Comprehensive recycling method of waste plasma screen

A plasma screen and waste technology, which is applied in the field of comprehensive recycling of ion screens, can solve problems such as lack of comprehensive utilization and recycling, and achieve the effects of simplifying steps, low energy consumption, and reducing leaching time.

Active Publication Date: 2014-04-02
SICHUAN CHANGHONG ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is also a lack of comprehensive utilization and recycling methods for waste plasma screens

Method used

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  • Comprehensive recycling method of waste plasma screen
  • Comprehensive recycling method of waste plasma screen
  • Comprehensive recycling method of waste plasma screen

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1 sulfuric acid and nitric acid leaching experiment of the present invention

[0041]In this example, the mixture of the front panel and the rear panel of the waste plasma screen is crushed or even finely ground to obtain waste plasma screens with different particle sizes (maximum distance between any two points) as shown in Table 1, and then the mass Sulfuric acid and nitric acid with a percentage concentration of 20% were used for leaching. Ultrasonic activation treatment and stirring were performed during leaching. The ultrasonic vibrator was closed at the bottom of the leaching tank, and the ultrasonic frequency was about 40kHz. The leaching rate was finally tested. The results are shown in Table 1. Among them, the leaching rate of sulfuric acid refers to the ratio of the total amount of indium, zinc, yttrium and europium leached to the total amount of indium, zinc, yttrium and europium contained in waste plasma screens, and the leaching rate of nitric aci...

Embodiment 2

[0047] Embodiment 2 The present invention directly reclaims silver, yttrium, europium, zinc and indium with nitric acid leaching

[0048] In this example, 50 kg of the mixture of the waste plasma screen front panel and rear panel were weighed and coarsely crushed to obtain 18.1 kg with a particle size (maximum distance between any two points) of 5 to 10 cm, 20.6 kg with a particle size of 10 to 15 cm, and 15 16.7kg for 20-20cm, 23.4kg for 20-25cm, 21.2kg for 25-30cm. It contains 150.1g of silver, 90.2g of yttrium, 20.0g of europium, 802.1g of zinc and 10.3g of indium. The 100kg waste plasma screen front panel and rear panel come from the same batch of production waste, the raw material is stable, and the content of each element is also stable.

[0049] Use 2L of nitric acid with a mass percentage concentration of 15% for leaching in batches, leaching for 5 minutes each time, ultrasonic activation and stirring during leaching, the ultrasonic vibrator is closed on the side wall...

Embodiment 3

[0050] Embodiment 3 The present invention directly reclaims silver, yttrium, europium, zinc and indium with sulfuric acid and nitric acid leaching

[0051] In this example, 50 kg of the mixture of the waste plasma screen front panel and rear panel were weighed and coarsely crushed to obtain 17.9 kg with a particle size (maximum distance between any two points) of 5 to 10 cm, 23.4 kg with a particle size of 10 to 15 cm, and 15 17.6kg for ~20cm, 21.4kg for 20~25cm, 19.7kg for 25~30cm. It contains 150.1g of silver, 90.2g of yttrium, 20.0g of europium, 802.1g of zinc and 10.3g of indium. 100kg of waste plasma screen front panel and rear panel come from the same batch of production waste, the raw material is stable, and the content of each element is stable.

[0052] Use 2L of sulfuric acid with a mass percentage concentration of 15% for leaching in batches, leaching for 10 minutes each time, and perform ultrasonic activation and stirring during leaching. The ultrasonic vibrator i...

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Abstract

The invention discloses a comprehensive low-energy consumption recycling method of a waste plasma screen and belongs to the field of industrial waste regeneration. The method comprises that a), the waste plasma screen is roughed, so that the maximum range between any two points of the waste plasma screen ranges between 5cm and 30cm; b), the roughed waste plasma screen is added into a salpeter solution for leaching, during leaching, ultrasonic wave activating treatment and stirring are conducted; and c), silver is recycled from an obtained solution which is subjected to nitrate leaching. According to the method, the step that the plasma screen is required to fine grinding is reduced, the energy consumption is reduced, the leaching time is reduced, the efficiency is improved, and the problems that for a long time, technical workers in the field hold a technical bias that the granularity has to be reduced as possible in order to improving the leaching efficiency, and glass is easy to bond when encountering water are solved. The method is low in energy consumption, high in efficiency, capable of preparing silver with the purity of more than 99.9% and being processed in large scales, and suitable for being popularized and applied in the field.

Description

technical field [0001] The invention relates to the field of industrial waste regeneration, in particular to a method for comprehensive recycling of waste plasma screens. Background technique [0002] The plasma display screen is mainly composed of two parts, the front plate and the rear plate. The front plate is the side close to the user, including the front glass substrate, ITO electrodes, Bus electrodes, front dielectric layer, and MgO film. The rear plate includes a phosphor layer, a barrier rib, a rear dielectric layer, an Add electrode, and a rear glass substrate. In addition to glass, the plasma display contains silver in the Bus electrode and Add electrode, yttrium and europium in the phosphor layer, zinc in the front dielectric layer, barrier layer, and rear dielectric layer, and indium in the ITO electrode. From the perspective of environmental protection and resource reuse Considering that it is necessary to recycle waste plasma display screens. [0003] JP 200...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/06C22B11/00
CPCY02P10/20
Inventor 潘晓勇彭玲郅慧李中良陈伟华
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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