Metallization of ore-coal briquettes in an annular furnace heated by generator gas
Year: 2025
Type: article
Abstract: The paper considers the features of producing granular pig iron using an annular furnace with a rotating hearth during implementation of ITmk3 technology ( Ironmaking Technology Mark Three ). The design of a coal gasifier with a synthesized gas purification system and the cross-section of an annular furnace are shown. The article briefly describes the process of industrial production of granular high-quality pig iron. The prospects of using the technology in question on the territory of the Russian Federation were assessed. At the first stage of research on the metallization of iron-ore concentrate (IOC) with coal, the thermogravimetric method of a complete factor experiment was used to determine the optimal metallization conditions. In the experiments, the ratio of IOC was varied: coal, size of coal, lime additives as a percentage of the amount (IOC + coal). As a result of thermogravimetric analysis, the authors obtained the curves of changes in mass of the samples, composition and amount of released gas when the heating temperature changed during sintering of IOC with coal and lime. At the second stage, a laboratory chamber furnace with a portable hearth, heated by generator gas from coal, was developed to test the ITmk3 technology. Ore-coal briquettes were made with a ratio of IOC, coal, bentonite 80:20:5 and heat-treated in a chamber furnace with heating by generator gas from a coal gasifier. Iron-ore concentrate from the Korshunovsky MPP and Kasyanovsky coal from the Cheremkhovsky deposit were used as experimental raw materials. Based on laboratory studies, the authors determined the temperature-time firing mode of ore-coal briquettes, which ensures a high degree of metallization of iron-ore materials of 80 – 87 % when firing briquettes in the temperature range of 1080 – 1424 °C for 40 min. The yield of briquettes after drying and firing was determined to be 66.45 %. The mechanism of solid-phase reduction of iron-ore materials in annular furnaces with a rotating hearth and liquid-phase separation of reduction products is considered. The composition of the gases released during calcination of ore and coal briquettes was determined.
Source: Izvestiya Ferrous Metallurgy
Institution: Siberian Federal University
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4413892989