| US 7,615,172 B2 | ||
| Methods for producing sintered particles from a slurry of an alumina-containing raw material | ||
| Thomas C. Palamara, Eufaula, Ala. (US); and Brett Allen Wilson, Lafayette, La. (US) | ||
| Assigned to Carbo Ceramics, Inc., Houston, Tex. (US) | ||
| Filed on Mar. 01, 2006, as Appl. No. 11/365,230. | ||
| Claims priority of provisional application 60/657528, filed on Mar. 01, 2005. | ||
| Prior Publication US 2006/0219600 A1, Oct. 05, 2006 | ||
| Int. Cl. B28B 11/06 (2006.01); C04B 35/10 (2006.01) | ||
| U.S. Cl. 264—131 [264/652; 264/669; 264/673; 264/681] | 12 Claims |
| 1. A method for producing sintered particles comprising:
preparing a slurry having a solids content of from about 40 to about 60% by weight, and comprising water, a binder, a mullite
growth promoter and a raw material having an alumina content in a range of from about 55 to about 80% by weight;
atomizing the slurry into droplets;
coating seeds comprising alumina with the droplets to form green particles; and
sintering at least a portion of the green particles at a temperature of from about 1000° C. to about 1600° C. for about 5
minutes to about 90 minutes, to form sintered particles having an alumina content of greater than about 55% by weight, an
iron oxide content in a range of from about 2 to about 10% by weight, a specific gravity in a range of from about 2.70 g/cm3 to about 3.50 g/cm3, and a bulk density in a range of from about 1.55 g/cm3 to about 1.95 g/cm3.
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