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A method for recycling and reusing solar crystal silicon cutting waste slurry

A technology of waste slurry and crystalline silicon, which is applied in recycling technology, plastic recycling, liquid fertilizer, etc., can solve the problems of uncompetitiveness, achieve effective separation, improve fertilizer efficiency, and high purity

Active Publication Date: 2020-02-07
江苏美科太阳能科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its main active ingredient "soluble silicon" and other auxiliary materials are purchased directly, and are not competitive in terms of cost

Method used

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  • A method for recycling and reusing solar crystal silicon cutting waste slurry

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Embodiment 1

[0033] A method for recycling solar crystalline silicon cutting waste slurry, comprising the following specific steps:

[0034] S1. Put 100L monocrystalline silicon cutting waste slurry into a plate and frame filter press for physical pressure filtration, and collect the primary filtrate and primary filter residue respectively;

[0035] S2, obtain the primary filtrate containing the polyethylene glycol / water mixture, heat it, and obtain about 40 kg of polyethylene glycol after evaporating the water;

[0036] S3, dissolving the primary filter residue in water, adding 50 kg of potassium hydroxide, heating and stirring until the reaction is complete, and then carrying out physical secondary filtration, collecting the secondary filtrate and the secondary filter residue respectively;

[0037] S4, obtain the secondary filtrate containing potassium silicate, add humic acid 35kg in the secondary filtrate, and the pH value is adjusted to 8, then the secondary filtrate is evaporated and...

Embodiment 2

[0041] A method for recycling solar crystalline silicon cutting waste slurry, comprising the following specific steps:

[0042] S1. Put 100L polysilicon cutting waste slurry into a plate and frame filter press for physical pressure filtration, and collect the primary filtrate and primary filter residue respectively;

[0043] S2, obtain the primary filtrate containing the polyethylene glycol / water mixture, heat it, and obtain about 40 kg of polyethylene glycol after evaporating the water;

[0044]S3, dissolving the primary filter residue in water, adding 60 kg of potassium hydroxide, heating and stirring until the reaction is complete, and then carrying out physical secondary filtration, collecting the secondary filtrate and the secondary filter residue respectively;

[0045] S4, obtain the secondary filtrate containing potassium silicate, add humic acid 25kg in the secondary filtrate, and the pH value is adjusted to 10, then the secondary filtrate is evaporated and concentrate...

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Abstract

The invention discloses a method for recycling solar energy crystalline silicon cutting waste size and relates to the technical field of resource regeneration. The solar energy crystalline silicon cutting waste size comprises the following main ingredients: 40-50% of polyethylene glycol, 20-25% of silicon powder, 25-35% of silicon carbide and 2.5-3% of iron scraps. The method comprises the following steps: S1, filtering the crystalline silicon cutting waste size, and separating polyethylene glycol; S2, adding strong base into solid content after filtration, and filtering and washing after reaction is complete; S3, adding humic acid into filtrate, regulating pH value, and concentrating, to obtain liquid silicon fertilizer; S4, removing iron scraps out of filter residue; and S5, washing materials after impurities are removed, and drying to obtain high-purity silicon carbide. The method disclosed by the invention has the advantages that the crystalline silicon cutting waste size can be fully utilized, not only is potential threat of industrial solid waste solved, but also polyethylene glycol, silicon powder and silicon carbide are efficiently and economically separated, and the aim of recycling resource is realized.

Description

technical field [0001] The invention relates to the technical field of resource regeneration, in particular to a method for recycling and reusing solar crystal silicon cutting waste slurry. Background technique [0002] With the development of society, the photovoltaic industry represented by crystalline silicon solar cells has developed rapidly, and crystalline silicon slicing is one of the important links in the preparation of crystalline silicon solar cells. In this process, more than 45% of the silicon material Into the cutting fluid, forming cutting waste slurry, which cannot be used again. Therefore, how to effectively recycle the cutting waste slurry of crystalline silicon is of great significance for reducing the production cost of photovoltaic materials and saving resources. [0003] Since silicon powder and silicon carbide in the cutting waste slurry are extremely difficult to separate, many disposal methods are to mix the two together. For example, the Chinese i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/956C05G1/00C08J11/06C08L71/02
CPCC05D1/00C05G5/23C08J11/06C08J2371/02C05F11/02Y02P20/133Y02W30/62
Inventor 钱军吴明山刘明权
Owner 江苏美科太阳能科技股份有限公司
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