Development of the Selective Hydrophobic Coagulation process. Seventh quarterly technical progress report, April 1, 1993--June 30, 1993
A novel technique for selectively coagulating and separating coal from dispersed mineral matter has been developed at Virginia Tech. The process, known as Selective Hydrophobic Coagulation (SHC), has been studied under the sponsorship of the US Department of Energy since 1986 (Contracts DE-AC22-86PC91221 and DE-AC22-90PC90174). The SHC process differs from oil agglomeration, shear flocculation, polymer flocculation, and electrolytic coagulation processes in that it does not require reagents or additives to induce the formation of coagula. Often, simple pH control is all that is required to (i) induce the coagulation of coal particles, and (ii) effectively disperse particles of mineral matter. When the coal is superficially oxidized, a small dosage of reagents may be used to promote coagulation. During the quarter, work was completed on the development of the hydrophobic interaction energy function (Subtask 2.1) and the extended DLVO equation (Subtask 2.2.). Work to predict optimum operating conditions using the extended DLVO equation (Subtask 2.3) is underway. In Task 3 -- Process Development, work was completed on the study to determine the effect of mixing on coagula growth (Subtask 3.2) and on the use of column flotation for the recovery of coal coagula (subtask 3.3.4). Work is underway on the use of the lamella thickener and filter for the recovery of coagula (Subtasks 3.3.1 and 3.3.2).
- Research Organization:
- Virginia Center for Coal and Minerals Processing, Blacksburg, VA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC22-91PC91164
- OSTI ID:
- 10191841
- Report Number(s):
- DOE/PC/91164-T7; ON: DE94001972; BR: AA0520000
- Resource Relation:
- Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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Development of the Selective Hydrophobic Coagulation process
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