Abstract This paper presents a novel method for the transformation of waste crystalline silicon, including waste polysilicon (photovoltaic industry), single crystal silicon (waste chip), and activated carbon (AC) into submicro β-SiC in timescales of minutes using a multimode microwave rotary tube reactor under open-air conditions. This research addressed the difficult problem of microwave sintering temperature measurement by using light conducted by a quartz tube wall. The synthesis underwent a liquid-solid reaction at 1450 ± 50 °C for 6–8 min, which is a noticeable improvement when compared to industrial processes, where a heating time of 30 h and temperatures of 2200–2400 °C are commonly needed. Theoretical calculations show that the new synthesis method for β-SiC consumes 4.1–4.8 times less energy than modern production methods using quartz sand (SiO 2 ) as the raw material, and CO 2 emission using this method is reduced by 76–79%.

中文翻译：

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低碳排放多模微波烧结废结晶硅转化为亚微米β-SiC

摘要 本文提出了一种使用多模微波在几分钟内将废多晶硅（光伏工业）、单晶硅（废芯片）和活性炭（AC）等废晶体硅转化为亚微米 β-SiC 的新方法。露天条件下的旋转管式反应器。这项研究解决了使用石英管壁传导的光进行微波烧结温度测量的难题。该合成在 1450±50°C 下进行了 6-8 分钟的液-固反应，与通常需要 30 小时的加热时间和 2200-2400°C 的温度的工业过程相比，这是一个显着的改进。理论计算表明，β-SiC 的新合成方法消耗 4.1-4。