Kuzmenko S. Development of rational technological parameters of ferroussiliconmanganese production by improving the electric melting mode

Thesis is devoted to physical, chemical and electrical patterns of the process of joint recovery of manganese and silicon carbon at getting Ferroussiliconmanganese in ferroalloy furnaces in order to develop a rational technological scheme of production through the harmonization of process parameters and electrical characteristics of the process, providing the increase of technical and economic indicators. For the first time, it was developed a method for correction the errors of measured instantaneous voltage on the electrode with taking into account the influence of the instantane-ous current values of the neighbor phases for sixelectrode orethermic electric furnace, type RPG-63, in the ferroussiliconmanganese smelting. It is first developed method for determination of the electrical characteristics of the near electrode zones of the orethermic furnace field, which is based on mathematical processing of the instantaneous values of the current curves flowing through the electrode and the voltage drop across the sector "electrode - conductive hearth" using the methods of harmonic and differential analysis. This method formed the basis for automatic control system for orethermic furnace electrical regime, implemented at the Nikopol Ferroalloy Plant. Firstly dependency between the inductance and length of currentcarrying part of the electrode immersed in an oven, and the coefficients of the equation were experimentally identified. As a result of regression analysis, multiple regression equations of connections among the main technical and economic indicators with integral electrical characteristics, such as current and resistance of the electrode, were obtained. First the linear regression equation, ie the resistance band electrode space of the melt and the arc-shunt dependencies from the main technological relations of specific consumption of carbon, basic of the charge and slag, were obtained. The optimum values are: resistance bands electrode space of the melt and the arc-shunt, and technological relations, which they depend on. It was established that the deviation of resistance bands electrode space of the melt, the arc-shunt from the optimal value, indicates the violation of the process. Character of the deviation to determine parameters to be adjusted for recovery of the process in order to reduce electricity consumption, improve the extraction of manganese and furnace productivity. Obtained during the research process dependencies and the optimal values of technological parameters and electrical characteristics are used for the introduction of automatic control system for furnace electric mode (ACSFEM), that have allowed us to gain an annual economic profit amounting to 427,913 UAH.