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Impurities Removal From Metallurgical Grade Silicon Using Gas Blowing Refining Techniques

机译：吹气精炼技术去除冶金级硅中的杂质

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The removal of impurities from metallurgical grade silicon using the O-2 and H2O-O-2 gas blowing techniques was firstly studied by thermodynamics. The relationships between the boron content in refined silicon and the equilibrium partial pressures of gaseous boride species were established, which shows a theoretical limitation for boron removal from metallurgical grade silicon using the H2O-O-2 gas blowing technique. The data also showed that the impurity boron in silicon was mainly volatilized in the form of B3H3O6, BHO2 and BO and the volatilization of boric hydrate species was much more than that of the oxide species. The impurities removal from metallurgical grade silicon including Fe, Al, Ca, Ti, B, P and C was studied using an O-2 gas blowing in a ladle and in succession a mixed Ar-H2O-O-2 gas blowing was operated in a DC arc furnace for boron removal. It showed a removal efficiency higher than 90 % for Al, Ca and 50 % for B using the O-2 gas blowing technique in the ladle. Impurity boron was reduced from 35 ppmw to 18 ppmw in the ladle and it was once again reduced to 0.6 ppmw using an Ar-H2O-O-2 gas blowing technique in the DC arc furnace for a systematic pressure of 5 Pa when the ratio of H2O to O-2 and the refining times are 2:1 and 12 min, respectively.
机译：首先通过热力学研究了使用O-2和H2O-O-2吹气技术从冶金级硅中去除杂质的方法。建立了精炼硅中的硼含量与气态硼化物物种的平衡分压之间的关系，这表明了使用H2O-O-2吹气技术从冶金级硅中脱除硼的理论限制。数据还表明，硅中的杂质硼主要以B3H3O6，BHO2和BO的形式挥发，硼水合物的挥发远大于氧化物的挥发。使用在钢包中吹气的O-2气体研究了从冶金级硅中去除的杂质，包括Fe，Al，Ca，Ti，B，P和C，随后在Al2O3中连续运行Ar-H2O-O-2混合气直流电弧炉用于除硼。使用钢包中的O-2吹气技术，对Al，Ca和B的去除效率均高于90％。钢包中的杂质硼从35 ppmw降至18 ppmw，在直流电弧炉中使用Ar-H2O-O-2吹气技术，当系统压力为5 Pa时，硼再次降低至0.6 ppmw。从H2O到O-2的时间和精制时间分别为2：1和12分钟。

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