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首页> 外文期刊>Separation and Purification Technology >Modified sedimentation system for improving separation of silicon and silicon carbide in recycling of sawing waste
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Modified sedimentation system for improving separation of silicon and silicon carbide in recycling of sawing waste

机译：改进的沉降系统，可改善锯屑回收中硅和碳化硅的分离

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摘要

Recycling kerf silicon from sawing waste may be a good solution to overcoming the shortage of silicon feedstock in photovoltaic industries. This study reports the application of a horizontal electrical field to a sedimentation cell. Due to the small size, low density, and high negative charges in a solution of pH 7, the electrical field enhanced the displacement of Si more than SiC particles, leading to a Si distribution on the bottom of sedimentation cell. Separation performance was not enhanced efficiently by increasing the operation time or the strength of the electrical field, but was improved obviously by baffle plates, which reduced the dispersion between particles and easily captured the tiny Si particles. The minimum SiC content was obtained near the cell outlet, and only 7.6 wt% SiC remaining in the mixture. The recovered material with high Si content can be transferred to an induction furnace to generate solar-grade Si.
机译：从锯切废料中回收切缝硅可能是克服光伏行业中硅原料短缺的一个很好的解决方案。这项研究报告了水平电场在沉淀池中的应用。由于pH值为7的溶液中的小尺寸，低密度和高负电荷，电场比SiC颗粒更能增强Si的位移，从而导致Si在沉淀池底部的分布。分离性能没有通过增加操作时间或电场强度而得到有效提高，但是通过挡板进行了明显改善，分离板减少了颗粒之间的分散并易于捕获细小的Si颗粒。在电池出口附近获得了最小的SiC含量，混合物中仅剩余7.6 wt％的SiC。可以将回收的具有高Si含量的材料转移到感应炉中以生成太阳能级的Si。

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