Coal surface control for advanced fine coal flotation

Abstract

various locations isdetailed inChapterI. Although theemphasis oftheproject was research, the preparation ofreports was paramount inmakingthis project a succa_s. The compilation ofdata and the writing of this report was, perhaps, the single most time-comuming task involved with this research project, and therefore we would like to acknowledge those who spent long hours writing, editing and preparing this report. A significant part of this final report is based on the project's First Annual Report, a good portion of which was written and coordinated by Vas Choudhry of Praxis Engineers, Inc.. The research group at Columbia University was responsible for summarzing their O work, which is reported in certain sections of Chapters 3, 5, 9, 10 and 12. Also, we would like to thank Jianli Diao of Berkeley, who not only wrote Chapter 11 but also contributed to many of the other chapters, helped edi'. a large part of the first draft, and assisted in the final revision. The ini,'iial goal of"the research project was to develop methods of coal surface control in advanced froth flotation to achieve 90% pyritic sulfur rejection, while operating at Btu recoveries O above 90% based on run-of-mine quality coal. Moreover, the technology is to concomitantly reduce the ash content significantly (to six percent or less) to provide a high-quality fuel to the i boiler (ash removal also increases Btu content, which in turn decreases a coal's emission potential in terms of lbs SO2/million Btu).Upon the award of the contract, the initial effort was focused on the collection 'of samples from six coal seams, three designated as base coals and three as additional coals, to provide samples fbr research work, coal weathering studies and washability testing. remove the overburden and floor shale material. Each base coal sample was reduc,ed to a topsize of 4 to 6 inches, homogenized and split into two parts, one for use in the weathenng studies and the other for research and washability studies. "Dte research and washability sample was split into 400.1b lots using 20-lh increments and packed into 55 gallon drums, inene, d with argon and then distributed.The additional coal samples were also reduced to a topsize of 4 to 6 inches, homogenized and packed in 400-lh lots, and inerted with argon prior to shipping. Approximately 9 tons of coal (research and weathering samples) was shipped to the University of California, 6 tons to the University of Pittsburgh, and 6 tons of coal to commercial testing laboratories for washability testing. Over 42 tons of coal was used to set up the weathering studies of the three base coals at the three mine sites. Another 21 tons was stored in inerted drums as a reserve sample for future use on this project or on other projects funded by DOE. Examination of the ultimate (elemental) analysis results shows that the bulk carbon-tooxygen ratio (number in the parentheses) follows the order:Upper Freeport PA (19.9) > Pittsburgh No. 8 (I1.1) > Illinois No. 6 (10.5).The dry mineral matter free (dmmf) carbon content of the th...

Grinding Behavior and Potential Beneficiation Options of Bauxite Ores

“…The magnetic separation efficiency was also investigated using the Fuerstenau-II upgrading curves which relate recoveries of components in products [56,57]. Figure 14a shows the Fuerstenau-II upgrading plots of different feed fractions when the material filling volume fc was 10%.…”

“…Figure 14a shows the Fuerstenau-II upgrading plots of different feed fractions when the material filling volume fc was 10%. It is shown that better separation of Al2O3 from Fe2O3 in the concentrate (non-magnetic The magnetic separation efficiency was also investigated using the Fuerstenau-II upgrading curves which relate recoveries of components in products [56,57]. Figure 14a shows the Fuerstenau-II upgrading plots of different feed fractions when the material filling volume f c was 10%.…”

Evaluation of frothers based on properties of the solids/liquid/gas system

“…The selectivity of flotation and also the frother dose can be determined with the help of the upgrading plot, that is graphs relating quality and quantity of the separation process products. Very useful for this purpose is the Fuerstenau upgrading plot, relating recovery of a flotation feed component in flotation products [16,17]. There are four versions of the Fuerstenau upgrading curve [5].…”

Column Flotation of Subbituminous Coal Using the Blend of Trimethyl Pentanediol Derivatives and Pico-Nano Bubbles

“…Xanthate was also used as a pyrite depressant in the coal flotation (Fuerstenau et al, 1990). The addition of xanthate shows improvement of flotation efficiency at pH 6-8.…”