Abstract
A major challenge in recycling of silicon powder from kerf loss slurry waste is the complete removal of metal particles. The traditional acid leaching method is costly and not green. In this paper, a novel approach to recover high-purity Si from the kerf loss slurry waste of solar grade silicon was investigated. The metal impurities were removed with superconducting high gradient magnetic separation technology. The effects of process parameters such as magnetic flux density, slurry density, and slurry flow velocity on the removal efficiency were investigated, and the parameters were optimized. In one lot of control experiments, the silicon content was increased from 90.91 to 95.83%, iron content reduced from 3.24 to 0.57%, and aluminum content from 2.44 to 1.51% under the optimum conditions of magnetic flux density of 4.0 T, slurry density of 20 g/L, and slurry flow velocity of 500 mL/min. The result indicates that the superconducting high gradient magnetic separation technology is a feasible purifying method, and the magnetic separation concentrate could be used as an intermediate product for high-purity Si powder.
Highlights
Conventional energy shortage and environmental concerns have made the solar energy industry popular globally
The rapid development of photovoltaic industries leads to a shortage of polysilicon, which is the material of choice to fabricate photovoltaic converter, and its price has multiplied [3,4,5]
The raw material used in experiments was the primary silicon powder prepared from the kerf loss slurry waste by centrifugation at Henan Solar Energy Silicon Products Company, China
Summary
Conventional energy shortage and environmental concerns have made the solar energy industry popular globally. Keywords Silicon powder · Kerf loss slurry waste · Superconducting high gradient magnetic separation technology · Metal impurities removal · Purification A higher magnetic flux density gives higher separation efficiency [17], so the superconducting HGMS is more suitable for capturing fine weakly magnetic particles.
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