Abstract
Coke is an integral component of the blast furnace charge; therefore, it plays an important role in the integrated steelmaking process. Achieving the required coke quality parameters by producers requires the use of a high proportion of the highest quality coking coals (hard coking coals) in the coking blends, which significantly increases the unit production costs. Approximately 75% of these costs are constituted by the cost of the coal blend’s preparation. There is a deficit in the best quality coking coals on the world market and their supply are characterized by large fluctuations in quality parameters. Therefore, from the point of view of the economics of coke production, it is advantageous to produce high-quality coke from a coke blend with the highest possible content of cheaper coals. The paper presents the results of the influence of coal charge bulk density and semi-soft coking coal content in the coking blend on the textural and structural parameters of coke, which determine its quality. Research has shown that the application of increased density influences the parameters of the texture and structure of the coke, which shape its quality parameters. The use of stamp-charging technology contributes to the improvement of the coke quality or enables the production of coke of a predetermined quality from blends containing cheaper semi-soft coals.
Highlights
World economic development is related to the production of steel
The BOF process plays a key role in the structure of steel production, which uses pig iron produced in blast furnaces
The dynamic technological development of the steel industry observed in the last decade, including on the operation of blast furnaces with an increasing volume and the use of substitute fuels (PCI, liquid fuels and natural gas), led to an increase in the importance of the physical role of coke and, an increase in the requirements for its strength parameters [6,7,8] the key role is currently assigned to the coke quality parameters assessed by the NSC (Nippon Steel Corporation) method, i.e., CRI and CSR [9,10,11]
Summary
World economic development is related to the production of steel. Steel products are used, among others, by the construction, transport, machine and automotive industries, as well as for the production of household appliances. The BOF (basic oxygen furnace) process plays a key role in the structure of steel production, which uses pig iron produced in blast furnaces (over 70% of steel produced in the world). The dynamic technological development of the steel industry observed in the last decade, including on the operation of blast furnaces with an increasing volume and the use of substitute fuels (PCI, liquid fuels and natural gas), led to an increase in the importance of the physical role of coke and, an increase in the requirements for its strength parameters [6,7,8] the key role is currently assigned to the coke quality parameters assessed by the NSC (Nippon Steel Corporation) method, i.e., CRI (coke reactivity index) and CSR (coke strength after reaction) [9,10,11]. From the point of view of the economics of coke production, it is advantageous to produce high-quality coke from a coke blend with the highest possible content of cheaper coals
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