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Method utilizing conductive polymer porous separating membrane to recycle metals from electronic wastes

A conductive polymer and porous separation membrane technology, applied in the direction of improving process efficiency, can solve the problems of ecological environment and human health pollution, hazards, etc., and achieve the effects of improving recovery efficiency, simplifying processing equipment, and increasing specific surface area

Active Publication Date: 2015-05-20
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 utilizing conductive polymer porous separating membrane to recycle metals from electronic wastes
  • Method utilizing conductive polymer porous separating membrane to recycle metals from electronic wastes
  • Method utilizing conductive polymer porous separating membrane to recycle metals from electronic wastes

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-form at a solid-to-liquid ratio of 1:5 (polymer mixture / g: solvent / ml) In the 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 flat on the surface of the glass plate to form a liquid polymer with a width of about 2cm and a length of about 10cm The coating is then put into deionized water together with the glass plate to quickly solidify the polymer coating to form a separation film and fall off the glass plate.

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

Embodiment 2

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

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

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

Embodiment 4

[0051] (1) Mix the polypyrrole and polyimide according to the mass ratio of 1:1, and then add the polymer mixture to 1-form at a solid-to-liquid ratio of 1:20 (polymer mixture / g: solvent / ml) In -2-pyrrolidone, sonicate 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 special tools to spread it on the surface of the glass plate to form a width of about 2cm and a length of about 10cm The liquid polymer coating is then put into deionized water together with the glass plate, so that the polymer coating is quickly solidified to form a separation film and fall off the glass plate;

[0053] (3) Immerse the solid polypyrrole-polyimide separation membrane obtained in step (2) in sufficient 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 electronic waste recycling and treatment, and specifically relates to a method for recovering metals 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 metals and rare metals such as gold, silver, palladium, platinum, and its grade is dozens of times that of ordinary primary ore. It is called "urban mine". Therefore, as the fastest growing solid waste that also contains 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 most used method is a combination of physical and chemical methods, and the chemical method mostly uses hydrometallurgical technology. The technology is specifi...

Claims

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Application Information

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Patent Type & Authority Applications(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
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