Process for extracting zinc present in liquid cast iron, means for the implementation of the process, and products thus obtained
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United States of America Patent
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Feb 7, 1995
Grant Date -
N/A
app pub date -
Sep 17, 1993
filing date -
Oct 9, 1990
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Abstract
The invention relates to the field of metallurgy and to a method and a device for the extraction of zinc in solution in a liquid iron bath (2) held in a container (3), such as a crucible for the casting of foundry parts. It is characterized in that, before utilizing the bath for the casting of parts, in a first phase, the gas volume (7) situated in the container (3) is sealingly confined in the east iron bath (2) and, in a second phase, a variable partial vacuum is created in the confined atmosphere in a controlled way in order to constantly adjust it to a predetermined value as a function of the time evolution of the pressure of vapor saturating zinc in solution in the melt at the bath temperature; and said zinc is trapped.
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