Mine gases

Asphyxiating mine gases. As was noted above, many of the minerals found in coal mine environments oxidize briskly when in contact with atmospheric O2 ... 

Gas and Coal Dust Explosion. Title of a series of papers published by K. Mat sumo to in J Minin gins t Japan 68, 260—5 379—82 (1952) 8t CA 48, 3691 (1954). The papers include adsorption of mine gases by the coal dusts heat of adsorption of mine gases by coal dusts and ignition temperature of the coal dusts... 

Ignition and expln of combustible mine gases may be produced not only by the flame resulting from blasting with expls which are not safe to use in fiery coal mines, but also by other factors. The flame produced on expln is known as "primary or detonation flame. ... 

Refs l)Daniel (1902), 747-61 [Sftrete (Ex-plosifs de)] 2)C.Hall W.O.Snelling, US Geological Survey Bull 333 (1907) (Coal mining accidents, their causes and prevention) 3)V.Watteyne et al, Ibid, 369 (1908) (Prevention of mine explns) 4)R.T.Chamber in, Ibid 383 (1909) (Notes on explosive mine gases dusts) 5)G.S.Rice et al,... 

When the ratio of air to methane becomes very high, as in mine gases which contain about 4 per cent methane, platinum black is no longer the violently active catalyst for the oxidation it is in mixtures rich in hydrocarbon.53 The oxide type of catalysts, however, become very efficient in the temperature range of 150° to 350° C. in catalyzing the oxidation of the methane. Cobalt oxide was found to be the most effective catalyst, with manganese and nickel oxides next in order. 

J. J. Forbes and G. W. Grove, Mine Gases and Methods for Detecting Them, Bureau of Mines Miners Circular 33, U.S. Government Printing Office, Washington, D.C., 1954, pp. 3-6. 

Detectors Specialized chemical or electronic instruments nsed to detect mine gases. 

The elimination of underground smoking and open-flame lamps The required use of rock dusting The use of water sprays for dust reduction The mandatory use of pre-shift examinations for mine gases. 

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