Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – By mechanically introducing gas into material
Patent
1980-06-25
1981-10-27
Parrish, John A.
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
By mechanically introducing gas into material
264148, 2643281, 264335, C04B 3514
Patent
active
042973090
ABSTRACT:
Amorphous silica particulates, known as fume silica, which are generally spherical and of small particle sizes, are recovered from the stack gases issuing from an electric furnace producing silicon metal by the reduction of silica with carbon, and these fume silica particles are mixed with up to 40% water to produce a fume amorphous silica green product which is a plastic which may be compacted, such as being extruded, to produce batts or pellets or other shapes. The batts or pellets are sealed in plastic film or in cans and shipped or stored. The batts or pellets are subsequently shaped to prescribed shapes under pressure, dried and, at times, fired. The particulate amorphous silica and water material is, at times, compacted, dried and then shipped or stored. Such dried material is crushed and partially pulverized either before shipment or at the point of use and reconstituted by the addition of water. The fume silica is also mixed with water and a consumable filler or foaming agent and fired to produce a cellular product. The various products are machinable both before and after firing. A mixture of the fume silica and water does not settle out on standing or vibrating and is combined with colloidal silica and dried and ground silica for producing an adhesive silica product suitable as a refractory cement, a refractory facing plaster, a refractory joining mortar or as a slurry for a dip coat for a ceramic shell foundry mold or a shell for investment casting.
REFERENCES:
patent: 2047457 (1936-07-01), Benner
patent: 3163688 (1964-12-01), Lindenthal
patent: 3873658 (1975-03-01), Milholen
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