Coal Its Properties Analysis Classification Geology Extraction Uses And Di
Coal Its Properties Analysis Classification Geology Extraction Uses And Di
Elwood S Moore
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The conchoidal fracture is not so well developed as in anthracite, and the cleats are more numerous. It crumbles more readily in the fire and owing to a greater percentage of volatile matter it kindles more readily than anthracite and emits a small amount of yellow flame when ignited. Owing to more rapid consumption its efficiency is greater than that of anthracite for certain purposes. The volatile 1 Rogers, H. D. , Geology of Pennsylvania, pp. 988-990, 1858. 2 Analyses of coals in the United ...States. Bur. Of Mines, Bull. 22, 1912. 3 Op. Cit. PLATE IV. FIG. I. Subbituminous coal showing irregular fracture. FIG. 2. Pennsylvania anthracite showing typical conchoidal fracture. (9-0 94 VARIETIES AND RANKS OF COAL matter varies from 6 to 1 1 per cent and averages from 7 to 8 per cent. The specific gravity is about 1. 4. Analyses of this type of coal from the United States 1 indicate the following range in composition: Moisture i . 96- 7 . 94 per cent Volatile matter 6. 81-32 . 46 Fixed carbon 58 .
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