Distribution of manganese and silicon between metal and slag in the processes of high-temperature processing of natural ores into ferrous metals
Akberdin A.A. Konurov U. Kim A.S. Orlov A.S.
2025Ore and Metals Publishing house
CIS Iron and Steel Review
2025#2950 - 55 pp.
Experimental studies have been carried out on the equilibrium distribution of manganese and silicon between pig iron, foundry cast iron, carbon ferromanganese and slags at the temperatures 1450, 1500, 1550 °С in a CO atmosphere. Using the found equilibrium concentrations of condensed phases, the distribution coefficients of manganese and silicon between the metal and the slag were calculated. It has been established that the distribution coefficient of manganese is significantly higher in experiments with ferromanganese than in experiments with cast iron, and the indicator for foundry cast iron is higher than that for pig iron. Relationships between the equilibrium distribution of the elements and the slag composition were established. To characterize the latter, optical basicity was used, which was determined through the electric negativity and electron density of the elements of the Periodic Table. The empirical equations that describe the dependence of distribution coefficients on the optical basicity of the slag were obtained by mathematical processing of experimental results. It turned out that this dependence is described by an equation with a high correlation coefficient (R = 0.93), and for manganese-with a low one (R = 0.65) for the case of silicon reduction. Analysis of the influencing factors revealed the need to take into account the influence of silicon in the latter case. The equation obtained in this case describes the dependence of the distribution coefficient with a correlation coefficient R = 0.98. This means that it is necessary to take into account the occurrence of the exchange reaction 2(MnO) + [Si] = SiO2 + 2[Mn], which is a combination of the other two reactions of manganese (MnO) + C = [Mn] + CO and silicon (SiO2) + 2C = [Si] + 2CO, during the carbothermal processing of ores containing manganese and silicon oxides, in addition to the two above-mentioned reactions. The practical result of the work is the possibility of assessing the distribution of manganese and silicon for slags of any composition due to the use of the optical basicity indicator, calculated from the electric negativity and electron density known for all elements.
carbothermal processing , equilibrium distribution , foundry cast iron , manganese , metal , pig iron , silicon , slag
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Bor laboratory, Chemical and Metallurgical Institute named after Zh. Abishev, Karaganda, Kazakhstan
Bor laboratory
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