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Title: Characterization of multiphase fluid flow during air-sparged hydrocyclone flotation by x-ray CT

The effect of A* (the dimensionless ratio of overflow opening area to underflow opening area) on the fluid flow behavior of the 2 inch ASH-2C unit was studied for different percentage of solids in the suspension. Limestone, a hydrophilic solid was chosen for study. The particle size of the solids was taken as [minus]100 [plus]200 mesh. Three different concentrations of solids in the suspension were considered, 5, 10 and 20% by weight. The corresponding pulp densities of the feed suspension for these three cases are 1.09, 1.18 and 1.36 g/cc respectively. Since no collector was added to the suspension, all the solids are expected to report to the underflow. For all these studies the Q* value was maintained at the same level (Q* = 2.28). Reconstructed images from the CT scanner were analyzed using the graphics software developed at the University of Utah. Assuming the air core to be cylindrical in shape and using the previously generated calibration curve, the average density of the swirl layer and its average thickness were estimated for each slice. These results are presented graphically in the accompanying figures along the axis of the ASH unit from bottom to top.
Authors:
Publication Date:
OSTI Identifier:
7027506
Report Number(s):
DOE/PC/90311-8
ON: DE93000920
DOE Contract Number:
FG22-90PC90311
Resource Type:
Technical Report
Research Org:
Utah Univ., Salt Lake City, UT (United States)
Sponsoring Org:
DOE; USDOE, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 47 OTHER INSTRUMENTATION; COAL PREPARATION; FLOTATION; CYCLONE SEPARATORS; COMPUTERIZED TOMOGRAPHY; EXPERIMENTAL DATA; PROGRESS REPORT; X RADIATION; CONCENTRATORS; DATA; DIAGNOSTIC TECHNIQUES; DOCUMENT TYPES; ELECTROMAGNETIC RADIATION; EQUIPMENT; INERTIAL SEPARATORS; INFORMATION; IONIZING RADIATIONS; NUMERICAL DATA; POLLUTION CONTROL EQUIPMENT; RADIATIONS; SEPARATION EQUIPMENT; SEPARATION PROCESSES; TOMOGRAPHY 010300* -- Coal, Lignite, & Peat-- Preparation-- (1987-); 440800 -- Miscellaneous Instrumentation-- (1990-)