Type of Document Dissertation Author Phillips, Dennis Ivan Author's Email Address email@example.com URN etd-4198-14140 Title Optimum Processing of 1 mm by Zero Coal Degree PhD Department Mining and Minerals Engineering Advisory Committee
Advisor Name Title Yoon, Roe-Hoan Committee Chair Adel, Gregory T. Committee Member Luttrell, Gerald H. Committee Member Palowitch, E. R. Committee Member Wicks, Alfred L. Committee Member Keywords
- Coal processing
- coarse coal flotation
- fine coal
- column flotation
Date of Defense 1998-04-09 Availability unrestricted AbstractCoal in the finer particle size ranges (below 1 mm) has always suffered from poor
cleaning efficiencies. This problem has been exacerbated in recent years with the increased
amount of high ash fines due to continuous mining machines and the mining of dirtier coal
seams. In the present work, it is proposed to improve overall plant efficiencies by processing
coarser coal in column flotation than is now commonly treated by that method. Column
flotation for coarse coal is supported by actual lab and plant test data that result in a full-scale
column plant installation. The fundamentals of coarse particle detachment from bubbles are
reviewed and a new simplified model is developed which better handles cubical and
rectangular coal particles.
Much of the lower efficiency of fine coal cleaning is due to poor size separation of
the fine-sized raw coal which results in misplaced high ash fines reporting to the coarser size
streams. By sending coarser material to column flotation, the finest size separation that takes
place in a plant can be as coarse as 0.5 mm or greater. The proper use of wash water in a
flotation column then becomes the best mechanism for desliming of the high ash clays. This
work quantifies the benefits of removing the high ash fines from the plant product and
increasing overall plant yield by increasing the amount of near-gravity coarse material. The
resulting yield gain is greater than that obtained from only the increased fine coal recovery.
Methods of column operation for improved coarse coal recovery are also evaluated.
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