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Bottom circuit board full-component microwave fast digestion and precious metal ionic liquid extracting method

A precious metal ion, waste circuit board technology, applied in the direction of improving process efficiency, to avoid heat loss, strong selectivity, and non-volatile effects

Active Publication Date: 2020-05-19
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is mainly to solve the problems of rapid microwave digestion of all components of waste circuit boards and extraction of precious metal ionic liquids

Method used

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  • Bottom circuit board full-component microwave fast digestion and precious metal ionic liquid extracting method
  • Bottom circuit board full-component microwave fast digestion and precious metal ionic liquid extracting method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Cut the waste circuit board into small pieces, each weighing 0.1g, to obtain the pretreated waste circuit board; configure a precious metal extraction solution in a beaker, the concentration is thiourea: 1.5mol / L, sulfuric acid 1.5mol / L, over Sodium oxide 2mol / L; put the pretreatment circuit board in the digestion tank, pour the leaching solution into the digestion tank at the same time, set the microwave digestion instrument to heat up to 185°C for 1h, holding time for 20min, cooling time for 15min, and cool to 60°C, after cooling, filter to obtain precious metal leaching solution and resin-containing waste residue; put the precious metal leaching solution in the extraction tank, add imidazole ionic liquid [BMIM][NTF2] according to the volume ratio of ionic liquid to precious metal leaching solution 1:1, and stir thoroughly After 5 minutes, the oil and liquid phases were fully mixed to obtain the oil and liquid mixed phase. Add oxalic acid solution to the organic phase...

example 2

[0021] Cut the waste circuit board into small pieces, each weighing 0.15g, to obtain the pretreated waste circuit board; configure a precious metal extraction solution in a beaker, the concentration is thiourea: 2mol / L, sulfuric acid 1.8mol / L, peroxide Sodium 1.5mol / L; put the pretreatment circuit board in the digestion tank, pour the extract solution into the digestion tank at the same time, set the microwave digestion instrument to heat up to 180°C for 1.2h, holding time 20min, cooling time 25min, cooling to 60°C, after the cooling is completed, filter to obtain the precious metal leachate and resin-containing waste residue; place the precious metal leachate in the extraction tank, add imidazole ionic liquid [BMIM][NTF2] according to the volume ratio of the ionic liquid to the precious metal leachate 1:2, fully Stir for 8 minutes to fully mix the oil and liquid phases to obtain the oil and liquid mixed phase. Add oxalic acid solution to the organic phase at a volume ratio of...

example 3

[0023]Cut the waste circuit board into small pieces, each weighing 0.18g, to obtain the pretreated waste circuit board; configure a precious metal extraction solution in a beaker, the concentration is thiourea: 3.5mol / L, sulfuric acid 2mol / L, peroxide Sodium 2.5mol / L; put the pretreatment circuit board in the digestion tank, pour the extract solution into the digestion tank at the same time, set the microwave digestion instrument to heat up to 190°C for 1.5h, holding time 20min, cooling time 20min, cooling to 60°C, after the cooling is completed, filter to obtain precious metal leachate and resin-containing waste residue; place the precious metal leachate in an extraction tank, add imidazole ionic liquid [BMIM][NTF2] according to the volume ratio of ionic liquid to precious metal leachate 1:3, fully Stir for 12 minutes to fully mix the oil and liquid phases to obtain the oil and liquid mixed phase. Add oxalic acid solution to the organic phase according to the volume ratio of ...

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Abstract

The invention discloses a bottom circuit board full-component microwave fast digestion and precious metal ionic liquid extracting method, and belongs to the field of hydrometallurgy. Based on the theory that microwaves can directly penetrate through a leaching medium to directly heat a circuit board, microwave-assisted leaching can reinforce mass transfer and heat transfer in the traditional leaching process, the leaching time is greatly shortened, and the leaching efficiency is improved. Before leaching, a waste circuit board does not need to be smashed, and environmental protection is achieved while energy is saved. The temperature rising process and reaction time of the reaction can be controlled, the whole process is conducted under the airtight condition, heat loss in the leaching process is avoided, the valuable leaching rate is high, the selectivity is high, and efficient leaching of valuable metal can be achieved. Precious metal leachate is extracted through imidazolium ionic liquid, the selectivity of the imidazolium ionic liquid to gold is high, and the co-extraction phenomenon of gold, nickel, copper and other ions is avoided. The method for extracting the precious metalleachate through ionic liquid is a green and clean recycling method, and the overall recycling rate of gold, nickel and copper can reach 99% or above.

Description

technical field [0001] The invention relates to a method for rapid microwave digestion of all components of waste circuit boards and extraction of precious metal ionic liquids, in particular to microwave-assisted high-efficiency separation of precious metals from waste circuit boards and clean and efficient extraction of ionic liquids. Background technique [0002] In recent years, with population growth, rapid economic growth, continuous technological innovation, improved living standards, shortened lifespan of electronic and electrical equipment, and changes in consumer attitudes, the amount of used electronic waste that requires safe management has increased significantly. Waste circuit boards are common components of electrical and electronic equipment, and are also core components of electronic waste. The circuit board is composed of an insulating substrate made of glass fiber and epoxy resin, copper foil for conductive paths, and electronic components soldered on its s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00C22B15/00C22B3/36C22B23/00
CPCC22B7/007C22B11/046C22B15/0089C22B23/0461C22B3/362Y02P10/20C22B15/0071C22B23/043
Inventor 吴玉锋焉杰文李彬
Owner BEIJING UNIV OF TECH
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