Leaching method for indium in waste liquid crystal panel and leaching agent

A liquid crystal panel and leaching agent technology, applied in the direction of improving process efficiency, etc., can solve problems such as poor environmental economy, strong corrosion of equipment, environmental pollution, etc., achieve easy control of process conditions, reduce production costs, and simple process Effect

Inactive Publication Date: 2016-04-13
YUNNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of strong acid and strong alkali is very corrosive to equipment, and the resulting acid and alkali waste will also cause serious pollution to the environment, resulting in the current high cost of indium recovery technology routes in my country and poor environmental economy.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The concrete steps of this embodiment are as follows:

[0023] (1) Weigh 70.0g of choline chloride and 52.2g of malonic acid respectively, stir and mix them evenly, and then place them in an oven at 80°C until a transparent, uniform, and clear eutectic ionic liquid is formed, take them out and cool them until use;

[0024] (2) Weigh 100g of waste liquid crystal screen powder, add 200mL of acetone, soak at room temperature for 2 hours, filter, wash the powder twice with an appropriate amount of acetone, distill the filtrate under reduced pressure to recover acetone, and dry the solid powder for later use;

[0025] (3) The eutectic ionic liquid prepared in step (1) was added to the solid powder treated in step (2), and stirred and leached at 80°C for 24 hours, and the leaching rate of indium was 100%.

Embodiment 2

[0027] The concrete steps of this embodiment are as follows:

[0028] (1) Weigh 70.0g of choline chloride and 63.2g of oxalic acid dihydrate, stir and mix evenly, and then place them in an oven at 80°C until a transparent, uniform, and clear eutectic ionic liquid is formed. Take out and cool use;

[0029] (2) Weigh 100g of waste liquid crystal screen powder, add 200mL of acetone, soak at room temperature for 2 hours, filter, wash the powder twice with an appropriate amount of acetone, distill the filtrate under reduced pressure to recover acetone, and dry the solid powder for later use;

[0030] (3) The eutectic ionic liquid prepared in step (1) was added to the solid powder treated in step (2), and stirred and leached at 80°C for 24 hours, the leaching rate of indium was 98%.

Embodiment 3

[0032] The concrete steps of this embodiment are as follows:

[0033] (1) Weigh 70.0g of choline chloride and 59.2g of succinic acid respectively, stir and mix evenly, and then place them in an oven at 80°C until a transparent, uniform, and clear deep eutectic ionic liquid is formed. use;

[0034] (2) Weigh 100g of waste liquid crystal screen powder, add 200mL of acetone, soak at room temperature for 2 hours, filter, wash the powder twice with an appropriate amount of acetone, distill the filtrate under reduced pressure to recover acetone, and dry the solid powder for later use;

[0035] (3) The eutectic ionic liquid prepared in step (1) was added to the solid powder treated in step (2), and stirred and leached at 80°C for 24 hours, the leaching rate of indium was 97%.

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Abstract

The invention relates to a leaching method for indium in a waste liquid crystal panel and a corresponding leaching agent, and belongs to the technical field of solid waste recycling. Eutecticevaporate ionic liquid formed through choline chloride and diacid substances serves as the leaching agent, after a liquid crystal panel glass substrate is crushed into powder with the granularity of 50-200 meshes, the powder is immersed through the eutecticevaporate ionic liquid, the immersing temperature is 50-90 DEG C, the immersing time is 12-48 h, the solid and liquid mass ratio of the glass powder to the eutecticevaporate ionic liquid is 1:0.5-1:2, and the indium leaching rate is higher than 95%. The leaching method has the advantages that the leaching agent preparing method is simple, the leaching agent is environment-friendly and capable of being circularly used, the leaching method operation technology is simple, the indium leaching rate is high, and selectivity is high, and an effective method for recycling indium from the waste liquid crystal panel is provided.

Description

technical field [0001] The invention relates to a method for leaching indium from waste liquid crystal panels and a corresponding leaching agent, belonging to the technical field of solid waste recovery. Background technique [0002] Liquid crystal display (LCD) is a key component of various information equipment displays, and is widely used in modern electronic and mechanical products such as notebook computers, computers, TVs, mobile phones, and operation panels of various mechanical equipment. With the rapid growth of LCD products and the replacement and elimination of products, a large number of waste LCDs have gradually become an important component of waste electronics. The resulting ecological and environmental problems and the recycling of waste LCDs have attracted widespread attention. In 2009, my country promulgated the "Regulations on the Administration of Recycling and Disposal of Waste Electronic Products", which came into effect on January 1, 2011. Waste LCD T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B58/00C22B3/16
CPCC22B3/16C22B7/007C22B58/00Y02P10/20
Inventor 黄强寸唐湘
Owner YUNNAN UNIV
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