Refining of high-phosphorus manganese alloys, which are formed during electrometallurgical Dephosphoration of manganese ore

Abstract

Goal. Creation of the most rational way of dephosphorization of manganese alloys. Method. Thermodynamic calculations to establish the preference of the reactions during dephosphorization. Computer modeling of the influence of the charge composition on the process of reducing the phosphorus content. Experimental studies in the laboratory during a two-stage processing of high phosphorus metal. Results. The results of computer modeling and experimental study of the refining process of manganese alloy with high content of silicon and phosphorus indicate the feasibility of using the experimental slag-forming mixture based on Na4SiO4. Comparisons of the calculated data with the results of experimental melting show that there are differences in their values. These differences are due to the fact that in real conditions the thermo-dynamic forecast does not always coincide with the kinetics of the real process. The obtained experimental data indicate that the analyzed system achieves a state of dynamic equilibrium in contrast to the data of thermodynamic calculations by the program, which does not take into account the kinetics of the real process and the assumptions made in the simulation. Scientific novelty. The results of experimental studies have shown that the adopted physico-chemical features of the one-stage method of refining the alloy from silicon and phosphorus at a temperature of ~ 1350oC, provide protection of manganese from oxidation with the use of Na4SiO4. Practical significance. Therefore, it is advisable to implement the developed scheme of dephosphorization of the accompanying manganese alloy, which is formed during the production of low phosphorus slag, in industrial conditions. Given that the limiting link in the refining process is the oxidation reaction of the phosphorus alloy due to the interaction with Fe2O3, it is advisable to use forced mixing of the metal and the alloy by purging with neutral gas. Key words: phosphorus, manganese ore, concomitant manganese alloy, low phosphorus slag, dephosphorization,