Solid State Phenomena Vol. 226

Abstract: The article presents the strategic investments implemented in metallurgical enterprises in Poland in time of economical changes. After 1989 Polish steelwork plants started restructuring process connected with technological investments. Polish steelwork plants became a part of foreign capital groups or domestic capital groups. Privatised metallurgical enterprises after economic transformation gradually implemented new technology to their business activities. In the publication an overview of the definitions of strategic and development investments was conducted together with the presentation of the key investments which influence the sustainability of the business in the metallurgical enterprise on Polish market. As a case study was used ArcelorMittal Poland company. In 2004 international concern LNM (ArcelorMittal Poland today) bought the biggest Polish steelwork plants. Since that time the capital group invested 3 billion zlotys in new technology and modernization of the plants. Key strategic investment projects in the company were characterized in the paper.

Abstract: This paper is devoted to the comparison of theoretically defined solidus and liquidus temperatures based on above mentioned theoretical methods with the results of high-temperature thermal analysis carried out on two devices (Netzsch STA 449 F3 Jupiter; Setaram SETSYS 18_TM). On large samples (23 g), the method of direct thermal analysis was applied. On small samples (200 mg), the experiments using differential thermal analysis were realized. It was found out that the solidus and liquidus temperatures for the studied steel grade can vary in dependence on the used determination method. The used methodology of thermal analysis is fully reproducible, and the these thermo-analytical results can be considered as necessary for the correct setting of critical parameters in applied research on the process of steel casting.

Abstract: The paper presents an analysis of the possibilities of using the enthalpy of post-reaction gases from the ferrosilicon smelting process to produce electricity. Ferrosilicon smelting in the submerged arc furnace is one of the most energy-consuming electro thermal processes. Post-reaction gases, generated during the silica reduction process with carbon, contain significant amounts of energy. In the past the issue of energy recovery from the ferrosilicon process has been repeatedly taken, but for the Polish ferroalloy industry it is still valid. In order to determine the amount of energy possible for recovery calculations based on mass and energy balances has been carried out and determined the stream enthalpy of post processing gas. For preparing the balance sheets has been used operational data from the 20 MVA furnace and the overall reaction of the silica reduction process. It was assumed that the reduction process occurs at a temperature of 1650°C, and the temperature of leaving post-reaction gas, whose main ingredients are oxides CO and SiO, is 750°C.