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...

Examples

Embodiment 1

[0025] The silicon wafer waste powder was soaked in a mixed solution of ethanol and acetone with a volume ratio of 1:1, stirred for 20 min, filtered and rinsed with deionized water, and dried at 100 °C. Mix limestone powder, dried silicon wafer waste, and clay at a mass ratio of 1.4:0.1:0.3. After mixing evenly, put it into a reaction furnace and heat it. The heating rate is 10°C / min, heated to 800°C, and kept for 2 hours. , and then continue to heat to 1450 ° C, heat preservation for 2 hours. The sample was taken out, air-cooled to room temperature, and ground through a 80 μm square hole sieve to obtain cement clinker. Add water and stir, the water-cement ratio is 0.44, pour the cement slurry into a 4×4×16cm triple mold, vibrate and form, standard curing for 3 days, measure its compressive strength according to GB175-2017 after 28 days, and use glycerin— The ethanol method is used to determine the free calcium oxide content in cement according to GB / T12573, and the results a...

Embodiment 2

[0027] The silicon wafer waste powder was soaked in a mixed solution of ethanol and acetone with a volume ratio of 1:1, stirred for 20 min, filtered and rinsed with deionized water, and dried at 100 °C. Mix limestone powder, dried silicon chip waste, and clay at a mass ratio of 1.4:0.2:0.2. After mixing evenly, put it into a reaction furnace for heating. The heating rate is 10°C / min, heated to 900°C, and kept for 2 hours. . Then continue heating to 1450°C and keep the temperature for 2 hours. The sample was taken out, air-cooled to room temperature, and ground through a 80 μm square hole sieve to obtain cement clinker. Add water and stir, the water-cement ratio is 0.44, pour the cement slurry into a 4×4×16cm triple mold, vibrate and form, standard curing for 3 days, measure its compressive strength according to GB175-2017 after 28 days, and use glycerin— The ethanol method is used to determine the free calcium oxide content in cement according to GB / T12573, and the results a...

Embodiment 3

[0029] The silicon wafer waste powder was soaked in a mixed solution of ethanol and acetone with a volume ratio of 1:1, stirred for 20 min, filtered and rinsed with deionized water, and dried at 100 °C. Mix limestone powder, dried silicon wafer waste, and clay at a mass ratio of 1.4:0.15:0.25. After mixing evenly, put it into a reaction furnace and heat it. The heating rate is 10°C / min, heated to 850°C, and kept for 2 hours. . Then continue heating to 1450°C and keep the temperature for 2 hours. The sample was taken out, air-cooled to room temperature, and ground through a 80 μm square hole sieve to obtain cement clinker. Add water and stir, the water-cement ratio is 0.44, pour the cement slurry into a 4×4×16cm triple mold, vibrate and form, standard curing for 3 days, measure its compressive strength according to GB175-2017 after 28 days, and use glycerin— The ethanol method is used to determine the free calcium oxide content in cement according to GB / T12573, and the result...

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...

Examples

Embodiment 1

[0025] The silicon wafer waste powder was soaked in a mixed solution of ethanol and acetone with a volume ratio of 1:1, stirred for 20 min, filtered and rinsed with deionized water, and dried at 100 °C. Mix limestone powder, dried silicon wafer waste, and clay at a mass ratio of 1.4:0.1:0.3. After mixing evenly, put it into a reaction furnace and heat it. The heating rate is 10°C / min, heated to 800°C, and kept for 2 hours. , and then continue to heat to 1450 ° C, heat preservation for 2 hours. The sample was taken out, air-cooled to room temperature, and ground through a 80 μm square hole sieve to obtain cement clinker. Add water and stir, the water-cement ratio is 0.44, pour the cement slurry into a 4×4×16cm triple mold, vibrate and form, standard curing for 3 days, measure its compressive strength according to GB175-2017 after 28 days, and use glycerin— The ethanol method is used to determine the free calcium oxide content in cement according to GB / T12573, and the results a...

Embodiment 2

[0027] The silicon wafer waste powder was soaked in a mixed solution of ethanol and acetone with a volume ratio of 1:1, stirred for 20 min, filtered and rinsed with deionized water, and dried at 100 °C. Mix limestone powder, dried silicon chip waste, and clay at a mass ratio of 1.4:0.2:0.2. After mixing evenly, put it into a reaction furnace for heating. The heating rate is 10°C / min, heated to 900°C, and kept for 2 hours. . Then continue heating to 1450°C and keep the temperature for 2 hours. The sample was taken out, air-cooled to room temperature, and ground through a 80 μm square hole sieve to obtain cement clinker. Add water and stir, the water-cement ratio is 0.44, pour the cement slurry into a 4×4×16cm triple mold, vibrate and form, standard curing for 3 days, measure its compressive strength according to GB175-2017 after 28 days, and use glycerin— The ethanol method is used to determine the free calcium oxide content in cement according to GB / T12573, and the results a...

Embodiment 3

[0029] The silicon wafer waste powder was soaked in a mixed solution of ethanol and acetone with a volume ratio of 1:1, stirred for 20 min, filtered and rinsed with deionized water, and dried at 100 °C. Mix limestone powder, dried silicon wafer waste, and clay at a mass ratio of 1.4:0.15:0.25. After mixing evenly, put it into a reaction furnace and heat it. The heating rate is 10°C / min, heated to 850°C, and kept for 2 hours. . Then continue heating to 1450°C and keep the temperature for 2 hours. The sample was taken out, air-cooled to room temperature, and ground through a 80 μm square hole sieve to obtain cement clinker. Add water and stir, the water-cement ratio is 0.44, pour the cement slurry into a 4×4×16cm triple mold, vibrate and form, standard curing for 3 days, measure its compressive strength according to GB175-2017 after 28 days, and use glycerin— The ethanol method is used to determine the free calcium oxide content in cement according to GB / T12573, and the result...

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