Method of producing high purity zirconia powder from zircon powd

Details Method of producing high purity zirconia powder from zircon powd Method of producing high purity zirconia powder from zircon powd

1986-10-01

1988-07-05

Stoll, Robert L.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Group ivb metal

423325, 423608, C01G 2502

Patent

active

047553650

ABSTRACT:
In producing zirconia powder by desiliconizing heat treatment of a mixture of zircon powder and a powdery carbon-containing material, optionally with addition of a zirconia stabilizing oxide such as calcia or yttria, in a nonoxidizing atmosphere the conversion of silica into SiO and dissipation of gaseous SiO are promoted and completed by performing the heat treatment under reduced pressure, viz. at a pressure not higher than 0.6 atm. Zirconia powder of very high purity can surely be obtained, even when a large batch of the raw material mixture is treated, by performing the reduced pressure desiliconizing heat treatment in two stages: first at 1200.degree.-1550.degree. C. until almost complete conversion of silica to SiO and then at 1550.degree.-2000.degree. C. The mole ratio of C to SiO.sub.2 in the raw material mixture must be 0.4-2.0. For further enhancement of purity, zirconia powder obtained by the desiliconizing treatment may be subjected to oxidation heat treatment. Efficiency of the desiliconizing heat treatment can be enhanced by precedingly forming the raw material mixture into porous lump(s) whose bulk density is in the range from 0.7 to 2.0.

REFERENCES:
patent: 2072889 (1937-03-01), Kinzie et al.
patent: 3849532 (1974-11-01), Deneke et al.
patent: 4118464 (1978-10-01), Cutler
Patent Abstracts of Japan, vol. 7, No. 86 (Showa Denka K.K.) 28-01-1983.
Patent Abstracts of Japan, vol. 7, No. 77 (Showa Denka K.K.) 20-01-1983.

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