Process and apparatus for obtaining silicon from fluosilicic acid
Patent
·
OSTI ID:7071170
Process and apparatus are 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 4753783; A
- Application Number:
- CNN: 954471-NAS 7-100; PPN: US 6-802633
- OSTI ID:
- 7071170
- Resource Relation:
- Patent File Date: 26 Nov 1985
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
14 SOLAR ENERGY
SILICON
CHEMICAL VAPOR DEPOSITION
SILICON FLUORIDES
DECOMPOSITION
SILICON SOLAR CELLS
MATERIALS
INORGANIC ACIDS
CHEMICAL COATING
CHEMICAL REACTIONS
DEPOSITION
DIRECT ENERGY CONVERTERS
ELEMENTS
EQUIPMENT
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
SEMIMETALS
SILICON COMPOUNDS
SILICON HALIDES
SOLAR CELLS
SOLAR EQUIPMENT
SURFACE COATING
360601* - Other Materials- Preparation & Manufacture
140501 - Solar Energy Conversion- Photovoltaic Conversion
14 SOLAR ENERGY
SILICON
CHEMICAL VAPOR DEPOSITION
SILICON FLUORIDES
DECOMPOSITION
SILICON SOLAR CELLS
MATERIALS
INORGANIC ACIDS
CHEMICAL COATING
CHEMICAL REACTIONS
DEPOSITION
DIRECT ENERGY CONVERTERS
ELEMENTS
EQUIPMENT
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
SEMIMETALS
SILICON COMPOUNDS
SILICON HALIDES
SOLAR CELLS
SOLAR EQUIPMENT
SURFACE COATING
360601* - Other Materials- Preparation & Manufacture
140501 - Solar Energy Conversion- Photovoltaic Conversion