Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1991-08-12
1993-07-27
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
264 63, 501155, C04B 3564
Patent
active
052308456
ABSTRACT:
The invention provides a process for producing a ceramic product for use as a construction material. According to the process of the invention, 2 to 50% by weight, based on the total weight, of sludge ashes containing 0.3 to 0.8 mole of CaO in Seger formula, 0.1 to 0.5 mole of MgO in Seger formula, and 0.2 mole or more of P.sub.2 O.sub.5 in Seger formula is added to a ceramic raw material. A desired percentage can be selected from the range of 2 to 50% to produce a ceramic product with desired properties. Also, according to the invention, a molded body can be fired at a temperature lower than a temperature used to fire a molded body with no sludge ashes to produce a ceramic product which is comparable to a ceramic product produced by firing the latter molded body. That is, according to the invention, a molded body can be fired at a temperature of 900.degree. to 1,200 .degree. C. to produce such a ceramic product.
REFERENCES:
patent: 4874153 (1989-10-01), Hashimoto
Parmelee Cullen W. Ceramic Glazes, Industrial Publications Inc., Chicago Ill., 1951, pp. vi, vii, viii, ix, 38-53.
Hashimoto Ryusuke
Iwase Minoru
Derrington James
Fujimi Ceramic Co., Ltd.
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