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Treatment method for selectively adsorbing and recycling precious metal ions in wastewater by using modified polymer adsorbent

A precious metal ion and treatment method technology, applied in the field of precious metal recovery, can solve the problems of low adsorption rate of adsorbent, can not be widely used, increase production cost, etc., achieve the effect of fast adsorption rate, strong load stability, and increase adsorption rate

Active Publication Date: 2021-07-23
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Commonly used adsorbents include polythioamide linear polymer adsorbents, however, due to the raw material cost of the precursors for the synthesis of polythioamide linear polymers Higher, greatly increasing its production cost, making it not widely used
Sorbent adsorption rates of polythioamide polymers are relatively slow, resulting in longer processing times

Method used

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  • Treatment method for selectively adsorbing and recycling precious metal ions in wastewater by using modified polymer adsorbent
  • Treatment method for selectively adsorbing and recycling precious metal ions in wastewater by using modified polymer adsorbent
  • Treatment method for selectively adsorbing and recycling precious metal ions in wastewater by using modified polymer adsorbent

Examples

Experimental program
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Effect test

preparation example 1

[0076] Preparation Example 1 A preparation method of a modified polymer adsorbent, comprising the steps of:

[0077] (1) Weigh 48.1mg of elemental sulfur, 145.6mg of terephthalic acid, 58.1mg of hexamethylenediamine and 24mg of activated carbon into a 20mL pressure-resistant tube, add 2mL of N,N-dimethylacetamide, add a magnetic rotor and stir for 12 minutes , placed in an ultrasonic instrument and ultrasonicated for 12 minutes to obtain a solid-liquid mixture;

[0078] (2) Vacuumize the solid-liquid mixture obtained in step (1) until there are no bubbles, fill it with nitrogen, and heat it to 100° C. to react for 15 hours to obtain a modified polymer mixture;

[0079] (3) Add 4 mL of N,N-dimethylformamide to the modified polymer mixture obtained in step (2), stir for 10 minutes, slowly add it dropwise to 100 mL of methanol, centrifuge for 5 minutes, remove the supernatant and collect Precipitate; then wash the precipitate with methanol, centrifuge again after washing for 5...

Embodiment 1

[0085] Example 1 A method for treating waste water utilizing a modified polymer adsorbent, comprising the steps of:

[0086] (1) Select the waste water of a certain type of waste CPU after dissolving N-bromosuccinimide and pyridine as the CPU waste water to be treated, and the metal dissolves into the solution in the form of ions (including gold, copper, nickel, cobalt, cadmium, cesium ,manganese);

[0087] (2) Send the CPU waste water into the adjustment pool, detect the pH of the incoming water through the pH detector, and feed back to the pH controller to control the automatic opening and closing of the acid / alkali dosing pump, thereby adjusting the pH value of the CPU waste water to 3.0. After the adjustment is completed CPU waste water enters the dosing unit;

[0088] (3) According to the concentration of the precious metals fed back by the influent water volume fed back by the electromagnetic flowmeter and the precious metals online analyzer, the dosage of the modifie...

preparation example 2

[0095] Preparation example 2A method for preparing a modified polymer adsorbent that selectively adsorbs and recovers precious metal ions, comprising the following steps:

[0096] (1) Weigh 481mg of elemental sulfur, 1750mg of piperazine, 1660mg of terephthalaldehyde and 200mg of polyurethane into a pressure-resistant tube, add 20mL of N,N-dimethylacetamide, add a magnetic rotor to stir for 12 minutes, and put it into an ultrasonic instrument Ultrasound for 12 minutes to obtain a solid-liquid mixture;

[0097] (2) Vacuumize the solid-liquid mixture obtained in step (1) until there are no bubbles, fill it with nitrogen, and heat it to 100° C. to react for 15 hours to obtain a modified polymer mixture;

[0098] (3) Slowly add the modified polymer mixture obtained in step (2) dropwise into 200mL methanol, centrifuge for 5 minutes, remove the supernatant to collect the precipitate; then wash the precipitate with methanol, and centrifuge again after washing Treat for 5 minutes, ...

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Abstract

The invention provides a treatment method for selectively adsorbing and recycling precious metal ions in wastewater by using a modified polymer adsorbent, and belongs to the technical field of precious metal wastewater treatment. The modified polymer adsorbent is prepared by the following steps: (1) mixing elemental sulfur, a polyamine compound, a polycarbonyl compound and a loading substrate, and adding an organic solvent to obtain a solid-liquid mixed solution; (2) in a protective gas atmosphere, carrying out a heating reaction on the solid-liquid mixed solution to obtain a modified polymer mixed solution; and (3) cooling the modified polymer mixed solution to room temperature, washing, centrifuging and drying to obtain a modified polymer adsorbent, wherein the load substrate is a porous adsorption material. According to the treatment method, the characteristics and advantages of the medicament can be fully exerted, so that the adsorbent has the effects of high selectivity, high adsorption capacity, high adsorption rate, stable performance and the like on noble metal ions, and the noble metal is recovered through the separation and recovery unit in the later stage.

Description

technical field [0001] The invention belongs to the technical field of precious metal recovery, and in particular relates to a treatment method for selectively absorbing and recovering precious metal ions in wastewater by using a modified polymer adsorbent. Background technique [0002] Precious metals are often used in jewelry, catalysis, electronic devices, etc., but they are found in low levels in the natural environment, so their recovery and separation are crucial. At present, the main sources of precious metal recovery are non-ferrous metallurgy and secondary resources. For example, the content of gold and other precious metals in non-ferrous metallurgy wastewater is about 0-10mg / L, and its huge discharge makes the content of precious metals very considerable; secondary resources The electronic waste in China is called "sleeping minerals". For example, one ton of discarded mobile phones contains more than 270g of gold. [0003] The methods used to recover precious met...

Claims

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Application Information

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IPC IPC(8): C02F1/28B01J20/22B01J20/26C02F101/20
CPCC02F1/285B01J20/265B01J20/22C02F2209/06C02F2209/40C02F2101/20Y02P10/20
Inventor 兰华春赵文金苗时雨安晓强刘会娟曲久辉
Owner TSINGHUA UNIV
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