Washability Curves for Pyrite Removal in Coal Using Perchloroethylene as Heavy Medium
Pyritic sulfur is removed from raw, high sulfur coal by gravitational separation using a suitable solvent, or heavy medium. This is possible due to the inherent difference in the specific gravity of clean coal and the mineral matter in it. The effectiveness of perchloroethylene (PCE) as a heavy medium was experimentally evaluated. The most important factors governing the efficiency of this process are the quantity of clean coal yield and depyriting efficiency. It was found that the pyritic sulfur removal efficiency as well as the clean coal yield depended strongly on its particle size distribution and mineral matter content. This paper presents valuable data on the effect of particle size of coal on clean coal yield as well as pyritic sulfur removal efficiency. A "master" curve is obtained to determine a workable size range which gives the most optimal yield of clean and depyrited coal.
P. Vishnubhatt and S. Lee, "Washability Curves for Pyrite Removal in Coal Using Perchloroethylene as Heavy Medium," Fuel Science and Technology International, Taylor & Francis, Jan 1993.
The definitive version is available at https://doi.org/10.1080/08843759308916105
Chemical and Biochemical Engineering
Article - Journal
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