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Method for recycling tin and lead from waste circuit board leach liquor

A recycling method and waste circuit board technology, applied in the direction of improving process efficiency, etc., can solve problems such as long time, and achieve the effects of improving production efficiency, shortening production time, and improving purity

Inactive Publication Date: 2013-07-24
刘景洋
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the chemical recovery step of this method takes a long time, so there is a need to provide a method of recovering tin and lead from scrap circuit boards that can shorten the production time

Method used

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  • Method for recycling tin and lead from waste circuit board leach liquor
  • Method for recycling tin and lead from waste circuit board leach liquor
  • Method for recycling tin and lead from waste circuit board leach liquor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for recovering tin and lead in the leaching solution of waste circuit boards, said recovery method comprising the steps of:

[0026] Step 1: First, add an organic solvent with a volume percentage of 0.2-0.8% to the waste circuit board extract to obtain a mixture of extracts; the waste circuit board extract is to soak the waste circuit board with nitric acid , after the electronic components on the waste circuit board fall off, the solution obtained after the mixture obtained after the soaking treatment is filtered;

[0027] The second step: carry out aeration treatment to the extract mixture, and the time of the aeration treatment is 20 to 50 minutes; the aeration treatment can accelerate the generation rate of stannic acid and shorten the separation time of stannic acid;

[0028] Step 3: Static precipitation treatment is carried out on the leaching solution mixture after the aeration treatment, to obtain stannic acid precipitation and the initial supernatant, ...

Embodiment 2

[0037] This embodiment is an improvement made on the basis of Embodiment 1. For the same part as Embodiment 1 in this embodiment, please refer to the content disclosed in Embodiment 1 for understanding, and the content disclosed in Embodiment 1 should also be used as this embodiment. The content of the example will not be repeated here.

[0038] In this embodiment, the organic solvent used is ethanol.

[0039] Ethanol is a non-toxic and cheap organic solvent. The ethanol used in this example is commercially available, and the volume percentage of ethanol is greater than 95%.

[0040] In order to further illustrate the effect of adding ethanol to promote precipitation, a comparative experiment was carried out in the laboratory. The specific experimental process is:

[0041] Into five 100ml measuring cylinders, respectively transfer 100ml of waste circuit board extract, number the 5 measuring cylinders 1, 2, 3, 4, 5, then add 0.2ml ethanol to 2# measuring cylinder with a pipet...

Embodiment 3

[0050] This embodiment is an improvement made on the basis of Embodiment 1. For the same part as Embodiment 1 in this embodiment, please refer to the content disclosed in Embodiment 1 for understanding, and the content disclosed in Embodiment 1 should also be used as this embodiment. The content of the example will not be repeated here.

[0051] In this embodiment, the organic solvent used is acetone.

[0052] The acetone used in this embodiment is commercially available, and the volume percentage of acetone is greater than 99.5%.

[0053] Concrete experimental process is identical with embodiment 2:

[0054] Into five 100ml measuring cylinders, respectively transfer 100ml of waste circuit board extract, number 5 measuring cylinders 6, 7, 8, 9, 10, then add 0.2ml acetone to 7# measuring cylinder with a pipette, Add 0.4ml acetone to 8# graduated cylinder, add 0.6ml acetone to 9# graduated cylinder, add 0.8ml acetone to 10# graduated cylinder, do not add acetone to 6# graduate...

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Abstract

The invention discloses a method for recycling tin and lead from waste circuit board leach liquor. The method comprises the following steps: adding a defined amount of organic solvent into the waste circuit board leach liquor, then classifying and precipitating the tin and lead in the leach liquor to precipitate, and recycling. By adopting the method disclosed by the invention, the precipitation rates of tin and lead in the waste circuit board leach liquor can be increased, the reaction time can be shortened, the production efficiency can be increased, and simultaneously the purity of the obtained product can be increased.

Description

technical field [0001] The invention belongs to the field of solid waste treatment, and in particular relates to a method for recovering tin and lead in the leaching solution of waste circuit boards. The method adopts a chemical method to recover heavy metals in the leach solution of waste circuit boards. Background technique [0002] The output of printed circuit boards in mainland China ranks first in the world, accounting for 26% of the world's total output, and is growing at an annual growth rate of about 15%. At the same time, the annual production of major electronic waste in my country is 1.5 million tons, and it is growing at a rate of 13% to 15% per year. The composition of electronic waste is complex, most of which contain toxic chemicals, more than half of which are harmful to human body, and some are even highly toxic. When electronic waste is landfilled or incinerated, the heavy metals in it seep into the soil and enter rivers and groundwater, which will cause...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/44C22B13/00C22B25/00
CPCY02P10/20
Inventor 刘景洋乔琦郭玉文
Owner 刘景洋
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