Development of technologies with a purpose of increasing of metallurgical properties of Kachkanar pellets

A blast furnace technology developed, using equally basicity Kachkanar iron ore raw materials. Research work carried out to study gas media content and pellets basicity influence on their structure and metallurgical properties, as well as basicity and fuel content in the burden influence on metallurgical properties and structure of sinter. It was determined, that usage of low basicity pellets and high basicity sinter with weak rupture during reduction, provide a high gas penetrability in the upper horizons of blast furnace.It was shown, that presence of amphoteric titanium oxides and aluminum in Kachkanar sinter and pellets, as well as decrease of slope angle of the shaft in blast furnace prevents the early sticking of burden materials in the lower horizons of the furnace, that provides smooth burden lowering, high degree of gas reduction potential usage and thus the increase of the furnace productivity as well as coke rate decrease.An analysis of the work to optimize the technology of pellets production of Kachkanar concentrates made. It was determined, that an increase of the pellets quality can be reached as a result of implementation of a technology of their roasting with a partial dissociation of hematite. A complex estimation of metallurgical properties of partially dissociated pellets carried out. It was shown, that the pellets with hematite-magnetite structure, being a result of partial dissociation of hematite, are reduced at higher temperatures, when their intensive swell and rupture at the stage of hematite-into-magnetite transfer do not happen.