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Title: Process and apparatus for obtaining silicon from fluosilicic acid

Abstract

An 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 inside a reaction chamber. The chamber wall and bottom surfaces are formed of graphite and configured with drainage channels so as to facilitate the continuous separation of the products of reaction (Si and NaF) and removal of the molten salt by discharging the salt through one or more ports at the bottom of the reaction chamber. Such process is especially useful where it is desirable to discharge the reaction salt products from the reactor and retain silicon within the chamber for later removal.

Inventors:
 [1];  [2]
  1. Palo Alto, CA
  2. San Jose, CA
Issue Date:
OSTI Identifier:
865822
Patent Number(s):
4584181
Application Number:
06/453,337
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:
process; apparatus; obtaining; silicon; fluosilicic; acid; producing; cost; purity; solar; grade; reduction; reaction; preferably; sif; alkali; metal; na; preferred; carried; inside; chamber; wall; bottom; surfaces; formed; graphite; configured; drainage; channels; facilitate; continuous; separation; products; naf; removal; molten; salt; discharging; ports; especially; useful; desirable; discharge; reactor; retain; na preferred; fluosilicic acid; bottom surfaces; especially useful; reaction chamber; alkali metal; molten salt; bottom surface; chamber wall; solar grade; purity solar; obtaining silicon; reduction reaction; continuous separation; silicic acid; /422/23/136/266/423/

Citation Formats

Nanis, Leonard, and Sanjurjo, Angel. Process and apparatus for obtaining silicon from fluosilicic acid. United States: N. p., 1986. Web.
Nanis, Leonard, & Sanjurjo, Angel. Process and apparatus for obtaining silicon from fluosilicic acid. United States.
Nanis, Leonard, and Sanjurjo, Angel. Tue . "Process and apparatus for obtaining silicon from fluosilicic acid". United States. https://www.osti.gov/servlets/purl/865822.
@article{osti_865822,
title = {Process and apparatus for obtaining silicon from fluosilicic acid},
author = {Nanis, Leonard and Sanjurjo, Angel},
abstractNote = {An 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 inside a reaction chamber. The chamber wall and bottom surfaces are formed of graphite and configured with drainage channels so as to facilitate the continuous separation of the products of reaction (Si and NaF) and removal of the molten salt by discharging the salt through one or more ports at the bottom of the reaction chamber. Such process is especially useful where it is desirable to discharge the reaction salt products from the reactor and retain silicon within the chamber for later removal.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1986},
month = {4}
}

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