“The geochemistry and mineralogy of four flint clay deposits (Pennsylvanian, Cheltenham Formation) in Gasconade County, Missouri, were investigated relative to their refractory behavior. Forty-five core drill samples, characterized mineralogically by XRD and SEM-EDS analysis, and geochemically by ICP, total organic carbon (TOC) analysis and free iron analysis, were compared to standard refractory tests performed on the same samples by A. P. Green Industries Inc., Mexico, Missouri.
Clay minerals include kaolinite with minor illite, illite/smectite mixed layer, a cookeite like mineral (Li Al4 (AI,Si)4 O10 OH8) and boehmite. In the non-clay fraction, previously unreported phosphate minerals francolite (Ca5(PO4, CO3)3F), variscite (AIPO4·2H2O) and wavellite (Al, (OH)3 (PO4)2 · 5H2O) were identified. Other non-clay minerals include quartz, pyrite and the previously reported phosphate mineral gorceixite-goyazite ((Ba, Sr, Ca, Ce) Al3 (PO4)2 (OH)5·H2O (?)).
Geochemical analysis indicate trace amounts of copper, nickel, yttrium, vanadium and zirconium in unusually high concentrations. TOC contents show values from 0.01 to 0.67% in white to black samples respectively. Free iron values are generally low and show a maximum concentration of 35 ppm.
Phosphorous and calcium in phosphate minerals produce “alkali” effects, lowers refractoriness, and has variable effects on the firing properties. Potassium, in illite and illite/smectite, seems to lower the fired grain density while TOC content does not. Lithium in cookeite does not lower the pyrometric cone equivalent as proposed previously”--Abstract, page iii.
Gregg, Jay M.
Moore, Robert E., 1930-2003
Geosciences and Geological and Petroleum Engineering
M.S. in Geology and Geophysics
University of Missouri--Rolla
xiii, 149 pages
East Central Missouri
© 1992 David John Keller, All rights reserved.
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Keller, David John, "Mineralogy and geochemistry of carbonaceous flint clays in east central Missouri" (1992). Masters Theses. 1155.
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