Desulphurization of Ferronickel in the converters with oxygen is the most complex part of the technological process in the Drenas foundry. Sulphur in the ferronickel melting is mostly in the form of FeS, with a melting temperature of 1195oC, and it has tendency to dissolve indefinitely in liquid iron. Our objective is to determine the sulphur removal coefficient, as a key indicator of the desulphurization efficiency in the converter, by measuring the activity and concentration of sulphur and other elements in liquid Fe and melting. Determination of this coefficient is done according to the analytical method, while comparing the current process parameters with those of the new desulfurization methods, other indicators of the refining process are determined. The refining process and the effective conduct of the study depend on the XRD analysis database of metal and slag, and as well of the technological refining process analysis data. Research has shown that desulfurization efficiency is a function of the sulphur removal coefficient, respectively; metal composition, slag, oxygen activity, CaO/SiO2 ratio, sulphide capacity, fluidity, surface pressure, etc.). In addition to this coefficient, other indicators of refining process optimization are defined.

Purpose. The purpose of the research is to substantiate the possibility of replacing existing MgO bricks with the MgO-C bricks due to their resistance to the slag aggressiveness of the electric furnace and the Si content in the resulting metal, which can have a positive effect on reducing the consumption of refractory materials. Methods. This research will be presented as the results of theoretical and experimental data determining the dependence of the electric furnace on the type of refractory material, walls construction, operating parameters and the electric furnace lining, that are expected to have a major impact on the cost output of production process. Findings. Based on the presented results, it has been revealed that MgO-C bricks are more effective in terms of preventing the furnace damage depending on refractory materials. Therefore, to optimize the production process, it is recommended to improve the composition of melted metal and slag, as well as to strengthen the control of the process parameters. Originality. Laboratory analyses are conducted in specialized laboratories, and the presented data have been obtained through the use of devices and equipment required for experimental research. Practical implications. The refractory materials are one of the main indicators of technical performance and production costs at NewCo Ferronickel in Kosovo. Therefore, the higher performance of the refractory lining will have a positive effect on the furnace durability and the quality of the final product.

In this paper, we will calculate the load content in the process of rotary kilns, the thermal quantity of the content of calcine components in rotary kilns during the frying process, electricity consumption -melting of calcine on electric furnace I, for ton calcine of ferronickel in Drenas.The nickel ore is frying in a rotary kiln where a partial reduction of iron-nickel is achieved.Fuels used as an energy source in the process of rotary kilns: ➢ Kosovo lignite, ➢ Coal from Indonesia, ➢ Coal from Russia, ➢ Coal from Montenegro ➢ Fuel oil and pet-coke During the industrial research at the Ferronikeli Plant in Drenas, we have ascertained that the maximum calcine temperature at the outlet of the rotary kilns is 700 ° C, during the analysis of the work.Insufficient processing of iron-nickel ore for rotary kilns causes major problems in not reaching the temperatures inside the kilns, where the high humidity of iron-nickel ore causes great difficulties in the process of frying in rotary kilns.Because of not achieving high temperatures in rotary kilns, the preparation of the calcine for electric furnace does not reach the proper preparation.The amount of calcine during 2016 that entered the electric furnace was 291919.64 tons, the amount of energy consumed for melting calcine in electric furnace, reached 553.42kWh / t calcine, while the amount of electricity consumed was 57.92 MWh /t Ni.

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