EP 1991500 A2 20081119 - PRODUCTION OF SOLAR AND ELECTRONIC GRADE SILICON FROM ALUMINOSILICATE CONTAINING MATERIAL
Title (en)
PRODUCTION OF SOLAR AND ELECTRONIC GRADE SILICON FROM ALUMINOSILICATE CONTAINING MATERIAL
Title (de)
HERSTELLUNG VON SILICIUM MIT SOLAR- UND ELEKTRONIKQUALITÄT AUS ALUMINOSILIKATHALTIGEM MATERIAL
Title (fr)
PRÉPARATION DE SILICIUM DE QUALITÉ SOLAIRE ET ÉLÉCTRONIQUE À PARTIR DE MATÉRIAUX CONTENANT DES ALUMINOSILICATES
Publication
Application
Priority
- IB 2007050535 W 20070220
- EP 06110176 A 20060220
- EP 07705914 A 20070220
Abstract (en)
[origin: WO2007116326A2] The present invention relates to the recovery of silica from aluminosilicate-containing material and the production of solar and/or electronic grade silicon there from. In particular, a process for manufacturing silicon comprises subjecting highly pure and particulate silica in amorphous form to an in-flight plasma carbothermic reduction in a plasma reactor comprising a plasma torch and a vessel suitable for plasma-associated chemical reaction of silica and collection of liquid silicon. The highly pure and particulate silica is preferably produced using a process for manufacturing silica and/or alumina from an aluminosilicate-containing material comprising mixing the material with a metal chloride, preferably calcium chloride, being in the form of a solution or slurry, subjecting the wet mixture to a granulation step, burning the granules at a temperature of 900-1300°C, leaching the obtained heated mixture with hydrochloric acid to obtain a salt solution and insoluble silica, separating insoluble silica from the salt solution, and recovering dry silica. Alumina may be produced by crystallizing AlCl<SUB>3</SUB> from the salt solution and heating the AlCl<SUB>3</SUB>*6H<SUB>2</SUB>O crystals to produce alumina.
IPC 8 full level
C01B 33/02 (2006.01); C01B 33/025 (2006.01); C01B 33/12 (2006.01); C01B 33/187 (2006.01); C01B 33/193 (2006.01); C01F 7/22 (2006.01); C01F 7/306 (2022.01)
CPC (source: EP)
B01J 8/0055 (2013.01); B01J 19/088 (2013.01); C01B 33/02 (2013.01); C01B 33/025 (2013.01); C01B 33/12 (2013.01); C01B 33/126 (2013.01); C01B 33/187 (2013.01); C01B 33/26 (2013.01); C01F 7/22 (2013.01); C01F 7/306 (2013.01); C01F 11/24 (2013.01); B01J 2219/00094 (2013.01); B01J 2219/0883 (2013.01)
Citation (search report)
See references of WO 2007116326A2
Designated contracting state (EPC)
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR
DOCDB simple family (publication)
WO 2007116326 A2 20071018; WO 2007116326 A3 20080131; EP 1991500 A2 20081119
DOCDB simple family (application)
IB 2007050535 W 20070220; EP 07705914 A 20070220