EP 2534100 A1 20121219 - METHOD FOR RECOVERING SOLAR GRADE SILICON
Title (en)
METHOD FOR RECOVERING SOLAR GRADE SILICON
Title (de)
VERFAHREN ZUR RÜCKGEWINNUNG VON SOLARSILIZIUM
Title (fr)
PROCÉDÉ DE RÉCUPÉRATION DE SILICIUM DE QUALITÉ SOLAIRE
Publication
Application
Priority
- GB 201002448 A 20100212
- NO 2011000053 W 20110214
Abstract (en)
[origin: GB2477782A] A method of refining particulate silicon is disclosed, where the method comprises mixing the particulate silicon with a slag forming compound in a weight ratio, particulate silicon: slag forming compound, from 1:10 to 3:1 in a crucible, wherein the slag forming compound will form a liquid slag at the operating temperature of the process that has a viscosity lower than 2 Ns/m2and a wetting angle towards silicon of at least 20°, heating the mixture of particulate silicon and slag forming component to a temperature above the liquidus temperature of the slag and the silicon, injecting a stream of gas through the bottom of the crucible and maintain the gas flushing for a period of time, solidifying and cooling the molten mixture, and separating formed silicon agglomerates/lumps from the slag. The slag forming compounds may be SiO2, CaO, Li2O, MgO, Na2O, CaF2, NaF, SrO, BaO, MgF2, K2O, CaCO3, Na2CO3or MgCO3.
IPC 8 full level
H01L 31/18 (2006.01); C01B 33/037 (2006.01)
CPC (source: EP GB)
C01B 33/037 (2013.01 - EP GB); H01L 31/182 (2013.01 - EP); Y02E 10/546 (2013.01 - EP); Y02P 70/50 (2015.11 - EP)
Citation (search report)
See references of WO 2011099870A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
DOCDB simple family (publication)
GB 201002448 D0 20100331; GB 2477782 A 20110817; GB 2477782 B 20120829; EP 2534100 A1 20121219; WO 2011099870 A1 20110818
DOCDB simple family (application)
GB 201002448 A 20100212; EP 11706954 A 20110214; NO 2011000053 W 20110214