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Title: Apparatus for obtaining silicon from fluosilicic acid

Abstract

Apparatus for producing low cost, high purity solar grade Si wherein a reduction reaction, preferably the reduction of SiF.sub.4, by an alkali metal (Na preferred) is carried out by jetting a spray of reactants into a reaction chamber at a rate and temperature which causes the reaction to take place far enough away from the entry region to avoid plugging of reactants at the entry region and wherein separation in the melt is carried out continuously from the reaction and the Si can be cast directly from the melt. The melt separation is provided by openings in the reaction chamber wall between about 2 and 3.5 millimeters in width. The Si is retained within the reaction chamber due to its surface tension.

Inventors:
 [1]
  1. San Jose, CA
Issue Date:
OSTI Identifier:
865905
Patent Number(s):
4597948
Application Number:
06/569,439
Assignee:
SRI International (Menlo Park, CA)
Patent Classifications (CPCs):
B - PERFORMING OPERATIONS B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL B01J - CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY
C - CHEMISTRY C01 - INORGANIC CHEMISTRY C01B - NON-METALLIC ELEMENTS
DOE Contract Number:  
954471-NAS 7-100
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
apparatus; obtaining; silicon; fluosilicic; acid; producing; cost; purity; solar; grade; reduction; reaction; preferably; sif; alkali; metal; na; preferred; carried; jetting; spray; reactants; chamber; rate; temperature; causes; entry; region; avoid; plugging; separation; melt; continuously; cast; directly; provided; openings; wall; millimeters; width; retained; due; surface; tension; na preferred; fluosilicic acid; reaction chamber; alkali metal; chamber wall; surface tension; solar grade; purity solar; entry region; obtaining silicon; reduction reaction; melt separation; avoid plugging; cast directly; silicic acid; /422/423/

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/865905.
@article{osti_865905,
title = {Apparatus for obtaining silicon from fluosilicic acid},
author = {Sanjurjo, Angel},
abstractNote = {Apparatus for producing low cost, high purity solar grade Si wherein a reduction reaction, preferably the reduction of SiF.sub.4, by an alkali metal (Na preferred) is carried out by jetting a spray of reactants into a reaction chamber at a rate and temperature which causes the reaction to take place far enough away from the entry region to avoid plugging of reactants at the entry region and wherein separation in the melt is carried out continuously from the reaction and the Si can be cast directly from the melt. The melt separation is provided by openings in the reaction chamber wall between about 2 and 3.5 millimeters in width. The Si is retained within the reaction chamber due to its surface tension.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {7}
}

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