Abstract: There commonly exist pyrite minerals in coal-bearing strata in one region, but it is difficult to separate. Therefore, taking the pyrite minerals from the mine as samples, the process mineralogy on this sample was made. The results indicated that the key reason of being hard to separate this kind of pyrite was because of its fine disseminated particle, and close intergrowth with gangue minerals. In order to make the pyrite's single mineral separation degree up to 80%, it needs to be ground to below 10 μm.

Key words: Refractory coal pyrite, Process mineralogy, Process size, Single mineral liberation