Specialized metallurgical processes – compositions for use therei – Processes – Process control responsive to sensed condition
Patent
1990-12-10
1992-02-25
Andrews, Melvyn J.
Specialized metallurgical processes, compositions for use therei
Processes
Process control responsive to sensed condition
75407, 75412, 75414, 75681, C22B 2106
Patent
active
050909983
ABSTRACT:
The process for purifying a metal melt operates with an active gas introduced into the lower region thereof and consisting of an inert carrier gas and an active, gaseous halogen which are introduced under control into a vessel with the stagnant or flowing metal melt.
The active, gaseous halogen is generated at a controlled rate in at least one gas evolution cell and introduced into the carrier gas. The active gas mixture is passed directly into the metal melt. The gas feed line of the halogen does not have any control element.
The gas evolution cell for generating the halogen is preferably an exchangeable electrolysis cell, gas being produced only when the electrolysis current is switched on, which follows a nominal curve proportionally to the current intensity.
REFERENCES:
patent: 3508908 (1970-04-01), Herwig et al.
patent: 3958980 (1976-05-01), Szekely
patent: 3958981 (1976-05-01), Forberg et al.
patent: 4681152 (1987-07-01), Flowers et al.
G. A. Hampel, "The Encyclopedia of Electrochemistry", 1984, pp. 592-593.
Alusuisse-Lonza Services Ltd.
Andrews Melvyn J.
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