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Comprehensive recycle treatment method of waste liquid crystal display (LCD) secondary resources

A liquid crystal display and recycling technology, which is applied in the field of comprehensive recycling and processing of secondary resources of waste liquid crystal displays, can solve the problems of unrecyclable acid leaching solution, high corrosiveness and high cost, and is conducive to harmless treatment, improving Leaching rate, significant effect

Active Publication Date: 2015-07-08
HUNAN TONGLI ELECTRONICS WASTE RECOVERING DISSEMBLING & UTILIZATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic and foreign patents on the treatment of waste liquid crystal displays mainly focus on the recovery of indium, but the general treatment method is acid leaching-replacement, and the acid leaching solution used cannot be recycled, causing serious pollution, high corrosion and high cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A method for comprehensive recovery and treatment of secondary resources of waste liquid crystal displays, comprising the following steps:

[0025] (1) Use mechanical and physical dismantling and electrostatic separation methods to disassemble discarded liquid crystal displays to obtain plastic parts, cables, liquid crystal glass substrates and polarizers, and recycle plastic parts, cables and polarizers.

[0026] (2) Take the liquid crystal glass substrate obtained in step (1) and dissolve it in the organic solvent N-methylpyrrolidone under heating and reflux conditions. The mass ratio of N-methylpyrrolidone to the liquid crystal glass substrate is 12:1 to obtain a liquid crystal A glass substrate and a liquid crystal-containing N-methylpyrrolidone solution, and then fractionally distilling the liquid crystal-containing N-methylpyrrolidone solution to collect the liquid crystals.

[0027] (3) Soak the glass substrate without liquid crystal obtained in step (2) with a m...

Embodiment 2

[0030] A comprehensive recycling method for waste liquid crystal displays, comprising the following steps:

[0031] (1) Use mechanical and physical dismantling and electrostatic separation methods to disassemble discarded liquid crystal displays to obtain plastic parts, cables, liquid crystal glass substrates and polarizers, and recycle plastic parts, cables and polarizers.

[0032] (2) Take the liquid crystal glass substrate obtained in step (1) and dissolve it in the organic solvent dimethyl sulfoxide under heating and reflux conditions. The mass ratio of dimethyl sulfoxide to liquid crystal glass substrate is 23:1 to obtain a glass substrate without liquid crystal and liquid crystal-containing dimethyl sulfoxide solution, and then fractionally distill the liquid crystal-containing dimethyl sulfoxide solution to collect liquid crystals.

[0033] (3) Soak the glass substrate without liquid crystal obtained in step (2) with a mixed solution of ammonia water and ammonium sulfat...

Embodiment 3

[0036] A comprehensive recycling method for waste liquid crystal displays, comprising the following steps:

[0037](1) Use mechanical and physical dismantling and electrostatic separation methods to disassemble discarded liquid crystal displays to obtain plastic parts, cables, liquid crystal glass substrates and polarizers, and recycle plastic parts, cables and polarizers.

[0038] (2) Take the liquid crystal glass substrate obtained in step (1) and dissolve it in the organic solvent tetrahydrofuran under reflux conditions, the mass ratio of tetrahydrofuran to liquid crystal glass substrate is 56:1, and obtain a glass substrate without liquid crystal and a tetrahydrofuran solution containing liquid crystal , and then carry out fractional distillation on the tetrahydrofuran solution containing liquid crystals to collect liquid crystals.

[0039] (3) Soak the glass substrate without liquid crystal obtained in step (2) with a mixed solution of ammonia water and ammonium sulfate (...

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Abstract

The invention discloses a comprehensive recycle treatment method of waste liquid crystal display (LCD) secondary resources, which comprises following steps: (1) disassembling a waste liquid crystal display through methods of mechanical physical disassembly and electrostatic separation to obtain plastic parts, wire cables, liquid crystal glass base boards and polaroids; (2) dissolving the liquid crystal glass base boards in an organic solvent under a heating reflux condition to obtain the glass base boards being free of liquid crystal and the organic solvent containing the liquid crystal, and performing fractionation to the organic solvent containing the liquid crystal to collect the liquid crystal; (3) soaking the glass base boards being free of liquid crystal in a mixed solution composed of ammonia water and ammonium sulfate, and performing stirring and filtration to collect a filtrate and filter residues; and (4) performing micro-emulsion membrane method to the filtrate to extract indium, wherein the indium in the water phase after demulsification is extracted in a replacement manner and the micro-emulsion is subjected to heating regeneration treatment. The comprehensive recycle treatment method is beneficial to increase of recycle utilization rate and resource regeneration rate of the parts in the waste liquid crystal display, can maximumly achieve recycle and reuse of resources, and is significant in influence on environmental-protective economic and social benefits.

Description

Technical field [0001] The invention involves a recycling method of waste resources, especially the comprehensive recycling processing method of a secondary resource of a waste LCD display. Background technique [0002] LCD display (LCD) has quickly become a market hot spot due to the advantages of low energy consumption, good color, no flashing, non -flashing, non -electromagnetic radiation, light and easy to carry.In recent years, with the rapid development of liquid crystal display related technologies, the manufacturing cost of LCD display has continued to decrease, and LCD has gradually replaced the traditional cathode ray tube. It is widely used in various display equipment such as computers, television, mobile phones, digital cameras, instruments and other display equipmentAmong them, its market share has increased year by year.According to data, global LCD shipments in 2010 reached 180 million units.LCD is an electronic consumable. Its service life gradually shortens with...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B09B5/00
Inventor 肖国光邓曙新
Owner HUNAN TONGLI ELECTRONICS WASTE RECOVERING DISSEMBLING & UTILIZATION
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