Development of enhanced sulfur rejection processes. Final technical progress report, fifth quarter, October 1--December 31, 1993
Two complementary concepts for improving the removal of inorganic sulfur from many eastern US coals are the Electrochemically Enhanced Sulfur Rejection (EESR) and Polymer Enhanced Sulfur Rejection (PESR). The EESR process uses electrochemical techniques to suppress the formation of hydrophobic oxidation products believed to be responsible for the floatability of coal pyrite. The PESR process uses polymeric reagents that react with pyrite and convert floatable middlings (composite particles composed of pyrite with coal inclusions) into hydrophilic particles. It is believed that these processes can be used simultaneously to maximize the rejection of both well-liberated pyrite and composite coal-pyrite particles. During the current reporting period, work was conducted in the following areas: studies of the liberation characteristics of various pyrite samples, identification of oxidation products on pyrite using XPS technique, studies of reagent adsorption on pyrite using FTIR and contact angles, identification of the most effective sacrificial anode material for depressing pyrite, and identification of the most effective polymer for depressing pyrite. Some of the more significant findings made during the current reporting periods are as follows: (1) liberation characteristics of Illinois No. 6 coal have been determined, (2) effects of pH and electrochemical potentials on the flotation of coal and mineral pyrite have been established, (3) an effective method of keeping coal pyrite under reducing conditions and, hence, preventing self-induced flotation has been developed, and (4) an effective polymeric pyrite depressant has been identified.
- Research Organization:
- Virginia Center for Coal and Minerals Processing, Blacksburg, VA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-92PC92246
- OSTI ID:
- 10107548
- Report Number(s):
- DOE/PC/92246--T6; ON: DE95005181; BR: AA0520000
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010300
010402
ABSORPTION SPECTROSCOPY
BITUMINOUS COAL
COAL PREPARATION
DESULFURIZATION
ELECTROCHEMICAL CELLS
EXPERIMENTAL DATA
FLOTATION
FOURIER TRANSFORMATION
INFRARED RADIATION
PERFORMANCE TESTING
PHOTOELECTRON SPECTROSCOPY
POLYMERS
PREPARATION
PROGRESS REPORT
PURIFICATION AND UPGRADING
PYRITE
REMOVAL
SCANNING ELECTRON MICROSCOPY
VOLTAMETRY
WEATHERING
X-RAY SPECTROSCOPY