Binderless briquetting of coal powders by an acetone treatment process. [MS Thesis]
The results of an experimental investigation of a binderless briquetting process are presented. The process involves the use of a solvent treatment step instead of using a conventional binder, and can produce water-resistant briquettes of high durability from high volatile C bituminous coals. The effectiveness of several types of solvents was determined as well as varying conditions of treatment and pressing. Treatment conditions of solvent to coal ratios, contact time, solvent temperature, and coal moisture were studied, as well as pressing conditions of temperature, pressure and coal moisture. The ketones were the most effective of the solvents studied and acetone was given the most attention due to its low cost, recoverability and fast solvent action. The optimum treatment conditions are to treat dry coal powders with acetone on a 1 to 1 weight basis for 60 sec. The acetone can be evaporated off the coal at room temperature or in an oven at 110/sup 0/C. The acetone may also be removed by leaching with water and recovered through distillation. Wet coal powders can also be treated if the moisture level is kept below 15 to 20%. The optimum pressing conditions were determined for acetone treated powders that were briquetted with a Buehler Specimen Mount laboratory press. The conditions are a pressure of 10,000 to 12,000 psi, a temperature of 150/sup 0/C, a pressing time of 5 min, and a coal moisture level of less than 5%. Briquettes made from acetone treated coal powders demonstrated superior resistance to water penetration and degradation. The process has potential for scale-up to an industrial size by using a roll-press briquetter.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6922161
- Report Number(s):
- IS-T-1022; ON: DE83004977
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
COAL FINES
BRIQUETTING
ACETONE
CLEANING
COAL PREPARATION
EXPERIMENTAL DATA
GRINDING
KETONES
ORGANIC SOLVENTS
PRESSING
RECOVERY
COMMINUTION
DATA
FABRICATION
INFORMATION
MACHINING
MATERIALS WORKING
MOLDING
NUMERICAL DATA
ORGANIC COMPOUNDS
SOLVENTS
013000* - Coal
Lignite
& Peat- Transport
Handling
& Storage