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Method for treating waste mobile phone circuit board and recovering precious metals

A precious metal and circuit board technology, applied in the field of mobile phone circuit board processing, can solve the problems of high processing cost, environmental pollution, waste of valuable resources, etc., achieve good processing effect, high added value, and avoid waste

Active Publication Date: 2014-03-05
DALIAN DONGTAI INDAL WASTE TREATMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] To sum up, at this stage, the waste mobile phone treatment method can only continue to recycle a single component, which will cause a waste of other valuable resources and may cause pollution to the environment
higher processing costs

Method used

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  • Method for treating waste mobile phone circuit board and recovering precious metals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for processing waste mobile phone circuit boards and recycling precious metals, the method is:

[0034] (1) After crushing 1kg of waste mobile phone circuit boards, incinerate at 600°C for 30 minutes, and collect the residue after incineration;

[0035] (2) Wash the residue after incineration with water, wash off the light substances (plastics, etc.) in the residue after incineration, and collect the residue after washing;

[0036] (3) Soak the washed residue in an excess of 20% H 2 SO 4 solution, after stirring for 12min, filter, and the filtrate is concentrated to produce CuSO 4 products, collected separately;

[0037] (4) Wash the filtered residue with water to remove residual H 2 SO 4 ;

[0038] (5) Soak the residue after washing in step (4) in 0.5mol / L HNO 3 Solution, after stirring for 30min, filter, collect filtrate and filter residue respectively;

[0039] (6) Continuously feed O into the filtrate collected in step (5) 3 Carry out the oxidation...

Embodiment 2

[0045] A method for processing waste mobile phone circuit boards and recycling precious metals, the method is:

[0046] (1) After crushing 1kg of waste mobile phone circuit boards, incinerate at 600°C for 30 minutes, and collect the residue after incineration;

[0047] (2) Wash the residue after incineration with water, wash off the light substances (plastics, etc.) in the residue after incineration, and collect the residue after washing;

[0048] (3) Soak the washed residue in an excess of 10% H 2 SO 4 solution, after stirring for 10min, filter, and the filtrate is concentrated to produce CuSO4 products, collected separately;

[0049] (4) Wash the filtered residue with water to remove residual H 2 SO 4 ;

[0050] (5) Soak the residue after washing in step (4) in 0.5mol / L HNO 3 Solution, after stirring for 30min, filter, collect filtrate and filter residue respectively;

[0051] (6) Continuously feed O into the filtrate collected in step (5) 3 Carry out the oxidation r...

Embodiment 3

[0057] A method for processing waste mobile phone circuit boards and recycling precious metals, the method is:

[0058] (1) After crushing 1kg of waste mobile phone circuit boards, incinerate at 600°C for 30 minutes, and collect the residue after incineration;

[0059] (2) Wash the residue after incineration with water, wash off the light substances (plastics, etc.) in the residue after incineration, and collect the residue after washing;

[0060] (3) Soak the washed residue in an excess of 20% H 2 SO 4 solution, after stirring for 10min, filter, and the filtrate is concentrated to produce CuSO 4 products, collected separately;

[0061] (4) Wash the filtered residue with water to remove residual H 2 SO 4 ;

[0062] (5) Soak the residue after washing in step (4) in 0.5mol / L HNO 3 Solution, after stirring for 30min, filter, collect filtrate and filter residue respectively;

[0063] (6) Continuously feed O into the filtrate collected in step (5) 3 Carry out the oxidation...

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Abstract

The invention relates to a method for treating a waste mobile phone circuit board and recovering precious metals. The method comprises: crushing and burning a waste mobile phone circuit board; washing residue with water after burning; soaking the washed residue in sulfuric acid, stirring, and concentrating the filtrate to produce a copper sulfate product; washing the filter residue with water to remove the residual sulfuric acid; adding nitric acid to the washed residue, stirring, and filtering; respectively treating the filtrate and the filter residue, wherein O3 is introduced into the filtrate to carry out an oxidation reaction and then filtration is performed, the filter residue is a palladium oxide product, and the filtrate is concentrated to produce a silver nitrate product; heating the filter residue, and dissolving in aqua regia to carry out a reaction; adding sodium hydroxide or potassium hydroxide to adjust the pH value to 10-12, filtering, and uniformly heating the filter residue for 30-40 min at a temperature of 140-150 DEG C; and adjusting the temperature to 250-300 DEG C, and uniformly heating for 20-30 min to produce a gold product. According to the invention, the waste mobile phone circuit board is subjected to the harmless treatment and the precious metals in the waste mobile phone circuit board are recovered, such that the waste mobile phone circuit board pollution problem is solved, and the waste of valuable resources is avoided.

Description

technical field [0001] The invention belongs to the field of electronic product waste treatment, in particular to a treatment method for mobile phone circuit boards. Background technique [0002] At present, there are mainly the following methods for processing circuit boards: [0003] A. Physical recovery process of metal-enriched bodies in waste circuit boards [0004] The whole process adopts the method of machine reduction and physical separation, and finally separates the metal-enriched body and non-metal-enriched body of various components. It is impossible to collect various precious metals separately and directly achieve the effect of purification. [0005] B. A method of extracting gold from waste circuit boards [0006] Secondary acid leaching is used to pretreat the metal particles of waste circuit boards. The primary leaching uses a mixed acid solution of nitric acid and sulfuric acid to leach the copper-based base metals wrapped in gold in waste circuit boards...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B11/00C22B15/00
CPCY02P10/20
Inventor 华庆亮武伟男高麒麟刘晶蔡钊荣马振彦肖朋姚晓琳刘佳丽王梦
Owner DALIAN DONGTAI INDAL WASTE TREATMENT
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