CN1947847A

CN1947847A - Method for recovering metals resources from waste electronic circuit board

Info

Publication number: CN1947847A
Application number: CNA2006100971400A
Authority: CN
Inventors: 江博新; 薛红伟
Original assignee: Individual
Current assignee: Individual
Priority date: 2006-10-26
Filing date: 2006-10-26
Publication date: 2007-04-18

Abstract

A method for recovering metal from used or rejected electronic circuit boards includes such steps as detaching electronic elements from circuit boards, feeding it along with cooling water in breaking machine, breaking to obtain particles, loading them on shaker using water as medium, and gravitational separation of metallic particles from non-metal particles.

Description

A kind of method that from waste electron wiring board, reclaims metals resources

Affiliated technical field

The present invention relates to a kind of method that reclaims metals resources, particularly a kind of method that from waste electron wiring board, reclaims metals resources.

Background technology

At present, along with rolling up of each electronic product, the recycling problem of a large amount of waste electron wiring boards is just receiving the concern of each side.And electronic circuit board is as the core component of electronic product, because of the needs of making and relate to often cause the material composition very complicated, corresponding recovery difficult is very big, corresponding specialized department also reclaims and sharp problem of getting rid of the waste electronic wiring board with regard to being difficult to solve, so just cause the waste of resource and the pollution and the destruction of environment, also do not had good solution to occur at present.

At present, the recycling waste electron wiring board mainly contains three kinds of methods:

First method is a burning disposal, incinerate combustible components such as plastics in the wiring board, resin, paint after, obtain to contain the residue body of metal.This method can produce a large amount of pernicious gases, and also can pollute and valuable metals resources is formed serious scaling loss environment wastes.

Second method is acid bubble corrosion recycling, promptly acid is molten in the strong oxidized water medium, leach the metal ingredient in the electronic circuit, thereby realize reclaiming the purpose of metal, there are problems such as treatment effeciency is low, cost is high, the tail washings waste water of subsequent treatment is many in this method, and the environmental pollution of waste water is difficult to control.

The third method is to adopt the physical method recycling, is about to wiring board by mechanical crushing, adopts the sorting of ore-dressing technique technology after separating metal and the nonmetallic materials in the wiring board, obtains metal, nonmetal, thereby realizes the method for recovery metals resources.Physical method recovery train plate is because of having the features of smaller that influences to environment, thereby is subject to people's attention just day by day.As the patent No. be: 021214344; 9910286227; 981055923 patent all relates to the method for physical method recovery train plate.Make in the physical method recovery train plate process that technological process is shorter, processing cost is lower but also need further to research and develop, it is higher to reclaim benefit, and the littler new process of environmental pollution.

Summary of the invention

The objective of the invention is deficiency at existing process existence, a kind of method that reclaims metals resources from waste electron wiring board has been proposed, this method not only technology is simple, reasonable, cost is low, resource recycling rate high benefit is good, and three-waste free discharge, the recycling and environmental friendliness of realization water resource.

The present invention realizes from following technical scheme; A kind of from waste electron wiring board the method for metal, its technological process is as follows:

(1). after waste electron wiring board removed electronic devices and components, drop into and inject cooling water in the pulverizer and be processed into powder or particle;

(2). it is on the gravity separation shaking table of medium that the powder particle of gained is put into water, sub-elects metal in powder or the particle and nonmetal, thereby realizes the recovery to metals resources.

Wherein wiring board is meant that the external dimensions of wiring board should be by meeting the reinforced requirement of coarse crushing equipment after shearing through removing the tabula rasa and the copperclad plate of electronic devices and components.

Coarse crushing: be meant that adopting the patent No. is 022470158 special-purpose disintegrating machine, discharging sieve plate hole is that the special plane equipment of diameter 2mm carries out; The material that above coarse crushing produces is done meticulousr pulverizing processing, pour into cooling water in the fine crushing process in the equipment working chamber continuously.

Fine crushing: be meant the discharging sieve plate that adopts in the above-mentioned same patent No., bore dia is that the special-purpose disintegrating machine of 2mm carries out, and to the material that above coarse crushing produces, does meticulousr pulverizing processing, also injects cooling water in the fine crushing process in the equipment working chamber.

Separation by shaking table: be meant the fine grained slurry of resulting size behind the fine crushing less than 2mm, joining in the 6-S type shaking table, is that medium carries out gravity separation with water, separates metal and nonmetallic process, whole separation by shaking table process is operated routinely, the separating effect that can realize ideal.

Its good effect is: utilize said method recycling electronic circuit board, can realize metal recovery utilization rate 〉=98%, the purity of metal 〉=95%, resulting particulate and metalliferous material, both can directly produce corresponding chemical products or the higher metal of purity with the method for hydrometallurgy, also the particulate of sorting gained and metalliferous material can be handed over the copper smelting enterprise further purification processes of working after dehydrating, from the earth of positive pole, be extracted and reclaim all metals resources.Utilize the method for above-mentioned recycling electronic circuit board, not only technological process is brief, and is easy to operate, and investment of production equipment can significantly reduce, and can realize that production environment do not have the close friend of dust, free from extraneous odour, no discharging, cycling use of water and environment.

Specific embodiment

Below in conjunction with embodiment the present invention is described in further detail:

Embodiment 1: select the waste and old television set wiring board that removes electronic devices and components of some for use, according to the following steps the metals resources in the recovery train plate:

(1). with cutter wiring board is cut into the en plaque that the length of side is not more than 25cm, drop into sieve diameter and be and carry out fragmentation in the special-purpose coarse crushing machine of 2cm and process, obtain the coarse granule slurry of size below 2cm.

(2). the coarse granule slurry is sent in the special-purpose fine crushing machine that sieve diameter is 2mm carried out degree of depth retrofit again, obtain size at the following fine grained slurry of 2mm;

(3). fine grained slurry grain slurry is added in the conventional shaking table of 6～S type, and water is that medium carries out gravity separation, separablely goes out metal in the wiring board and nonmetal.

(4). in thick, the fine crushing operating process because of having poured into cooling water; eliminate conventional dry type effectively and pulverized problems such as the dust that produces in the wiring board, smell; and by the allotment water consumption; realize the recycling fully of pulverizing and follow-up separation link water; save water resource, and protected environment.

Through check, with the metal in the said method recovery television set wiring board, the rate of recovery is 99%, and the purity of metal reaches 96.5%; The metal that reclaims gained both can adopt wet processing to do further to purify or deep processing, also can give copper smelting plant and be used as the very high blister copper raw material of purity, did further to purify, and reached the purpose of comprehensive recovery metals resources.The nonmetal resource that adopts said method to reclaim gained both can have been mixed and done in the concrete to solidify to handle, and also can produce the nonmetallic composite product.

Claims

1. method that from waste electron wiring board, reclaims metals resources, it is characterized in that: this method is carried out as follows successively:

(1). after waste electron wiring board removed electronic devices and components, drop into and inject cold true water in the pulverizer and be processed into powder or particle; (2). it is on the gravity separation shaking table of medium that the powder of gained or particle are put into water, sub-elects metal in powder or the particle and nonmetal, thereby realizes the recovery to metals resources.

2. a kind of method that from waste electron wiring board, reclaims metals resources according to claim 1, it is characterized in that: employing be the special-purpose disintegrating machine of the patent No. 022470158, through the pulverizing of thick, thin two stage crusher, the powder size of pulverizing gained is below the 2mm.

3. a kind of method that reclaims metals resources from waste electron wiring board according to claim 1, it is characterized in that: old circuit board pours into cooling water in the pulverizer working chamber after being admitted to pulverizer, and the cooling water that adds can recycle.

4. a kind of method that reclaims metals resources from waste electron wiring board according to claim 1, it is characterized in that: adopting with water is separating medium, and model is the shaking table of 6～S type.