由於太陽能產業日漸蓬勃的發展，矽晶圓的產能也日漸提高，同時也會形成更多切削矽泥。切削矽泥的產生是來自於矽晶圓的切割過程所產生的廢棄物，組成主要是矽、碳化矽、金屬粒子與醇類水溶液。
目前環保署的統計，每年約有2萬公噸的切削矽泥產生，而切削矽泥的處理方式是以焚化及掩埋為主。由於切削矽泥的組成主要是由碳化矽及矽，因此如果可以將切削矽泥中的碳化矽及矽有效的回收並且再利用，即可建立起切削矽泥的資源循環。
切削矽泥分選方式，主要可分為物理法、化學法及浮選。物理分選主要是以重力、離心、電泳法為主，化學分選主要是以酸溶浸漬為主，浮選法分選主要是以顆粒表面的親、疏水性做為分選方法。本研究利用浮選法分選切削矽泥中的碳化矽及矽，在浮選的過程中探討礦漿濃度、氧化還原電位等浮選條件，提高切削矽泥。由本研究的結果可以得知，當礦漿條件為1：5，粗選礦漿電位為-400mV，氫氟酸濃度為0.8M，氣體條件為氮氣，精選礦漿電位為300mV，氫氟酸濃度為0.6M，氣體條件為氮氣且增加活性劑氟化鈉為最佳化條件浮選，切削矽泥經浮選所獲得之沉礦碳化矽純度為98.2%及浮礦矽純度為71.5%。

The growth of the solar energy industry has resulted in increasing wafer production. Wafers are primarily cut using silicon ingot crystal, wire saw, silicon carbide (SiC), and slurry. After cutting and processing, approximately 50% of the wafers become waste silicon slurry, which is composed of silicon, SiC, metal particles, and alcohol aqueous solution.
According to statistics from Taiwan’s Environmental Protection Administration, approximately 20,000 tons of waste silicon slurry is produced each year, the majority of which is incinerated or buried. The mainly components of waste silicon slurry are SiC and Si; therefore, if these components could be effectively recycled and reuse, a resource cycle from waste silicon slurry could be established.
Methods for separating waste silicon slurry include physical, chemical, and flotation methods. Physical separation mainly comprises using gravity, centrifuge, and electrophoresis; chemical separation requires soaking the waste silicon slurry in acid solution; and flotation separation utilizes the particle surface hydrophilicity and hydrophobicity. In this study, the flotation method was employed to separate SiC and Si from waste silicon slurry. During the flotation process, the flotation criteria were examined to increase the recycle rate of SiC and Si, including pulp density and oxidation reduction potential. The results revealed the optimal conditions for using the flotation method to separate waste silicon slurry, which resulted in a SiC grade of 98.2% and a Si grade of 71.5%.

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