Method for extracting rare and noble metals from waste LED (light-emitting diode) lamps

A rare and precious metal and waste technology, applied in the field of extracting rare and precious metals from waste LED lamps, can solve the problems of occupying a large amount of land resources, waste of metal resources, no LED lamps, etc., achieving low industrial application costs, reducing pollution and damage, and recycling. high rate effect

Active Publication Date: 2015-01-21
荆门格林循环电子废弃物处置有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] If these LED lamps are discarded directly after being discarded, it will not only occupy a large amount of land resources, pollute the environment, but also cause a waste of metal resources. At present, there is no relevant patent report on the extraction of rare and precious metals in LED lamps.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Coarse crushing and sorting: After cleaning and drying the waste LED lamps, the shells are broken, and the LED chips are sorted out;

[0027] (2) Crushing: take the LED chip in step (1), and use ball milling process to grind the LED chip to 150 mesh;

[0028] (3) Separation of gallium: add the LED chip powder in step (2) to concentrated phosphoric acid, react at 153°C for 3 hours, then dilute 3 times, filter and separate to obtain gallium-containing leaching solution and leaching waste residue;

[0029] (4) Extraction of gallium: add excess calcium carbonate to the gallium-containing leach solution in step (3), filter the obtained gallium-containing solution, and then extract metal gallium by electrowinning, and the electrowinning conditions are: electrolyte temperature 45 ℃, current density 200A / m 2 , the electrowinning time is 1h, the extraction rate of gallium obtained is above 81%, and the purity is above 99.5%;

[0030] (5) Gold leaching: Soak the leached res...

Embodiment 2

[0033] The filter residue of embodiment 1 step (5) gained is further processed:

[0034] (7) Separation of aluminum: mix the filter residue in step (5) with potassium pyrosulfate at a ratio of 1:3, send it into a high-temperature furnace, and dissolve it in water after calcination at a constant temperature of 450°C for 2 hours. The solid-to-liquid ratio is 1:50, and then Add 0.1mol / L sulfuric acid, adjust the pH value of the solution to about 2.0, and separate the solid and liquid by filtration to obtain the aluminum leaching solution;

[0035] (8) Extraction of alumina: Add 0.1mol / L NaOH solution to the leaching solution in step (7), adjust the pH value to about 5.0, filter and separate to obtain aluminum hydroxide, and then calcinate at 1050°C for 2 hours to obtain pure alumina. Among them, the extraction rate of aluminum reaches more than 95%.

Embodiment 3

[0037] (1) Coarse crushing and sorting: After cleaning and drying the waste LED lamps, the shells are broken, and the LED chips are sorted out;

[0038] (2) Crushing: Take the LED chip in step (1), and use ball milling process to grind the LED chip to 140 mesh;

[0039] (3) Separation of gallium: add the LED chip powder in step (2) to concentrated phosphoric acid, react at 155°C for 2 hours, then dilute 5 times, filter and separate to obtain gallium-containing leaching solution and leaching waste residue;

[0040] (4) Extraction of gallium: add excess calcium carbonate to the gallium-containing leach solution in step (3), filter the obtained gallium-containing solution, and then use the electrowinning method to extract metal gallium. The electrowinning conditions are: electrolyte temperature 35 ℃, current density 500A / m 2 , the electrowinning time is 0.5h, the extraction rate of gallium obtained is above 82%, and the purity is above 99.5%;

[0041] (5) Gold leaching: Soak th...

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PUM

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Abstract

The invention belongs to the field of waste resource comprehensive utilization, and in particular relates to a method for extracting rare and noble metals from waste LED (light-emitting diode) chips. The method for extracting rare and noble metals from waste LED chips provided by the invention comprises the following steps of: (1) coarse crushing and sorting; (2) crushing; (3) separating gallium; (4) extracting gallium; (5) leaching gold; and (6) extracting gold. The method combines a dry method technology with a wet method technology, is used for dissolving gallium and gold in the LED chips step by step, and has the characteristics of high recycling rate and simple recycling process operation. According to the invention, the waste LED chips are utilized effectively, thus the pollution and the damage to the environment by the waste LED lamps are reduced; and moreover, rare and noble metals are recycled, thus mineral resources are saved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of waste resources, in particular to a method for extracting rare and precious metals from waste LED lamps. Background technique [0002] As a new generation of energy-saving lamps, LEDs have been widely promoted and applied because of their small size, low energy consumption, long service life, high brightness, energy saving, environmental protection, and durability. The number of lamps reaches 128 billion, which contains a large amount of rare and precious metals, such as gallium, gold, etc. Such a huge number of LED lamps will be a huge treasure house of resources. [0003] If these LED lamps are discarded directly after being discarded, it will not only occupy a large amount of land resources, pollute the environment, but also cause a waste of metal resources. At present, there is no relevant patent report on the extraction of rare and precious metals in LED lamps. Contents of the in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B58/00C22B11/00
CPCY02P10/20
Inventor 刘庄黄旭江关豪元
Owner 荆门格林循环电子废弃物处置有限公司
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