Abstract: A ferrosilicon-based ferroalloy for inoculation of spherulitic graphite irons containing (by weight) from 0.005% to 3% rare earths, 0.005% to 3% bismuth, lead and/or antimony, and 0.3% to 3% calcium, and is characterized by the fact that Si/Fe>2 and contains from 0.3 to 3% magnesium. The ferroalloy exhibits improved granulometric stability during storage.

Abstract: A metallurgical silicon is disclosed which contains substantially from 30 to 180 ppm of phosphorus comprised of a crystalline phase of primary silicon having a dissolved phosphorus content between 30 and 150 parts per million and intermetal phases whose global ratio is between 0.5 and 2%, wherein among the intermediary phases, the phase Si.sub.2 Al.sub.2 Ca does not exceed 0.3% of the total of the metallurgical silicon mass. The metallurgical silcon is used for the synthesis of alkyl or aryl halogenosilanes useful for the preparation of silicones.

Abstract: A metallurgical silicon with controlled microstructure for the preparation of halogenosilanes, characterized by an image of the microstructure obtained with the scanning electron microscope which is processed by binarization between an intermetallic phase and a silicon matrix, with expansion in zones corresponding to the intermetallic phase with an extension of about 10 .mu.m around these zones. The ratio of the surface fraction of the intermetallic phase after expansion to the intermetallic phase before expansion, S/S.sub.0, is between 20 and 40. The silicon according to the invention assures an elevated reactivity in the Rochow reaction for the production of halogenosilanes intended for the preparation of silicones.

Abstract: The invention relates to a silicon alloy intended for the production of alkyl or aryl halogenosilanes using the Rochow reaction, comprising, in percent by weight:0.05<Al<0.300.01<Ca<0.300.02<O.sub.2 <0.200.10<Fe<0.500.01<Ti<0.15x<Cu<2+xwhere x=3.2 (% Ca)+9.4 (% Al) the remainder being silicon. The alloy according to the invention makes it possible to improve the reactivity and the selectivity of the reaction.

Abstract: Apparatus for the late introduction of a particulate alloy when casting liquid metal, disposed between a casting ladle or an apparatus for the automatic feed of said metal and a series of moulds to be filled, characterised in that it comprises a jet of liquid metal of sufficient thickness, which is confined and in motion in a mixing chamber, for example a vortex, and a non-immersed introduction means (8) for the introduction of particles of alloy, imparting to said particles a speed and an energy sufficient for them to penetrate deeply into the interior of the liquid metal in the zone (4) of sufficient thickness, said zone being disposed in the vicinity of a casting orifice (5).

Abstract: A method for producing a composite wire for addition of solid products to metal baths in which the core comprises the addition products and a sheath of plastic material covers the core. The wire is produced by a coextrusion of the core and the sheath. The core comprises a mixture of a powder of addition product and a thermoplastic polymer powder, while the sheath comprises a thermoplastic polymer powder which can be the same as the thermoplastic of the core.