Офлюсовані локальні спеки – огрудкована залізорудна моносировина для сучасної доменної плавки

Abstract

The technology of obtaining fluxed local cakes from iron ore concentrates of different degree of separation has been developed and tested. It has been shown that from one concentrate with different content of SiO2 (1-10%) it is possible to produce fluxed local cakes consisting of a mixture of different basic raw pellets: low-basic – high-temperature and high-basic – low-temperature. Taking into account the positive effect of increasing the iron content in iron ore raw materials on the productivity of the blast furnace and the specific consumption of coke, a method for the production of fluxed local cakes with higher iron content than it is in the sinter and pellets, has been developed. The method is used for the production of fluxed local cakess with a high content of residual carbon due to the use of less scarce and cheap varieties of solid fuels instead of expensive and scarce metallurgical coke. Technological possibilities, indicators of production and metallurgical characteristics of fluxed local cakes have been analyzed. It has been shown that it is technologically possible to obtain a complex fluxed lumpy material with all these metallurgical characteristics, that is local cakes with high iron content and residual carbon. The technology for obtaining such material, which rationally and simultaneously used the above elements of technologies with some technological simplifications has been developed and tested. At the last stage the technology of obtaining mono-raw materials in the form of fluxed local cakes with rolling of a certain thickness shell from high-temperature charge on pieces of anthracite and metallized pellets to prevent their oxidation, which significantly reduces the oxidation of carbon in solid fuels and metallization, was developed