Process and apparatus for obtaining silicon from fluosilicic acid

Patent · Tue Jun 28 00:00:00 EDT 1988

OSTI ID:6870148

Sanjurjo, A

A process is described for producing solar grade silicon by reaction of gaseous silicon tetrafluoride with sodium in substantially stoichiometeric quantities to produce a reaction product from which silicon is recovered and wherein the silicon tetrafluoride gas used in the reaction is obtained by thermal decomposition of sodium fluosilicate which is precipitated from aqueous fluosilicate acid generated from phosphate rock conversion to fertilizer.

• Assignee: SRI International, Menlo Park, CA
• Patent Number(s): US 4753783
• OSTI ID: 6870148
• Resource Relation: Patent File Date: Filed date 26 Nov 1985
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
14 SOLAR ENERGY
SEPARATION EQUIPMENT
SILICON
PRODUCTION
SILICON FLUORIDES
SEPARATION PROCESSES
AQUEOUS SOLUTIONS
CHEMICAL REACTION YIELD
FLUORINE COMPOUNDS
HEATING
PHOSPHATE ROCKS
RECOVERY
SILICIC ACID
SILICON SOLAR CELLS
SODIUM
SODIUM SILICATES
ALKALI METAL COMPOUNDS
ALKALI METALS
DIRECT ENERGY CONVERTERS
DISPERSIONS
ELEMENTS
EQUIPMENT
FLUORIDES
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
MIXTURES
OXYGEN COMPOUNDS
PHOTOELECTRIC CELLS
PHOTOVOLTAIC CELLS
ROCKS
SEDIMENTARY ROCKS
SEMIMETALS
SILICATES
SILICON COMPOUNDS
SODIUM COMPOUNDS
SOLAR CELLS
SOLAR EQUIPMENT
SOLUTIONS
YIELDS
400201* - Chemical & Physicochemical Properties
140501 - Solar Energy Conversion- Photovoltaic Conversion