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Comprehensive treatment method for waste liquid crystal display

A liquid crystal display and comprehensive treatment technology, applied in the field of waste resource treatment, can solve problems such as environmental pollution, mercury-containing fluorescent lamps, mercury leakage, etc., and achieve the effects of significant economic benefits, reduced interference, and reduced pollution

Active Publication Date: 2013-06-19
JIANGXI GREEN ECO MFG RESOURCE CYCLE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the fluorescent lamp in the backlight contains mercury. If it is accidentally broken during the disassembly process of the LCD display, it may cause mercury leakage and cause environmental pollution.

Method used

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  • Comprehensive treatment method for waste liquid crystal display

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Experimental program
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Effect test

Embodiment 1

[0032] A comprehensive treatment method for waste liquid crystal displays, comprising the following steps:

[0033] (1) Disassemble the discarded liquid crystal display, and remove the plastic parts, cables and liquid crystal glass box;

[0034] (2) Remove the polarizer from the liquid crystal glass box, mechanically peel off the glass substrate, and sell the waste polarizer to recycling manufacturers;

[0035] (3) dissolving the liquid crystal with ethanol under ultrasonic waves on the stripped glass substrate, the mass ratio of the added ethanol to the liquid crystal is 50-100:1, then fractionating the ethanol and the liquid crystal, collecting the liquid crystal, and recycling the ethanol;

[0036] (4) get the glass sheet not containing liquid crystal in step (3), scrape off the coating that contains indium oxide and tin dioxide, then make glass ceramics after the glass sheet is cleaned;

[0037] (5) Take 20g of the scraped coating, mix with 40g of ferric sulfate, roast at...

Embodiment 2

[0041] A comprehensive treatment method for waste liquid crystal displays, comprising the following steps:

[0042] (1) Disassemble the discarded liquid crystal display, and remove the plastic parts, cables and liquid crystal glass box;

[0043] (2) Remove the polarizer from the liquid crystal glass box, mechanically peel off the glass substrate, and sell the waste polarizer to recycling manufacturers;

[0044](3) dissolving the liquid crystal with diethyl ether under ultrasonic waves on the stripped glass substrate, the mass ratio of the added diethyl ether to the liquid crystal is 50 to 100: 1, then fractionating the diethyl ether and the liquid crystal, and collecting the liquid crystal, and recycling the diethyl ether;

[0045] (4) get the glass sheet not containing liquid crystal in step (3), scrape off the coating that contains indium oxide and tin dioxide, then make glass ceramics after the glass sheet is cleaned;

[0046] (5) Take 20g of the scraped coating, mix with ...

Embodiment 3

[0050] A comprehensive treatment method for waste liquid crystal displays, comprising the following steps:

[0051] (1) Disassemble the discarded liquid crystal display, and remove the plastic parts, cables and liquid crystal glass box;

[0052] (2) Remove the polarizer from the liquid crystal glass box, mechanically peel off the glass substrate, and sell the waste polarizer to recycling manufacturers;

[0053] (3) dissolving the liquid crystal with acetone under ultrasonic waves on the stripped glass substrate, the mass ratio of the added acetone to the liquid crystal is 50-100: 1, then fractionating the acetone and the liquid crystal, and collecting the liquid crystal, and recycling the acetone;

[0054] (4) get the glass sheet not containing liquid crystal in step (3), scrape off the coating that contains indium oxide and tin dioxide, then make glass ceramics after the glass sheet is cleaned;

[0055] (5) Get 20g of the scraped coating, mix 40g of ferric sulfate, roast at ...

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Abstract

The invention provides a comprehensive treatment method for a waste liquid crystal display, and the method comprises the steps of: (1) simply dismantling; (2) removing polarizers; (3) separating liquid crystal: using an organic solvent to dissolve the liquid crystal to separate the liquid crystal away from a glass substrate, and collecting the liquid crystal after distillation; (4) separating a glass sheet from a coating, wherein the glass sheet is made to be glass-ceramics after being washed; (5) recovering indium from the coating: mixing the scraped oxide coating with ferric sulfate, calcining in an oxidation atmosphere at a temperature of 500-600 DEG C, and then soaking in water to obtain a solution containing indium sulfate; after replacement, filtering to obtain indium with a purity of more than 95.6%, and returning filtrate B to water soaking; and dissolving residue A in sulfuric acid, filtering to obtain tin oxide in residue C, and filtrate C can be concentrated for crystallization to obtain ferric sulfate for calcination; (6) sorting plastic; and (7) sorting metal and nonmetal components by using electrostatic separation. According to the present invention, indium in liquid crystal displays can be completely recycled, and therefore integrated treatment and recycling of a waste liquid crystal display are obtained.

Description

technical field [0001] The invention relates to a treatment method for waste resources, in particular to a comprehensive treatment method for waste liquid crystal displays. Background technique [0002] Because of its high resolution and excellent display effect, as well as its small size and light weight, liquid crystal display has become the absolute mainstream product of computer monitors. With the replacement of liquid crystal display products, or the liquid crystal display products are scrapped due to failure, a large number of liquid crystal displays are eliminated and become waste products. The liquid crystal display consists of a glass panel, a circuit board, a power cord, a metal frame, a plastic casing and a base, and a backlight system. These components or parts contain a large number of recycled or recycled resources, such as metal, plastic, glass, etc. At the same time, the fluorescent lamp in the backlight source contains mercury. If it is accidentally broken...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00C22B7/00C22B58/00
CPCY02P10/20
Inventor 许开华张翔王勤苏陶贵吕志
Owner JIANGXI GREEN ECO MFG RESOURCE CYCLE
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