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A method for enriching and purifying indium from acid leaching solution containing ito waste by salting out

A technology of waste acid and action, applied in the field of recycling and utilization of waste containing ITO, to achieve the effect of efficient separation, high purity, and efficient enrichment and purification

Active Publication Date: 2018-08-21
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention mainly solves the problem of enriching and purifying indium in the acid leaching solution containing ITO waste, based on the ionic liquid extraction system, the salting-out effect is used to realize the Indium 3+ with Fe 3+ , Sn 2+ High-efficiency separation, the extractant can be recycled

Method used

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  • A method for enriching and purifying indium from acid leaching solution containing ito waste by salting out

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Adjust the acid dipping solution hydrochloric acid concentration containing ITO waste to 4mol / L to obtain mixed solution 1; add salting-out agent sodium nitrate in mixed solution 1 to obtain mixed solution 2, and the corresponding sodium nitrate concentration is 3mol / L; mixed solution 2 Add ionic liquid A336NO 3 As an extractant, the corresponding oil-to-liquid volume ratio is 1:20, and the oil-liquid mixed phase 1 is obtained after extraction for 20 minutes; the oil-liquid mixed phase 1 is separated to obtain Fe-containing 3+ , Sn 2+ The ionic liquid phase 1 and containing In 3+ 、Al 3+ , Ca 2+ 、Na + , Mg 2+ The raffinate 1; the ionic liquid phase 1 is washed and purified with 0.5mol / L hydrochloric acid washing solution with an oil / liquid ratio of 1:5 for 30 minutes, and the purified ionic liquid 1 can be recycled; the raffinate 1 utilizes hydrogen The sodium oxide solution adjusts the acidity to 0.2mol / L to obtain a mixed solution 3; add 1 / 2 of the purified ionic...

Embodiment 2

[0025] Adjust the acid dipping solution hydrochloric acid concentration containing ITO waste to 5mol / L to obtain mixed solution 1; the salting-out agent sodium nitrate in mixed solution 1 obtains mixed solution 2, and the corresponding sodium nitrate concentration is 2.5mol / L; mixed solution 2 Add ionic liquid A336NO 3 As an extractant, the corresponding volume ratio of oil to liquid is 1:1. After 40 minutes of extraction, the oil-liquid mixed phase 1 is obtained; the oil-liquid mixed phase 1 is separated to obtain Fe-containing 3+ , Sn 2+ The ionic liquid phase 1 and containing In 3+ 、Al 3+ , Ca 2+ 、Na + , Mg 2+ The raffinate 1; the ionic liquid phase 1 is washed and purified with 0.8mol / L hydrochloric acid washing solution with an oil / liquid ratio of 1:8 for 20 minutes, and the purified ionic liquid 1 can be recycled; the raffinate 1 is oxidized by hydrogen The sodium solution adjusts the acidity to 0.4mol / L to obtain the mixed solution 3; the purified ionic liquid 1 / 2...

Embodiment 3

[0027] Adjust the concentration of hydrochloric acid in the pickling solution containing ITO waste to 5mol / L to obtain a mixed solution 1; in the mixed solution 1, the salting-out agent sodium nitrate is obtained to obtain a mixed solution 2, and the corresponding concentration of sodium nitrate is 2mol / L; in the mixed solution 2, add Ionic liquid A336NO 3 As an extractant, the corresponding oil-to-liquid volume ratio is 1:20, and the oil-liquid mixed phase 1 is obtained after extraction for 10 minutes; the oil-liquid mixed phase 1 is separated to obtain Fe-containing 3+ , Sn 2+ The ionic liquid phase 1 and containing In3+ 、Al 3+ , Ca 2+ 、Na + , Mg 2+ raffinate 1; ionic liquid phase 10.2mol / L hydrochloric acid with an oil / liquid ratio of 1:15, after washing and purifying for 10 minutes, the purified ionic liquid 1 can be recycled; raffinate 1 is adjusted by sodium hydroxide solution The acidity reaches 0.1mol / L to obtain the mixed liquid 3; the purified ionic liquid 1 / 2 i...

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Abstract

The invention discloses a method for enriching and purifying indium from an ITO-containing waste acid leaching solution by utilizing salting-out, and belongs to the technical field of recycling and utilization of ITO-containing waste materials. Adjust the hydrochloric acid system containing ITO waste, and then add a salting-out agent; use A336NO3 to extract, separate the liquid and remove impurities, and realize the separation of the ionic liquid phase 1 of Fe3+ and Sn2+ from the raffinate 1 containing In3+; wash and purify the ionic liquid phase with hydrochloric acid 1 after recycling, NaOH adjusts the acidity of raffinate 1 and then adds A336NO3 to extract and recover indium; the obtained oil-liquid mixed phase 2 separates and removes impurities, and obtains ionic liquid phase 2 and tail liquid 2 containing In3+; ionic liquid Phase 2 is eluted with hydrochloric acid to obtain a high-purity In enrichment solution, and the purified ionic liquid phase 2 is recycled. The invention is based on an ionic liquid extraction system, utilizes the salting-out effect to adjust the anion system in the solution, realizes efficient separation of impurity tin and iron, and efficient enrichment and purification of indium.

Description

technical field [0001] The invention belongs to the technical field of recycling ITO-containing waste materials, in particular to a method for enriching and purifying indium from an ITO-containing waste material pickling solution by using salting-out. Background technique [0002] As a rare metal, indium reserves are extremely rare worldwide, and its abundance in the earth's crust is only 4.0×10 -8 , is 1 / 6 of gold, and the primary ore with a grade of more than 0.002% has the value of smelting, and has been listed as a strategic reserve resource by various countries. Indium and its compounds have good electrical conductivity and light transmission, and more than 75% are used in ITO thin films (In 2 o 3 :SnOx=9:1) preparation of product. [0003] Usually, the largest amount of ITO waste comes from LCD glass and ITO targets. Therefore, typical ITO-containing waste refers to waste liquid crystal displays and ITO waste targets. Because the amount of indium is much higher tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B58/00C22B7/00C22B3/28
CPCC22B7/007C22B58/00C22B3/288Y02P10/20
Inventor 李彬张楷华吴玉锋王维潘德安左铁镛
Owner BEIJING UNIV OF TECH
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