The invention relates to a method for directly preparing high-purity
silicon and
titanium-
silicon alloy from
titanium-
silicon materials, and belongs to the technical field of efficient and comprehensive utilization of
titanium-silicon
material resources.
Titanium-silicon materials with different contents of silicon are adopted as raw materials,
electromagnetic induction is adopted for heating andmelting, and vacuum volatilization is conducted on the
molten alloy materials under air pressure for refining and
impurity removal;
electromagnetic stirring is conducted on the molten materials obtained after the
impurity removal for
directional solidification and strengthened separation, and during the
directional solidification, silicon which is preferentially precipitated deposits on the bottomof a
crucible under the action of an
electromagnetic stirring force and a
temperature gradient; however, a titanium-
silicon alloy phase is precipitated on the upper part of the
crucible, and two products, the high-purity silicon and the titanium-
silicon alloy, are obtained; the products is
cut along an interface of separation, and the high-purity silicon with low contents of
boron and phosphorusand the titanium-
silicon alloy with low content of iron are obtained. According to the method for directly preparing the high-purity silicon and the titanium-silicon
alloy from the titanium-silicon materials, the purity of the obtained high-purity silicon is more than 99.995%, and the content of titanium in the titanium-silicon
alloy is 20-30%; compared with a traditional preparation technology of the high-purity silicon and the titanium-silicon alloy, the method has the advantages of being short in process, low in cost and the like, and
mass production is easy to achieve.