Removal of organic and inorganic sulfur from Ohio coal by combined physical and chemical process. Final report Page: 37 of 237
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the flocs were allowed to condition for three to five minutes.
The mechanism of selective flocculation is shown in Figure 1.8.
The flocs were separated by different methods as listed
in the previous Table 1.4. Most frequently, flotation (either
dissolved-air or froth flotation) was used. The main advantage
of either of these separation processes is that the flocs do not
settle, so the pyrite which is not dispersed by the PAAX will not
report with the flocculated fraction. The equipment used to
study dissolved air flotation is shown in Figure 1.9. It
consisted of a sealed vessel (1) connected to a long cylinder
column (2) filled with packing (3). The lower end of the column
was connected to a stirred vessel (4) which was used as flotation
cell. The system was allowed to stand at 620 kPa (75 psig) for
five minutes to allow air dissolution to come to an equilibrium.
In addition to hydrophobic flocculant, 0.82 kg/ton of methyl
isobutyl carbinol (MIBC) was used as the flotation reagent.
A Galligher flotation machine was used for froth
flotation test. The cell has a capacity of 1.5 liter and mixing
was conducted at 1000 to 3000 rpm.
Finally, multiple cleaning stages were tested by
performing one and two step selective flocculation-flotation or
flocculation-sedimentation-flotation tests. For this set of
experiments, the flocs from the first cleaning stage were re-
dispersed under high shear rate mixing, and then re-flocculated.31
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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/m1/37/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.