Bibliographic Citation
| Document |  789 K |
|---|---|
| DOI | 10.2172/10179007 |
| Title | Pyrite surface characterization and control for advanced fine coal desulfurization technologies. Seventh quarterly technical progress report, March 1, 1992--May 31, 1992 |
| Creator/Author | Wang, Xiang-Huai ; Leonard, J.W. ; Parekh, B.K. ; Jiang, Chengliang ; Raichur, A.M. |
| Publication Date | 1992 Jul 14 |
| OSTI Identifier | OSTI ID: 10179007; Legacy ID: DE92040526 |
| Report Number(s) | DOE/PC/90295--T7 |
| DOE Contract Number | FG22-90PC90295 |
| Other Number(s) | Other: ON: DE92040526 |
| Resource Type | Technical Report |
| Specific Type | Numerical Data; Progress Report |
| Coverage | Quarterly |
| Resource Relation | Other Information: PBD: 14 Jul 1992 |
| Research Org | Kentucky Univ., Lexington, KY (United States) |
| Sponsoring Org | USDOE, Washington, DC (United States) |
| Subject | 01 COAL, LIGNITE, AND PEAT; COAL PREPARATION; FLOTATION; REAGENTS; PH VALUE; PROGRESS REPORT; EXPERIMENTAL DATA; PYRITE; REMOVAL; FUEL OILS; ORES |
| Description/Abstract | The objective of this project is to conduct extensive studies on the surface reactivity and surface hydrophobicity of coal-pyrites using various surface characterization techniques and to correlate the alteration of the coal-pyrite surface with the efficiency of pyrite rejection in coal flotation. The flotation characteristics of coal-pyrites under various conditions was studied and compared with ore-pyrite and coal to determine the causes of pyrite rejection difficulties in coal flotation. Both the native and induced floatabilities of pyrites were investigated. It was found that both coal- and ore-pyrites, ff prepared by dry-grinding, show little or no floatability in the absence of any chemical reagents. After ultrasonic pretreatment, ore-pyrite floats effectively in the acidic to neutral pH range. Kentucky No. 9 coal-pyrite (KYPY) shows significant flotation in the pH range 7--10. With ethyl xanthate as collector, ore-pyrite floats well up to pH = 10; while coal-pyrite reveals no flotation above pH = 6. For the first time, the effect of coal collector on the floatability of coal-pyrite has been studied. It was shown that in the presence of fuel oil--a widely used collector for promoting coal flotation, coal-pyrite, particularly for the fine sizes, shows good flotation below pH = 11, whereas ore-pyrite has no or little floatability. These studies demonstrate that one of the main causes of the coal-pyrite flotation in coal separation is the oil-induced floatability due to adsorption/attachment of oil droplets on the coal-pyrite surfaces, the ``native`` or ``self-induced`` floatability of pyrite is no as profound as the oil-induced flotation. |
| Country of Publication | United States |
| Language | English |
| Format | Size: 16 p. |
| Availability | OSTI; NTIS; GPO Dep. |
| System Entry Date | 2008 Jun 19 |
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Last Updated: 02/08/2009