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Title:
単一炉を使用し、炉内温度制御による炭素熱還元方法
Document Type and Number:
Japanese Patent JP2008511760
Kind Code:
A
Abstract:
A start-up process of making aluminum using a single carbothermic reactor/furnace ( 11 ) having a single hollow reactor compartment with bottom resistance heating electrodes ( 16 ) ( 13 ) in the side of the reactor, involves adding Al2O3 and C (carbon) for start-up and melting the mixture to provide a (Al2O3-Al4C3) slag having a temperature between about 1875° C. and 2000° C.; and then adding Al4C3 to the slag and raising the temperature of the furnace ( 11 ) to form a top Al phase with 6 to 8 wt % C ( 21 ) and a bottom slag phase ( 22 ); and then adding Al2O3 is added to the Al-C/slag ( 21, 22 ) to produce an Al2O3 rich slag lower the reactant temperature and produce a decarbonization reaction (step 30 ) providing a top Al phase with less than 5 wt % C ( 23 ) which is then tapped after step ( 40 ). The remaining slag is the starting material.

Inventors:
Flueuhan, Richard Jay.
Application Number:
JP2007530444A
Publication Date:
April 17, 2008
Filing Date:
September 01, 2005
Export Citation:
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Assignee:
Alcoa Incorporated
International Classes:
C22B21/02; C22B4/02; C22B5/10; F27B17/00; F27D11/02
Domestic Patent References:
JPS5693833A1981-07-29
JP2002534602A2002-10-15
Attorney, Agent or Firm:
Toshiyuki Maruyama
Takao Miyano
Koichi Kitazumi
Toshiya Nagatsuka
Takahiro Kutoku