Removal of organic and inorganic sulfur from Ohio coal by combined physical and chemical process. Final report Page: 64 of 237
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the use of FR-7A flocculant ahead of flotation, increases the
coal recovery significantly. This is due to the fact that in
flotation process particle size directly affect the recovery.
The optimum size for flotation is approximately 200 micron.
However, the unflocculated slurry has an average size of
approximately 5-10 micron; therefore, when no flocculant was
used, some degree of cleaning was observed but the recovery was
low. In contrast, when flocculant was used the particle size
especially the coal particles sizes are increased thus increasing
the recovery of the process. Therefore, one may conclude that
using PAAX and FR-7A can result in cleaner coal with relatively
high recovery even for ultrafine slurries.
Selection of The Flocs Separation Method
The technique used to separate the flocs is an important
element of the selective flocculation process. Ideally, the
separation process should be such that it does not break or
disintegrate the flocs structure. Its design should be
compatible with the selective flocculation process. In other
words, uses the same fundamental surface chemical principals for
separation. Naturally, design of such a process was beyond the
scopes of this project. However, several methods were tested to
establish the significant effect a good separation process might
have on the outcome of the results.
Several techniques were used to separate the flocs;
namely, dissolved-air flotation (DAF), sedimentation, and froth58
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Attia, Y. A.; Zeky, M. El.; Lei, W. W.; Bavarian, F. & Yu, S. Removal of organic and inorganic sulfur from Ohio coal by combined physical and chemical process. Final report, report, April 28, 1989; Columbus, Ohio. (https://digital.library.unt.edu/ark:/67531/metadc1386690/m1/64/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.