Patent · US Expired

Process of melting down and purifying silicon

US4151264A · kind A · utility

6Cited by

3References

4Claims

0Family size

Assignee

Wacker Chemie AG · DE

Inventors

Anton More · Burghausen, DE
Rudolf Riedle · Burghausen, DE
Herbert Straussberger · Mehring, DE
Willi Streckel · Schweich, DE
Johann Muschi · Munich, DE

Key dates

Filing date	Jan 25, 1978
Grant date	Apr 24, 1979
Priority date	—
Expiry date	Jan 25, 1998

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC01B33/037
WIPO fieldMaterials, metallurgy
WIPO sectorChemistry

Abstract

A process of melting down and purifying silicon, which comprises melting silicon in at least half of the amount up to double of the amount of a silicate melt heated by resistance heating up to a temperature of at least 1,420.degree. C., said melt consisting of 2-30% by weight of calcium oxide, 5-35% by weight of magnesium oxide, wherein the sum of calcium oxide and magnesium oxide will be 15-38% by weight, 0.5-28% by weight of aluminum oxide and 45-70% by weight of silicon dioxide, and wherein, to the melt are added at least 0.29% by weight of elementary and/or chemically bound copper, preferably 0.50-3% by weight, calculated on the silicon amount.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.