Method for the conversion of crystalline silica raw materials in

Details Method for the conversion of crystalline silica raw materials in Method for the conversion of crystalline silica raw materials in

1975-04-16

1977-08-09

Tayman, Jr., James H.

Chemistry: physical processes

Physical processes

23277R, 23279, 23286, 423335, 423340, 65134, 65347, 65DIG8, 13 21, 13 25, C03B 526, C03B 502, C01B 3312, B01J 600

Patent

active

040407950

ABSTRACT:
The apparatus is a rotatable resistance heating furnace including a rotatable cylindrical body portion having an interior space in the form of a truncated cone. The base of the truncated cone forms a discharge opening for rapid discharge of the amorphous silica. The furnace is provided with a resistance heating element which extends into the furnace interior through a top opening. In one embodiment a slidable filling tube is provided for charging the furnace during rotation thereof. The process utilizes the above-described apparatus and involves heating the crystalline silica to a temperature sufficient to convert it to the amorphous state, evacuating the furnace during the conversion to draw off by-product gases, and rotating the furnace to a speed sufficient to bring about a separation between the silica charge and the resistance heating element.

REFERENCES:
patent: 2007755 (1935-07-01), Ferguson
patent: 2931708 (1960-04-01), Aamot
patent: 3853520 (1974-12-01), Rau

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