| OCR Text |
Show 29 To achieve the best good coking possible chemical composition coal should contain not of 7 per cent may be maximum 7. 5 per cent and lower, if should not exceed an a utilized); approximate small amount of or ash; not sulphur. over (although the ash content should not be lower, over 4 a a ove i matter content may very, but if at all 8 possible. contained in the ash. There is A good percent moisture; about 1 per cent volatile matter, and not over sulphu: blast 10 per 1 per cent 9 The U. S. cording coke, a maximum of 35 per cent, and the phosphorus furnace coke should contain not cent 4 per cent moisture possible; volatile content should be 1. 5 per cent, usually over in Coal Commission of 1922 classified to its volatile high volatile, volatile coking matter, and fixed carbon content content 31 per cent, or as and more, a coal ac- follows: dry, mineral- matter-free fixed carbon content of less than 69 per cent; medium volatile, 22 to 31 per cent volatile fixed carbon; low matter, and 69 to 78 per cent free- 14 to 22 per cent volatile matter, and 78 to volatile, 86 per cent free-fixed carbon. 10 Table 1 shows coking coal. a comparative analysis The Carbon and Fontana is County coking coa.l highly volatile, with a of Utah and used at relatively Pennsylvania Geneva, Ironton low free-fixed carbon cont tent. Coke produced from these coals is. in and very reactive in the blast furnace. Steel 8Watkins Cyclopedia of the Publications, Inc, (1951), p. , general, very open in nature However, when sufficient size Steel Industry, (3rd 14. 10Ibid., p. 15. e d, ; Pittsburg, Pa |
