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Method for preparing crystalline silicon by using diamond wire cutting wastes of crystalline silicon

A diamond wire cutting and crystalline silicon technology, applied in crystal growth, polycrystalline material growth, chemical instruments and methods, etc., can solve the problem of less research on the utilization of diamond wire cutting waste, and achieve easy industrial production, short process, Easy to operate effect

Inactive Publication Date: 2018-03-02
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the published patents are about the recycling of mortar silicon carbide cutting waste, but there are few studies on the utilization of diamond wire cutting waste

Method used

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  • Method for preparing crystalline silicon by using diamond wire cutting wastes of crystalline silicon
  • Method for preparing crystalline silicon by using diamond wire cutting wastes of crystalline silicon
  • Method for preparing crystalline silicon by using diamond wire cutting wastes of crystalline silicon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A method for preparing crystalline silicon from diamond wire cutting waste of crystalline silicon is carried out in the following steps:

[0033] (1) The cutting waste is pickled to remove impurities, and the slurry obtained from the pickling is filtered, washed with water, and dried to obtain purified diamond wire cutting waste powder of crystalline silicon. The acid used for pickling and impurity removal is hydrochloric acid (HCl), and the pickling conditions are: acid concentration 5%, pickling temperature 90°C, pickling time 60min, solid-liquid ratio 1:10. During the pickling process, mechanical stirring is used to improve the pickling effect.

[0034] (2) Under the condition of not adding water and binder, the powder after pickling and purification is pressed into blocks by cold isostatic pressing. The pressure used for forming is 300MP, and the holding time is 200s. After forming of blocks.

[0035] (3) The above block is directly cast into an ingot once, and th...

Embodiment 2

[0038] A method for preparing crystalline silicon from diamond wire cutting waste of crystalline silicon is carried out in the following steps:

[0039] (1) The cutting waste is pickled to remove impurities, and the slurry obtained from the pickling is filtered, washed with water, and dried to obtain purified diamond wire cutting waste powder of crystalline silicon. The acid used for pickling and impurity removal is sulfuric acid (H 2 SO 4 ), the pickling conditions are: acid concentration 40%, pickling temperature 20°C, pickling time 30min, solid-liquid ratio 1:5. During the pickling process, mechanical stirring is used to improve the pickling effect.

[0040] (2) Mix 20% of water and 5% of binder into the powder after pickling and purification, mix evenly in the mixer, and then use cold isostatic pressing to form the material The briquette is formed under the conditions, the pressure used for forming is 200MP, and the holding time is 5s, and the formed block is obtained. ...

Embodiment 3

[0044] A method for preparing crystalline silicon from diamond wire cutting waste of crystalline silicon is carried out in the following steps:

[0045] (1) The cutting waste is pickled to remove impurities, and the slurry obtained from the pickling is filtered, washed with water, and dried to obtain purified diamond wire cutting waste powder of crystalline silicon. The acid used for pickling and impurity removal is hydrofluoric acid (HF), and the pickling conditions are: acid concentration 25%, pickling temperature 50°C, pickling time 300min, solid-to-liquid ratio 1:2. During the pickling process, mechanical stirring is used to improve the pickling effect.

[0046] (2) Mix 40% of water and 10% of binder into the powder after pickling and purification, mix evenly in the mixer, and then press the material under the conditions by molding Block forming, the pressure used for forming is 5MP, and the holding time is 300s to obtain the formed block.

[0047] (3) Blending the above...

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Abstract

The invention provides a method for preparing crystalline silicon by using diamond wire cutting wastes of crystalline silicon, and belongs to the technical field of recycling. The method concretely comprises the following steps: carrying out acid washing, purification and impurity removal on the diamond wire cutting wastes of crystalline silicon, and carrying out filtration, water washing and drying on the obtained slurry to obtain purified cutting waste powder; mixing the powder with appropriate amounts of water and a binder, performing uniform mixing in a mixer, carrying out briquetting molding on the mixed materials in a briquetting machine, and drying the molded mixture to obtain a dried block; and carrying out ingot casting on the block, cooling the obtained silicon ingot, and cuttingoff two ends to obtain the remaining middle part that is a crystalline silicon ingot with a required purity. The method has the advantages of short flow, low energy consumption, easiness in operation, and easiness in realization of industrial production. The method changes wastes into valuables, so the method has economic benefits, and also has important significance in the environmental protection level.

Description

technical field [0001] The invention relates to the technical field of secondary resource utilization, in particular to a method for preparing crystalline silicon from diamond wire cutting waste of crystalline silicon. Background technique [0002] At present, fossil energy still dominates the energy used in the world. However, its extensive use has brought many problems. On the one hand, the reserves of fossil energy such as coal, oil and natural gas are limited, and it is difficult to meet the increasing demand of human beings for energy; on the other hand, the use of fossil energy will cause serious environmental problems. Such as smog, acid rain, greenhouse effect, etc., endanger human health. Therefore, it is imperative to find renewable energy to replace fossil energy. Solar energy is considered to be one of the energy sources with development value because of its advantages such as non-pollution and inexhaustibility. The core material of solar power generation is c...

Claims

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Application Information

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IPC IPC(8): C30B11/00C30B28/06C30B29/06
CPCC30B29/06C30B11/00C30B28/06
Inventor 邢鹏飞魏冬卉孔剑金星都兴红冯忠宝
Owner NORTHEASTERN UNIV
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