The top-cut scraps of silicon ingots are a major source of waste in the production of polysilicon solar cells. In this study, purification of solar cell silicon scraps through chemical etching was carried out. Certain parameters, such as solvent types, etching temperature, ultrasonic power, and ultrasonic frequency were investigated. The optimal conditions were determined to be HF – H₂SO₄ – HNO₃ mixed acid, reaction temperature of 60 °C, ultrasonic frequency of 45 kHz and ultrasonic power of 240 W. Chemical analysis demonstrated that iron was removed. Inclusions were removed under the observation of a microscope. Results indicated that the solar-cell silicon scraps were purified at a low cost.

硅锭的顶部废料是多晶硅太阳能电池生产中的主要废物来源。在这项研究中，通过化学蚀刻对太阳能电池硅废料进行了提纯。研究了某些参数，例如溶剂类型、蚀刻温度、超声功率和超声频率。确定最佳条件为HF - H ₂ SO ₄ - HNO ₃混合酸，反应温度60 ℃，超声频率45 kHz，超声功率240 W。化学分析表明铁被去除。在显微镜下观察去除夹杂物。结果表明，太阳能电池硅废料的提纯成本较低。