A new approach in ultrapurification of coal by selective flocculation: Quarterly report

Technical Report · Thu Jun 01 04:00:00 EDT 1989

DOI:https://doi.org/10.2172/5885893· OSTI ID:5885893

Moudgil, B. M.

The experimental procedures and results on single and mixed mineral studies of coal/refuse system were outlined in the last quarterly report. In this quarter, single and mixed mineral studies of a coal/pyrite system that also contained a sizeable amount of coal refuse were conducted. Pyrite was observed to be well flocculated by Superfloc 362. Another flocculant, Superfloc 16, also showed excellent flocculating capabilities for pyrite as compared to coal. On the other hand, hydrophobic polymer, WCL-762, was observed to flocculate coal more than pyrite. Mixed mineral studies of 90:10 mixtures of coal/pyrite showed loss of selectivity due to heteroflocculation with Superfloc 362. The increase in settling time at lower dosages of SF 362 did not significantly affect the supernatant coal grade. The effect of pH on the supernatant grade was also studied. No selectivity was achieved in the lower pH range whereas potential separation of coal from pyrite was indicated at higher pH values. In the mathematical simulation of selective flocculation, no significant effect on the simulation results was observed when the number of particles was changed from 100 to 300 particles. It was determined that when the impurity component is flocculated, the selectivity decreases as the amount of impurity in the feed is reduced. 3 refs., 9 figs., 6 tabs.

• Research Organization: Florida Univ., Gainesville, FL (USA). Dept. of Materials Science and Engineering
• DOE Contract Number: FG22-88PC88917
• OSTI ID: 5885893
• Report Number(s): DOE/PC/88917-3; ON: DE89016378
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402* -- Coal
Lignite
& Peat-- Purification & Upgrading
CARBONACEOUS MATERIALS
CHALCOGENIDES
COAL
DOCUMENT TYPES
ENERGY SOURCES
FLOCCULATION
FOSSIL FUELS
FUELS
IRON COMPOUNDS
IRON SULFIDES
MATERIALS
MINERALS
PH VALUE
POLYMERS
PRECIPITATION
PROGRESS REPORT
PURIFICATION
PYRITE
SEPARATION PROCESSES
SPECIFICITY
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS