A Method for Metal Recovery from Electronic Waste Using Conductive Polymer Hollow Fibers
A conductive polymer and electronic waste technology, applied in the direction of improving process efficiency, can solve the problems of a large amount of acid-base waste liquid, ecological environment and human health pollution, hazards, etc., to increase the specific surface area, realize resource recovery, The effect of simple process
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Embodiment 1
[0038] In this embodiment, the preparation process of the conductive polymer hollow fiber membrane is as follows:
[0039] (1) Mix polyaniline and polyvinylidene fluoride in a mass ratio of 3:1 to obtain a mixed material, and then add 1- Methyl-2-pyrrolidone, adding an appropriate amount of polyethylene glycol, and ultrasonicating for 1 hour at 60 °C to obtain a casting liquid;
[0040] (2) using the spinning method, inject the casting liquid obtained in the step (1) into the dry-wet spinning device, use the compressed air to extrude it from the spinneret and enter the gel tank through the dry spinning air layer , the polyaniline-polyvinylidene fluoride hollow fiber membrane can be obtained after precipitation gelation, stretching, leaching, soaking and other treatments.
[0041] The SEM image of the polyaniline-polyvinylidene fluoride hollow fiber obtained above is as follows figure 1 As shown, it can be seen that the hollow fiber material effectively increases the specific...
Embodiment 2-3
[0052] The nano-spinning in this example is exactly the same as that in Example 1, and both are polyaniline-polyvinylidene fluoride hollow fibers. The preparation method thereof is also exactly the same as that in Example 1.
[0053] In order to verify the ability of the polyaniline-polyvinylidene fluoride hollow fiber prepared above to adsorb and reduce gold (Au) ions in the hydrochloric acid leaching solution, the steps carried out are basically the same as those in Example 1, and the only difference is that in step (3) The PH values of the hydrochloric acid leaching solution prepared in the solution were 0.3 and 2.3, respectively.
[0054] The change of gold recovery rate with time after adding the polyaniline-polyvinylidene fluoride nano-spinning to the hydrochloric acid leaching solution is as follows: image 3 Example 2 and Example 3 in the branch are shown. It can be seen from this figure that, as in Example 1, the polyaniline-polyvinylidene fluoride hollow fiber ca...
Embodiment 4
[0056] In this embodiment, the preparation process of the conductive polymer hollow fiber membrane is as follows:
[0057] (1) Mix polypyrrole and polyimide in a mass ratio of 1:1 to obtain a mixed material, and then add the mixed material in a solid-liquid ratio of 1:20 (mixed material / g:solvent / ml) A sufficient amount of 1-methyl-2-pyrrolidone is added, an appropriate amount of polyethylene glycol and other additives are added, and the film is obtained by ultrasonicating at 60 ° C for 1 hour;
[0058] (2) using the spinning method, inject the casting liquid obtained in the step (1) into the dry-wet spinning device, use the compressed air to extrude it from the spinneret and enter the gel tank through the dry spinning air layer , the polypyrrole-polyimide hollow fiber membrane can be obtained after precipitation gelation, stretching, leaching, soaking and other treatments;
[0059] The SEM images of the polypyrrole-polyimide hollow fibers prepared above are similar figure 1...
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