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Method for recovering metals from electronic waste using conductive polymer porous separation membrane

A conductive polymer, porous separation membrane technology, applied in the direction of improving process efficiency, can solve the problems of ecological environment and human health pollution and harm, and achieve the effect of improving recovery efficiency, simplifying treatment equipment, and improving recovery rate

Active Publication Date: 2016-10-05
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the process of reducing and recovering precious metals, a large amount of highly toxic reagents such as fluoride and cyanide are often consumed and a large amount of acid-base waste liquid is generated. If proper methods are not used to treat them, it will cause serious damage to the ecological environment and human health. serious pollution and hazards

Method used

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  • Method for recovering metals from electronic waste using conductive polymer porous separation membrane
  • Method for recovering metals from electronic waste using conductive polymer porous separation membrane
  • Method for recovering metals from electronic waste using conductive polymer porous separation membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Mix polyaniline and polyvinylidene fluoride at a mass ratio of 3:1, and then add the polymer mixture to 1-methanol at a solid-to-liquid ratio of 1:5 (polymer mixture / g:solvent / ml) Base-2-pyrrolidone, sonicated at 60°C for 1 hour to form a polyaniline-polyvinylidene fluoride mixed solution.

[0037] (2) Take 2ml of the polyaniline-polyvinylidene fluoride mixed solution obtained in step (1) and drop it on a clean glass plate, and spread it on the surface of the glass plate to form a liquid polymer with a width of about 2cm and a length of about 10cm. coating, and then put it into deionized water together with the glass plate, so that the polymer coating is rapidly cured to form a separation film and fall off from the glass plate.

[0038] (3) Immerse the solid polyaniline-polyvinylidene fluoride separation membrane obtained in step (2) in a sufficient amount of deionized water to completely remove the organic solution and form micropores in the separation membrane to ...

Embodiment 2

[0047] Examples 2 and 3 are basically the same as in Example 1, the difference is that in Example 2 polyaniline and polyvinylidene fluoride are mixed according to a mass ratio of 1:1, and in example 3 polyaniline and polyvinylidene fluoride Mix according to the mass ratio of 1:3.

[0048] Observe the change of gold content over time in the hydrochloric acid leaching solution in the above-mentioned embodiment 1-3 in step (4) process, obtain as follows Figure 4 Reaction kinetics diagram of the gold components shown. It can be seen from this figure that the use of polyaniline-polyvinylidene fluoride porous separation membranes can conveniently and efficiently recover gold components in the acid leaching solution.

[0049] In the same way, after experiments, it was found that the above-mentioned polyaniline-polyvinylidene fluoride porous separation membrane can conveniently and efficiently recover components such as mercury, silver, tin, chromium, platinum, and palladium in the ...

Embodiment 4

[0051] (1) Mix polypyrrole and polyimide at a mass ratio of 1:1, and then add the polymer mixture to 1-methanol at a solid-to-liquid ratio of 1:20 (polymer mixture / g:solvent / ml) Base-2-pyrrolidone, ultrasonic at 60°C for 1 hour to form a polypyrrole-polyimide solution;

[0052] (2) Take 2ml of the polypyrrole-polyimide mixed solution obtained in step (1) and drop it on a clean glass plate, and use a special tool to spread it on the surface of the glass plate to form a shape about 2cm wide and 10cm long. The liquid polymer coating, and then put it into deionized water together with the glass plate, so that the polymer coating is rapidly solidified to form a separation film and fall off the glass plate;

[0053] (3) Soak the solid polypyrrole-polyimide separation membrane obtained in step (2) in a sufficient amount of deionized water to completely remove the organic solution and form micropores in the separation membrane to obtain polypyrrole-polyimide Porous separation membran...

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Abstract

The invention provides a method for recycling metals from electronic wastes. In the provided method, the electronic wastes are extracted by acid in advance, and then the liquid extract goes through a conductive polymer porous membrane, wherein during the process, the metal ions in the liquid extract are absorbed and reduced by the conductive polymer molecules in the porous separating membrane; and then the reduced metal ions are subjected to high-temperature melting so as to obtain metal simple substances. Compared with the prior art, the conductive polymer material is made into a porous membrane, the specific surface area of the conductive polymer material is effectively enlarged, and thus the recovery rate is increased. Furthermore, the process of absorbing metal ions from acidic extract liquid by the conductive polymer material is converted from a static adsorption mode into a dynamic adsorption mode by the porous structure; so that the technology procedure of mixing and then separating acidic extract liquid of electronic wastes and the conductive polymer material is cancelled, thus the treatment equipment is largely simplified, and the method is very suitable for massive treatment and has a very good application prospect.

Description

technical field [0001] The invention belongs to the technical field of recycling and processing of electronic waste, and in particular relates to a method for recovering metal from electronic waste by using a conductive polymer porous separation membrane. Background technique [0002] Electronic waste (such as waste printed circuit boards, etc.) is rich in precious and rare metals such as gold, silver, palladium, platinum, etc., and its grade is dozens of times that of ordinary primary ore, known as "urban mines". Therefore, as the solid waste with the fastest growth and containing huge social wealth and resources, the recycling of electronic waste has become a sunrise industry in the metal recycling industry at home and abroad. [0003] At present, for the treatment of electronic waste and the recovery of metal resources, the combination of physical and chemical methods is the most widely used method, and the chemical method mostly uses hydrometallurgical technology. The t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00
CPCY02P10/20
Inventor 刘钢李润伟巫远招潘亮张文斌
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI