Process for making clay spheroids
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United States of America Patent
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Mar 4, 2003
Grant Date -
N/A
app pub date -
Oct 3, 2000
filing date -
Oct 3, 2000
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A process of making ceramic spheroids by firing clay spheroids comprising by weight percent: FeO (3.22-5.21), Fe.sub.3 O.sub.4 (3.40-5.11), SiO.sub.2 (52.49-59.42), CaO (1.99-7.96), MgO (2.81-4.69), Al.sub.2 O.sub.3 (12.05-17.65), TlO.sub.2 (0.58-0.71), MnO (0.07-0.19), Na.sub.2 O (0.47-0.86), K.sub.2 O (1.70-2.37), P.sub.2 O.sub.3 (0.13-0.19), S (0.03-0.29), CO.sub.2 (0.90-8.23), Organic C (0.22-1.04), H.sub.2 O+ (4.14-7.28), H.sub.2 O- (2.12-5.48) in contact with a particulate parting agent selected from aluminum oxide, magnesium oxide, and their precursors at a sufficiently high temperature and for a sufficiently long time to form a shell. Preferably, the clay spheroids are obtained from a deposit located at Hallock in Kittson County Minn., U.S.A.
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