Removal of Boron from Silicon-Tin Solvent by Slag Treatment
Removal of Boron from Silicon-Tin Solvent by Slag Treatment
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DOI：
10.1007/s11663-013-9812-1
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发表时间：
2013-06-01
影响因子：
3
通讯作者：
Morita, Kazuki
中科院分区：
文献类型：
--
作者：
Ma, Xiaodong;Yoshikawa, Takeshi;Morita, Kazuki
为了有效地去除太阳能电池用硅中的B，研究了一种新的工艺，该工艺包括在熔融硅中添加Sn的渣精炼。通过化学平衡技术测定了1673 K（1400 A ℃）下B在CaO-SiO 2 -24 mol % CaF 2渣和Si-Sn合金之间的分配比。结果表明，随着Sn含量的增加，合金中B的分配比显著增加，这与合金中B的活度系数和氧分压的增加有关。当合金成分为Si-82.4mol%Sn时，分配函数高达200，这远高于1至3范围内的报道值。从Si-30、50和70 mol % Sn熔体中除去B所需的炉渣量仅为在单次炉渣处理中直接从MG-Si中除去B所需的炉渣量的15.6%、6.5%和1.2%。
To eliminate B effectively from Si for its use in a solar cell, a novel process involving the slag refining of molten Si with Sn addition was investigated. The partition ratio of B between CaO-SiO2-24 mol pct CaF2 slag and Si-Sn alloy at 1673 K (1400 A degrees C) was determined by the chemical equilibrium technique. It was found that the partition ratio of B was remarkably increased with the increase in Sn content of alloy, which attributes to the increase in activity coefficient of B as well as the oxygen partial pressure. The partition function was accounted as much as 200 when the alloy composition was Si-82.4 mol pct Sn, which was much higher than the reported values in the range of 1 to 3. The required amounts of slag used for B removal from Si-30, 50, and 70 mol pct Sn melts were only 15.6 pct, 6.5 pct, and 1.2 pct of that used for the removal of B directly from MG-Si without Sn addition in a single slag treatment.