Calculation-Experimental Method of Manganese Losses Control in High-Carbon Ferromanganese Slag

Three tasks have been consistently solved in this paper. A thermodynamic analysis of the high-carbon ferromanganese smelting was carried out. The associated solutions theory was used to describe a thermodynamic activity of components in the metal and slag. Comparison of the calculated and technological data shows that the melting ends in conditions close to chemical equilibrium. The mineral phases in the slag, the relative amount and chemical composition of the phases are determined by X-ray diffraction analysis and X-ray spectral microanalysis. The method of converting the phase volume fraction to phase mass fraction (without using weight density) was suggested. It is established that there is no unambiguous relationship between the total content of MnO by chemical analysis and the MnO content in slag oxide phases. Also, there is no correspondence between the total content of MnO by chemical analysis and the amount of ferromanganese inclusions in the slag. A calculation-experimental method for description of manganese losses in the slag has been created. Correlation equations allow calculating the manganese distribution between the ferromanganese inclusions and slag phases by chemical analysis data only, without microscopic analysis of the structure.