Process and apparatus for obtaining silicon from fluosilicic acid
Abstract
Process and apparatus for producing low cost, high purity solar grade silicon ingots in single crystal or quasi single crystal ingot form in a substantially continuous operation in a two stage reactor starting with sodium fluosilicate and a metal more electropositive than silicon (preferably sodium) in separate compartments having easy vapor transport therebetween and thermally decomposing the sodium fluosilicate to cause formation of substantially pure silicon and a metal fluoride which may be continuously separated in the melt and silicon may be directly and continuously cast from the melt.
- Inventors:
-
- San Jose, CA
- Issue Date:
- OSTI Identifier:
- 866634
- Patent Number(s):
- 4753783
- Application Number:
- 06/802,633
- Assignee:
- SRI International (Menlo Park, CA)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
C - CHEMISTRY C30 - CRYSTAL GROWTH C30B - SINGLE-CRYSTAL-GROWTH
- DOE Contract Number:
- 954471-NAS 7-100
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- process; apparatus; obtaining; silicon; fluosilicic; acid; producing; cost; purity; solar; grade; ingots; single; crystal; quasi; ingot; form; substantially; continuous; operation; stage; reactor; starting; sodium; fluosilicate; metal; electropositive; preferably; separate; compartments; easy; vapor; transport; therebetween; thermally; decomposing; formation; pure; fluoride; continuously; separated; melt; directly; cast; fluosilicic acid; sodium fluosilicate; thermally decomposing; continuous operation; substantially pure; single crystal; solar grade; stage reactor; purity solar; obtaining silicon; metal fluoride; substantially continuous; separate compartments; preferably sodium; pure silicon; vapor transport; silicon ingots; quasi single; reactor starting; grade silicon; continuously separated; ingot form; silicic acid; continuously cast; crystal ingot; /423/
Citation Formats
Sanjurjo, Angel. Process and apparatus for obtaining silicon from fluosilicic acid. United States: N. p., 1988.
Web.
Sanjurjo, Angel. Process and apparatus for obtaining silicon from fluosilicic acid. United States.
Sanjurjo, Angel. Tue .
"Process and apparatus for obtaining silicon from fluosilicic acid". United States. https://www.osti.gov/servlets/purl/866634.
@article{osti_866634,
title = {Process and apparatus for obtaining silicon from fluosilicic acid},
author = {Sanjurjo, Angel},
abstractNote = {Process and apparatus for producing low cost, high purity solar grade silicon ingots in single crystal or quasi single crystal ingot form in a substantially continuous operation in a two stage reactor starting with sodium fluosilicate and a metal more electropositive than silicon (preferably sodium) in separate compartments having easy vapor transport therebetween and thermally decomposing the sodium fluosilicate to cause formation of substantially pure silicon and a metal fluoride which may be continuously separated in the melt and silicon may be directly and continuously cast from the melt.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1988},
month = {6}
}
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