Method of producing a high purity aluminum-lithium mother alloy

Details Method of producing a high purity aluminum-lithium mother alloy Method of producing a high purity aluminum-lithium mother alloy

1988-04-05

1989-02-28

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

204284, 204290R, 204292, C25C 336

Patent

active

048082830

ABSTRACT:
A method of producing high purity aluminum-lithium mother alloys essentially free from sodium, potassium and calcium, which comprises electrolyzing mixed molten salts consisting essentially of lithium chloride and potassium chloride preferably under a cathodic current density in the range of 0.005 to 1 A/cm.sup.2, using one or more hollow cylindrical solid aluminum cathodes, and thereby producing an aluminum-lithium alloy on the cathodes. In the method, the mixed molten salts may be composed essentially of 34 to 64 wt. % of lithium chloride and 66 to 36 wt. % of potassium chloride, and, optionally, 1 to 20 wt. % of sodium chloride based on a combined weight of the aforesaid two components. Preferably, throughout the electrolysis, the potential difference between the cathode and a two-phase (.alpha.+.beta.) aluminum-lithium alloy reference electrode is continuously measured and differentiated with respect to time and at the point of a sudden change in the differentiated value, the electrolysis is stopped.

REFERENCES:
patent: 2507096 (1950-05-01), Dittmer
patent: 3607413 (1971-09-01), Buzzelli
patent: 4521284 (1985-06-01), Tanabe et al.
Journal of the Electrochemical Society, vol. 128, No. 12, Dec. 1981, pp. 2703-2705.
Chem. Zentralblatt, No. 43 (1957) p. 11999.

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