The effects of advanced physical coal cleaning on mineral matter and ash composition and its relationship to boiler slagging and fouling potential

Conference · Wed Jun 01 04:00:00 EDT 1988 · Am. Chem. Soc., Div. Gas Fuel Chem., Prepr.; (United States)

OSTI ID:6508110

DeMaris, P J; Read, R B; Camp, L R ^[1]

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1. Illinois State Geological Survey, 615 East Peabody Drive, Champaign, IL (US)

Recent progress in cleaning medium to high-sulfur coals from the Illinois Basic by advanced flotation methods (Read et al., 1987a) has led to the need to evaluate changes in the ash fusion temperatures of deep cleaned coal. Because the alumina and silica-rich clay minerals and coarse pyrite are more easily removed during coal cleaning than finely disseminated pyrite, it is believed that deeply cleaned coal products may have lower ash fusion temperatures because of altered composition of the remaining ash. To investigate this question a suite of six coals, cleaned to various degrees, were analyzed for ash chemistry (ASTM method on 750/sup 0/C Ash), ash fusion temperatures, perographic variation and mineralogic composition. The samples include the two major mined seams in the Illinois Basin, the Herrin (No. 6) and Springfield (No. 5) Coal Members, as well as the widely used Pittsburgh seam. In this abbreviated paper results for ash chemistry and ash fusion analysis are reported and evaluated. The coals tested contain a variety of minerals. For a run-of-mine (ROM) or channel sample the typical mineral suite listed in decreasing abundance order is: various clay minerals (kaolinite, illite and expandables), pyrite/marcasite, quartz, calcite and other minerals. As these coals are cleaned certain components are more easily removed, such as the free clay and quartz (largely from floor and roof materials) and coarse pyrite/marcasite and calcite from the coal seam. While some of the mineral matter can be liberated with minimum crushing and removed by gravity separation without significant Btu loss, the finely dispersed (framboidal) pyrite requires extensive grinding to achieve significant liberation levels.

• OSTI ID: 6508110
• Report Number(s): CONF-8806136-
• Conference Information: Journal Name: Am. Chem. Soc., Div. Gas Fuel Chem., Prepr.; (United States) Journal Volume: 33:2
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010300* -- Coal
Lignite
& Peat-- Preparation-- (1987-)
010600 -- Coal
Lignite
& Peat-- Properties & Composition
011000 -- Coal
Lignite
& Peat-- Reserves
Geology
& Exploration
42 ENGINEERING
421000 -- Engineering-- Combustion Systems
AEROSOL WASTES
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM SILICATES
ASHES
BOILERS
CALCITE
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE MINERALS
CARBONATES
CHALCOGENIDES
CHEMICAL COMPOSITION
CLEANING
COAL
COAL DEPOSITS
COAL RANK
COAL SEAMS
ENERGY SOURCES
FEDERAL REGION III
FEDERAL REGION V
FLOTATION
FLY ASH
FOSSIL FUELS
FOULING
FUELS
GEOLOGIC DEPOSITS
ILLINOIS
IRON COMPOUNDS
IRON SULFIDES
KAOLINITE
MATERIALS
MINERAL RESOURCES
MINERALOGY
MINERALS
NORTH AMERICA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PARTICLE SIZE
PENNSYLVANIA
PITTSBURGH
PYRITE
QUARTZ
RESIDUES
RESOURCES
SEPARATION PROCESSES
SILICA
SILICATE MINERALS
SILICATES
SILICON COMPOUNDS
SILICON OXIDES
SIZE
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
SULFUR CONTENT
TRANSITION ELEMENT COMPOUNDS
USA
WASTES