Process for Removing Nonmetallic Impurities from Metallurgical Silicon
AssigneesBerlin solar GmbH, Spawnt Private S.à.r.l.
InventorsSeyed-Javad Mohsseni-Ala, Christian Bauch, Rumen Deltschew, Thoralf Gebel, Gerd Lippold, Matthias Heuer, Fritz Kirscht, Kamel Ounadjela
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Abstract
The invention describes a process for removing nonmetallic impurities from metallurgical silicon. A melt is produced from metallurgical silicon and halide-containing silicon. As a result, the impurities are sublimed out and removed from the melt in the form of nonmetal halides. Compared with the known process, in which gaseous halogen is blown through an Si melt, the novel process can be carried out in a particularly simple and efficient manner.
Claims26
A process for removing nonmetallic impurities from metallurgical silicon, comprising:
- mixing halide-containing silicon with the metallurgical silicon to be purified;
- and
- melting the mixture and thereby sublimating out the impurities and removing the same from the melt in form of nonmetal halides.
A process for removing nonmetallic impurities from metallurgical silicon, comprising:
- melting the metallurgical silicon to be purified;
- introducing halide-containing silicon into the melt and thereby sublimating out the nonmetallic impurities and removing the same from the melt in form of nonmetal halides.
Dependencies are inferred from the claim text.