Question

under extreme condition anthracite
can chang in to​

Answer 1

Answer:

Increase in the addition of coke or anthracite has been usually applied to improve the strength of produced sinter. However, its excessive addition sometimes leads conversely to decreases in strength and yield through a decrease in the formed amount of calcium ferrite phase and increases in secondary hematite and slag phases due to an excessive increase in the bed temperature. On this background, injection technology of hydrocarbon gas from the top of the sintering bed has been developed. It also aims at a thermal compensation for the upper part of the sintering bed, which tends to lack for heat. It makes the sintering bed keep longer time at proper temperature range, i.e., between 1200 and 1400 °C. Hence, formation of calcium ferrite phase is promoted and the produced sinter has good strength and reducibility.

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Answer 2

Explanation:

Anthracite, also called hard coal, the most highly metamorphosed form of coal. It contains more fixed carbon (86 percent or greater on a dry, ash-free basis) than any other form of coal and the least amount of volatile matter (14 percent or less on a dry, ash-free basis), and it has calorific values near 35 megajoules per kilogram (approximately 15,000 British thermal units per pound), not much different from the calorific values for most bituminous coal.