Abstract
The causes of the corrosivity of mine atmospheres and mine waters are described in detail. The principal factors promoting atmospheric corrosion in underground coal mines are high relative humidity (>90%), high temperature (∼30°c) and airborne dusts. The characteristics of mine waters are presented and discussed. The causes of the acidity of mine waters have been explained in terms of the decomposition and oxidation of pyrites, the presence ofthiobacillusthio-oxydansand thiobacillusferro-oxydans, etc., and the presence of peaty acids. The acidity of mine water contributes both directly and indirectly to the corrosivity.
About twenty mine water samples from Jharia coal mines were selected for preliminary studies. The samples were found to be slightly acidic or neutral and only mildly corrosive. Some mine waters corroded to the same extent whether they had a negative or positive value of the saturation index. This has been attributed to the presence of aggressive ions, i.e., chloride and sulphate, in the mine water. This is further confirmed by the finding that the rate of corrosion in mine water containing chloride ion is of the same order as that in Nael solution of the same concentration. Similar studies are now in progress on mine atmospheres and mine waters which are highly corrosive.
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