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Title: Apparatus for obtaining silicon from fluosilicic acid

Abstract

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:
 [1]
  1. San Jose, CA
Issue Date:
OSTI Identifier:
865857
Patent Number(s):
4590043
Application Number:
06/453,734
Assignee:
SRI International (Menlo Park, CA)
Patent Classifications (CPCs):
C - CHEMISTRY C30 - CRYSTAL GROWTH C30B - SINGLE-CRYSTAL-GROWTH
Y - NEW / CROSS SECTIONAL TECHNOLOGIES Y02 - TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE Y02E - REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
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; /117/422/

Citation Formats

Sanjurjo, Angel. Apparatus for obtaining silicon from fluosilicic acid. United States: N. p., 1986. Web.
Sanjurjo, Angel. Apparatus for obtaining silicon from fluosilicic acid. United States.
Sanjurjo, Angel. Tue . "Apparatus for obtaining silicon from fluosilicic acid". United States. https://www.osti.gov/servlets/purl/865857.
@article{osti_865857,
title = {Apparatus for obtaining silicon from fluosilicic acid},
author = {Sanjurjo, Angel},
abstractNote = {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 = {1986},
month = {5}
}

Patent:

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