Open AccessBoron removal from metallurgical grade silicon using a FeCl2 molten salt refining technique
Author(s) -
Bin Jia,
Jijun Wu,
Wenhui Ma,
Bin Yang,
D.C. Liu,
Yongnian Dai
Publication year - 2013
Publication title -
journal of mining and metallurgy. section b, metallurgy/journal of mining and metallurgy. section b, metallurgy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.42
H-Index - 20
eISSN - 2217-7175
pISSN - 1450-5339
DOI - 10.2298/jmmb120823019j
Subject(s) - boron , refining (metallurgy) , molten salt , silicon , slag (welding) , metallurgy , materials science , salt (chemistry) , chemistry , organic chemistry
The slag refining for boron removal from metallurgical grade silicon is a promising metallurgical process for producing solar grade silicon. In this paper, FeCl2 molten salt has been used as a new refining agent to remove boron from MG-Si. The effects of refining time and mass ratio of MG-Si to FeCl2 molten salt on boron removal have been investigated in detail. The results showed that boron can be efficiently removed in form of BCl3 and boron concentration in MG-Si was successfully reduced from 22×10-6 to 4×10-6 at 1823K for 2 h with the mass ratio of FeCl2 molten salt to MG-Si for 1.0. The rate equation of boron removal using FeCl2 molten salt was proposed and established in kinetic, which showed a large difference in removal limitation of boron compared with thermodynamics