Coal cleaning by froth flotation
A number of experiments were conducted to determine the flotation characteristics of Iowa coals in which various conditions were applied to study the effect of different parameters such as frother dosage, oily collectors, pyrite depressants, and various combinations of these reagents. Flotation tests were also conducted with Appalachian coals for comparison. Iowa coals did not respond as well to froth flotation as Appalachian coals. Although Iowa coal floated very flowly and incompletely with only a frother (methyl isobutyl carbinol or MIBC), it floated rapidly when a large dosage of an oily collector (No. 200 LLS fuel oil) was employed in addition. No. 1 fuel oil was not nearly as effective as a collector for this application. The order of addition of flotation reagents appeared very important for achieving a high recovery of Iowa coal. Appalachian coals floated rapidly with only a frother or an alkaline solution. A small amount of an oily collector increased the recovery of Appalachian coals significantly. The results of these flotation experiments showed that little mineral matter was removed when a high recovery was achieved. The use of ultrasonics did seem to improve mineral matter liberation. Bubble-particle attachment was studied from a theoretical view point. This study showed that the mechanism of attachment differs depending on the relative size of bubbles and particles. The study indicated that micro-bubbles could separate mineral matter from low rank coal more selectively than macro-bubbles could. A general kinetic model was proposed to represent the rate of flotation of coal. For two Appalachian coals, the model successfully represented the flotation kinetics of uniformly sized coal and for coal consisting of two sizes of particles. 115 references, 33 figures, 34 tables.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6006864
- Report Number(s):
- IS-T-1091; ON: DE85005624
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
013000* -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
BUBBLES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CLEANING
COAL
DATA
ENERGY SOURCES
EXPERIMENTAL DATA
FLOTATION
FOSSIL FUELS
FUELS
INFORMATION
IRON COMPOUNDS
IRON SULFIDES
KINETICS
MATERIALS
MATHEMATICAL MODELS
MINERALS
NUMERICAL DATA
PARTICLE SIZE
PYRITE
REAGENTS
REMOVAL
SEPARATION PROCESSES
SIZE
SOUND WAVES
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ULTRASONIC WAVES