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Method of recycling useful metal

一种再循环、金属的技术，应用在回收利用技术、工艺效率的提高、固体废物的清除等方向，能够解决废弃物不能同时处理、没有具体地公开等问题，达到提高溶解速度、低能耗的效果

Inactive Publication Date: 2010-12-08
SHIBAURA INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0066] In Non-Patent Document 1 and Non-Patent Document 2, only the possibility of separation and recovery of useful metal elements is suggested, and there is no specific disclosure at all.
[0067] In addition to the above problems of the prior art, there are also various types of flat panel displays, picture tubes, waste fluorescent tube glass, waste solar cell panels, waste integrated circuits, waste printed circuit boards, or copper wiring harnesses for vehicles (harness), power The problem that wastes such as cables, transmission and distribution lines, coaxial cables, and parallel two-wire feeders cannot be treated at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0137] Embodiment 1. Recover indium, tin ( figure 2 、25)

[0138] This embodiment mainly relates to claims 1, 2, 3 and the like.

[0139] 2 time)>

[0140] In this embodiment, considering that the transparent electrode (ITO) contains In 2 o 3 and tin oxide (SnO 2 ), investigated In 2 o 3 and SnO 2 Solubility in hydrofluoric acid (HF) aqueous solution.

[0141] First, for indium oxide (In 2 o 3 ) powder dissolved in hydrofluoric acid (HF) for semiconductors was investigated for solubility. Pure water was added to the HF aqueous solution with a concentration of 49% by weight, the HF concentration was adjusted in the range of 10% to 49% by weight, and the In with a purity of 99.99% 2 o 3 The powder was dissolved in 100g of HF aqueous solution, Figure 4 shows the results of investigations on the solubility at a temperature of 24°C. in 2 o 3 In the processing of membranes, HCl and HNO are generally used 3 Aqua regia is the main component, but it is found to be ...

Embodiment approach 2

[0161] Embodiment 2. Recovery of zinc from zinc oxide for transparent electrodes

[0162] This embodiment mainly relates to claims 1, 2, 3, etc., and describes a method of recovering (Zn) from zinc oxide (ZnO) studied as a metal substitute for indium for transparent electrodes.

[0163] 2 time)>

[0164] First, the solubility of ZnO in HF aqueous solution was investigated. Add pure water to a 49% by weight hydrofluoric acid (HF) aqueous solution for semiconductors to adjust the HF concentration, Figure 10 24 shows the results of the solubility survey when ZnO (purity: 99%) powder was dissolved in 100 g of HF aqueous solution at a temperature of 24°C. from Figure 10 It was found that ZnO is soluble in HF aqueous solution. As the HF concentration increases, the solubility of ZnO also increases, and reaches the maximum at HF ​​concentration of 40% by weight. When the HF concentration is further increased, the solubility tends to decrease. That is, from Figure 10 It was ...

Embodiment approach 3

[0173] Embodiment 3. Recovery of rare earth metals such as yttrium, europium, lanthanum, and terbium from fluorescent materials

[0174] This embodiment mainly relates to claims 4, 6, 7 and the like.

[0175]

[0176] In the present embodiment, first, yttrium oxide (Y 2 o 3 ), europium oxide (Eu 2 o 3 ), lanthanum oxide (La 2 o 3 ), terbium oxide (Tb 4 o 7 ) Solubility in various acidic aqueous solutions.

[0177] As the acidic aqueous solution, a 49% HF aqueous solution for semiconductors, a 10% nitric acid (HNO 3 ) aqueous solution, concentration of 10% sulfuric acid (H 2 SO 4 ) aqueous solution, a concentration of 10% hydrochloric acid (HCl) aqueous solution, at a temperature of 24 ° C, the Y with a purity of 99.99% 2 o 3 Powder, 99.9% Eu 2 o 3 Powder, La with a purity of 98.0% 2 o 3 Powder, Tb with a purity of 99.95% 4 o 7 See Table 1 for the solubility when the powder is dissolved in each 100 g of aqueous solution.

[0178] Table 1

[0179]

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Abstract

A method of recycling useful metals is provided. The method enables useful metals including indium, zinc, yttrium, europium, lanthanum, terbium, gadolinium, antimony, lead, copper, tin, and silver to be recovered from wastes, such as abandoned flat panel displays, and recycled economically with small energy consumption. The method of recycling useful metals includes: a step in which wastes comprising various flat panel displays, e.g., liquid-crystal panels, are crushed / powdered; a step in which the resultant particles are dissolved in an aqueous hydrofluoric acid solution; and a step in which various metal oxides and various metal fluorides which remain undissolved are filtered off and the aqueous hydrofluoric acid solution containing various metal ions is electrolyzed to deposit and recover metals for transparent-electrode oxides, such as indium and zinc, and other useful metals.

Description

technical field [0001] The invention relates to a method for recycling useful metals in wastes such as waste flat panel displays, waste cathode ray tubes, waste fluorescent tubes, waste integrated circuits, waste printed substrates and the like. Background technique [0002] In recent years, cathode ray tubes (hereinafter also referred to as kinescopes) have been shifted to liquid crystal panels or plasma display panels as display devices for images and the like, and cathode ray tubes are no longer manufactured in Japan. Therefore, discarded picture tubes increase. In addition, with regard to fluorescent tubes, it is estimated that discarded fluorescent tubes will increase due to renewal of lighting equipment for energy saving and future shift to light-emitting diodes. At the same time, waste such as integrated circuits and printed circuit boards used in electronic equipment is also increasing. Among these wastes, as the indium oxide (In 2 o 3 ) and tin oxide (SnO 2 ) T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00C22B1/00C22B3/04C22B3/46C22B7/00C22B15/00C22B19/30C22B58/00C25C7/06
CPCC22B3/10C22B58/00H01J9/52C25C1/00G02F2203/68C22B7/007C22B3/22G02F1/1343C25C5/04Y02P10/20Y02W30/82
Inventor 本间哲哉生泽诚幸古山知幸森角明弘田中薰平
Owner SHIBAURA INST OF TECH
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