POC-Scale Testing of a Dry Triboelectrostatic Separator for Fine Coal Cleaning. Technical Progress Report for the Twentieth Quarter, July 1-September 30, 2000.
Yoon, R. H. ; Luttrell, G. H. ; Luvsansambuu, B. ; Walters, A. D.
Work continued during the past quarter to improve the performance of the POC-scale unit. For the charging system, a more robust 'turbocharger' has been fabricated and installed. All of the internal components of the charger have been constructed from the same material (i.e., Plexiglas) to prevent particles from contacting surfaces with different work functions. For the electrode system, a new set of vinyl-coated electrodes have been constructed and tested. The coated electrodes (i) allow higher field strengths to be tested without of risk of arcing and (ii) minimize the likelihood of charge reversal caused by particles colliding with the conducting surfaces of the uncoated electrodes. Tests are underway to evaluate these modifications. Several different coal samples were collected for testing during this reporting period. These samples included (i) a 'reject' material that was collected from the pyrite trap of a pulverizer at a coal-fired power plant, (ii) an 'intermediate' product that was selectively withdrawn from the grinding chamber of a pulverizer at a power plant, and (iii) a run-of-mine feed coal from an operating coal preparation plant. Tests were conducted with these samples to investigate the effects of several key parameters (e.g., particle size, charger type, sample history, electrode coatings, etc.) on the performance of the bench-scale separator.
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