METHOD AND PLANT FOR PURIFYING SILICON FROM A MIXTURE OBTAINED BY CUTTING SILICON BRICKS INTO WAFERS

METHOD AND PLANT FOR PURIFYING SILICON FROM A MIXTURE OBTAINED BY CUTTING SILICON BRICKS INTO WAFERS

The invention relates to a method for reducing the metal, oxygen and carbon content, in a single melting and solidification cycle, of the micron-sized particles of silicon in the solid mixture resulting from the cutting of silicon bricks into wafers (also referred to as kerf), said method involving...

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Bibliographische Detailangaben
Hauptverfasser: DREVET, Béatrice, BAILLY, Séverine, PONTHENIER, Damien, BENMANSOUR, Malek
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Beschreibung
Zusammenfassung:The invention relates to a method for reducing the metal, oxygen and carbon content, in a single melting and solidification cycle, of the micron-sized particles of silicon in the solid mixture resulting from the cutting of silicon bricks into wafers (also referred to as kerf), said method involving a device for filtering slag consisting of SiO2 and SiC. After filtration of these solid residues, the liquid phase undergoes a step of segregating the metallic impurities of the silicon by directional solidification. The filtration system has the advantage that it can be adapted in particular to a standard industrial DSS (Directional Solidification System) furnace as used in the photovoltaic industry.