Technology for comprehensively recycling rare noble metals in waste LED (light-emitting diode)
A technology of rare and precious metals and craftsmanship, applied in the field of comprehensive utilization of waste resources, can solve problems such as waste of metal resources, pollution of the environment, occupation of land resources, etc., and achieve significant economic and social value
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0022] Example 1 A method of extracting rare and precious metals—gallium and gold from waste LEDs
[0023] (1) Coarse crushing and sorting: After cleaning and drying the waste LED chips, the shell is broken, and the LED chips are partially sorted out;
[0024] (2) Crushing: take the LED chip in step (1), and use ball milling process to grind the LED chip to 120 mesh;
[0025] (3) Separation of gallium: Add the LED chip powder in step (2) to 0.05 mol / L KOH solution, and add a certain amount of potassium persulfate catalyst so that the concentration of the catalyst in the solution is 0.1 mol / L, and then The solution was kept at a temperature of 40 °C for 12 h, and continuously irradiated with an ultraviolet lamp with a wavelength of 367 nm. After the reaction was completed, it was separated by filtration to obtain a filtrate and a filter residue;
[0026] (4) Gallium extraction: adjust the pH value of the gallium-containing solution in step (3) to 5 with hydrochloric acid with...
Embodiment 2
[0029] Example 2 On the basis of Example 1, the method for further extracting alumina
[0030] On the basis of embodiment one, further extracting alumina comprises the following steps:
[0031] (1) Separation of aluminum: Mix the filter residue and NaOH in step (5) of the above method evenly at a ratio of 1:5, send it into a high-temperature furnace, and dissolve it in water after calcination at a constant temperature of 550 °C for 1 h. The solid-to-liquid ratio is about 1 :50, then add the sulfuric acid of 0.005 mol / L, adjust the pH value of the solution to 2, filter and separate the solid and liquid, to obtain the aluminum leaching solution;
[0032] (2) Extraction of alumina: add 0.05 mol / L NaOH solution to the above aluminum leaching solution, adjust the pH value to 5, filter and separate to obtain aluminum hydroxide, and then calcinate at 900 °C for 1 h to obtain pure alumina.
Embodiment 3
[0033] Example 3 Method of Extracting Rare and Precious Metals—Gallium and Gold and Aluminum Oxide from Waste LEDs
[0034] (1) Coarse crushing and sorting: After cleaning and drying the waste LED chips, the shell is broken, and the LED chips are partially sorted out;
[0035] (2) Crushing: take the LED chip in step (1), and use ball milling process to grind the LED chip into 150-mesh powder;
[0036] (3) Separation of gallium: Add the LED chip powder in step (2) to 0.05 mol / L NaOH solution, and add a certain amount of potassium persulfate as a catalyst so that the concentration of the catalyst in the solution is 0.05 mol / L, and then The solution was kept at a constant temperature of 95 °C for 4 h, and continuously irradiated with an ultraviolet lamp with a wavelength of 254 nm. After the reaction was completed, it was filtered and separated with medium-speed filter paper and washed with water three times to obtain the filtrate and filter residue;
[0037] (4) Gallium extra...
PUM
| Property | Measurement | Unit |
|---|---|---|
| wavelength | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More