LINING FOR SURFACES OF A REFRACTORY CRUCIBLE FOR PURIFICATION OF SILICON AND METHOD OF PURIFICATION OF THE SILICON MELT USING THAT CRUCIBLE(S) FOR MELTING AND FURTHER DIRECTIONAL SOLIDIFICATION

摘要

Crucible for molten silicon includes at least one refractory material with inner surface and deposits to the lining on the inner surface, and the lining includes colloidal silicon dioxide. Method for purifying silicon includes: that the first silicon is melted in the inside of fusion crucible to provide the first molten silicon, and the fusion crucible includes the first refractory material, and first refractory material has at least one first inner surface limited inside fusion crucible; The first molten silicon of directional solidification is in directional solidification mold to provide the second silicon, and the directional solidification mold includes the second refractory material, and second refractory material has at least one second inner surface for limiting mould inside; With at least part for using the lining comprising colloidal silicon dioxide to coat at least one inner surface in the first inner surface and the second inner surface.