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Effects of sulfur retention in ash on mass balance calculations

Conference ·
OSTI ID:5947227
;
Comprehensive analyses of 14 coals and coal ash indicates that coal sulfur is selectively retained in the ash during ASTM ash determinations as sulfate depending on the atomic calcium-to-sulfur (Ca:S) ratio. The 14 coals have been extensively used in coal liquefaction research. The coals range in ash content from 3 to 46 wt %, in calcium (Ca) content from 0.3 to 1.8 wt %, and in total sulfur content from 0.52 to 4.22 wt % of mf coal. It was found that both x-ray fluorescence and Leco sulfur techniques gave comparable sulfur contents of ash. Atomic Ca:S ratios from 0.21 to 4.32. Five coals had atomic Ca:S ratios from 0.2 to 0.8 which correlated with their sulfur retentions from 5% to 80% with a correlation coefficient of 0.997. Four coals with Ca:S ratios between 0.8 and 1.5 gave 83% to 89% sulfur retention, while three low-sulfur coals (less than 0.52 wt % mf) and ratios over 2 resulted in 100% retention. A low-Ca bituminous coal resulted in only 5% sulfur retention in ash, while a high-Ca lignitic coal resulted in 74% sulfur retention in ash. The retained sulfur can be partially organic sulfur, since the amount retained may be more than is originally present as sulfate and pyritic sulfur. The effects of sulfur retention in ash on the calculation of the maf coal and the oxygen content of the coal and on liquefaction ash balances is discussed. The results indicate that mass balance calculations which force ash-in to equal ash-out can lead to the introduction of error. 4 references, 11 tables.
Research Organization:
North Dakota Univ., Grand Forks (USA). Energy Research Center; Minnesota Univ., Crookston (USA). Dept. of Chemistry
DOE Contract Number:
FC21-83FE60181
OSTI ID:
5947227
Report Number(s):
DOE/FE/60181-103; CONF-850357-5; ON: DE85008504
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010600* -- Coal
Lignite
& Peat-- Properties & Composition
ALKALINE EARTH METAL COMPOUNDS
ALKALINE EARTH METALS
ASH CONTENT
ASHES
BITUMINOUS COAL
BLACK COAL
BROWN COAL
CALCITE
CALCIUM
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CALCIUM SULFATES
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE MINERALS
CARBONATES
CHALCOGENIDES
CHEMICAL ANALYSIS
CHEMICAL REACTION YIELD
COAL
COAL LIQUEFACTION
DATA
ELEMENTS
ENERGY SOURCES
EXPERIMENTAL DATA
FOSSIL FUELS
FUELS
INFORMATION
IRON COMPOUNDS
IRON SULFIDES
LIGNITE
LIQUEFACTION
MASS BALANCE
MATERIALS
METALS
MINERALS
MOISTURE
NONDESTRUCTIVE ANALYSIS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PYRITE
QUANTITATIVE CHEMICAL ANALYSIS
RESIDUES
SUBBITUMINOUS COAL
SULFATES
SULFIDE MINERALS
SULFIDES
SULFUR
SULFUR COMPOUNDS
SULFUR CONTENT
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
X-RAY EMISSION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS
YIELDS