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Silicon material cleaning method

A silicon material and pre-cleaning technology, which is applied in the direction of cleaning methods and appliances, chemical instruments and methods, silicon compounds, etc., can solve the problems of unstable cleaning quality and high cleaning cost, so as to avoid silicon material loss, improve cleaning quality, and improve The effect of utilization

Active Publication Date: 2016-07-13
NINGXIA LONGI SILICON MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a silicon material cleaning method, which solves the shortcomings of the existing chemical cleaning methods, such as unstable cleaning quality and high cleaning cost

Method used

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  • Silicon material cleaning method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A silicon material cleaning method provided by the present invention specifically includes the following steps:

[0031] Step 1) Collect the edge leather produced after being cut in a whole piece, put it into a washing bowl filled with water to scrub all its surfaces, and then transfer it to a container to dry;

[0032] Step 2) Put the dried edge leather into the sandblasting work box, and use silicon particles with an average particle size of 0.2mm-0.6mm as the medium to perform sandblasting to ensure that the surface of the edge leather is completely peeled off and transferred to a clean In the material box;

[0033] Step 3), transfer the sandblasted edge leather to a washing basin filled with pure water, and scrub all sides of the edge leather with a clean dust-free cloth;

[0034] Step 4), place the scrubbed edge material in an ultrasonic machine filled with pure water for ultrasonic cleaning. The ultrasonic cleaning time is 10 minutes and the temperature is 70°C;

[0035] S...

Embodiment 2

[0038] A silicon material cleaning method provided by the present invention specifically includes the following steps:

[0039] Step 1) Collect the edge leather produced after being cut in a whole piece, put it into a washing pot filled with water to scrub all its sides, scrub it and transfer it to the container to dry;

[0040] Step 2) Put the dried edge leather into the sandblasting work box, and use silicon particles with an average particle size of 0.2mm-0.6mm as the medium to perform sandblasting to ensure that the surface of the edge leather is completely peeled off and transferred to a clean In the material box;

[0041] Step 3), transfer the sandblasted edge leather to a washing basin filled with pure water, and scrub all sides of the edge leather with a clean dust-free cloth;

[0042] Step 4), the scrubbed edge material is placed in an ultrasonic machine filled with pure water for ultrasonic cleaning, the ultrasonic cleaning time is 12 minutes, and the temperature is 55°C;

[...

Embodiment 3

[0046] A silicon material cleaning method provided by the present invention specifically includes the following steps:

[0047] Step 1), collect the edge leather produced after being cut in one piece, put it into a washing basin filled with tap water to scrub all its surfaces, and then transfer it to a container to dry;

[0048] Step 2) Put the dried edge leather into the sandblasting work box, and use silicon particles with an average particle size of 0.2mm-0.6mm as the medium to perform sandblasting to ensure that the surface of the edge leather is completely peeled off and transferred to a clean In the material box;

[0049] Step 3), transfer the sandblasted edge leather to a washing basin filled with pure water, and scrub all sides of the edge leather with a clean dust-free cloth;

[0050] Step 4), the scrubbed edge material is placed in an ultrasonic machine filled with pure water for ultrasonic cleaning, the ultrasonic cleaning time is 15 minutes, and the temperature is 40°C;

[...

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Abstract

The invention discloses a silicon material cleaning method which comprises the steps of precleaning, sand blast, cleaning, ultrasonic cleaning, rinsing and drying. According to the silicon material cleaning method, the problems that an existing chemical cleaning method is instable in cleaning quality and high in cleaning cost are solved. 1. First sand blast is adopted and pure water is adopted for cleaning; in the industry, a silicon material is always subject to acid pickling, the technical prejudice of acid pickling is overcome, impurities and dirt on the cleaned silicon material are completely removed, and the requirements on silicon material cleanness for manufacturing solar single crystal silicon are met. 2. Pure water is used for the cleaning process, cleaned waste water is free of chemical reagents and can be directly discharged, and environmental pollution is reduced. 3. The whole silicon material is cleaned, silicon material loss caused by crushing prior to cleaning and the labor cost required for picking are avoided, and the silicon material utilization rate is improved. 4. The operation process is simple, the controllability is high, and the silicon material cleaning quality is effectively improved.

Description

Technical field [0001] The invention belongs to the technical field of solar silicon material cleaning, and specifically relates to a silicon material cleaning method. Background technique [0002] In the preparation process of solar-grade monocrystalline silicon, polycrystalline silicon is usually used as a raw material, and silicon is a non-renewable resource, and its storage capacity is limited. Therefore, in order to improve its utilization rate and save costs, monocrystalline silicon rods are currently drawn, cut, The silicon materials such as the slag cover, head and tail material, and side leather material produced during the square cutting process are reused, but the surface of this part of the silicon material will be polluted during the process of processing, transportation and storage. The main pollutants are organic matter, Oxide layer, metal ions, etc., to ensure the drawing quality of single crystal silicon rods, this part of the silicon material needs to be cleaned...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B08B7/04C01B33/037
Inventor 王雪峰陈立军
Owner NINGXIA LONGI SILICON MATERIALS
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