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Method for realizing resource recycling of silicon powder components in waste mortar from crystalline silicon cutting

A technology of crystalline silicon cutting and waste mortar, which is applied in the direction of silicon, silicon carbide, carbide, etc., can solve the problems of long distance to form an industrial scale, achieve stable operation status, reduce the amount of pollutants, and reduce the amount of wastewater discharge. Effect

Active Publication Date: 2013-06-05
JIANGSU JIAYU RESOURCE UTILIZATION
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Problems solved by technology

At present, the above-mentioned technologies are still far away from industrial application and the formation of industrial scale.

Method used

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  • Method for realizing resource recycling of silicon powder components in waste mortar from crystalline silicon cutting

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Experimental program
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Effect test

Embodiment 1

[0025] A batch of crystalline silicon cutting waste mortar from Jiangxi LDK Solar High-tech Co., Ltd. was taken. The components of the waste mortar were tested as follows: cutting fluid component 42.0%, silicon carbide component 39.0%, silicon component 10.0% of water, 5.0% of water, 1.8% of metal components, 2.2% of pigments and cross-linked macromolecular substances.

[0026] Pour 10 tons of the above crystalline silicon cutting waste mortar into the mixing tank, add 500Kg Pingpingjia O-25, 10 tons of water; turn on the stirring and heating device, the stirring speed is 80r / min, raise the temperature to 60°C and keep it warm; the time for homogenization and stirring 2 hours. Transport the above-mentioned homogenized mortar material to the FXJ-50 cyclone separator in the form of continuous feeding, keep the cyclone separation temperature at 60°C and keep it warm, start the cyclone separator for 15 minutes, and start to The overflow port collects the light phase suspension. ...

Embodiment 2

[0032] Take a batch of crystalline silicon cutting waste mortar produced by Suzhou GCL Photovoltaic Technology Co., Ltd. After testing, the waste mortar components are as follows: cutting fluid component 40.7%, silicon carbide component 38.4%, silicon component 11.3% , 5.5% water, 1.9% metal components, 2.2% pigments and cross-linked macromolecular substances.

[0033] Pour 20 tons of the above crystalline silicon cutting waste mortar into the mixing tank, add 900Kg emulsifier OP-10, 15 tons of water; turn on the stirring and heating device, the stirring speed is 70r / min, raise the temperature to 55°C and keep it warm; 2.5 hours. Transport the above-mentioned homogenized mortar material to the FXJ-75 cyclone separator in the form of continuous feeding, keep the cyclone separation temperature at 55°C and keep it warm, start the cyclone separator for 25 minutes, and start The overflow port collects the light phase suspension. The above-mentioned light-phase suspension is trans...

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Abstract

The invention discloses a method for realizing resource recycling of silicon powder components in waste mortar from crystalline silicon cutting. The method includes homogenate, cyclone separation, filter-press separation, aftertreatment (acid pickling, solvent washing and drying) of solid materials and the like. Homogenizing agent is adopted in process of the method, usage of dilute water is greatly reduced, and comprehensive purposes of homogenate, reduction of viscosity of a system and improved dispersion are achieved. The process of the method is based on matching of cyclone separation process and filter-press separation process, circulation supplementation of filter-press filter liquor is obtained by light-phase suspension, a separation effect of cyclone of fluid is sufficiently utilized, and accordingly, silicon powder components in heavy-phase mortar materials are continuously carried into the light-phase suspension so as to be recycled. Resource recycling rate of the silicon powder components in the waste mortar from crystalline silicon cutting can reach 88% at least.

Description

technical field [0001] The invention relates to a method for resource recovery of crystal silicon cutting waste mortar, in particular to a method for resource recycling of silicon carbide components from crystal silicon cutting waste mortar. Its application fields are mainly the recycling and utilization of waste mortar from crystal silicon cutting in the photovoltaic industry and waste mortar from crystal silicon cutting in the electronics industry. In the present invention, the silicon powder component recovered from waste mortar can be further purified to obtain high-purity silicon material, which has wide industrial application value. Background technique [0002] Silicon wafers are an important foundation for the development of the solar industry. With the rapid development of the global solar energy industry, the demand and processing volume of silicon wafers are increasing. According to industry statistics, China's silicon wafer production capacity has ranked first ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/02C01B31/36C01B32/956
Inventor 刘来宝
Owner JIANGSU JIAYU RESOURCE UTILIZATION
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