Method for pretreating incineration ash of circuit board and recovering bromine

A recovery method and circuit board technology, which is applied in the direction of improvement of process efficiency, copper sulfate, lead sulfate, etc., can solve the problem that valuable metals cannot be completely recovered, and achieve the effect of no tail liquid discharge and high added value of recovery

Active Publication Date: 2018-06-05
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method correspondingly reduces the load of the fire method, reduces the cumulative effect of Zn, Pb and other impurity ions, and plays a certain positive role in improving the quality of electrical copper products. However, this method has the problem of secondary soot disposal and cannot completely recover valuable Metal

Method used

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  • Method for pretreating incineration ash of circuit board and recovering bromine
  • Method for pretreating incineration ash of circuit board and recovering bromine
  • Method for pretreating incineration ash of circuit board and recovering bromine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Follow the steps below to recycle:

[0037] (1) Mixed alkali leaching: carry out mixed alkali leaching with circuit board incineration smoke ash, leachate is made up of the mixed solution of sodium hydroxide and ammoniacal liquor, wherein the mass percent concentration of sodium hydroxide is 5%, the mass percent concentration of ammoniacal liquor is 5%, soot and The solid-to-liquid ratio of the leaching solution is 1:5 kg / liter, the leaching temperature is 35°C, stir and blow in air, the blowing air volume per cubic meter of leaching solution is 0.01 cubic meters per minute, after leaching for 1 hour, stop blowing in the air and continue stirring , adding 1 gram of copper powder per liter of leaching solution, and filtering after reacting for 10 minutes, to obtain mixed alkali leaching residue and mixed alkali leaching solution;

[0038] (2) Copper extraction and back extraction: the mixed alkali leach solution obtained in step (1) adopts N902 to carry out copper extrac...

Embodiment 2

[0059] Follow the steps below to recycle:

[0060] (1) mixed alkali leaching: carry out mixed alkali leaching with circuit board incineration soot, leachate is made up of the mixed solution of sodium hydroxide and ammoniacal liquor, wherein the mass percentage concentration of sodium hydroxide is 20%, the mass percentage concentration of ammoniacal liquor is 20%, soot and The solid-to-liquid ratio of the leaching solution is 1:10 kg / liter, the leaching temperature is 55°C, stir and blow in air, the blowing air volume per cubic meter of leaching solution is 0.1 cubic meters per minute, after leaching for 2 hours, stop blowing in the air and continue stirring , adding 3 grams of copper powder per liter of leaching solution, and filtering after 30 minutes of reaction to obtain mixed alkali leaching residue and mixed alkali leaching solution;

[0061] (2) Copper extraction and back extraction: the mixed alkali leach solution obtained in step (1) adopts N902 to carry out copper ext...

Embodiment 3

[0071] Follow the steps below to recycle:

[0072] (1) mixed alkali leaching: carry out mixed alkali leaching with circuit board incineration soot, leachate is made up of the mixed solution of sodium hydroxide and ammoniacal liquor, wherein the mass percentage concentration of sodium hydroxide is 15%, the mass percentage concentration of ammoniacal liquor is 10%, soot and The solid-liquid ratio of the leaching solution is 1:8 kg / liter, the leaching temperature is 40°C, stir and blow in air, the blowing air volume per cubic meter of leaching solution is 0.05 cubic meters per minute, after leaching for 1.5 hours, stop blowing in the air and continue stirring , adding 1 to 3 grams of copper powder per liter of leaching solution, and filtering after reacting for 10 to 30 minutes to obtain mixed alkali leaching residue and mixed alkali leaching solution;

[0073] (2) Copper extraction and back extraction: the mixed alkali leach solution obtained in step (1) adopts N902 to carry out...

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PUM

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Abstract

The invention discloses a method for pretreating incineration ash of a circuit board and recovering bromine, belongs to the field of comprehensive recovery of ash whole-wet valuable metal and particularly relates to a method for recovering valuable metal, enriching precious metal and recovering bromine salt in the pretreatment process of incineration ash of the circuit board. The method mainly comprises the steps: extracting mixed alkali; recovering copper by copper extraction and back extraction; carrying out neutralization and precipitation to separate lead and zinc; evaporating and crystallizing bromine; regenerating mixed alkali extracting liquor; removing zinc by acid pickling; evaporating and crystallizing zinc; carrying out zinc and copper removal on mixed alkali extracting residuesand the like. Compared with a traditional ash comprehensive process, the technology disclosed by the invention has the advantages that recovery of valuable metals such as copper, zinc and lead and enrichment of precious metal such as silver in the pretreatment process of the ash is realized to the maximum extent; meanwhile, the bromine salt is separated and recovered; the method has the characteristics of high recovery added value, no tail liquid drainage and the like.

Description

technical field [0001] The invention relates to the field of comprehensive recovery of valuable metals by soot all-wet method, in particular to methods for recovery of valuable metals, enrichment of precious metals and recovery of bromine salts in the pretreatment process of circuit board incineration soot. Background technique [0002] Circuit boards are an important part of electrical and electronic products and the foundation of modern electrical and electronic industries. Integrated circuit boards are mainly copper clad laminates composed of electronic components, glass fiber reinforced epoxy resin, and many metal materials including precious metals. Waste printed circuit boards (WPCB) contain a large amount of valuable metals such as gold, silver and palladium, which are much higher than the original mineral deposits and have great recycling value. At the same time, the composition of WPCB is complex and contains various harmful substances such as heavy metals and brom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B3/12C22B3/30C22B3/44C22B13/00C22B15/00C22B19/30C22B3/08C22B7/04C01G3/10C01F11/46C01G21/20C01G9/06
CPCC22B3/08C22B3/12C22B3/44C22B7/007C22B7/008C22B7/02C22B7/04C22B13/045C22B15/0065C22B15/0071C22B19/30C01F11/46C01G3/003C01G3/10C01G9/06C01G21/20C22B3/30Y02P10/20C01G21/14C01G1/06
Inventor 吴玉锋潘德安李彬左铁镛
Owner BEIJING UNIV OF TECH
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