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Show 28 depends upon many physical and' chemical characteristics of importance Physical while the porosity, and other matter, composition are of shape. 5 coking coal melts and as always gas definite size for the blast furnace diameter, and in or contains and rapidity coking matter in process. aside from ash and Porosity with which the coal and percentage of carbon which may to the coke oven are cubic too friable specifications. re coal is of utmost a The coal substance a little porous cellular mass, residual volatile of the coal is an index to the sultant coke will burn, and be consumed without and blast furnace process. 7 coking uniform tarry matter, which is volatilized and vapors in the and which, a substantially and will not conform to the above 6 matter, is solid, fixed carbon. most a then, after devolatilization, freezes into which is coke, of the matter, ash, moisture, sulphur, operators like coke pieces of four" inches in easily), too passes off ease size, friability and However, most coal and its resultant coke (crumbles A or screen importance chemically. Most b last furnace size, about three are of volatile It is desirable to have coke of process. properties and characteristics. importance. contributing The content of volatile High volatile coal, in instances, results in coke which is usually too small for the most economical blast furnace 5 use. Arthur J. Boynton, Industry," Proceedings 6 Ibid. 7 rsia., p, 17. "The Requirements of a Successful Steel City Steel Conference _,{1945}, of the Salt Lake p. 16. |
