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Method for extracting indium and tin from waste ITO targets through reduction and electrolysis

A technology of electrolytic extraction and indium tin, which is applied in the direction of photography technology, equipment, photography auxiliary technology, etc., can solve the problems of complicated recycling process and high cost, and achieve the effect of simple operation, low production cost and high conversion rate

Active Publication Date: 2015-06-17
ZHUZHOU SMELTER GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] In order to solve the defects of complex recovery process and high cost of existing ITO waste targets, the present invention provides a method for extracting indium tin from ITO waste targets with simple method, low cost and high recovery rate of indium tin

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] A waste target of 5 kg of ITO is used as a raw material, and the composition of the raw material is: 90% by weight of indium oxide and 10% by weight of tin oxide.

[0072] 1. Crushing and ball milling step S1

[0073] The raw material is crushed and ball milled to obtain more than 80% of the powder with a particle size below -120 mesh.

[0074] 2. Indium tin reduction step S2

[0075] Put the pulverized ITO waste target powder into the hydrogen reduction furnace, pass in hydrogen, then control the reduction temperature to 200°C, and the reduction reaction time to 60 minutes, and reduce indium oxide and tin oxide to metal indium and metal tin, indium and The recovery rate of tin is more than 99.5%.

[0076] 3. Anode casting step S3

[0077] Metal indium and tin are melted and cast under the cover of solid potassium hydroxide, soaked in 8% hydrochloric acid for 5 minutes, then washed with hot distilled water at 80°C for 2 minutes, and put on an acid-resistant bag to obta...

Embodiment 2

[0083] A waste target of 5 kg of ITO is used as a raw material, and the composition of the raw material is: 90% by weight of indium oxide and 10% by weight of tin oxide.

[0084] 1. Crushing and ball milling step S1

[0085] The raw material is crushed and ball milled to obtain more than 85% of the powder with a particle size below -120 mesh.

[0086] 2. Indium tin reduction step S2

[0087] Put the pulverized ITO waste target powder into the hydrogen reduction furnace, pass in hydrogen, then control the reduction temperature to 290°C, and the reduction reaction time is 50 minutes, and reduce indium oxide and tin oxide to metal indium and metal tin, indium and The recovery rate of tin is more than 99.5%.

[0088] 3. Anode casting step S3

[0089] Metal indium and tin are melted and cast under the cover of solid potassium hydroxide, soaked in 9% hydrochloric acid for 4 minutes, then washed with hot distilled water at 70°C for 3 minutes, and put on an acid-resistant bag to ob...

Embodiment 3

[0095] A waste target of 5 kg of ITO is used as a raw material, and the composition of the raw material is: 90% by weight of indium oxide and 10% by weight of tin oxide.

[0096] 1. Crushing and ball milling step S1

[0097] The raw material is crushed and ball milled to obtain more than 88% of the powder with a particle size below -120 mesh.

[0098] 2. Indium tin reduction step S2

[0099] Put the pulverized ITO waste target powder into the hydrogen reduction furnace, pass in hydrogen, then control the reduction temperature to 400°C, and the reduction reaction time is 30 minutes to reduce indium oxide and tin oxide to metal indium and metal tin, indium and The recovery rate of tin is more than 99.5%.

[0100] 3. Anode casting step S3

[0101] Metal indium and tin are melted and cast under the cover of solid sodium hydroxide, soaked in 12% hydrochloric acid for 3 minutes, then washed with hot distilled water at 50°C for 2 minutes, and put on an acid-resistant bag to obtain...

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Abstract

The invention provides a method for extracting indium and tin from waste ITO targets through reduction and electrolysis. According to the method, waste ITO targets having undergone crushing and ball milling are reduced in a reducing furnace through reducible substances, and indium oxide and tin oxide are respectively reduced into metallic indium and metallic tin; an indium tin alloy anode is casted under the protection of alkali; and electrolysis is carried out under alkaline conditions so as to realize electrodeposition of tin onto a cathode and recovery of refined tin, anode mud is indium hydroxide, and refined indium is extracted from indium hydroxide through leaching, purifying and electrodeposition. The method provided by the invention has simple process flow, a short cycling period and high recovery rates of indium and tin and overcomes the problem of difficult filtering of indium hydroxide at the same time, so the method has the obvious advantages of low recovery cost, energy conservation, environmental protection, etc. In industrial production, the recovery rate of tin reaches 98.5%, the recovery rate of indium is more than 99%, and the grades of refined indium and refined tin exceed 99.995%.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal metallurgy, and in particular relates to a method for extracting indium tin through reduction and electrolysis of waste ITO targets. Background technique [0002] ITO (Tin-doped Indium Oxide) target is an indium-tin composite oxide ceramic material. ITO film has the characteristics of light transmission, conductivity and heat reflection. It is widely used in transparent electrodes of flat-panel display devices, high-end building curtain walls, aircraft and It is an important photoelectric material for anti-frost and anti-fog glass of vehicles, solar energy concentrating devices and lighting lamps. In industrial applications, the utilization rate of ITO target sputtering coating is only 20% to 30%, and the remaining part becomes waste target material, plus the scrap, cutting and waste products generated during the target forming process. At present, the global ITO target consumption exceeds 1,500 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B25/06C22B58/00C25C1/14
Inventor 刘一宁廖贻鹏伏东才林文军张磊
Owner ZHUZHOU SMELTER GRP
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