Some aspects of the structure and reactions of Northern Great Plains lignites

Technical Report · Sat Jan 01 00:00:00 EST 1983

OSTI ID:5954485

Kube, W R; Schobert, H H; Benson, S A; Karner, F R

It has long been recognized that lignites possess unusual properties which can have profound effects on utilization. Such properties include high moisture content, high quantities of oxygen functional groups in the carbon structure, an alkaline ash, and inorganic cations attached to carboxylic-acid groups. The rapid expansion of lignite utilization in recent years has brought with it an increasing realization of the importance of developing a better understanding of the organic and inorganic structures in lignite and of how those structural features influence lignite reactivity or processing behavior. Results are presented from some current studies in progress on lignite structure and reactivity. The average proximate and ultimate analyses of Fort Union lignites are summarized in Table 1, together with average values for a Pittsburgh seam bituminous coal. The important points to note are the much higher moisture content, higher oxygen, and lower heating value of the lignite. Average ash compositions of lignite, bituminous coal, and bark ash are presented in Table 2. Usually, lignite ash contains a much higher proportion of alkali; and alkaline earth elements, and consequently lower proportions of acidic oxides such as silica and alumina, than does ash from bituminous coals. The data on spruce bark ash show the similarity of lignite and woody ashes. 7 figures, 2 tables

• Research Organization: North Dakota Univ., Grand Forks (USA). Dept. of Chemical Engineering; USDOE Grand Forks Energy Technology Center, ND
• OSTI ID: 5954485
• Report Number(s): DOE/FC-1020; CONF-830814-4; ON: DE83009841
• Resource Relation: Conference: 186. national meeting of the American Chemical Society, Washington, DC, USA, 28 Aug 1983
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
ASHES
CHEMICAL COMPOSITION
BITUMINOUS COAL
CALORIFIC VALUE
STRUCTURAL CHEMICAL ANALYSIS
LIGNITE
CARBON
COMPARATIVE EVALUATIONS
DATA COMPILATION
HYDROGEN
MOISTURE
NITROGEN
NORTH DAKOTA
OXYGEN
SULFUR
VOLATILE MATTER
BLACK COAL
BROWN COAL
CARBONACEOUS MATERIALS
COAL
COMBUSTION PROPERTIES
DATA
ELEMENTS
ENERGY SOURCES
FEDERAL REGION VIII
FOSSIL FUELS
FUELS
INFORMATION
MATERIALS
MATTER
NONMETALS
NORTH AMERICA
NUMERICAL DATA
RESIDUES
USA
010600* - Coal
Lignite
& Peat- Properties & Composition