Method for preparing photovoltaic silicon blade materials used for line cutting

A technology of photovoltaic silicon and wire cutting, which is applied in the field of preparation of online cutting photovoltaic silicon blades, can solve the problems of reducing the cost of cutting blades, limited purity, long production cycle, etc., and achieves improved cutting efficiency and service life, and strong adjustability , the effect of simple method

Active Publication Date: 2011-02-16
PINGDINGSHAN YICHENG NEW MATERIAL
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  • Summary
  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0002] At present, silicon carbide micropowder after purification and grading treatment is widely used as cutting material in wire cutting and grinding of photovoltaic silicon materials. However, ordinary silicon carbide micropowder cannot be used for cutting and grinding without treatment. The traditional treatment process is mainly based on primary classification of gas crushing, secondary classification of water medium and drying. The production cycle is long, and the purity of the produced products is limited and the particle size is not concentrated. It needs to consume a large amount of water and various acid-base reagents, which has a serious impact on the environment. It is a typical high-pollution, high-energy-consuming production process, which is not conducive to economic and environmental development. Lower material cutting efficiency and service life
For example: Chinese patent: special cutting edge material for wire cutting of semiconductor materials, application number: 200610018021.1, its production process has the following disadvantages: First, due to technological limitations, high-purity silicon carbide is used as raw material, which greatly reduces the cutting edge material. cost; second, the products dried by microwave drying are easy to agglomerate, the product fluidity is very poor, and the performance is greatly reduced; third, the use of airflow crushing and airflow preliminary classification has the following disadvantages: after crushing, it has not passed pretreatment In the link, there are impurities in the broken particles, and the preliminary classification of the airflow cannot achieve the classification effect of 4-20 μm described in the comparison document in the actual classification, and the particle size is mixed, which seriously affects the cutting efficiency of silicon carbide as a blade; Its four, in this method, there is no treatment of waste water after classification, therefore causing a large amount of waste water to seriously pollute the environment, its five, in the traditional homogenization process, the products of different batches that will be classified are directly mixed, here, before mixing, there is no Reasonable proportioning of particle size and particle shape, resulting in greatly reduced product service life and cutting efficiency after homogenization

Method used

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preparation example Construction

[0030] A preparation method for wire-cut photovoltaic silicon blade material, using silicon carbide block and silicon carbide sand as raw materials, and making products after crushing, purification, grading, drying, proportioning and mixing, the steps are as follows:

[0031] Step 1. Select 0-30mm silicon carbide sand or silicon carbide block, and crush until the particle size is less than 30 μm;

[0032]Step 2: Take 100 kg of fine powder pulverized in step 1, put it into the mixing tank, add 200-500 kg of deionized water, start the machine and stir until it is uniform, the stirring speed is 40-100rpm, and then add the total weight of the mixed slurry to 0.01 %-0.5% foaming agent, stir until uniform, then put a magnet in the mixing tank to remove iron impurities in the slurry, and then remove the foam on the surface of the slurry, so that there is no foam on the surface of the slurry and no deposition on the surface of the magnet until the iron impurities are removed, take out...

Embodiment 1

[0048] The present invention relates to a preparation method for wire-cut photovoltaic silicon blades, the specific steps of which are as follows:

[0049] Step 1. Use 0-30mm silicon carbide block as the raw material, pour it into the feeding port of the Raymond Mill, and finely pulverize the raw material until the particle size is less than 30 μm, and set aside;

[0050] Step 2: Take 100 kg of the pulverized micropowder in step 1, put it into a mixing tank, add 200 kg of deionized water, start the machine and stir until it is even, the stirring speed is 40rpm, and then add 0.01% of the total weight of the mixed slurry Twelve Sodium alkylbenzene sulfonate, stir until it is uniform, then put a magnet in the stirring tank to remove iron impurities in the slurry, and then remove the foam on the surface of the slurry until there is no foam on the surface of the slurry and no sediment on the surface of the magnet , because carbon and some other small impurities (such as: thin rope ...

Embodiment 2

[0060] The present invention relates to a preparation method for wire-cut photovoltaic silicon blades, the specific steps of which are as follows:

[0061] Step 1. Use 0-30mm silicon carbide sand as the raw material, pour it into the feeding port of the jet mill, and finely pulverize the raw material until the particle size is less than 30 μm, and set aside;

[0062] Step 2: Take 100 kg of the pulverized micropowder in step 1, put it into a mixing tank, add 300 kg of deionized water, start the machine and stir until it is even, the stirring speed is 60rpm, and then add 0.15% of the total weight of the mixed slurry quaternary amine Salt, stir until it is uniform, and then put a magnet in the mixing tank to remove iron impurities in the slurry, and then remove the foam on the surface of the slurry, so that there is no foam on the surface of the slurry and no deposits on the surface of the magnet. Due to carbon and some Other small impurities (such as: thin rope ends, hair, wood ...

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Abstract

The invention relates to a method for preparing photovoltaic silicon blade materials used for line cutting, comprises the following concrete steps of: 1. fine crushing: crushing silicon carbide raw materials; 2. chemical treatment: removing impurities by adopting deionized water and foaming agents; 3. standing treatment; 4. fine grading; 5. drying treatment; and 6 mixing and proportioning, wherein in the mixing and proportioning step, firstly, different batches are sorted after being detected according to particle shapes, rhombic granular materials and ball-shaped granular materials are mixed according to a mass ratio of 1 / 2, and packing is carried out after the sieving treatment. The invention has simple production process, can not cause any pollution on environment, in addition, the fine powder of the finely processed silicon carbide has high purity and concentrated granularity, the cutting efficiency can be improved, and the service life can be prolonged.

Description

technical field [0001] The invention relates to a photovoltaic silicon blade material for wire cutting, in particular to a preparation method for wire cutting photovoltaic silicon blade material. Background technique [0002] At present, silicon carbide micropowder after purification and grading treatment is widely used as cutting material in wire cutting and grinding of photovoltaic silicon materials. However, ordinary silicon carbide micropowder cannot be used for cutting and grinding without treatment. The traditional treatment process is mainly based on the primary classification of gas pulverization, the secondary classification of water medium and drying. The production cycle is long, and the purity of the produced products is limited and the particle size is not concentrated. It needs to consume a large amount of water and various acid-base reagents, which has a serious impact on the environment. It is a typical high-pollution, high-energy-consuming production process...

Claims

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Application Information

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IPC IPC(8): C01B31/36
Inventor 孙毅曲丽伟杨正宏
Owner PINGDINGSHAN YICHENG NEW MATERIAL
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