EP 0455590 B1 19950628 - Regulating and stabilizing the AlF3-content of aluminium electrolysis cells.
Title (en)
Regulating and stabilizing the AlF3-content of aluminium electrolysis cells.
Title (de)
Regulierung und Stabilisierung des A1F3-Gehaltes in einer Aluminiumelektrolysezelle.
Title (fr)
Régulation et stabilisation de la teneur en A1F3 d'une cave d'électrolyse de l'aluminium.
Publication
Application
Priority
CH 152790 A 19900504
Abstract (en)
[origin: CA2041440A1] A method is used for regulating and stabilising an AlF3 content (c), which is at least about 10% by weight, in the bath of an electrolysis cell for the production of aluminium from alumina dissolved in a cryolite melt. The individual state of an aluminium electrolysis cell, in particular of the cathodic carbon sump thereof, is analysed for a period (t1) from a series of measured values, comprising a plurality of parameters. By means of a model calculation, the optimum time delay (ZV) between the addition of AlF3 and its effect in the electrolyte is determined. The additions (z) of AlF3 are calculated for a preset defined AlF3 content (c) allowing for the time delay (ZV), and AlF3 is added in portions or continuously.
IPC 1-7
IPC 8 full level
C25C 3/20 (2006.01)
CPC (source: EP US)
C25C 3/20 (2013.01 - EP US)
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
EP 0455590 A1 19911106; EP 0455590 B1 19950628; AU 643006 B2 19931104; AU 7601591 A 19911107; CA 2041440 A1 19911105; DE 59105830 D1 19950803; ES 2075401 T3 19951001; IS 1632 B 19960719; IS 3698 A7 19911105; NO 304748 B1 19990208; NO 911708 D0 19910430; NO 911708 L 19911105; US 5094728 A 19920310; ZA 913260 B 19920129
DOCDB simple family (application)
EP 91810305 A 19910424; AU 7601591 A 19910429; CA 2041440 A 19910429; DE 59105830 T 19910424; ES 91810305 T 19910424; IS 3698 A 19910502; NO 911708 A 19910430; US 69393991 A 19910429; ZA 913260 A 19910430