Carbonation as a binding mechanism for coal/calcium hydroxide pellets. Final technical report, 1 September, 1992--31 August, 1993
- Illinois State Geological Survey, Champaign, IL (United States)
- Univ. of Illinois, Urbana, IL (United States)
- Army Construction Engineering Research Lab., Champaign, IL (United States)
This research was an investigation of calcium hydroxide, a sulfur-capturing sorbent, as a binder for coal fines. The reaction of carbon dioxide with calcium hydroxide, referred to as carbonation, was studied as a method for improving pellet quality. Carbonation forms a cementitious matrix of calcium carbonate. Research has demonstrated that calcium hydroxide is a viable binder for coal fines and that a roller-and-die pellet mill is an effective method of pellet formation. From a minus 28 mesh preparation plant fine coal sample, a roller-and-die pellet mill produced strong pellets when 5 and 10% calcium hydroxide was used as a binder. The pellets containing 10% calcium hydroxide strengthened considerably when air cured. This increase in strength was attributed to carbonation via atmospheric carbon dioxide. Pellets containing 10 wt% calcium hydroxide were produced using an extruder but pellets formed in this manner were much weaker than pellets produced with the roller-and-die mill. In tests performed using a laboratory hydraulic press, the effect of particle size and compaction pressure on pellet strength was studied. Particle distributions with mean sizes of 200, 90 and 40 microns were tested. The results indicate that pellet strength increased with decreasing particle size and increasing compaction pressure when calcium hydroxide was used as a binder. Pellets containing 10 wt% calcium hydroxide increased in strength by approximately 40% when air dried for one day. As above, this increase in strength was attributed to carbonation of the calcium hydroxide via atmospheric carbon dioxide.
- Research Organization:
- Illinois Dept. of Energy and Natural Resources, Springfield, IL (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FC22-92PC92521
- OSTI ID:
- 10132233
- Report Number(s):
- DOE/PC/92521-T92; ON: DE94008034; BR: AV0100000/AV0102000; TRN: AHC29406%%20
- Resource Relation:
- Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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Carbonation as a binding mechanism for coal/calcium hydroxide pellets. Technical report, December 1, 1992--February 28, 1993
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Related Subjects
COAL
PELLETIZING
CALCIUM HYDROXIDES
CHEMICAL REACTIONS
CARBON DIOXIDE
COAL FINES
WASTE PRODUCT UTILIZATION
PROGRESS REPORT
COAL PREPARATION
TAILINGS
MATERIALS RECOVERY
SOLID FUELS
TENSILE PROPERTIES
COMBUSTION PROPERTIES
EXPERIMENTAL DATA
010300
010800
PREPARATION
WASTE MANAGEMENT