Recycling of Solar Silicon Waste by Particle Sedimentation under Electromagnetic Field
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چکیده
Several methods to recycle the top-cut scrap generated during directional solidification of solar silicon are currently being researched. One of these is particle removal by gravity sedimentation. However, natural settling of inclusions by gravitational forces is a slow process and not attractive to industry. This study investigated the sedimentation of micrometer size inclusions (≤ 10 μm) from silicon under a high frequency electromagnetic field. The results show enhanced sedimentation of SiC particles two minutes under the electromagnetic field. This is in contrast to the results obtained by gravity sedimentation without an electromagnetic field, in which almost all of the particles remained in the top-half of the sample after more than three hours. 3-D modeling of the magnetic field within the molten silicon showed the presence of gradient magnetic field. The proposed mechanisms responsible for the improved particle sedimentation under the electromagnetic field are electromagnetic stirring and the effect of the magnetization forces due to the difference in magnetic susceptibility between the melt and particles under a gradient electromagnetic field. Longer separation time, higher coil current and higher frequency promoted the separation efficiency of the process.
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