Piliugin I. Improvement of ways of the return preparation at sintering production

The object: sintering process. The subject: the process of blast-furnace charge sintering with ordinary, calibrated and granulated return. Methods: laboratory investigations, with the objective of determining the influence of the amount and size of the return upon productivity of the sintering unit and strength of sintered iron ore; physical simulation, mathematical statistics, comparative analysis of the obtained data; active and passive experiments, performed on metallurgical iron and steel unit. The thesis theoretical fundamentals of intensification of the process of ore sintering due to replacement of the return of 0-5 mm fraction in the sintering charge by calibrated and granulated return of 3-5 mm fraction were further developed. The following indices were suggested: output of standard stabilized sintered ore and productivity of the output of standard stabilized sintered ore, taking into account removal of the fraction less than 5 mm at all treatment stages with standard destroying actions. It was found out experimentally that efficient application of granules in blast furnace charge which were obtained by extrusion method could bring better results. On the basis of investigations of granules strength, addition of which promoted improvement of productivity of the blast furnace process and optimal compositions of 3-component charge for their extruding were determined. A method of iron ore materials sintering and facilities for manufacturing granules by extruding were designed. A method of granulating of sintered ore removal was also developed.