Inhibition of Pyrite Weathering by Recycling of Selected Effluents.
Walsh-FM; Stone-RL; Engelmann-WH
Proc Ug Coal Mng Symp Coal Conf & Expo V Louisville Kentucky 10/23-25/79 Pp 139-146 Louisville:139-146
Pyrite weathering is responsible for the large loads of acid and iron in streams associated with coal mine regions of appalachia. This paper is derived from a study funded by the Bureau of Mines and describes briefly (1) the work done to verify the mechanics of weathering of pyrite entrained in fresh coal mine face material, (2) the importance of iron bacteria in catalyzing pyrite weathering, and (3) the successful laboratory test of a method for inhibiting these bacteria. Preliminary results of the ongoing laboratory tests are described. These results show that iron bacteria catalyze pyrite weathering by a factor of 4 and this catalysis can be stopped by increasing the iron concentration of water influent to the mine face material to 100 ppm. The technical basis for a practical field method for reducing by 80 percent the acid and iron loads from coal mine operations is described.
Proc. Ug Coal Mng. Symp., Coal Conf. & Expo V, Louisville, Kentucky, 10/23-25/79, Pp 139-146