Is a
Patent attributes
Current Assignee
Patent Jurisdiction
Patent Number
Patent Inventor Names
Ragnar Tronstad0
Erik Enebakk0
Gabriella Maria Tranell0
Date of Patent
December 21, 2010
Patent Application Number
12501725
Date Filed
July 13, 2009
Patent Primary Examiner
Patent abstract
A method for making solar grade silicon from metallurgical grade silicon is accomplished by treating a calcium silicate based slag with ferrosilicon in the first vessel so as to obtain a purification of the calcium silicate based slag. In a second vessel, the purified calcium based silicate slag is used to treat metallurgical grade silicon in order to obtain a solar grade silicon. The purification of calcium silicate based slag in the first vessel is accomplished to reduce phosphorous to a level of less than 3 ppmw.
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