Method for making carbon blocks highly resistant to thermal...

Details Method for making carbon blocks highly resistant to thermal... Method for making carbon blocks highly resistant to thermal...

2005-01-04

2005-01-04

Lechert, Jr., Stephen J. (Department: 1732)

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

C264S037100, C264S037290, C264S069000, C264S115000, C264S118000, C264S122000, C429S231800

Reexamination Certificate

active

06838024

ABSTRACT:
The invention relates to a simplified production process with which it is possible to obtain carbon blocks, in particular anodes intended for aluminium production using the Hall-Héroult electrolysis process, which have high thermal shock resistance. This process comprises a grain size distribution adjustment operation of a carbon aggregate which includes:a) separating an initial ungraded carbon aggregate AC into a first fraction F1made up of grains whose sizes are smaller than X, and into a second fraction F2made up of grains whose sizes are X or greater, X lying between 0.2 and 2 mm;b) crushing B1the first fraction F1and part P1of the second fraction F2such as to obtain a powder F comprising a controlled proportion of ultra-fine grains;c) mixing the remaining part P2of fraction F2and said powder F in proportions with which it is possible to obtain crude carbon blocks whose so-called “Gr/S” ratio between the proportion PGr of grains larger than 0.3 mm and the proportion PS of grains between 30 μm and 0.3 mm in size is at least equal to 4 and baked carbon blocks of high density.

REFERENCES:
patent: 4479913 (1984-10-01), Akerberg et al.
patent: 4775455 (1988-10-01), Chandramouli et al.
patent: 5299745 (1994-04-01), Fischer
patent: 5413689 (1995-05-01), de Nora et al.
patent: 1241597 (1998-08-01), None
patent: 3540169 (1987-05-01), None
patent: 1281604 (1987-01-01), None

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