High-temperature interactions among minerals occurring in coal.
Paper 10 in Mineral Matter & Ash in Coal ACS Symp Ser 1986; :128-137
Minerals known to be present in the low-temperature ash extracted from coals were heated in a microscope heating stage from 25 to about 1,400 deg c. Mineral types were arranged in homogeneous fields where two fields shared a linear boundary or three fields were in contact at a point. Because of the known reactivity of calcite and pyrite, all specimens contained this pair. Clay minerals, kaolinite, illite, and montmorillonite were used as the third component. Reaction temperature between calcite and pyrite is lowered by the presence of clays. Iron was observed to migrate into the clay domain after the formation of pyrrhotite from pyrite, and oldhamite was observed forming between the domain of lime formed from calcite and the pyrrhotite. Research was done at Iowa state University under Grant G1106002.
Mineral-deposits; Minerals; Mineral-dusts; Coal-mining; Coal-processing
OP; Final Contract Report
Mineral Matter & Ash in Coal, ACS Symposium Series 301, 1986, PP. 128-137
Iowa State University