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Treatment method for waste printed circuit board

A printed circuit board and waste technology, which is applied in the field of industrial waste treatment, can solve the problems of increasing industrialization cost, environmental pollution, and no solution, and achieves the effect of solving environmental pollution and environmental friendliness.

Active Publication Date: 2012-10-10
JIANGXI GREEN ECO MFG RESOURCE CYCLE
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  • Summary
  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

However, in this method, metal lead forms an alloy with copper in a liquid state, and part of it volatilizes at high temperature to form harmful gases, which has potential pollution to the environment. In order to avoid such environmental pollution, waste gas and dust need to be connected to the tail gas treatment system in this method. Centralized processing, which puts forward higher requirements on system equipment and increases the cost of industrialization
In addition, the patent application only pointed out that the incineration tail gas is discharged after passing through the tail gas treatment system, but did not give a specific solution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The method for treating waste printed circuit boards without incineration and without cyanide comprises the following steps:

[0038] (1) Desoldering treatment:

[0039] Get ferric nitrate or ferric chloride, sulfonic acid and dissolve in water completely, add nitric acid according to the following ratio, stir evenly, make nitric acid type tin stripping solution of the present invention: nitric acid 40%, ferric nitrate or ferric chloride 16%, 4% sulfonic acid, the rest is water;

[0040] Take the waste printed circuit board, clean and dry, soak in nitric acid type tin stripping solution for desoldering treatment, the waste printed circuit board enters step (3) after desoldering treatment for 10 minutes, and waste tin stripping solution enters step (2) .

[0041] (2) Separation of lead and tin:

[0042] Get the waste tin stripping solution described in step (1), record wherein tin-containing metal 60g / L, lead ion 22g / L, iron ion 19g / L and copper ion 10g / L;

[0043] A...

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PUM

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Abstract

The invention provides a treatment method for a waste printed circuit board, which comprises the following steps of: wet sealing-off treatment, separation of lead and tin, rough crushing, magnetic separation of iron, vortex separation, fine crushing and separation of fine nonmetal powder, electrostatic separation of metal and nonmetal in coarse mixture, recovery of heat energy through fire burning and harmless treatment of harmful tail gas. The invention combines wet sealing-off, decomposing classification and fire burning to reasonably recover usable resources, and is environment-friendly.

Description

technical field [0001] The invention relates to the processing of industrial waste, in particular to a method for processing waste printed circuit boards. Background technique [0002] As the supporting body for the electrical connection of electronic components in electrical products, printed circuit boards are increasingly being eliminated with the acceleration of the replacement of various electrical products. If these waste printed circuit boards are directly discarded, it will occupy a large amount of land resources and cause a waste of valuable metal resources, including rare and precious metals such as gold, silver and palladium. In addition, the printed circuit board substrate is basically a polymer material (mainly single-layer or multi-layer glass fiber cloth compounded with resin such as epoxy, and partially combined with metal pins and plastic pins), which is not easy to degrade. Various toxic and harmful substances such as polyvinyl chloride and halogenated fla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/06C22B3/44C22B13/00C22B25/00
CPCY02P10/20
Inventor 许开华曹卉
Owner JIANGXI GREEN ECO MFG RESOURCE CYCLE
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