Apparatus for obtaining silicon from fluosilicic acid

Patent · Tue May 20 00:00:00 EDT 1986

OSTI ID:7256466

Sanjurjo, A

Apparatus is described 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 there between 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. 9 figs.

• Assignee: SRI International, Menlo Park, CA (United States)
• Patent Number(s): US 4590043; A
• Application Number: CNN: 954471-NAS 7-100; PPN: US 6-453734
• OSTI ID: 7256466
• Resource Relation: Patent File Date: 27 Dec 1982
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
14 SOLAR ENERGY
CHEMICAL REACTORS
DESIGN
SILICON
CHEMICAL VAPOR DEPOSITION
SILICON SOLAR CELLS
FABRICATION
DECOMPOSITION
FLUORINE COMPOUNDS
SODIUM FLUORIDES
SODIUM SILICATES
ALKALI METAL COMPOUNDS
CHEMICAL COATING
CHEMICAL REACTIONS
DEPOSITION
DIRECT ENERGY CONVERTERS
ELEMENTS
EQUIPMENT
FLUORIDES
HALIDES
HALOGEN COMPOUNDS
OXYGEN COMPOUNDS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
SEMIMETALS
SILICATES
SILICON COMPOUNDS
SODIUM COMPOUNDS
SOLAR CELLS
SOLAR EQUIPMENT
SURFACE COATING
360601* - Other Materials- Preparation & Manufacture
140501 - Solar Energy Conversion- Photovoltaic Conversion