Electrolysis: processes – compositions used therein – and methods – Electrolytic synthesis – Utilizing fused bath
Reexamination Certificate
2005-05-04
2008-05-27
Bell, Bruce F. (Department: 1795)
Electrolysis: processes, compositions used therein, and methods
Electrolytic synthesis
Utilizing fused bath
C205S389000, C205S335000, C205S336000, C205S337000, C205S375000, C205S372000
Reexamination Certificate
active
07378009
ABSTRACT:
A method of controlling an aluminum reduction cell including the following steps:maintaining alumina concentration within preset limits by alternating base, underfeed and overfeed modes; measuring cell voltage and potline amperage; calculating current normalized voltage value and a rate of changing thereof in time; comparing the calculated values of the normalized voltage with preset values thereof and correcting anode-cathode distance when passing from the base mode to the overfeed or underfeed modes; and measuring a number of alumina feed doses in the underfeed mode and overfeed mode over a time period sufficient for the alumina to dissolve.
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patent: 2113552 (1998-06-01), None
patent: 2189403 (2002-09-01), None
(1) Robilliard and Rolofs, A Demand Feed Strategy For Aluminum Electrolysis Cells, Granges Aluminum Metall AB, Sundsvall, Sweden, published in Light Metals 1989, The Minerals, Metals, & Materials Society, p. 269-273.
Berezin Alexander I.
Buzunov Victor Y.
Rodnov Oleg O.
Svoevskiy Alexey V.
Bell Bruce F.
Fridman Lawrence G.
Russian Engineering Company, LLC
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