A new approach to enhance the selectivity of liberation and the efficiency of coal grinding
- Univ. of Kentucky, Lexington, KY (United States)
An innovative process has been developed at the University of Kentucky to enhance the liberation of mineral matter from coal and the efficiency of grinding energy utilization. Through treating coal with a swelling agent prior to grinding, the grindability of coals can be considerably improved. The Hardgrove Grindability tests show that the HGI of a KY. No. 9 coal increases from 41 for the untreated coal to 60-90 after swelling pretreatment for a short time. Batch stirred ball mill grinding results demonstrate that this new technique has a great potential in reducing the energy consumption of fine coal grinding. Depending on the pretreatment conditions, the specific energy consumption of producing less than 10 {mu}m product is reduced to 41-60% of that of the untreated coal feed. The production rate of -10 {mu}m particles increases considerably for the pretreated coal. The Energy-Dispersive-X-ray Analytical Scanning Electron Microscope (EDXA-SEM) studies clearly demonstrate that intensive cracking and fracturing were developed during the swelling pretreatment. Cracks and fractures were induced in the coal matrix, preferentially along the boundaries between the pyrite particles and coal matrix. These may be responsible for enhancement in both the efficiency of grinding energy consumption and the selectivity of liberation.
- OSTI ID:
- 45121
- Report Number(s):
- CONF-930413-; TRN: 95:003334-0048
- Resource Relation:
- Conference: 18. international technical conference on coal utilization and fuel systems, Clearwater, FL (United States), 26-29 Apr 1993; Other Information: PBD: 1993; Related Information: Is Part Of Proceedings of the 18th international technical conference on coal utilization & fuel systems; PB: 926 p.
- Country of Publication:
- United States
- Language:
- English
Similar Records
Efficient ultrasonic grinding: a new technology for micron-sized coal. Quarterly technical progress report No. 1, September 15-December 15, 1979
Hardgrove grindability study of Powder River Basin and Appalachian coal components in the blend to a midwestern power station