Method for resource recovery of silicon carbide component from crystal silicon cutting waste mortar

A technology of crystal silicon cutting and waste mortar, applied in the direction of lubricating composition, etc., can solve the problems of low resource recycling rate, insufficient engineering technology reserves, poor application performance of recycled products, etc., to reduce consumption, stabilize operation status, and reduce waste water The effect of emissions

Active Publication Date: 2013-05-15
JIANGSU JIAYU RESOURCE UTILIZATION
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  • Description
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Problems solved by technology

Most waste mortar recycling industries in China generally have insufficient engineering technology reserves, low resource recycling rate, and poor application performance of recycled products, especially the high proportion of process waste. certain secondary effects

Method used

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  • Method for resource recovery of silicon carbide component from crystal silicon cutting waste mortar

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Experimental program
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Effect test

Embodiment 1

[0026] 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.

[0027] 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 deliver...

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Abstract

The invention discloses a method for resource recovery of a silicon carbide component from crystal silicon cutting waste mortar. The method comprises the steps of homogenate, cyclone separation, filter-pressing separation, after treatment (mechanical separation, alkaline washing, acid washing, cleaning and drying) and the like. In the invention, as a homogenizing agent is adopted, consumption of dilution water is greatly reduced, and comprehensive objectives of realizing homogenate, reducing systematic viscosity and improving dispersity are achieved; based on the combination of the cyclone separation process and the filter-pressing separation process, a Si component in heavy-phase slurry is continuously carried into a light-phase suspension, so that discharge of waste water in the links of recycling and purifying the silicon carbide component is greatly reduced, and therefore discharge of pollutant is reduced; and according to the method disclosed by the invention, the resource recovery rate of the silicon carbide component from the crystal silicon cutting waste mortar can reach over 93%.

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 carbide components recovered from waste mortar can be reused for wire cutting processing of silicon materials after size classification. 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 in the world sinc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10M175/00C01B31/36
Inventor 刘来宝
Owner JIANGSU JIAYU RESOURCE UTILIZATION
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