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Method for recovering gold and copper from waste mobile telephone

A mobile phone recycling, motherboard technology, applied in the direction of improving process efficiency, can solve the problems of long leaching time, air pollutant emission, low efficiency, etc., and achieve the effect of selective recycling

Inactive Publication Date: 2014-09-24
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The fire method can easily lead to the discharge of a large amount of air pollutants, and even produce secondary pollutants such as persistent organic compounds
Since most of the wet methods currently use aqua regia or cyanide-containing processes, it is inevitable to produce a large amount of toxic wastewater
The disadvantage of biotechnology is that its leaching time is long and the efficiency is low.

Method used

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  • Method for recovering gold and copper from waste mobile telephone
  • Method for recovering gold and copper from waste mobile telephone
  • Method for recovering gold and copper from waste mobile telephone

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as figure 1 As shown, the main board and components of the discarded mobile phone circuit boards are separated, and the components are sorted and processed separately. Add the waste mobile phone circuit board fragments that have been cut into the supercritical water oxidation reaction device, add 50 milliliters of deionized water and 40 milliliters of 30% hydrogen peroxide, and immediately seal the reaction kettle (you can also feed oxygen 1- 5 minutes to replace hydrogen peroxide), heating, start timing after the temperature rose to 400 degrees, at this moment, the pressure in the container was controlled at 23MPa by a manual pressurization device, and stopped heating after 60 minutes of reaction. After the temperature dropped to room temperature, the reaction device was opened, and the reactant was transferred to a centrifuge tube for centrifugation. Take 1 ml of the aqueous phase after centrifugation and dilute it to a constant volume, and then use ion chromato...

Embodiment 2

[0027] Such as figure 1 As shown, the main board and components of the discarded mobile phone circuit boards are separated, and the components are sorted and processed separately. Add the waste mobile phone circuit board fragments that have been cut into the supercritical water oxidation reaction device, add 90 milliliters of deionized water and 60 milliliters of 30% hydrogen peroxide, immediately seal the reaction kettle (you can also feed oxygen 1- 5 minutes to replace hydrogen peroxide), heating, start timing after the temperature rose to 250 degrees, at this moment, the pressure in the container was controlled at 12MPa by a manual pressurization device, and stopped heating after 30 minutes of reaction. After the temperature dropped to room temperature, the reaction device was opened, and the reactant was transferred to a centrifuge tube for centrifugation. Take 1 ml of the aqueous phase after centrifugation and dilute it to a constant volume, and then use ion chromatograp...

Embodiment 3

[0029] Such as figure 1 As shown, the main board and components of the discarded mobile phone circuit boards are separated, and the components are sorted and processed separately. Add the waste mobile phone circuit board fragments that have been cut into the supercritical water oxidation reaction device, add 50 milliliters of deionized water and 40 milliliters of 30% hydrogen peroxide, and immediately seal the reaction kettle (you can also feed oxygen 1- 5 minutes to replace hydrogen peroxide), heating, start timing after the temperature rose to 400 degrees, at this moment, the pressure in the container was controlled at 30MPa by a manual pressurization device, and stopped heating after 180 minutes of reaction. After the temperature dropped to room temperature, the reaction device was opened, and the reactant was transferred to a centrifuge tube for centrifugation. Take 1 ml of the aqueous phase after centrifugation and dilute it to a constant volume, and then use ion chromat...

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Abstract

The invention discloses a method for recovering gold and copper from a waste mobile telephone, which comprises the following steps: 1) processing a mainboard of a waste mobile telephone into fragments smaller than 1cm; 2) adding the fragments into a supercritical water oxidation reaction device, adding deionized water and 30% hydrogen peroxide, sealing, and controlling the solid-to-liquid ratio of the reactants to be (1:5)-(1:30)g / ml; 3) heating to 250-400 DEG C, controlling the pressure to be 12-30MPa by means of a manual pressurization device, reacting for 30-180 minutes, and then stopping heating; 4) after the reaction is completed, cooling to room temperature, then opening a reaction kettle, performing solid-liquid separation, soaking the solid phase in a 0.5-3mol / L sulfuric acid solution for 5-40 minutes, filtering, vaporizing to concentrate and crystallize the filtrate, and recovering a CuSO4 crystal product; and (5) drying the surplus solid residue, then soaking in a potassium iodide-iodine solution for 30-180 minutes, filtering to obtain a gold concentrated solution, and recovering.

Description

technical field [0001] The invention relates to the technical field of waste recovery and application, in particular, the invention relates to a method for recovering gold and copper from waste mobile phones. Background technique [0002] At present, about 400 million mobile phones are discarded every year in the world, of which nearly 100 million are in China, and the recycling rate is less than 1%. A recent report by the United Nations Environment Program predicts that by 2020, the number of discarded mobile phones in China will increase sevenfold compared to 2007. The circuit boards of discarded mobile phones contain valuable metals such as gold, silver, palladium, and copper. Gold concentrate (about 70g / t) is even higher. The circuit boards of discarded mobile phones also contain brominated flame retardants and other harmful substances. If they are discarded directly, they will seriously pollute the soil and groundwater. Therefore, it is meaningful to carry out resear...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C22B15/00
CPCY02P10/20
Inventor 修福荣齐莹莹
Owner FUJIAN UNIV OF TECH
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