Evaporation Removal of Boron from Metallurgical-Grade Silicon Using CaO-CaCl2-SiO2 Slag
Evaporation Removal of Boron from Metallurgical-Grade Silicon Using CaO-CaCl2-SiO2 Slag
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DOI：
10.1007/s11663-014-0031-1
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发表时间：
2014-02
期刊：
影响因子：
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通讯作者：
Ye Wang;Xiaodong Ma;Kazuki Morita
中科院分区：
文献类型：
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作者：
Ye Wang;Xiaodong Ma;Kazuki Morita
为了优化太阳级硅渣精炼过程中B的去除，提出了一种基于氧化氯化蒸发原理的硅液B的去除新工艺。在1723 K（1450℃）条件下，通过计算bo1.5 - cacl2渣中形成物质的蒸气压，可以得到B以含B气体的形式生成和蒸发。选用cao - sio2 - cacl2渣去除Si熔液中的B。在渣精实验中，与cao - sio2 - cacl2渣二元体系相比，cao - sio2 - cacl2渣三元体系对B的去除率更高（86%）。此外，还讨论了脱除效率、估算蒸发效率和分配比之间的关系。
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 on the basis of calculated vapor pressures of forming species in the BO1.5-CaCl2slag at 1723 K (1450 °C). CaO-SiO2-CaCl2slag was selected to remove B in molten Si. In the slag-refining experiments, compared with the binary systems of CaO-CaCl2and SiO2-CaCl2slag, the ternary slag system CaO-SiO2-CaCl2showed a better potential (86 pct) for B removal. Furthermore, the relationships among the removal efficiency, the estimated evaporative efficiency, and the partition ratio were all discussed.