答：Introduction
Metallurgical coke is a synthetic material made from a combination of various forms of coal. The production of coke from an increased combination of metallurgical coal is known as metallurgical coke. It is also referred to as economic coke, hard coke, or just “coke.” Metallurgical coke is generally formulated from several forms of coal, such as bituminous coal, lignite, sub-bituminous coal, and anthracite. Metallurgical coke is used primarily as a fuel in smelting processes and other metallurgical processes.
Metallurgical coke is a key factor in the production of steel as it provides the heat and fuel necessary for the reaction between iron ore and a reducing agent such as carbon. Metallurgical coke is also used as a solid aggregate in gasification and liquefaction processes, as well as an additive to other fuel processes. Finally, it is used to burn the sulfur-containing compounds most efficiently when producing steel.
Production
Metallurgical coal is the primary raw material used in producing metallurgical coke. The coal is subjected to thermal treatment to remove volatiles, then processed into the desired size, either by crushing or pulverizing. The coal is also packaged and delivered to a metallurgical coke plant for manufacturing and further processing.
At the coke plant, the raw coal is composed in a large oven, or heated retort, to form a porous mass that can be thoroughly heated and combust. After this, the mass is dried and cooled, then crushed or ground into smaller pieces. These pieces are then charged into an indenter and heated again in a retort. During this process, the volatile combustible material is removed from the coke and burned off, resulting in the tight, dense mass of coke. The coke is then screened, sized, packed, and shipped.
Specifications
Metallurgical coke can take on a variety of forms and sizes, ranging from shot coke, which are small, uniform pellets to a more granular form. The dimensions of the pellets, particles, or grains of the coke depend on the specific process and the desired purpose of the product. Small shot coke is generally eight millimeters in diameter and less, while lumps of coke may be over three inches in size.
Metallurgical coke is normally composed of three key elements: ash, volatile matter, and fixed carbon. The ash content of the coke ranges from zero to 12%, with the most common range being from one to three percent. Volatile matter content ranges from five to 15%, with an average value of about 10%. The fixed carbon content is most often measured and reported as the “Coke Ratio” – the percentage by dry weight of the total fixed carbon content. The most common range for the Coke Ratio is 80% to 90%.
Conclusion
Metallurgical coke is a synthetic material made from a combination of various forms of coal, primarily used as a fuel in smelting processes and other metallurgical processes. The production of metallurgical coke involves processing raw coal into the desired sizes, then heating it in retorts to form a porous mass. The mass is then dried and cooled and the volatile combustible material is burned off, leaving behind a tight, dense mass of coke. Metallurgical coke is composed of three elements – ash, volatile matter, and fixed carbon, with ash content ranging from zero to 12% and a coke ratio ranging from 80% to 90%.
