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Nitrogen-rich porous material preparation method and application of nitrogen-rich porous material to recovery of precious metals in circuit board

A technology of porous materials and circuit boards, which is used in chemical instruments and methods, other chemical processes, and the improvement of process efficiency to achieve the effect of protecting the environment

Inactive Publication Date: 2017-11-03
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] However, how to apply the treatment liquid is a difficult problem in the treatment process of waste electrical appliances

Method used

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  • Nitrogen-rich porous material preparation method and application of nitrogen-rich porous material to recovery of precious metals in circuit board
  • Nitrogen-rich porous material preparation method and application of nitrogen-rich porous material to recovery of precious metals in circuit board
  • Nitrogen-rich porous material preparation method and application of nitrogen-rich porous material to recovery of precious metals in circuit board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In 1L of ethylene glycol, add 0.20mol of melamine and 0.30mol of p-benzoquinone, heat, stir, keep the temperature stable at 180°C for 5 hours, add 300mL of xylene, install a water separator, and set the temperature at 136-140°C for 5 hours The toluene was refluxed to take away the water, polycondensed for 4 hours, stopped stirring, naturally cooled to room temperature, filtered to obtain a brown precipitate, washed three times with 100 mL of ethanol, and dried in vacuum at 80°C to obtain 40.5 g of a brown blocky solid with a yield of 86.5%.

Embodiment 2

[0040] In 1L of ethylene glycol, add 0.19mol of melamine and 0.30mol of p-benzoquinone, heat and stir, keep the temperature stable at 180°C for 5 hours, add 300mL of xylene, install a water separator, and set the temperature at 136-140°C Toluene was refluxed to take away water, polycondensed for 4 hours, stopped stirring, naturally cooled to room temperature, filtered to obtain a brown precipitate, washed three times with 100 mL of ethanol, and dried under vacuum at 80°C to obtain 35.6 g of a brown solid with a yield of 80.1%.

Embodiment 3

[0042] In 1L of ethylene glycol, add 0.22mol of melamine and 0.30mol of p-benzoquinone, heat, stir, keep the temperature stable at 180°C for 5 hours, add 300mL of xylene, install a water separator, and set the temperature at 136-140°C Toluene was refluxed to take away water, polycondensed for 4 hours, stopped stirring, naturally cooled to room temperature, filtered to obtain a brown precipitate, washed three times with 100 mL of ethanol, and dried in vacuum at 80°C to obtain 40.2 g of a brown solid with a yield of 85.9%.

[0043] It can be seen from Examples 1-3 that when the molar ratio of melamine to p-benzoquinone is 1.9-2.2:3, the reaction yield is higher. According to the molar ratio of melamine and p-benzoquinone being 2:3, it will be further elaborated in the examples.

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Abstract

The invention relates to a nitrogen-rich porous material preparation method and application of a nitrogen-rich porous material to recovery of precious metals in a circuit board. The nitrogen-rich porous material preparation method comprises the following steps: taking ethylene glycol as a solvent; adding melamine and p-benzoquinone; performing heating polycondensation; and at last, adding dimethylbenzene for dehydration to obtain the porous material MOPs-1. The invention provides the efficient precious metal adsorption material MOPs-1, a thiourea leaching agent is taken as a waste circuit board processing liquid to study the function of the porous material, and the porous material can efficiently adsorb the precious metals in a thiourea solution, so that the thiourea solution can be used repeatedly, accordingly, recycling of electronic wastes is realized, the precious metals in the electronic waste are recovered, plastic is recycled, the environment is protected, and economic and social benefits are produced.

Description

technical field [0001] The invention relates to the field of novel porous materials, in particular to a preparation method of a nitrogen-rich porous material and its application in recycling circuit boards of precious metals. Background technique [0002] In 2016, the world produced up to 50 million tons of waste electrical appliances. According to the United Nations Environment Program report, China is the second largest producer of e-waste, with more than 2.3 million tons of e-waste per year, second only to the 3 million tons of the United States. About 350 million tons of e-waste flows into China through various channels around the world every year. If these electronic wastes are not treated, they will not only have a serious impact on the environment, but also cause a serious waste of resources. According to statistics, an average of 1 ton of ordinary electronic waste contains 490kg of metal, 4kg of wires, 12kg of circuit boards, etc. If it is not recycled, it will ca...

Claims

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Application Information

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IPC IPC(8): B01J20/26B01J20/30C22B3/24C22B11/00
CPCB01J20/262C22B3/24C22B11/046Y02P10/20
Inventor 张超智李世娟
Owner NANJING UNIV OF INFORMATION SCI & TECH
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