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Method for recycling indium from waste liquid crystal displays

A liquid crystal display and liquid crystal display panel technology, applied in the direction of improving process efficiency, etc., can solve problems such as low energy consumption, easy pollution of the environment, and large resource consumption, and achieve the effects of increased concentration, low energy consumption, high recovery rate, and high purity

Active Publication Date: 2014-02-26
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The application number is 200610088278.4 invention patent discloses a liquid crystal display panel recycling treatment method, the invention realizes the harmless treatment of waste glass panels, but in the step of removing the polarizing film, the method of soaking and removing organic matter, inorganic acid or inorganic alkali is used , high resource consumption, easy to pollute the environment and difficult to achieve industrialization
[0005] In summary, there is a lack of a low-energy and industrialized way to process liquid crystal displays in large quantities and recover the rare metal indium from them

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049]A home appliance dismantling company in Southwest China used an electric heating and rolling shaft film stripping machine to strip the polarizing film of the LCD (a film stripping machine has a daily processing capacity of 500 pieces of LCDs with 15-60-inch flat-panel TVs), and then After 50 pieces of 39-inch liquid crystal screens were broken into blocks, they were put into a 70L acid leaching reaction vessel, soaked in 50L of sulfuric acid solution with a concentration of 2mol / L for 4 hours, and the temperature was 35°C, and carried out Ultrasonic vibration; then take out the LCD screen from the solution and add 1L of concentrated sulfuric acid and broken 50 liquid crystal screens of 39 inches in size, soak according to the conditions of last soaking; soak 8 times like this; Adjust the pH of the solution to 1.5 with sodium hydroxide, then use 30% P204+sulfonated kerosene as the extractant, and perform centrifugal extraction with an extractor according to the water phase...

Embodiment 2

[0051] A home appliance dismantling company in Southwest China used an electric heating and rolling shaft film stripping machine to strip the polarizing film of the LCD (a film stripping machine has a daily processing capacity of 500 pieces of 15-60-inch flat-screen LCD TVs), and then After breaking 500 pieces of 42-inch liquid crystal screens into blocks, put them into a 700L acid leaching reaction vessel, soak them in 500L of sulfuric acid solution with a concentration of 2mol / L for 8 hours at a temperature of 25°C, and Carry out ultrasonic vibration; After taking out liquid crystal screen from solution, add the concentrated sulfuric acid of 10L and the liquid crystal display screen of 500 pieces of 42 inches after wherein adding to it after being broken, soak according to the condition of soaking last time; Soak repeatedly 5 times like this; The solution is adjusted to PH to 1.5 with sodium hydroxide, and then 30% P204 / sulfonated kerosene is used as the extractant, and centr...

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Abstract

The invention discloses a method for recycling indium from waste liquid crystal displays in an industrial manner, which belongs to the field of waste recycle. The method comprises the following steps: firstly, stripping a polarizing film from a liquid crystal display panel through a film stripping machine; then, crushing the liquid crystal display panel into lumpy glass boards with maximal distance between any two points being 5-200mm; soaking the crushed lumpy glass boards in a sulfuric acid solution, and oscillating the crushed lumpy glass boards ultrasonically in the soaking process; regulating the pH value of the solution obtained after the soaking procedure to 1.0-2.0, and obtaining a pure indium-containing solution in an extraction and back extraction manner; and regulating the pH value of the pure indium-containing solution to 2.0-3.0, and then, replacing through a metal more active than indium ions to obtain indium. The integral process disclosed by the invention not only ensures high recovery and purity for the indium, but also has low energy consumption, so that the process is suitable for large-scale industrial production of enterprises.

Description

technical field [0001] The invention belongs to the field of waste recycling, and in particular relates to a method for recycling indium from liquid crystal displays in an industrialized manner. Background technique [0002] Liquid crystal displays are widely used in various information devices such as televisions and computers. Due to its wide range of uses, a large number of liquid crystal displays are now beginning to be scrapped, and a large number of waste liquid crystal displays are produced every year, which has become one of the main sources of electronic waste at present and in the future. Because it contains a large amount of heavy metals and toxic organic substances, untreated waste liquid crystal displays will cause serious heavy metal pollution and organic pollution, posing a great hidden danger to the ecological environment. [0003] On February 25, 2009, my country promulgated the "Regulations on the Administration of Recycling and Disposal of Waste Electrica...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B58/00
CPCY02P10/20
Inventor 潘晓勇彭玲乔君喜陈正韦泽平陈伟华
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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