Drying and gas or vapor contact with solids – Process – By centrifugal force
Reexamination Certificate
2006-02-07
2006-02-07
Lu, Jiping (Department: 3749)
Drying and gas or vapor contact with solids
Process
By centrifugal force
C034S315000, C075S484000, C075S485000
Reexamination Certificate
active
06993855
ABSTRACT:
The present invention provides: a method for drying compacts containing water so as not to cause explosion and powdering; a method for reducing the compacts after being dried with great efficiency in a rotary-hearth-type reducing furnace; and a rotary-hearth-type metal reducing furnace. In the present invention, when compacts comprising powder containing metal oxide and carbon are dried, the critical value of a water evaporation rate, beyond which explosion occurs, is determined from the size and porosity of the compacts, then the water evaporation rate is controlled to a value not exceeding the critical value and, by so doing, the increase in the internal pressure of the compacts caused by the generation of water vapor is prevented. By the method, the explosion and cracking of the compacts are prevented. Further, when compacts are dried in a rotary-hearth-type reducing furnace, explosion is prevented by controlling the heat supply rate to the compacts through the above method and successively the compacts are incinerated and reduced in the same furnace.
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Abe Yoichi
Ibaraki Tetsuharu
Nagai Kazunori
Takahashi Shigeki
Yamamoto Takashi
Kenyon & Kenyon
Lu Jiping
Nippon Steel Corporation
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