Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and apparatus for recovering indium from waste liquid crystal display

The technology of a liquid crystal display and a recycling method is applied to the removal of solid waste, the improvement of instrument and process efficiency, etc., and can solve the problems of long time, change in the properties of indium hydroxide, poor filterability of indium hydroxide, etc., and improve the reaction speed of precipitation. , high recovery rate, the effect of improving recovery rate

Inactive Publication Date: 2008-02-27
KOBELCO ECO-SOLUTIONS CO LTD +1
View PDF1 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, according to the above-mentioned wet treatment method, the filterability of the indium hydroxide obtained by the treatment is poor, it takes a long time to operate, and there is also a problem that the properties of the indium hydroxide obtained by neutralization etc. change.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and apparatus for recovering indium from waste liquid crystal display
  • Method and apparatus for recovering indium from waste liquid crystal display
  • Method and apparatus for recovering indium from waste liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0037] As shown in Figure 1, the recovery device of indium from waste LCDs of the present embodiment includes: an indium dissolving device (hereinafter also referred to as an In dissolving device) 1 that uses hydrochloric acid to dissolve ITO from waste LCDs; The impurity removal reactor 2 for removing impurity metals other than In by adding iron particles (Fe particles) to the indium-containing compound solution containing In dissolved in the device 1; The precipitation removal device 3 for removing the Fe particles in the waste liquid as hydroxides of iron (Fe) by precipitation; the recovery device for recovering In from the waste liquid in which the hydroxides of Fe were precipitated and removed by the precipitation removal device 3 Reactor 4. Moreover, although not shown in figure, the front stage of the In dissolution apparatus 1 is provided with the pulverizer which pulverizes waste LCD. In addition, the term "shredder" in the present invention refers to crushing waste ...

Embodiment approach 2

[0073] The structure of the reactor body 5 of the impurity removal reactor 2 and the recovery reactor 4 of this embodiment is different from that of the first embodiment described above. That is, in the present embodiment, as shown in FIG. 3 , the entire peripheral surface of the reactor body 5 is tapered upward, and the cross-sectional area of ​​the reactor body 5 continuously increases upward. This point is different from the case of Embodiment 1 in which the cross-sectional area of ​​the reactor main body 5 increases discontinuously upward.

[0074] Since the cross-sectional area is not discontinuous, but the cross-sectional area is continuously increased upward, in this embodiment, the reactor upper part 6, the reactor middle part 7, and the reactor lower part 8 are not divided into the structure as in the first embodiment. .

[0075] However, the point that the ultrasonic oscillators 15 a , 15 b , and 15 c are provided at three locations from the upper part to the lower ...

Embodiment approach 3

[0078] In the present embodiment, instead of the mechanism for oscillating with ultrasonic waves generated by the ultrasonic oscillator in the first and second embodiments described above, a mechanism for stirring using an electromagnet is employed as the mechanism for separating the precipitated metal from the metal particles. That is, in the present embodiment, as shown in FIG. 4, on the guide rail 18 provided on the side of the reactor main body 5 having a rectangular horizontal cross section, a slide plate 17 equipped with an electromagnet 16 as shown in FIG. . As shown in FIG. 5 , the slide plate 17 has a space portion 19 in the center, and is disposed so as to insert the reactor body 5 into the space portion 19 to surround the reactor body 5 . In addition, the metal particle used in this embodiment is iron etc. which are magnetic bodies.

[0079] In addition, as shown by the arrow 20 in FIG. 4 , the metal particles in the reactor 5 are stirred by alternately moving up a...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

This invention provides a method and apparatus for recovering In in the form of an alloy or a metal simple substance as a valuable material from waste LCD. In the In recovery method and apparatus, there is no need to recover In as indium hydroxide, and In can be recovered as a valuable metal. Accordingly, unlike the case of indium hydroxide, the recovery does not suffer from poor handling, and In can easily be recovered through a filter or the like with significantly improved In recovery. The In recovery method is characterized by comprising crushing waste LCD containing indium tin oxide, dissolving indium tin oxide from the crushed waste LCD with an acid to give an indium compound-containing solution, allowing the solution to flow into a reactor for recovery and, further, adding particles of a metal having a larger ionization tendency than In into the reactor for recovery, fluidizing the metal particles, precipitating In or an In alloy contained in the indium compound-containing solution onto the surface of the metal particles, then separating the precipitated In or In alloy from the metal particles by separation means, and separating and recovering the separated solid In or In alloy from the liquid component.

Description

technical field [0001] The present invention relates to a recovery method and device for indium from waste liquid crystal displays, more specifically, to liquid crystal displays discharged from discarded liquid crystal televisions, mobile phones, portable game machines, etc. A method and an apparatus for recovering indium (In), which is a valuable substance, as an alloy or a single metal in hereinafter also referred to as waste LCD). Background technique [0002] In a liquid crystal display (hereinafter also referred to as LCD), an indium tin oxide (ITO) film is used as a transparent electrode. The ITO film is mainly formed by sputtering, and In is used as the target. In is a rare metal obtained in the zinc refining process, and there has been concern about its depletion in recent years. Waste LCDs contain about 300mg / L of In, and with the depletion of In, it is expected that In will be recovered during recycling. [0003] In response to such a demand, attempts have been ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C22B58/00C22B3/46C22B25/00C22B3/04C22B3/44B09B3/00G02F1/13
CPCC22B58/00C22B7/007C22B7/005C22B3/46C22B25/06Y02P10/20B09B3/00G02F1/13C22B3/04
Inventor 村谷利明本马隆道前背户智晴岛田光重
Owner KOBELCO ECO-SOLUTIONS CO LTD