Hydrocarbon-oil encapsulate bubble flotation of fine coal. Technical progress report for the seventh quarter, April 1, 1992--June 30, 1992
This reporting period has been devoted in the study of lyophobic characteristics of six ranks of coals which were selected for the study of hydrocarbon-oil encapsulated bubble flotation of fine coals. Additionally, the coal particle surfaces treated with collector using various collector dispersion techniques are also tested in the film flotation. The experimental techniques and instruments used for the measurement of hydrophobicity and floatability of fine coals include (1) Film flotation, (2) Induction timer, (3) Hallimond cell and (4) stirred tank flotation cell are given. The static float and sink test known as the film flotation process were used to characterize the wetting behaviors of the fine coal surfaces. In this flotation technique, the coal particles were tested on the interface of a series of aqueous methanol solution of different surface tensions. The distributions of lyophobic particles as the function of the wetting surface tensions of the particles were obtained. From the frequency distribution of critical surface tensions, the parameters such as the mean critical surface tension, dispersion and average contact angle for the coal particle surfaces were calculated. These parameters characterized the heterogeneity of the coal particle surfaces and correlated well with the induction time, floatability and flotation response data obtained from Hallimond cell and a stirred tank cell. Furthermore, the frequency distributions of hydrophobic surface sites of the particle surfaces were also derived from the results of film flotation tests. These frequency distributions were extended to interpret and predict the flotation rates and recoveries for the coal samples without treating and coal samples treated with collector using various collector dispersion techniques.
- Research Organization:
- West Virginia Univ., Morgantown, WV (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-90PC90314
- OSTI ID:
- 10109975
- Report Number(s):
- DOE/PC/90314-T3; ON: DE95005505; TRN: 95:001395
- Resource Relation:
- Other Information: PBD: [1995]
- Country of Publication:
- United States
- Language:
- English
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