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A kind of recycling method of waste flat display screen

A recycling method and display screen technology, applied in the direction of grain processing, process efficiency improvement, etc., to achieve the effect of reducing pollution, simplifying the process, and improving recovery rate

Active Publication Date: 2020-07-03
四川长虹智能制造技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies in the above-mentioned technologies, and propose a recycling method for waste flat panel display screens, aiming at solving the problem of recycling waste flat panel display screens

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The method for recycling waste flat panel display screens described in this embodiment includes the following steps:

[0028] (1) Obtain 1cm wide strips after the waste display screen is broken;

[0029] (2) Rolling the strips to break the glass adhered to the polarizer. In this embodiment, a pair of staggered gear rollers are used to roll the strips;

[0030](3) carry out acid leaching treatment with the product after step (2) treatment, filter and obtain pickling solution and pickling residue, wherein during the acid leaching treatment, the acid leaching solution adopts the sulfuric acid solution that the volume concentration is 10%, the acid leaching temperature 50℃, soaking time 4h;

[0031] (4) Filter the acid dipping solution in the step (3) after adjusting the pH of the pickling solution to 2.0, the filter residue tin hydroxide is reclaimed as a chemical raw material, the filtrate is extracted, electrowinning, and the metal indium is separated and recovered, whe...

Embodiment 2

[0035] The method for recycling waste flat panel display screens described in this embodiment includes the following steps:

[0036] (1) Obtain 3cm wide strips after breaking the waste display screen;

[0037] (2) Rolling the strips to break the glass adhered to the polarizer. In this embodiment, a pair of staggered gear rollers are used to roll the strips;

[0038] (3) carry out acid leaching treatment with the product after step (2) treatment, filter and obtain pickling solution and pickling residue, wherein during the acid leaching treatment, the acid leaching solution adopts the sulfuric acid solution that volume concentration is 20%, the acid leaching temperature 50℃, soaking time 2h;

[0039] (4) the pickling solution in step (3) is extracted, electrolyzed, and separated and recovered metal indium and tin, wherein the extract solution used is P 2 0 4 , the extraction conditions are: adjust the pH of the pickling solution to 2.0 and then filter, and the filter residue ...

Embodiment 3

[0043] The method for recycling waste flat panel display screens described in this embodiment includes the following steps:

[0044] (1) Obtain a 5cm wide strip after breaking the waste display screen;

[0045] (2) Rolling the strips to break the glass adhered to the polarizer. In this embodiment, a pair of staggered gear rollers are used to roll the strips;

[0046] (3) Carry out acid leaching treatment by the product after step (2) treatment, filter and obtain pickling solution and pickling residue, wherein during pickling treatment, the pickling solution adopts the sulfuric acid solution that volume concentration is 15%, the pickling temperature 60℃, soaking time 5h;

[0047] (4) the pickling solution in step (3) is extracted, electrolyzed, and separated and recovered metal indium and tin, wherein the extract solution used is P 2 0 4 , the extraction conditions are: adjust the pH of the pickling solution to 2.1 and then filter, and the filter residue is recovered as tin ...

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Abstract

The invention provides a resource regeneration recycling method of waste flat panel display screens. The resource regeneration recycling method comprises the following steps that (1) the waste flat panel display screens are smashed to obtain strips with the width of 1-10 cm; (2) the strips are rolled, so that glass adhered to polarizers are broken; (3) products after treatment in the step (2) aresubjected to acid leaching treatment, filtering is carried out, and thus an acid leaching solution and acid leaching residues are obtained; (4) the acid leaching solution in the step (3) is subjectedto extraction, zinc displacement and electrolysis, and metal indium and metal tin are separated and recycled; and (5) an alkaline solution is added into the acid leaching residues in the step (3) forheating soaking, separation is carried out to obtain a waste alkaline solution and residues, and the residues are subjected to separation treatment of glass fragments and the polarizers. According tothe resource regeneration recycling method of the waste flat panel display screens provided by the invention, metal components of the indium and the tin and the components of the glass and the plasticpolarizers in the waste display screens can be recycled separately, and the recycling rate of each component can be increased; and the process is simple, and the method is suitable for scale production.

Description

technical field [0001] The invention belongs to the field of recycling waste display screens, and in particular relates to a recycling method for waste flat screen displays. Background technique [0002] Indium is a rare metal, mainly mineral companions, so its output is greatly limited, but indium has extremely high value and has important uses in transparent electrodes, high-grade bearings, semiconductor materials, alloys, etc. my country is the world's most important producer of primary indium. The annual output of indium is about 400 tons, and about 90% is primary indium. Indium tin oxide (ITO) thin films are transparent to visible light and have good electrical conductivity, so they are widely used in industry, especially in liquid crystal displays. In my country, the consumption of indium on flat panel displays accounts for about 80% of the consumption of indium. Therefore, the regeneration and utilization of indium is of great significance. [0003] Since 2006, sal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B25/06C22B58/00B02C23/08
CPCB02C23/08C22B7/006C22B7/007C22B25/04C22B25/06C22B58/00Y02P10/20
Inventor 徐军潘晓勇陈正彭玲韦泽平
Owner 四川长虹智能制造技术有限公司
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