Specialized metallurgical processes – compositions for use therei – Processes – Free metal or alloy reductant contains magnesium
Patent
1990-11-05
1992-01-14
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Free metal or alloy reductant contains magnesium
75680, 75683, 266217, C22B 2100
Patent
active
050807153
ABSTRACT:
A process is described for removing all reinforcing particles contained in metal matrix composite scrap materials. This new technique involves providing a treatment vessel for holding a melt of an aluminum matrix composite to be recycled. Heating means are provided for heating the contents of the vessel to a temperature in the range of 700.degree.-750.degree. C. Mixing of the melt is carried out by means of a power driven vaned rotary impeller and this impeller is operated under different conditions for different stages of the process. In the first mixing stage, the impeller is operated under vortex-forming conditions and a fluxing salt is added to the melt while a gas is injected through a gas outlet beneath the surface of the melt and near the rotating impeller. This causes the salt to rapidly mix with the melt and the inlet gas, providing a uniform distribution through the melt of gas bubbles each surrounded by a layer of liquid salt. As a second stage of the treatment process, the impeller is operated at a high differential velocity between the impeller and the melt. These conditions cause collisions between the salt-coated bubbles and wetted reinforcing particles such as to de-wet the reinforcing particles and cause the reinforcing particles and salt flux to rise to the surface of the melt. The surface layer that is formed is essentially a powder which can easily be removed leaving a substantially pure metal with its chemical composition unchanged.
REFERENCES:
patent: 4191559 (1980-03-01), Van Linden
patent: 4470846 (1984-09-01), Dube
patent: 4775319 (1988-09-01), Otsuka
Provencher Robert
Riverin Gaston
Alcan International Limited
Rosenberg Peter D.
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