Non-intrusive measurement of particle charge: Electrostatic dry coal cleaning

Technical Report · Wed Jan 01 00:00:00 EST 1992

DOI:https://doi.org/10.2172/6765648· OSTI ID:6765648

Triboelectric charging/electrostatic separation experiments were performed using mineral pyrite, spherical silica, two coals and a carbon-silica spherical particle mixture. Two dimensional particle velocities in the separation chamber, as well as the number density distribution, were measured by a laser Phase Doppler Particle Analyzer (PDPA) for different tribocharging loop velocities (6--15 m/s). Particle deposition on the separation chamber's cathode and anode as well as the material passing through the separator were collected, weighed and analyzed to determine the separation efficiency. Typically, for a feed coal with 11 % ash, the coal recovery was around 70--95% with an ash content of about 4%. Deposits on the anode accounted for approximately 20% of the total feed weight and contained about 20% ash, while the cathodedepositions accounted for 70--90% of the total feed and contained less than 4% ash. Approximately 10--15% of the feed did not accumulate on either electrode and was collected at the bottom of the separation chamber. The net electric current induced in the copper charging loop when transporting coal particles (size range 38--45 microns) was much less than that for single component particles such as silica. This may bedue to a charge cancellation effect as a result of mineral matter and coal charging oppositely.

• Research Organization: Kentucky Univ., Lexington, KY (United States). Center for Applied Energy Research
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: FG22-91PC91290
• OSTI ID: 6765648
• Report Number(s): DOE/PC/91290-T5; ON: DE93014970
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CARBON
SEPARATION PROCESSES
COAL
CLEANING
PARTICULATES
ELECTRIC CHARGES
PYRITE
SILICON OXIDES
ELECTRIC FIELDS
ELECTROSTATICS
EXPERIMENTAL DATA
MEASURING METHODS
PROGRESS REPORT
SPHERES
CARBONACEOUS MATERIALS
CHALCOGENIDES
DATA
DOCUMENT TYPES
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
INFORMATION
MATERIALS
MINERALS
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PARTICLES
SILICON COMPOUNDS
SULFIDE MINERALS
010300* - Coal
Lignite
& Peat- Preparation- (1987-)