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Title: 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:
 [1]
  1. 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 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
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}
}

Patent:

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