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A method for recycling waste liquid used in photovoltaic black silicon wafer production line

A recycling method and technology of black silicon wafers, which are applied in the field of solar photovoltaic power generation, can solve the problems of ineffective separation and reuse of materials, high processing costs, and high processing costs, so as to reduce the comprehensive operating cost of waste liquid treatment, avoid environmental pollution, and achieve high efficiency. The effect of using

Inactive Publication Date: 2020-05-26
SHANDONG JIANZHU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Black silicon production waste liquid is directly used as hazardous waste, and the treatment cost is very high, which is unbearable for enterprises
Simple neutralization and precipitation treatment, the materials cannot be effectively separated and reused, and a large amount of hazardous solid waste is also generated. The water needs further treatment and cannot be directly discharged, and the treatment cost is also high
At present, there is no effective treatment of waste liquid generated in the production of black silicon, efficient separation of materials, and reuse treatment methods at home and abroad.

Method used

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  • A method for recycling waste liquid used in photovoltaic black silicon wafer production line

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Effect test

Embodiment 1

[0048] see figure 1 , the embodiment of the present invention provides a rotating electrode used in electrolysis in the waste liquid recovery method, the rotating electrode includes a central electrode column 1, the upper end of the central electrode column 1 is fixedly connected to a motor, and the periphery of the central electrode column 1 near the lower end is provided with Several layers of electrode mesh circles 2, each layer of electrode mesh circles 2 are surrounded by porous metal mesh, and the porous metal mesh is radially folded into several corners;

[0049] The central electrode column 1 and the electrode mesh coil 2 are fixedly connected by several layers of support beams arranged from bottom to top. Each layer of support beams is composed of a number of radially arranged support ribs 3. The corners are fixedly connected, and the other end of the support rib 3 is fixedly connected to the outer wall of the central electrode column 1 .

[0050] The central electro...

Embodiment 2

[0055] Embodiments of the present invention provide a method for recovering metallic silver in silver-containing waste liquid by using black silicon chip pore expansion waste liquid, the recovery method comprising the following steps:

[0056] Step 1. Waste liquid collection and mixing: collect silver-containing waste liquid, and add black silicon chip pore-expanding waste liquid to the silver-containing waste liquid to obtain a mixed solution, and use the black silicon chip pore-expanding waste liquid to adjust the pH value of the mixed solution to 1 -2;

[0057] Step 2, electrolytic recovery of silver metal: the mixed solution in the first step is electrolyzed using the electrode provided in embodiment 1 to obtain silver metal, and the electrolysis reaction is as follows:

[0058] Ag + +e → Ag.

[0059] The main components of the silver-containing waste liquid are ammonia and [Ag(NH 3 ) 2 ] + .

[0060] The hole-enlarging waste liquid mainly includes a mixed liquid wit...

Embodiment 3

[0062] The embodiment of the present invention provides a waste liquid recovery method for a photovoltaic black silicon wafer production line, the waste liquid includes the silver-containing waste liquid produced in the desilvering process and the hole-enlarging waste liquid produced in the hole-enlarging process; the recovery method is specifically :

[0063] The first step, waste liquid collection and mixing: the silver-containing waste liquid and the hole-enlarging waste liquid are collected into a mixing tank, wherein the volume ratio of the silver-containing waste liquid and the hole-enlarging waste liquid is: 1 : (1~1.2); Utilize the pore expansion waste liquid to adjust the pH value of the mixed solution to 1-2, release free silver ions, and the main reaction after mixing is:

[0064] [Ag(NH 3 ) 2 ] + +2H + → Ag + +2NH 4 +

[0065] NH 3 +H + →NH 4 + ;

[0066] The second step, electrolytic recovery of silver metal: the mixed solution in the first step is ut...

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Abstract

The invention discloses a recycling method for metal silver in sliver-containing waste liquor by utilizing black silicon piece reaming waste liquor and a waste liquor recycling method for a photovoltaic black silicon piece production line comprising two kinds of waste liquor, and provides a rotary electrode used during waste liquor electrolysis. The recycling method for silver-containing waste liquor and strong acid waste liquor and the waste liquor recycling method for the photovoltaic black silicon piece treatment waste liquor comprising two kinds of waste liquor realize recycling noble metal silver in waste liquor, so that elemental sliver, calcium fluoride with co-production purity being 80-85%, calcium nitrate with purity being 90-95%, and ammonia water with concentration being 20%-30% are obtained; and evaporated water and prepared ammonia water can be recycled for producing, so that efficient utilization for materials in waste liquor is realized, and therefore, comprehensive operation cost of waste liquor treatment can be reduced, and environmental pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of solar photovoltaic power generation, in particular to a method for recycling waste liquid used in a photovoltaic black silicon wafer production line. Background technique [0002] Solar conversion materials are still dominated by monocrystalline silicon and polycrystalline silicon materials. Monocrystalline silicon has the outstanding advantage of high photoelectric conversion efficiency and continues to occupy a dominant position in solar energy products. However, the high cost of monocrystalline silicon materials and limited production capacity affect their further promotion. Polysilicon has advantages in price and resources, especially when diamond wire cutting is used instead of traditional sand wire cutting. The speed of diamond wire cutting is faster, the quality of cut silicon wafers is more stable, and the cost of silicon wafers can be significantly reduced. However, diamond wire cutting polysilic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B7/00C01F11/22C01F11/38C01C1/02C01D3/06
CPCC01C1/022C01D3/06C01F11/22C01F11/38C01P2006/80C22B11/046
Inventor 冯立明刘林华姜言森韩玉杰王琦高君庆
Owner SHANDONG JIANZHU UNIV