Розробка технології конвертерної плавки із заміною частини вапна кінцевим конвертерним шлаком і вапняком

The object of research is the technology of converter smelting with the replacement of a part of lime with limestone and the final converter slag. The purpose of the work: to determine the technological possibility of conducting a converter smelter with the replacement of part of the lime with limestone and the final converter slag. As a result of the work carried out, a literature analysis of the issue of replacing lime in the oxygen-converter process with other slag-forming materials, laboratory studies with the determination of the solubility of lime in converter slag with different amounts of underfired from 2,20 to 38,10% were performed. It has been proven that the carbon monoxide released during the dissociation of limestone, destroying the crust, contributes to the dissolution of lime. When using materials containing CaO, smelter slags had the best refining properties when using pure weakly deionized dolomite in the amount of more than 3 tons per smelter. Additives of dolomite ensured a decrease in the consumption of fluorspar by 0,7 kg/t of steel and a fairly high degree of desulfurization (38,3%), at the same time, the phosphorus content was slightly higher than in conventional melts, although it did not exceed the DST limits. It has been experimentally established that the use of lime with different degrees of firing, the replacement of part of lime with limestone, as well as the replacement of part of lime with limestone and the final converter slag does not make any significant changes in the operation of converter smelting technology. Recommendations were developed in TI 232-143-96 on converter smelting technology using limestone and final converter slag