The chemical enhancement of the triboelectric separation of coal from pyrite and ash: A novel approach for electrostatic separation of mineral matter from coal. Final report
Arthur D. Little, Inc., under contract to the US DOE Pittsburgh Energy Technology Center, has developed a triboelectric separation device for coal beneficiation, that employs an entrained-flow, rotating-cylinder concept. The described apparatus has been used to test the efficacy of chemical pretreatment and in-situ treatment of coal on separation efficiency. Coal particle entrainment is achieved with gaseous carbon dioxide and particle collection is accomplished by an electrostatic plate separator. The triboelectric separation device incorporates instrumentation for the direct measurement of charge in the dilute-phase particle stream. Some of the pretreatment materials investigated under this project to modify the surface charging characteristics of the coal included oleic acid, sodium oleate, quinoline and dicyclohexylamine. Ammonia and sulfur dioxide at a concentration up to 1000 ppM was used for in-situ treatment of the coal, with carbon dioxide as the carrier/inerting gas. Nitrogen was used earlier in the test program as the carrier/inerting gas for the coal, but a severe arcing problem was encountered in the electrostatic collector with nitrogen as the carrier gas. This problem did not occur when carbon dioxide was used. The report covers the chemical treatment employed, and summarizes and interprets the results achieved. In addition, an economic analysis of a full scale system based on this concept is presented.
- Research Organization:
- Little (Arthur D.), Inc., Cambridge, MA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-87PC79888
- OSTI ID:
- 10120574
- Report Number(s):
- DOE/PC/79888-T29; ON: DE93007437
- Resource Relation:
- Other Information: PBD: Feb 1992
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL
DEASHING
DESULFURIZATION
SURFACE PROPERTIES
PROGRESS REPORT
COAL PREPARATION
ELECTROSTATICS
SEPARATION PROCESSES
OLEIC ACID
QUINOLINES
AMINES
AMMONIA
SULFUR DIOXIDE
NITROGEN
CARBON DIOXIDE
ECONOMIC ANALYSIS
EXPERIMENTAL DATA
PYRITE
CLEANING
010300
010402
PREPARATION
PURIFICATION AND UPGRADING