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Development of converter smelting technology with replacement of part of lime with final converter slag and limestone

Development of converter smelting technology with replacement of part of lime with final converter slag and limestone

Abstract

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

Об'єктом дослідження є технологія ведення конвертерної плавки із заміною частини вапна вапняком і кінцевим конвертерним шлаком. Ціль роботи: визначення технологічної можливості ведення конвертерної плавки із заміною частини вапна вапняком і кінцевим конвертерним шлаком. У результаті проведеної роботи виконані літературний аналіз питання заміни вапна в киснево-конвертерному процесі іншими шлакоутворюючими матеріалами, лабораторні дослідження з визначенням розчинності вапна в конвертерному шлаку з різною кількістю недопалу від 2,20 до 38,10%. Доведене, що оксид вуглецю, що виділяється, при дисоціації вапняку, руйнуючи скоринку, сприяє розчиненню вапна. При використанні матеріалів, що містять СаО, кращі властивості, що рафінують, мали шлаки плавок при застосуванні чистого слабо обожненого доломіту в кількості більш 3 т на плавку. Присадки доломіту забезпечували зниження витрати плавикового шпату на 0,7 кг/т сталі й досить високий ступінь обезсірювання (38,3%), разом з тим вміст фосфору був трохи вище, чим на звичайних плавках, хоча й не перевищувало меж ДСТ. Експериментально встановлене, що застосування вапна з різним ступенем випалу, заміна частини вапна вапняком, а також заміна частини вапна вапняком і кінцевим конвертерним шлаком не вносить особливих змін у ведення технології конвертерної плавки. Розроблені рекомендації в ТІ 232-143-96 за технологією конвертерної плавки з використанням вапняку й кінцевого конвертерного шлаку

Keywords

флюс, технологічний шлак, slab, technological slag, якість, основність, converter, агломерат, flux, конвертер, quality, сляб, agglomerate, lime, basicity, вапно, вапняк, limestone

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
0
Average
Average
Average
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