Laboratory Investigation Of Bio-Heap Leaching To Remove Sulfur From Kiln Feed Materials (15872d85-4950-43dc-bb8e-5b83bfbb9ba7)

The west central upper Peninsula of Michigan contains a large resource of graphitic slate. The slate has potential industrial use as a substitute for shale currently used in the production of portland cement. Some of the unweathered slate, however, has a high concentration of pyritic sulfur which can create emission problems when processed in a kiln. A low cost method to reduce the sulfur content of the slate through the optimization of pyrite oxidation in a bio-heap leaching operation was investigated.