Controlling AlF.sub.3 addition to Al reduction cell electrolyte

Details Controlling AlF.sub.3 addition to Al reduction cell electrolyte Controlling AlF.sub.3 addition to Al reduction cell electrolyte

1986-03-17

1987-05-26

Williams, Howard S.

Chemistry: electrical and wave energy

Processes and products

C25C 306, C25C 320

Patent

active

046683500

ABSTRACT:
A method for controlling the rate of aluminum fluoride addition to a cryolite-based electrolyte of an aluminum electrolytic reduction cell makes use of the known ratio between cell temperature and bath (NaF:AlF.sub.3) ratio. A target temperature is established corresponding to a target bath ratio. The cell temperature is measured at intervals and the rate of AlF.sub.3 addition altered depending on whether the measured temperature is above or below the target temperature. The method is faster than traditional methods involving analysis of electrolyte samples, and is amendable to computer control.

REFERENCES:
patent: 4045308 (1977-08-01), White et al.
patent: 4377452 (1983-03-01), Casdas

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