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Process-oriented analysis of the behavior of coal minerals at elevated temperatures

Author
Lindsay, C. G.
Published
United States : [publisher not identified], 1984
Springfield, Va.: National Technical Information Service, [approximately 1984]
Physical Description
microfiche : negative ; 11 x 15 cm

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Summary
High-temperature behavior of minerals occurring in coal is of interest because the minerals in coal have been identified as the cause of most of the troublesome aspects of coal utilization. Six minerals, quartz, calcite, pyrite, kaolinite, illite, and montmorillonite, commonly associated with bituminous coals, were selected for analysis under the heating-stage microscope. The minerals were heated individually (except quartz), in pairs, and in triplets. Two arrangements of triplet assemblages were used; in one, all three species were in mutual contact, and in the other, a clay band separated two non-clay minerals. Quartz was found to be inert in all heating experiments. Calcite and pyrite, after transforming to lime and pyrrhotite respectively, interacted at about 1100/sup 0/C; oldhamite (CaS) was identified as a product. No other significant mineral-pair interactions were observed. In triplet mounts where pyrite, calcite, and a clay mineral were in mutual contact, interactions between pyrite and calcite were induced at lower temperatures. Supporting experimentation indicated that in these mounts, iron from pyrite migrated into the clay region as the pyrite decomposes. The resulting enhancement in sulfur concentration in the pyrrhotite is considered to be responsible for reduction in the interaction temperature. Studies were made of low-temperature ash suites isolated from coals; some similarities were noted between the thermal behaviors of the ash suites and the laboratory mineral specimens. Comparison with previous studies indicates that the behavior of minerals in their original form is significantly different from the behavior of boiler deposits. 89 references, 16 figures, 7 tables.
Report Numbers
DE85005120; IS-T-1096
Other Subject(s)
Collection
NTIS collection.
Note
DOE contract number: W-7405-ENG-82
OSTI Identifier 6181522
Research organization: Ames Lab., IA (USA).
View MARC record | catkey: 47348920