Rational application of high quality manganese concentrate

The article presents the results of theoretical and experimental studies of manganese reduction processes from oxides of high-quality manganese concentrate obtained by hydrometallurgical enrichment of ferromanganese ores, as well as, from marokite (product of thermal synthesis of concentrate and dolomite) with carbon and silicon. The method of thermodynamic modeling with TERRA software complex determined the optimal temperatures and costs of reducing agents that ensure the complete reduction of manganese. It was found that any of the above-mentioned reducing agents, or a combination thereof in certain ratios, can be utilized as a reducing agent when using oxide manganese-containing materials for steel treatment. The results of experimental studies made it possible to develop technology for the production of marokite-manganite concentrate and monophase synthetic material (CaMnO 3 ). They can be obtained using the technology developed by the authors, which includes mechanical and thermal treatment of a mixture of high-quality manganese concentrate and calcined dolomite or lime. Marokite-manganite concentrate is useful for alloying steel with manganese when it is smelted in an electric furnace or in a ladle furnace unit, and a monophasic synthetic material is efficient for the production of metal manganese. Based on the results of thermodynamic calculations and experimental studies, technological parameters for processing steel with marokite-manganite concentrate in an electric furnace and a ladle furnace unit are proposed. Monophasic synthetic material CaMnO 3 should be used as the charge component for the production of metal manganese by the out-of-furnace aluminum thermal treatment, which will increase the terminality of the process, as well as the extraction of manganese at the level of 90 %. The results of experimental studies were obtained using modern research methods with laboratory and analytical equipment, as well as statistical processing methods.