Effect of oxidation on separation of coal and pyrite by selective oil agglomeration
The separation of coal and pyrite particles by selective agglomeration with oil can be troublesome for coals which are weakly hydrophobic or hydrophilic and, therefore, are not strongly agglomerable. The hydrophobicity of lower rank coals and other coals which have become oxidized is generally low. The problem of separating such coals from pyrite was studied by oxidizing a moderately hydrophobic coal with air at 150{degrees}C for either 8, 20, or 72 hr to systematically reduce its hydrophobicity. Samples of the raw and treated coal were subsequently mixed with aged mineral pyrite from Peru and agglomerated with heptone. Although a mixture of the raw, unoxidized coal and pyrite was largely separated by this method, it proved increasingly difficult to separate the materials as the coal became increasingly oxidized. While raw coal was agglomerated in preference to pyrite, this preference changed as the coal was oxidized. After 20 hr. of oxidation, coal and pyrite were agglomerated almost to the same extent. Finally after 72 hr. of oxidation, more pyrite was agglomerated than coal.
- Research Organization:
- Ames Lab., IA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 10156485
- Report Number(s):
- IS-M-710; CONF-920808-1; ON: DE92016300
- Resource Relation:
- Conference: American Institute of Chemical Engineers (AIChE) summer national meeting,Minneapolis, MN (United States),9-12 Aug 1992; Other Information: PBD: [1992]
- Country of Publication:
- United States
- Language:
- English
Similar Records
Agglomeration characteristics of hydrophilic coals and pyrite/coal mixtures
Mechanisms for selective coalescence of coals: Fossil Energy quarterly report, April 1, 1987-June 30, 1987. [Zeta potential]