This work is dedicated to improving the smelting technology for refined ferromanganese grades through the use of a special complex reducing agent. Laboratory scale experiments were carried out on the smelting of refined ferromanganese using a briquetted charge. Fine fractions (0–5mm) were used for briquetting manganese ore and alumosilicomanganese alloy (AlSiMn). During the experiment were used laboratory installation “HYDROPRESS 50” and coreless induction furnace IUP-25. At the temperature of 1350∘C, the beginning of the charge melting was noted, and at the temperature of 1450∘C, the formation of a liquid melt. According to the chemical analysis, metal samples fully comply with the requirements of the standard. The progress of process parameters has been achieved: the rate of manganese extraction from ore is 70% (according to the traditional technology, it is 55%); slag/metal ratio is 1.8–2.0 (according to the traditional technology, it is 2.2–2.5); known values of slag basicity are 1.5–1.6. Laboratory melting slags were obtained in a stony state with no signs of breaking. As the outcome of this work, a high efficiency of using the reducing agents based on silicon and aluminum in refined ferromanganese smelting, as well as the use of primary manganese ores from Ushkatyn III deposit for smelting refined ferromanganese, allow reducing the lime consumption up to 40% due to the high content of calcium oxide in ore.
Keywords: refined ferromanganese, alumosilicomanganese alloy, manganese ore, briquette, slag