-temperature roasting is achieved at a temperature ~1373 K. Temperature rise increases the CO content in the gas phase. Maximal CO content in the gas phase is 94 % CO, it was reached at the temperature of ~1473 K. It is displayed that increase of CO content in the gas phase is mainly determined by the course of reactions of wustite and magnetite reduction by carbon. Mn3O4 reduction reaction is hindered due to the high chemical strength of the oxide. It is indicated that higher roasting temperatures (~1773 K) are required to intensify reduction of strong manganese oxides (Mn3O4, MnO) by solid carbon. As a result of low-temperature roasting of granulated manganese pellets, metallized pellets with content of 23.67 % Fegen.; 23.2 % FeMe; 0.7 % MnMe; 28.47 % MnO; 5.0 % C etc. were obtained.The research was carried out within the range of grant financing by the Science committee of the Ministry of science and higher education of Kazakhstan Republic for 2023-2025, according to the priority direction “Geology, mining and processing of mineral and hydrocarbon raw materials, new materials, technologies, safe products and constructions”, the project АР19576391 “Development of the new technology for manufacture od new alloys from accumulated non-conditional multi-component chromium- and manganese-containing wastes with use of Big Data”.