Driven by the explosive development of the photovoltaic (PV) industry, the treatment of the quartz crucible waste ash (QCWA) from monocrystalline silicon rod production must be considered to combat the shortage of silicon materials and promote sustainable development. In particular, the loss of grade 4 N high-purity silicon in QCWA is a frustrating fact for the silicon supply chain. In this work, an electrical separation process is proposed for the recovery of silicon and quartz from QCWA to realize waste resource reutilization. The charging processes and forces in the feed QCWA are first analyzed. Then, the electric field distribution during electrical separation is simulated to clarify the movement models of silicon and quartz particles and formulate reasonable electrical separation parameters. After systematic theoretical analysis, calculation, and simulation, electrical separation experiments were conducted. The results prove that the content of silicon in the concentrate and the corresponding content of quartz in the tailing respectively exceeded 93 % and 61 % under a particle size of 80 ∼ 120 mesh, a voltage of 40 kV, and a roll speed of 75 r/min. This work demonstrates that electrical separation is a sustainable process that could be recommended for silicon and quartz recovery from QCWA.

中文翻译：

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通过电分离从石英坩埚废灰中回收硅和石英的可持续矿物工艺


在光伏产业爆发式发展的推动下，必须考虑对单晶硅棒生产中产生的石英坩埚废灰（QCWA）进行处理，以应对硅材料的短缺，促进可持续发展。特别是，QCWA 中 4 N 级高纯硅的损失对于硅供应链来说是一个令人沮丧的事实。在这项工作中，提出了一种电分离工艺，用于从QCWA中回收硅和石英，以实现废物资源的再利用。首先分析了 QCWA 进料中的充电过程和力。然后，对电分离过程中的电场分布进行模拟，以明确硅和石英颗粒的运动模型，制定合理的电分离参数。经过系统的理论分析、计算和仿真，进行了电分离实验。结果表明，在粒度为80～120目、电压为40 kV、辊速为75 r时，精矿中的硅含量和尾矿中相应的石英含量分别超过93 %和61 %。 /分钟这项工作表明，电分离是一种可持续的工艺，可推荐用于从 QCWA 中回收硅和石英。