Polycrystalline silicon cutting waste material treatment method

The invention discloses a polycrystalline silicon cutting waste material treatment method, and relates to comprehensive utilization of resources. According to the method, a polycrystalline silicon cutting waste material is taken as a main raw material, is leached with an alkali solution, and is filtered so as to obtain a mixture of hydrogen, a sodium silicate solution, silicon carbide and iron directly. Specifically, the method comprises the following steps: within a temperature range of 20-95 DEG C, leaching the cutting waste material with a 5-15% sodium hydroxide (or potassium hydroxide) solution, after the leaching is completed, filtering, and separating the filtrate from the leached waste material, wherein Si in the waste material can react with the NaOH solution in the alkali leaching process to generate sodium silicate and hydrogen; the filtrate can be used for preparing sodium silicate or taken as a raw material for preparing white carbon black; the waste material obtained after alkali leaching comprises main components of Fe and SiC, and pure silicon carbide can be prepared after acid leaching separation of iron. The invention provides a technique for resource utilization of polycrystalline silicon cutting waste materials with low cost, valuable elements in the polycrystalline silicon cutting waste materials can be recycled to the maximum extent, and waste can be turned into wealth.