"The principal source of raw material for the production of high-alumina refractories are the diaspore clays of Missouri. These highly refractory clays contain a large percentage of the mineral, diaspore, a monohydrate of alumina whose theoretical chemical formula is Al₂O₃ʺH₂O. The clays as mined contain from 85 to 65 per cent alumina...Diaspore clays as now found fill sandstone-lined "sink holes" or depressions in the parts of the district underlain by rocks of the Pennsylvanian Age. They are rough open-textured clays, grey or buff in color usually, containing the mineral diaspore in the form of shot-like particles or "oolites." There are available, however, large deposits of clays known as "burley" clay. The name is derived from the "burls" or "oolites," which are characteristic of this type of clay. "Burley" clays contain 56-68 per cent Al₂O₃ in contrast to the 78 percent plus Al₂O₃ of the diaspore clays. This work was undertaken in an effort to determine a feasible treatment of these "burley" clays to produce a material in which the alumina content would compare favorably with that of a high-grade diaspore clay"--Introduction, page 1-2.
Herold, Paul G.
Materials Science and Engineering
M.S. in Ceramic Engineering
Missouri School of Mines and Metallurgy
iii, 28 pages
© 1942 Leonard Stearns, All rights reserved.
Thesis - Open Access
Aluminum oxide industry
Diaspore clay -- Missouri
Oolite -- Missouri
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Link to Catalog Record
Stearns, Leonard, "A high alumina concentrate from low-grade burley clay" (1942). Masters Theses. 4953.