Improved sulfur removal from coals by redox potential control of surfaces during grinding

Conference · Fri Jan 01 00:00:00 EST 1988 · Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States)

OSTI ID:5871673

Tampy, G K; Birlingmair, D H; Burkhart, L E

Control of the redox potential of an Upper Freeport run-of-mine coal slurry during wet grinding and subsequent beneficiation gave better sulfur removal, with no decrease in coal recovery, than either potential control during grinding or beneficiation alone. Sodium dithionite, a reducing agent used to depress the sulfur, also gave substantially better results than pH control alone, irrespective of whether the physical beneficiation was by oil agglomeration, foam flotation, or microbubble batch flotation. Three-phase contact angle measurements and pulp potential measurements suggest that slow electrochemical reactions at the particle surfaces may be responsible for the improved results obtained when the reductant is added at the grinding stage.

• Research Organization: Iowa State Univ., Ames (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5871673
• Report Number(s): CONF-8809271-
• Journal Information: Prepr. Pap., Am. Chem. Soc., Div. Fuel Chem.; (United States), Vol. 33:4; Conference: Surface chemistry of coal, Los Angeles, CA, USA, 25-30 Sep 1988
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
BITUMINOUS COAL
DESULFURIZATION
ADDITIVES
AGGLOMERATION
ASH CONTENT
CALORIFIC VALUE
CHEMICAL PROPERTIES
COAL PREPARATION
COMMINUTION
CONTROL
EFFICIENCY
FLOTATION
HARDNESS
MOISTURE
ORGANIC SULFUR COMPOUNDS
PH VALUE
PYRITE
REDOX POTENTIAL
SODIUM COMPOUNDS
SULFATES
SULFUR CONTENT
SURFACE PROPERTIES
ALKALI METAL COMPOUNDS
BLACK COAL
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION PROPERTIES
ENERGY SOURCES
FOSSIL FUELS
FUELS
IRON COMPOUNDS
IRON SULFIDES
MATERIALS
MECHANICAL PROPERTIES
MINERALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
SEPARATION PROCESSES
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
010300* - Coal
Lignite
& Peat- Preparation- (1987-)