METHOD AND EQUIPMENT FOR MANUFACTURING MULTI-CRYSTALLINE SOLAR GRADE SILICON FROM METALLURGICAL SILICON

摘要

A method and apparatus for manufacturing multi-crystalline solar grade silicon from metallurgical silicon. The silicon is provided in a boat (2) in a closed housing (3), and is subjected to horizontal refining in a repeatable process where one or more zones (X) of the silicon at a time is heated by a heater (1) at preferably constant speed along the total length of the boat (2), whereby a purging gas under the refining operation is passed along the boat (2) from one inlet (4) end of the housing to an outlet (5) at the other end of the housing purging of any impurities being generated under the refining operation.