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A kind of recycling method of metal indium in waste liquid crystal screen

A recycling method and liquid crystal screen technology, applied in the field of circular economy, can solve problems such as complex sources of liquid crystal materials, difficulty in peeling off polarizers, difficulty in controlling non-indium metal ions, etc., achieving significant economy, easy industrial production, and avoiding the interference of impurity metals Effect

Active Publication Date: 2020-11-10
UNIV OF SCI & TECH BEIJING
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  • Abstract
  • Description
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Problems solved by technology

[0006] Aiming at the technical problems of complex sources of liquid crystal materials, difficulty in peeling off polarizers, and difficulty in controlling non-indium metal ions in the acid leaching process in the process of waste liquid crystal screens, the present invention provides a method for recovering metal indium in waste liquid crystal screens. As a raw material, indium hydroxide is obtained through dismantling, crushing, liquid crystal separation, acid leaching, extraction, stripping, and pH adjustment.

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  • A kind of recycling method of metal indium in waste liquid crystal screen

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Embodiment 1

[0025] Disassemble waste LCD screens, separate out LCD glass boxes, and recycle plastic and metal materials. The liquid crystal glass cell was broken into small pieces of 10 cm using a shear shredder. The crushed material is mixed with acetone and then added to the supercritical reactor. The liquid-solid ratio of acetone to material is 30:1. Heat the reactor to 400°C, the reaction pressure is 8MPa, and keep it warm for 30min. After heat preservation, the reactor was cooled to room temperature and the materials were taken out. After filtration, an acetone solution containing liquid crystals and glass fragments without liquid crystals were obtained. The acetone solution containing liquid crystals is fractionally distilled to obtain liquid crystals and acetone, and the acetone can be reused. Use 2.0mol / L hydrochloric acid solution to carry out acid leaching on the glass fragments not containing liquid crystal, the liquid-solid ratio of hydrochloric acid to material is 8:1, the...

Embodiment 2

[0027] Disassemble waste LCD screens, separate out LCD glass boxes, and recycle plastic and metal materials. The liquid crystal glass cell was broken into small pieces of 1 cm using a shear shredder. The crushed material is mixed with acetone and then added to the supercritical reactor. The liquid-solid ratio of acetone to material is 10:1. Heat the reactor to 260°C, the reaction pressure is 4MPa, and keep it warm for 120min. After heat preservation, the reactor was cooled to room temperature and the materials were taken out. After filtration, an acetone solution containing liquid crystals and glass fragments without liquid crystals were obtained. The acetone solution containing liquid crystals is fractionally distilled to obtain liquid crystals and acetone, and the acetone can be reused. Use 8.0mol / L hydrochloric acid solution to carry out acid leaching on the glass fragments not containing liquid crystal, the liquid-solid ratio of hydrochloric acid to material is 15:1, th...

Embodiment 3

[0029] Disassemble waste LCD screens, separate out LCD glass boxes, and recycle plastic and metal materials. Use a shear shredder to break the liquid crystal glass cell into small pieces of 5 cm. Mix the crushed material with acetone and add it to the supercritical reactor. The liquid-solid ratio of acetone to material is 20:1. Heat the reactor to 300°C, the reaction pressure is 6MPa, and keep the temperature for 90min. After heat preservation, the reactor was cooled to room temperature and the materials were taken out. After filtration, an acetone solution containing liquid crystals and glass fragments without liquid crystals were obtained. The acetone solution containing liquid crystals is fractionally distilled to obtain liquid crystals and acetone, and the acetone can be reused. Use 5.0mol / L hydrochloric acid solution to carry out acid leaching on the glass fragments not containing liquid crystal. The liquid-solid ratio of hydrochloric acid to material is 10:1, the acid...

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Abstract

The invention belongs to the technical field of circular economy, and specifically relates to a method for recovering metal indium in waste liquid crystal screens. The method uses waste liquid crystal screens as raw materials and undergoes dismantling, crushing, liquid crystal separation, acid leaching, extraction, stripping, and adjustment. Indium hydroxide is obtained in the pH value process; through supercritical acetone cleaning, fractionation, and selective leaching of metals, the pollution-free and efficient recovery of indium in waste liquid crystal screens is realized. The method of the invention has the characteristics of high efficiency, environmental protection and easy industrial production, and has remarkable economic, environmental and social benefits.

Description

technical field [0001] The invention belongs to the technical field of circular economy, and specifically relates to a method for recovering metallic indium in waste liquid crystal screens. The method can use waste liquid crystal screens generated during the disposal of scrapped automobiles and waste electronic products as raw materials to recover indium. Background technique [0002] Indium is a silver-gray, extremely soft rare metal whose abundance in the earth's crust is only 0.00001%. Indium and its compounds have been widely used in electronic communication, energy, national defense, medicine, aerospace and other fields due to their unique physical and chemical properties. Among them, the largest application field of indium is conductive glass ITO (Indium Tin Oxide) film and semiconductor indium phosphide (accounting for about 70% of the total consumption of indium), and the second largest application field is solder, solder paste and low melting point alloys. In addit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B58/00
CPCC22B7/007C22B58/00C22B3/3846Y02P10/20
Inventor 刘波张深根
Owner UNIV OF SCI & TECH BEIJING
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