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Comparison of inorganics in three low-rank coals

Technical Report ·
OSTI ID:6519059
;
Three coals, two lignites from the Beulah mine, North Dakota, and the Bryan mine, Texas and one subbituminous coal from the Rosebud mine, Montana, were analyzed for inorganic materials. A flowsheet is presented to show the procedure used. Each coal was ground to approximately 400 mesh in an alumina grinding apparatus. The ground coal was dried using a freeze drier. Analysis of the dried coal was performed using x-ray fluorescence (XRF) and neutron activation analysis (NAA). Duplicate samples were run by placing 15 to 20 g of coal in a plastic beaker with 100 ml of 1M ammonium acetate. This was heated to about 70/sup 0/C and stirred for 20 hours. The sample was filtered, the residue washed and dried. The solution was transferred to a 500 ml volumetric flask and made up to volume. The solution was analyzed by inductively coupled argon plasma spectroscopy (ICAP). Samples of the residue were analyzed by XRF and NAA. The residue was treated a second time with ammonium acetate followed by two 1M hydrochloric acid extractions using the same procedure as ammonium acetate extraction. The alkaline and alkaline earth metals in all three coals are partially or totally removed with ammonium acetate extraction. The major differences between the coals are: (1) 48% of the total inorganics of the Beulah are removed with ammonium acetate by far the highest of 3 coals. (2) Bryan Texas lignite consists of mostly extraneous mineral matter including clays and quartz minerals. (3) Rosebud subbtuminous has higher percentages of Mg, Ca, and Sr associated as carbonates, revealed in the HCl extractions. 1 figure, 3 tables.
Research Organization:
Department of Energy, Grand Forks, ND (USA). Grand Forks Energy Technology Center; Minnesota Univ., Crookston (USA)
OSTI ID:
6519059
Report Number(s):
DOE/FC-1003; CONF-830303-3; ON: DE83001283
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101 -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
400103 -- Radiometric & Radiochemical Procedures-- (-1987)
ACETATES
ACTIVATION ANALYSIS
ALKALI METALS
ALKALINE EARTH METALS
ALUMINIUM
AMMONIUM COMPOUNDS
ASHES
BARIUM
BARYON REACTIONS
BROWN COAL
CALCIUM
CARBONACEOUS MATERIALS
CARBOXYLIC ACID SALTS
CHEMICAL ANALYSIS
CHROMIUM
COAL
COMPARATIVE EVALUATIONS
COPPER
DATA
DIAGRAMS
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FLOWSHEETS
FOSSIL FUELS
FUELS
HADRON REACTIONS
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
IRON
LIGNITE
MAGNESIUM
MANGANESE
MATERIALS
METALS
NEUTRON REACTIONS
NICKEL
NONDESTRUCTIVE ANALYSIS
NUCLEAR REACTIONS
NUCLEON REACTIONS
NUMERICAL DATA
POTASSIUM
QUANTITATIVE CHEMICAL ANALYSIS
RESIDUES
SODIUM
STRONTIUM
SUBBITUMINOUS COAL
TITANIUM
TRANSITION ELEMENTS
X-RAY EMISSION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS