Browsing by Author "Petrov P.B."

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    MATERIAL BALANCE MODEL FOR STEEL PRODUCTION IN ELECTRIC ARC FURNACE - MELTING PERIOD
    (2023-01-01) Petrov P.B.
    The material balance modeling during the melting period is considered in the development, as an initial period in obtaining a type of tool steel, such as bearing steel. The method used for the production of bearing steel is electric arc, with the possibility to be realized in an electric arc furnace. Based on the real chemical composition of the charge materials presented in the introduction, a model for calculation of the charge was created, consistent with the technological conduct of the process. The presented values in the experimental part and the results as well as the analysis are based on the modeling of the process made in the development during the melting period.
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    SINTERING OF A FINE FRACTION FROM “GRANCHARITSA” DEPOSIT IN LABORATORY CONDITIONS
    (2023-01-01) Petrov P.B.
    The possibilities for sintering a fine scheelite concentrate containing a significant amount of tungsten in the form of calcium tungstate (CaWO4) were considered. Scheelite originates from the Grncharitsa deposit, located near the town of Velingrad, Bulgaria The scheelite fine fraction was obtained after numerous technological and transport operations of the coarse fraction, as well as after flotation treatment of scheelite raw material. Experimentation is at the laboratory level. The influence of flux on the agglomeration process was established. Studies without flux have been also done. High-temperature metallurgical equipment was used, through which it is possible to follow the results of the process of thermal coagulation (sintering) of the charge materials. The used methodology of conducting the experiments is close to that of the classic agglomeration process in terms of thermal partial melting of the particles of the charge, by burning soot carbon, but without permeation of air through the layer of the charge (laboratory crucibles have a relatively small working volume and it was assumed that air in and above the charge will be sufficient). The main goal is to obtain a qualitative sinter and to draw conclusions regarding the processing of the scheelite fine fraction in a larger-scale apparatus, for example agglomeration.