Characterization of multiphase fluid flow during air-sparged hydrocyclone flotation by x-ray CT
During this quarter a new set of experiments was carried out with and without collector in order to understand the flow patterns inside the ASH unit for both hydrophilic and hydrophobic particles. These tests were designed to study the effects of percent solids in the feed, A* - the nondimensional ratio of overflow opening area to underflow opening area, and the effect of collector addition on the flow characteristics. These experiments were done with 0%, 5% and 15% solids in the feed. The latter two cases were studied for three different A* values and also with and without the addition of collector. The value of Q*, the dimensionless ratio of air f low rate and slurry flow rate was maintained at the same level (Q* 4.55). Quartz particles of size [minus]100 +200 mesh were used for this study rather than coal particles because they did not abrade and were of a higher density. The reagents and their dosages used were 40 ppm (water basis) of frother (MIBC) and 800 g of collector (dodecyl amine) per ton of solids in the suspension. At room temperature, quartz is intrinsically hydrophilic while addition of the amine collector renders the quartz particles hydrophobic. The absence of collector will be referred to as the hydrophilic case and the presence of collector will be referred to as the hydrophobic case.A total of 11 scans was taken over the entire length of the ASH unit. Software has now been developed to analyze the CT images obtained from these tests and is able to account for any offset of the air core from the axis of the ASH. In this way, the image is reconstructed and a radial density profile of the time averaged flow is generated. Some experimental results are presented graphically in Figures 1 through 4 at 0% and 5% solids in the suspension for both hydrophilic and hydrophobic cases.
- Research Organization:
- Utah Univ., Salt Lake City, UT (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-90PC90311
- OSTI ID:
- 6649741
- Report Number(s):
- DOE/PC/90311-10; ON: DE93012471
- Country of Publication:
- United States
- Language:
- English
Similar Records
Characterization of multiphase fluid flow during air-sparged hydrocyclone flotation by x-ray CT. Twelfth quarterly report, 14 May--13 August 1993
Characterization of multiphase fluid flow during air-sparged hydrocyclone flotation by x-ray CT. Eighth quarterly report, 14 May 1992--13 August 1992
Related Subjects
COAL
FLOTATION
CYCLONE SEPARATORS
MULTIPHASE FLOW
COMPUTERIZED TOMOGRAPHY
AIR
COAL PREPARATION
EXPERIMENTAL DATA
FUEL SLURRIES
PROGRESS REPORT
QUARTZ
X RADIATION
CARBONACEOUS MATERIALS
CONCENTRATORS
DATA
DIAGNOSTIC TECHNIQUES
DISPERSIONS
DOCUMENT TYPES
ELECTROMAGNETIC RADIATION
ENERGY SOURCES
EQUIPMENT
FLUID FLOW
FLUIDS
FOSSIL FUELS
FUELS
GASES
INERTIAL SEPARATORS
INFORMATION
IONIZING RADIATIONS
MATERIALS
MINERALS
MIXTURES
NUMERICAL DATA
OXIDE MINERALS
POLLUTION CONTROL EQUIPMENT
RADIATIONS
SEPARATION EQUIPMENT
SEPARATION PROCESSES
SLURRIES
SUSPENSIONS
TOMOGRAPHY
010300* - Coal
Lignite
& Peat- Preparation- (1987-)