Coke and Chemistry最新文献

Humous and hymatomelanic acids are obtained by separating humic acids from Kansk-Achinsk and South Ural lignite. The yield of humic material is greatest for naturally oxidized lignite from the Tisul’sk field in Kansk-Achinsk Basin: 60.9% humic acids, 49.6% humous acids, and 11.3% hymatomelanic acids. The acid fractions are characterized by Fourier transform IR (FTIR) and ¹³C NMR (CPMAS) spectroscopy, as well as elemental and technical analysis. The elemental composition and structural group composition of the humic, humous, and hymatomelanic acids differ significantly. The composition of the humic acids is complex, with aromatic and aliphatic fragments. The hymatomelanic acids consist mainly of aliphatic fragments. The content of carbon and aromatic fragments is higher for humous acids, which are insoluble in alcohol, than for hymatomelanic acids.

Nonclinkering coal from the Shubarkol, Kuu-Chek, and Sary Adyr fields in the Karaganda region of Kazakhstan are considered; the types of coal and their properties are determined, and coal samples are subjected to petrographic analysis. Technology for producing special coke from such coal is outlined. The influence of this technology on the properties and microstructure of the reducing agents produced is studied. The reducing agents may be used in the electrothermal production of industrial-grade silicon.

The material composition of magnetic fractions in fly ash and slag from lignite-based thermal power plants is studied. The production of high-quality iron concentrate by magnetic separation is hindered by the high content of Ca, Mg, and Mn oxides in spinels of magnetite type (up to 13% altogether). The magnetic fraction includes a considerable proportion of glassy phase (up to 15%), containing 15–45% Fe₂O₃. The probable limiting iron content in the final product is 59–60% (84.4–85.8% Fe₂O₃). The magnetic fraction of the fly ash and slag may be recommended as the iron-bearing component of ore–carbon briquets. Coal based on incompletely burned lignite concentrate without additional treatment is not sufficiently reactive for use as the carbon component of such briquets. It is shown here for the first time that, with appropriate treatment, both components may be used together in ore–carbon briquets suitable for the blast furnace.

The introduction of charge stamping requires preliminary laboratory research to determine the parameters with the most influence on the strength of the stamped coal cake and the quality of the final coke. The influence of coal of different metamorphic development on the strength of the stamped briquet is determined. The optimal characteristics of the unstamped batch are established, and the quality of coke produced from stamped batch with an elevated content of poorly clinkering KO coal is assessed in terms of the reactivity CRI and hot strength CSR.

Abstract

Blast furnace operators have achieved a remarkable reduction in coke usage, reaching an optimal level by boosting PCI injection alongside superior coke quality in expansive blast furnace capacities. Technological advancements in blast furnaces have left a profound impact on coke quality. Achieving high injection rates of pulverized coal, maintaining an optimal coke rate, ensuring consistent coke quality, and managing coke costs effectively are achievable only through cutting-edge cokemaking technology. The current landscape of the metallurgical coal market reflects significant technological and techno-commercial shifts compared to past decades. These changes have been diverse over recent decades and will continue to evolve in the future. Thus, it’s imperative to produce desired coke attributes such as coke strength after reaction, coke reactivity index, and M40/M10 ratio to optimize costs and enhance hot metal productivity through the application of appropriate cokemaking techniques. Consequently, selecting the right cokemaking technology stands as a crucial factor in staying competitive within the dynamic global steel market. This study aims to delve into the criteria guiding the selection of optimal cokemaking technology, aiming for high-quality coke production at the most favourable costs, thereby optimizing hot metal expenses. Furthermore, the comparative analysis of various cokemaking technologies, elucidating their pros and cons impacting coke quality and cost, is thoroughly presented. The paper underscores the paramount importance of selecting the right cokemaking technology to yield economically desirable coke quality for effectively operating larger blast furnace capacities.

A construction and installation department has been established at PAO Koks so as to eliminate the need for external contractors during construction, repair, and upgrading of the facilities.

The large-scale automation of production at PAO Koks is described.

At a certain stage, any large industrial exercise faces the problem of keeping its equipment operational in order to maintain production. Most often, internal maintenance services fill this role, although sometimes the work is outsourced. The approaches adopted at OAO Koks today and during its history are considered.

Information security in the automated production control system at PAO Koks is discussed. Organizational and engineering aspects of security required to ensure accessibility, integrity, and confidentiality of data in the critical information infrastructure are noted.

The correct choice of a profession and appropriate career guidance are important not only for the prospects of young people but for the development of society. Experience with career guidance for schoolchildren as part of a long-term strategy for cooperation with the region’s educational institutions is described here. The system of career guidance established today at PAO Koks will improve the prestige of the engineering professions in the Kemerovo region of Kuznetsk Basin, attract students to work at the plant, and provide high-quality professional training for young scientists.