Delachaux S.a.

Philippe Liebaert

In the method of producing metals or metal alloys of high purity, in particular metallic chromium, granules of metal containing non-metallic inclusions and a reducing agent are treated under predetermined conditions of temperature and pressure so that the reducing agent reacts on the inclusions. During the treatment, the granules () are placed in a crucible () having an opening (), and a wall () presenting at least one orifice ().

Reductive method for production of metallic elements such as chrome using a crucible with a perforated wall

The invention relates to a method of producing granules made of high purity metal or metal alloy, in particular based on chromium, the method being characterized in that it comprises the steps consisting in: preparing a metal or a metal alloy having non-metallic inclusions essentially comprising oxides of the base metal; pelletizing the metal or the alloy with a reducing agent in order to form the pellets or tablets; treating the pellets or tablets in a vacuum in order to enable the reducing agent to react on the inclusions without substantial sublimation of the metal or the metals of the alloy; and eliminating a surface layer from the pellets or tablets. The invention is applicable to manufacturing mechanical parts out of superalloys.

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Rosult, France

Philippe Liebaert