Method for recycling waste LCD (liquid crystal display) panels

A resourceful, panel-based technology, applied in waste treatment, solid waste removal, etc., can solve the problems of complex LCD panel manufacturing process, waste, and complex processing process, and achieve easy industrialization, low cost of recycling equipment, and simple processing process Effect

Inactive Publication Date: 2013-07-10
HEFEI UNIV OF TECH
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the complex manufacturing process of the LCD panel, there are many types of metals contained, and the acid resistance of each metal is different, resulting in incomplete removal of the metal coating on the surface of the glass substrate, which is not conducive to the recycling and reuse of the glass substrate; moreover, there are many types of acids used, and No recovery of acid liquid, resulting in secondary pollution and waste of resources
[0005] The invention patent with the application number of 201110105636.9 discloses a method for recycling liquid crystal display glass substrates. In this method, LCD panels are divided into those containing resin black matrix, those containing chromium black matrix and those without matrix, and the processing technology is complicated and insufficient. cost-effective

Method used

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  • Method for recycling waste LCD (liquid crystal display) panels

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Effect test

Embodiment 1

[0024] see figure 1 , the waste LCD panel recycling method in the present embodiment is carried out according to the following steps:

[0025] a. Soak the LCD panel in industrial pure acetone for 13 hours at a temperature of 50°C. Most of the upper polarizer 9 and the lower polarizer 11 in the LCD panel will fall off automatically, and the remaining polarizers will be removed manually with a brush to obtain LCD core without polarizer;

[0026] b. Dry the LCD core and break it into glass fragments with a diameter of less than 15 mm and the surface of which is stained with liquid crystal 7. Wash for 10 minutes to dissolve the liquid crystals on the surface of the glass shards stained with liquid crystals in industrial pure acetone to obtain a liquid-solid mixture; filter the liquid-solid mixture to obtain pretreated glass shards without liquid crystals and a solution containing liquid crystals respectively. The solution containing liquid crystals is passed through a SY-2000 ty...

Embodiment 2

[0030] In this embodiment, the waste LCD panel recycling method is carried out according to the following steps:

[0031] a. Soak the LCD panel in industrial pure toluene at 35°C for 18 hours, most of the upper polarizer 9 and the lower polarizer 11 in the LCD panel will fall off automatically, and the remaining polarizers will be removed manually with a brush to obtain LCD core without polarizer;

[0032] b. Dry the LCD core and break it into glass fragments with a diameter of less than 15 mm and the surface is stained with liquid crystal 7. Place the glass fragments stained with liquid crystal in industrial pure chloroform, and use ultrasonic waves with a frequency of 50KHz and a power of 100W Wash for 12 minutes to dissolve the liquid crystals on the surface of the glass shards stained with liquid crystals in industrial pure chloroform to obtain a liquid-solid mixture; filter the liquid-solid mixture to obtain pretreated glass shards without liquid crystals and a solution c...

Embodiment 3

[0036] In this embodiment, the waste LCD panel recycling method is carried out according to the following steps:

[0037]a. Soak the LCD panel in industrial pure chloroform at 25°C for 24 hours, most of the upper layer polarizer 9 and the lower layer polarizer 11 in the LCD panel will fall off automatically, and the remaining polarizers will be removed manually with a brush to obtain LCD core without polarizer;

[0038] b. Dry the LCD core and break it into glass fragments with a diameter of less than 15 mm and the surface is stained with liquid crystal 7. Place the glass fragments stained with liquid crystal in industrial pure toluene, and use ultrasonic waves with a frequency of 50KHz and a power of 80W Wash for 10 minutes to dissolve the liquid crystals on the surface of the glass shards stained with liquid crystals in commercially pure toluene to obtain a liquid-solid mixture; filter the liquid-solid mixture to obtain pretreated glass shards without liquid crystals and a s...

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Abstract

The invention relates to a method for recycling waste LCD (liquid crystal display) panels. The method is characterized by comprising the following steps of: removing an upper layer of polaroids and a lower layer of polaroids on the LCD panel with an organic solvent; crushing left LED panel core into glass fragments with liquid crystal stuck on the surface; then putting into the organic solvent for dissolving the liquid crystal through ultrasonic; respectively obtaining pretreated glass fragments without liquid crystal and a solution with liquid crystal through filtering; separating the liquid crystal from the solution with liquid crystal through a distillation manner; soaking the pretreated glass fragments into a hydrofluoric acid solution; obtaining a solution containing indium and clean glass fragments through filtering, wherein the clean glass fragments are the glass substrate fragments of an upper layer of glass substrate and a lower layer of glass substrate; aerating the solution containing indium into a hydrofluoric acid evaporator for drying through evaporating; and obtaining a solid product rich in indium. The method realizes recycling of the waste LCD panels, is simple and thorough in recycling, and does not cause secondary pollution.

Description

technical field [0001] The invention relates to a waste recovery method, in particular to a waste LCD panel recycling method. Background technique [0002] Liquid crystal display has quickly become a hot spot in the market due to its advantages such as low energy consumption, bright colors, no flicker, no radiation, small size, light weight, and easy portability. With the rapid development of liquid crystal display technology, the manufacturing cost of liquid crystal display continues to decrease, and it is gradually replacing traditional CRT display screens at present, and is widely used in various display devices such as computers, televisions, and mobile phones. [0003] LCD panel is the core component of liquid crystal display, its manufacturing process is complicated, the pass rate is quite difficult to control, and the defective rate is as high as 30%-40%. Such a high defective rate, and a large number of discarded liquid crystal displays have become an important part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
CPCY02W30/20
Inventor 刘志峰赵凯王玉琳陈方秋蒋浩
Owner HEFEI UNIV OF TECH
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