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以硼含量为16.6×10~(-6)(质量比)的冶金级硅为原料,在高温电阻炉中,利用SiO_2-CaO-CaCl_2、SiO_2-CaCl_2和CaO-CaCl_2造渣剂进行渣硅比、精炼时间、精炼温度和CaCl_2不同配比的除硼精炼实验。研究发现,在熔渣精炼除硼过程中,随着温度的升高和精炼时间的增长,硅中硼含量越来越低,而渣中硼含量越来越高。当渣硅比为2∶1、精炼温度为1550℃、精炼时间为120 min时,硼的分配系数LB由0.93增大到2.85,杂质硼的去除效果最好。在SiO_2-CaO-CaCl_2三元体系中加入质量比为16.67%CaCl_2时,硼的分配系数最高达到3.71,精炼效果最好。本研究为进一步获得低硼含量的高纯硅产品提供了依据。
The metallurgical grade silicon with a boron content of 16.6 × 10 -6 (mass ratio) was used as raw material in the high temperature resistance furnace. The slag-silicon ratio was calculated by SiO_2-CaO-CaCl_2, SiO_2-CaCl_2 and CaO-CaCl_2 slag- , Refining time, refining temperature and different proportions of CaCl2 boron removal refining experiments. The study found that in the process of slag removal and boron removal, with the increase of temperature and refining time, the content of boron in silicon is getting lower and lower, while the content of boron in slag is getting higher and higher. When the ratio of slag to silicon is 2:1, the refining temperature is 1550 ℃ and the refining time is 120 min, the distribution coefficient of boron, LB, increases from 0.93 to 2.85, and the removal efficiency of impurity boron is the best. In the SiO_2-CaO-CaCl_2 ternary system, when the mass ratio is 16.67% CaCl 2, the partition coefficient of boron reaches up to 3.71, the refining effect is the best. This study provides the basis for further obtaining high purity silicon products with low boron content.