Mechanisms for selective coalescence of coals

Technical Report · Thu Dec 01 04:00:00 EST 1988

DOI:https://doi.org/10.2172/6919449· OSTI ID:6919449

Wheelock, T D; Markuszewski, R; Fan, C W; Drzymala, J; Allen, R W; Hu, Y C; Tyson, D; Xiaoping, Qiu; Lessa, A

The study of basic mechanisms which underlie various processes for cleaning coal by selective agglomeration with oil was continued. Upper Freeport coal, used extensively in this study, was further characterized by measuring its heat of wetting in dilute salt solutions (CaCl{sub 2}/NaCl/FeCl{sub 3}) range of pH. The effect of mild surface oxidation on the agglomeration characteristics of Lower Kittanning coal was investigated because of the large pyritic sulfur content of this material. Oxidation was performed by exposing a thin layer of the finely ground coal to air at room temperature for 10 days. When the ground material was subsequently agglomerated with heptane, the agglomeration recovery of the oxidized coal was only slightly less than that of unoxidized coal. However, the sulfur content was lower than that of agglomerated coal which had not been oxidized. The effect of pyrite surface properties on the separation of coal/pyrite mixtures was further studied by combining acid-cleaned mineral pyrite with No. 2 gas seam coal from Raleigh Country, West Virginia. The separation was not as good as that obtained previously with mixtures involving mineral pyrite which had been mildly oxidized. 1 ref., 12 figs., 3 tabs.

• Research Organization: Ames Lab., IA (USA)
• Sponsoring Organization: DOE/FE
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 6919449
• Report Number(s): IS-4985; ON: DE90017299
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010300* -- Coal
Lignite
& Peat-- Preparation-- (1987-)
AGGLOMERATION
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALKANES
CALCIUM CHLORIDES
CALCIUM COMPOUNDS
CALCIUM HALIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
COAL
COALESCENCE
DOCUMENT TYPES
ENERGY SOURCES
FOSSIL FUELS
FUELS
HALIDES
HALOGEN COMPOUNDS
HEPTANE
HYDROCARBONS
IRON CHLORIDES
IRON COMPOUNDS
IRON SULFIDES
MATERIALS
MINERALS
ORGANIC COMPOUNDS
OXIDATION
PH VALUE
PROGRESS REPORT
PYRITE
SALINITY
SODIUM CHLORIDES
SODIUM COMPOUNDS
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WETTING HEAT