Silicon wafer waste powder solid waste treatment method and product thereof

Abstract

The invention discloses a silicon wafer waste powder solid waste treatment method and a product thereof. The method comprises the following steps of: taking silicon wafer waste powder as a siliceous raw material, performing cleaning with a mixed organic solvent of ethanol and acetone, then conducting cleaning with deionized water, and performing drying; mixing a limestone powder raw material, thedried silicon wafer powder and clay, carrying out heating treatment on the mixed material, taking out a sample, and performing cooling to room temperature; and grinding and sieving the material obtained in the step (2) to obtain the cement clinker obtained by solid waste treatment of the silicon wafer waste powder. The silicon wafer powder is simply pretreated to obtain the siliceous raw materialwith high purity and small granularity, so that the procedure of grinding the raw material in an earlier stage can be omitted, and the energy consumption is reduced; the prepared cement raw material can be effectively combined with CaO in the firing process, free CaO in cement is reduced, the compressive strength of the prepared cement raw material is high, and the content of free CaO is low.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a solid waste treatment method for silicon wafer waste powder, a product thereof and cement prepared therefrom. Background technique [0002] In the semiconductor industry, whether it is the cutting and grinding of silicon rods or the grinding of wafers in the packaging process, silicon powder waste will be generated. For silicon powder waste, there is no effective treatment method, and it is generally treated as solid waste. Tan Yi from Dalian University of Technology and others used diamond wire to cut photovoltaic materials—silicon wafers, and recycled the silicon wafer waste as lithium-ion negative electrode materials [CN108987677A]. Li Xiang from Jiangsu University preprocessed silicon wafer powder through high temperature Under the heating, made of SiC fiber material [CN111115634A]. Of course, for silicon powder waste, the chemical composition is simple Si, bu...

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Problems solved by technology

Of course, for silicon powder waste, the chemical composition is simple Si, but it will be oxidized to SiO in an alkaline environment. 2 , so the purity of elemental silicon in the waste is not very high, but the waste is essentially a siliceous raw material, and the siliceous raw material is used as the main raw material for firing cement. At present, there is no report about the use of silica fume waste as a cement raw material.

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