|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Solar Cell Silicon
||Evaporation Removal of Boron in Molten Silicon Using Reactive Fluxes
||Ye Wang, Kazuki Morita
|On-Site Speaker (Planned)
In order to optimize the B removal during slag-refining process for solar-grade silicon production, a new process for the removal of B in molten Si was proposed based on the principle of oxidized chlorination and evaporation. B can be generated and evaporated in the form of B-containing gas (BOCl) from molten Si using CaO-SiO2-CaCl2 slag system. Compared with the binary systems of CaO-CaCl2 and SiO2-CaCl2 slag, the ternary slag system CaO-SiO2-CaCl2 showed a better potential (90 pct) for B removal at 1723K for 2 hours. Moreover, the diffusion coefficient (D) of B in the slag was also determined using tube-molten pool method. Through this, it was found that the rate-limiting step of B-removal in the slag refining process is controlled by B transfer in the slag interface and surface.
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