There are few study examples on the separation of metals by floating method. In this study, separation of silicon and aluminum, which are the main components of silicon-based solar cell module, was carried out by floating method in order to purify silicon from waste solar cell module. The selection of surfactant, control of electric charge, wettability of the solid particles, surface tensions, and bubble surface area are important for separation of solids by floating method. Sodium dodecyl sulfate (SDS) can increase the hydrophobicity of aluminum powder due to the difference of surface potentials between silicon and aluminum. SDS behaves as a collector of aluminum as well as a frothing agent to decrease the bubble size. At a SDS concentration of 2 g/L and sample dipping time of 10 min, 80.1 mass% of aluminum was floated and separated, and the sedimentary silicon reached a purity of 90.7% from a mixture of 50 mass% aluminum and 50 mass% silicon. Finally, at a pH value of 7.0, SDS concentration between 1.0 and 2.5 g/L and air flow rate of 2.5 L/min (STP) were suitable experimental conditions to purify silicon from a mixture of silicon and aluminum by flotation separation method.

中文翻译：

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浮选法分离碎碎的硅基废太阳能电池中所含的硅粉和铝粉

浮法分离金属的研究实例很少。在这项研究中，通过浮法分离硅和铝是硅基太阳能电池组件的主要成分，以从废太阳能电池组件中纯化硅。表面活性剂的选择，电荷的控制，固体颗粒的润湿性，表面张力和气泡表面积对于通过浮法分离固体是重要的。由于硅和铝之间的表面电势差，十二烷基硫酸钠（SDS）可以增加铝粉的疏水性。SDS充当铝的集电器以及起泡剂，可减小气泡尺寸。在2 g / L的SDS浓度和10分钟的样品浸入时间下，漂浮并分离了80.1质量％的铝，从50质量％的铝和50质量％的硅的混合物中沉积的硅的纯度达到90.7％。最后，在pH值为7.0时，SDS浓度在1.0和2.5 g / L之间，空气流速为2.5 L / min（STP）是通过浮选分离法从硅和铝的混合物中提纯硅的合适实验条件。