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Burning-free non-cyaniding method for treating waste printed circuit board

A printed circuit board, cyanidation treatment technology, applied in the direction of printed circuit, printed circuit manufacturing, printed circuit secondary treatment, etc., can solve the problems of incomplete separation and recovery, low recovery rate of palladium, etc., to improve the recovery rate, Environmentally friendly and low energy consumption

Active Publication Date: 2012-09-19
JIANGXI GEM RESOURCES RECYCLING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lead-containing by-product Na in this method 2 PbO 3 and tin-containing by-product Na 2 SnO 3 Mixed and crystallized in the same step, not completely separated and recovered, and needs to be returned to the smelter of lead or tin for extraction
In addition, the method of recovering metallic silver in this method is to obtain electrodeposited silver by electrowinning after dissolving the silver-containing filter residue with nitric acid solution. However, when nitric acid dissolves silver, it also dissolves metallic palladium, which leads to the recovery of palladium during the subsequent recovery of coarse palladium powder. rate is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The method for treating waste printed circuit boards without incineration and without cyanide comprises the following steps:

[0050] (1) Desoldering treatment:

[0051] Get ferric nitrate or ferric chloride, sulfonic acid and dissolve completely in the water, add nitric acid according to the following ratio, stir evenly, make nitric acid type tin stripping solution of the present invention: nitric acid 50%, ferric nitrate 18%, sulfamic acid 5% %, the rest is water;

[0052] 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) .

[0053] (2) Separation of lead and tin:

[0054] 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;

[0055] At a temperatu...

Embodiment 2

[0068] The method for treating waste printed circuit boards without incineration and without cyanide comprises the following steps:

[0069] (1) Desoldering treatment:

[0070] Take ferric nitrate or ferric chloride, sulfonic acid and dissolve completely in water, add nitric acid according to the following ratio, stir evenly, make nitric acid type tin stripping solution of the present invention: nitric acid 15%, ferric nitrate 20%, sulfamic acid 5% %, the rest is water;

[0071] 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) .

[0072] (2) Separation of lead and tin:

[0073] Get the waste tin stripping solution described in step (1), record wherein tin-containing metal 60g / L, lead ion 24g / L, iron ion 19g / L and copper ion 9g / L;

[0074] At a temperature o...

Embodiment 3

[0087] The method for treating waste printed circuit boards without incineration and without cyanide comprises the following steps:

[0088] (1) Desoldering treatment:

[0089] Take ferric nitrate or ferric chloride, sulfonic acid and dissolve completely in water, add nitric acid according to the following ratio, stir evenly, make nitric acid type tin stripping solution of the present invention: nitric acid 50%, ferric chloride 1%, sulfamic acid 1%, the rest is water;

[0090] 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 25 minutes, and waste tin stripping solution enters step (2) ,.

[0091] (2) Separation of lead and tin:

[0092] Take the waste tin stripping solution described in step (1), and measure 60~100g / L of tin metal, 36g / L of lead ion, 24g / L of iron ion and 12g / L of copper ion in it;

[0093] At a temp...

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Abstract

The invention provides a burning-free non-cyaniding method for treating a waste printed circuit board. The method comprises the following steps of: sealing-off, lead and tin separation, crushing and electrostatic separation, and respective extraction of antimony, aluminum, copper, nickel, silver, gold, platinum and palladium. By the method disclosed by the invention, the maximization of valued metal resource recycling is realized, metallic lead and tin can be thoroughly separated and recovered, and at the same time the recovery rate of metallic palladium is improved.

Description

technical field [0001] The invention relates to the treatment of industrial waste, in particular to a method for treating waste printed circuit boards without burning or cyanide. Background technique [0002] With the improvement of people's living standards, the frequency of replacement of various household appliances is getting higher and higher, and the quantity of waste printed circuit boards (PCBs) produced by various waste household appliances is increasing. If these waste printed circuit boards are directly discarded, it will not only occupy a large amount of land resources, but also cause a waste of valuable metal resources, and various toxic and harmful substances such as polyvinyl chloride and halogenated flame retardants contained in them will damage the surrounding environment. The environment produces huge pollution. Therefore, how to effectively deal with waste printed circuit boards and realize the recycling and reuse of waste printed circuit boards has becom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/04C22B11/00C22B13/00C22B15/00C22B25/00
CPCH05K2203/178B09B3/0016B09B5/00C22B7/005C22B7/001B02C23/10H05K3/22Y10T29/49755Y10T29/49156Y02P10/20Y02P70/50Y02W30/82B09B3/80H05K1/00H05K3/225H05K3/26C22B11/046B02C23/08Y02W30/50
Inventor 许开华
Owner JIANGXI GEM RESOURCES RECYCLING CO LTD
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