Pyrite surface characterization and control for advanced fine coal desulfurization technologies
The objective of this project is to conduct extensive studies on the surface reactivity and surface hydrophobicity of coal-pyrites using various surface characterization techniques and to correlate the alteration of the coal-pyrite surface with the efficiency of pyrite rejection in coal flotation. The flotation characteristics of coal-pyrites under various conditions was studied and compared with ore-pyrite and coal to determine the causes of pyrite rejection difficulties in coal flotation. Both the native and induced floatabilities of pyrites were investigated. It was found that both coal- and ore-pyrites, ff prepared by dry-grinding, show little or no floatability in the absence of any chemical reagents. After ultrasonic pretreatment, ore-pyrite floats effectively in the acidic to neutral pH range. Kentucky No. 9 coal-pyrite (KYPY) shows significant flotation in the pH range 7--10. With ethyl xanthate as collector, ore-pyrite floats well up to pH = 10; while coal-pyrite reveals no flotation above pH = 6. For the first time, the effect of coal collector on the floatability of coal-pyrite has been studied. It was shown that in the presence of fuel oil--a widely used collector for promoting coal flotation, coal-pyrite, particularly for the fine sizes, shows good flotation below pH = 11, whereas ore-pyrite has no or little floatability. These studies demonstrate that one of the main causes of the coal-pyrite flotation in coal separation is the oil-induced floatability due to adsorption/attachment of oil droplets on the coal-pyrite surfaces, the native'' or self-induced'' floatability of pyrite is no as profound as the oil-induced flotation.
- Research Organization:
- Kentucky Univ., Lexington, KY (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-90PC90295
- OSTI ID:
- 7249812
- Report Number(s):
- DOE/PC/90295-T7; ON: DE92040526
- Country of Publication:
- United States
- Language:
- English
Similar Records
A study of the interfacial chemistry of pyrite and coal in fine coal cleaning using flotation
Surface electrochemical control for fine coal and pyrite separation. Final report
Related Subjects
COAL PREPARATION
FLOTATION
PH VALUE
REAGENTS
EXPERIMENTAL DATA
FUEL OILS
ORES
PROGRESS REPORT
PYRITE
REMOVAL
DATA
DOCUMENT TYPES
FUELS
INFORMATION
LIQUID FUELS
MINERALS
NUMERICAL DATA
PETROLEUM PRODUCTS
SEPARATION PROCESSES
SULFIDE MINERALS
010300* - Coal
Lignite
& Peat- Preparation- (1987-)