Micro-agglomerate flotation for deep cleaning of coal. Final report

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The development of practical technologies for the deep cleaning of coal has been seriously hampered by the problems of carrying out efficient coal/mineral separations at the very fine sizes (often finer than 10 {micro}m) needed to achieve adequate liberation of the mineral matter from the coal matrix. In this investigation a hybrid process--Micro-agglomerate flotation--which is a combination of oil-agglomeration and froth flotation was studied. The basic concept is to use small quantities of oil to promote the formation of dense micro-agglomerates with minimal entrapment of water and mineral particles and to use froth flotation to separate these micro-agglomerates from the ... continued below

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146 p.

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Chander, S. & Hogg, R. January 15, 1997.

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This report is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 16 times . More information about this report can be viewed below.

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  • Pennsylvania State University
    Publisher Info: Pennsylvania State Univ., University Park, PA (United States)
    Place of Publication: University Park, Pennsylvania

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Description

The development of practical technologies for the deep cleaning of coal has been seriously hampered by the problems of carrying out efficient coal/mineral separations at the very fine sizes (often finer than 10 {micro}m) needed to achieve adequate liberation of the mineral matter from the coal matrix. In this investigation a hybrid process--Micro-agglomerate flotation--which is a combination of oil-agglomeration and froth flotation was studied. The basic concept is to use small quantities of oil to promote the formation of dense micro-agglomerates with minimal entrapment of water and mineral particles and to use froth flotation to separate these micro-agglomerates from the water/dispersed-mineral phase. Since the floating units will be relatively large agglomerates (30--50 {micro}m in size) rather than fine coal particles (1--10 {micro}m) the problems of froth overload and water/mineral carryover should be significantly alleviated. There are, however, complications. The process involves at least five phases: two or more solids (coal and mineral), two liquids (oil and water) and one gas (air). It is demonstrated in this study that the process is very sensitive to fluctuations in operating parameters. It is necessary to maintain precise control over the chemistry of the liquid phases as well as the agitation conditions in order to promote selectivity. Both kinetics as well as thermodynamic factors play a critical role in determining overall system response.

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146 p.

Notes

OSTI as DE99001433

Source

  • Other Information: PBD: 15 Jan 1997

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  • Other: DE99001433
  • Report No.: DOE/PC/92543--T16
  • Grant Number: FG22-92PC92543
  • DOI: 10.2172/303997 | External Link
  • Office of Scientific & Technical Information Report Number: 303997
  • Archival Resource Key: ark:/67531/metadc687357

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  • January 15, 1997

Added to The UNT Digital Library

  • July 25, 2015, 2:20 a.m.

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  • Feb. 20, 2017, 1:17 p.m.

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Chander, S. & Hogg, R. Micro-agglomerate flotation for deep cleaning of coal. Final report, report, January 15, 1997; University Park, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc687357/: accessed August 17, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.