CN102923702A - Method for preparing active carbon from waste printed circuit board - Google Patents
Method for preparing active carbon from waste printed circuit board Download PDFInfo
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- CN102923702A CN102923702A CN2012103800851A CN201210380085A CN102923702A CN 102923702 A CN102923702 A CN 102923702A CN 2012103800851 A CN2012103800851 A CN 2012103800851A CN 201210380085 A CN201210380085 A CN 201210380085A CN 102923702 A CN102923702 A CN 102923702A
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- activation
- printed circuit
- circuit board
- waste
- charcoal
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/82—Recycling of waste of electrical or electronic equipment [WEEE]
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- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a method for preparing active carbon from a waste printed circuit board. According to the method, the active carbon with high adsorptive property is prepared by taking a nonmetal part in the waste printed circuit board from which metal is removed as a raw material and KOH or NaOH or K2CO3 or Na2CO3 and the like as an active agent in a one-step carbon activation method or step-by-step carbon-activation method. By the method, the adsorptive properties of the products can meet the requirement of the performance of the active carbon sold on the market, and the performance of part of products exceeds the national first-grade standard.
Description
Technical field
The present invention relates to a kind of method of utilizing waste and old printed circuit board to prepare gac, belong to secondary resource recovery and utilization technology field.
Background technology
Printed circuit board (PCB) is widely used in electronic enterprises, is one of key part of all kinds of electronic apparatuss, especially is widely used in the electronic products such as computer, TV.In the production process of circuit card, can produce a large amount of defect ware and scrap stock on the one hand; it was disassembled in the process and also will produce a large amount of waste and old printed circuit boards again after all kinds of electric equipment productss were scrapped in addition; waste and old printed circuit board class solid waste is carried out recycling effectively; will be for waste electrical equipment process for producing unit bring certain economic benefit, society and the ecological benefits of the aspects such as environment, protection of the environment that economize on resources in addition simultaneously.
At present, mainly take the method for landfill to process for the discarded printed circuit boards goods.Landfill method need not pre-treatment, cost is lower, but resin is stayed for a long time and is difficult in the soil decomposing, objectionable impurities in the plastics easily causes secondary pollution, landfill method not only pollutes soil reclamation, and wasted a large amount of recyclable resources, and both can reduce the environmental problem that goes from bad to worse so rationally recycle waste and old printed circuit board, also be the Important Action of alleviating the resource scarcity problem.
Can make gac take waste and old printed circuit board as raw material, and have good absorption property, applied range has reduced the waste of resource, turns waste into wealth when producing economic benefit, has reached the purpose of protection of the environment.
Summary of the invention
Purpose of the present invention and the technical problem that mainly solves be, takes full advantage of the waste and old printed circuit board non-metallic part of removing after the metal part, with a kind of simple method, prepares the gac with good absorption property.
The present invention is a kind of method for preparing gac with waste and old printed circuit board, it is characterized in that having following process steps:
A. the sorting of waste and old printed circuit board: after the waste and old printed circuit board pulverizing, adopt the method for electric separation or gravity separation that metal and non-metallic part are separated;
B. remove the pyrocarbon activation of the waste and old printed circuit board powder of metal, its process has two approach: i.e. a step charcoal activation method or step by step charcoal-activation method;
(1). step charcoal activation: control waste and old printed circuit board powder and activator mass ratio 1: 1～1: 4.5, after ground and mixed is even, with its activation furnace of packing into, at 650 ℃～950 ℃, N
2Protection or CO
2The lower charcoal activation of protection 0.5～2 hour is cooled to room temperature;
Above-mentioned activator is: KOH or NaOH or K
2CO
3Or Na
2CO
3
(2). substep charcoal-activation: with the waste and old printed circuit board powder charring furnace of packing into, 350～500 ℃ of lower charings 0.5～1 hour, after being cooled to room temperature, control waste and old printed circuit board powder and activator mass ratio 1: 1～1: 4.5, after ground and mixed is even, with its activation furnace of packing into, at 600 ℃～950 ℃, N
2Protection or CO
2The lower charcoal activation of protection 0.5～2 hour is cooled to room temperature;
Above-mentioned activator is: K
2CO
3Or Na
2CO
3
C. purifying treatment: the activation products hot wash several times that step b-(1) or step b-(2) are prepared, be washed till neutrality, then filtering separation is put into baking oven with solid materials and is dried, the control bake out temperature is 105 ℃, namely makes gac; The washing lotion that produces in the process can be through pervaporation, dried recovered activator, and the activator of recovery is reusable.
The present invention compared with prior art has significant characteristic and progress, is described below:
1. for waste and old printed circuit board, adopt the method for electric separation or gravity separation only to remove the metal part, only pulverize for resin and glass fibre and not separate, be that the resin that glass fibre strengthens does not need resin is separated with glass fibre, directly carry out a step charcoal priming reaction or substep charcoal-priming reaction, the charcoal absorption of preparing is good, the glass fibre that contains has increased the physical strength of material, glass fibre and alkaline activation agent reaction in the reactivation process is to the raising generation positive influence of product specific surface area.
2. the pyrocarbon reactivation process of gac can be divided into two approach and carries out, i.e. a step charcoal activation method and substep charcoal-activation method.The used activator of one step charcoal activation is KOH or NaOH or K
2CO
3Or Na
2CO
3, the used activator of substep charcoal-activation is K
2CO
3Or Na
2CO
3
The present invention adopts chemical activation method to be prepared into gac waste and old printed circuit board, the absorption property of product can satisfy commercially available Properties of Activated Carbon requirement, the performance of portioned product surpasses country-level product standard, the proposition of this invention will promote the propagation and employment of waste and old printed circuit board New Process for Treatment, all will produce good positive effect to comprehensive utilization and the environmental protection treatment of whole waste and old electric electrical equipment.The property of the present invention is directed to is strong, and the quasi-solution problem of determining is clear and definite, has higher economy, environment and social synthesis's benefit.
Embodiment
The present invention is described in more detail below in conjunction with specific embodiment.
Embodiment 1
Waste and old printed circuit board powder behind the separating metal is as raw material, carry out substep charcoal-activation, namely behind 400 ℃ of lower charing 75min, carbonizing production mixes, grinds evenly with 1: 4.5 mass ratio with activator NaOH, then this mixture is placed activation furnace to activate 600 ℃ of lower heating, and soak time is 110min, after sample is cooled to room temperature, to neutral, product is in 105 ℃ of lower dryings, activated carbon product namely with hot wash.The methylene blue adsorption value of this product is 240mg/g.
Embodiment 2
Waste and old printed circuit board powder behind the separating metal is as raw material, carry out substep charcoal-activation, namely behind 400 ℃ of lower charing 105min, carbonizing production mixes, grinds evenly with 1: 3.5 mass ratio with activator NaOH, then this mixture is placed activation furnace to activate 800 ℃ of lower heating, and soak time is 30min, after sample is cooled to room temperature, to neutral, product is in 105 ℃ of lower dryings, activated carbon product namely with hot wash.The methylene blue adsorption value of this product is 240mg/g.
Embodiment 3
Waste and old printed circuit board powder behind the separating metal is as raw material, carry out substep charcoal-activation, namely behind 500 ℃ of lower charing 90min, carbonizing production mixes, grinds evenly with 1: 3 mass ratio with activator KOH, then this mixture is placed activation furnace to activate 600 ℃ of lower heating, and soak time is 90min, after sample is cooled to room temperature, to neutral, product is in 105 ℃ of lower dryings, activated carbon product namely with hot wash.The methylene blue adsorption value of this product is 230mg/g.
Embodiment 4
Waste and old printed circuit board powder behind the separating metal is as raw material, carry out step charcoal activation, be that raw material mixes, grinds evenly with 1: 3 mass ratio with activator KOH, then this mixture is placed activation furnace to carry out the charcoal activation 700 ℃ of lower heating, the charcoal soak time is 55min, and is after sample is cooled to room temperature, extremely neutral with hot wash, product is in 105 ℃ of lower dryings, activated carbon product namely.The methylene blue adsorption value of this product is 142.4mg/g.
Embodiment 5
Waste and old printed circuit board powder behind the separating metal carries out step charcoal activation, i.e. raw material and activator K as raw material
2CO
3Mass ratio with 1: 3 mixes, grinds evenly, then this mixture is placed activation furnace to carry out the charcoal activation 850 ℃ of lower heating, and the charcoal soak time is 1h, after sample is cooled to room temperature, to neutral, product is in 105 ℃ of lower dryings, activated carbon product namely with hot wash.The methylene blue adsorption value of this product is 142.4mg/g.
Embodiment 6
Waste and old printed circuit board powder behind the separating metal carries out step charcoal activation, i.e. raw material and activator K as raw material
2CO
3Mass ratio with 1: 3 mixes, grinds evenly, then this mixture is placed activation furnace to carry out the charcoal activation 950 ℃ of lower heating, and the charcoal soak time is 1h, after sample is cooled to room temperature, to neutral, product is in 105 ℃ of lower dryings, activated carbon product namely with hot wash.The methylene blue adsorption value of this product is 120mg/g.
Embodiment 7
Waste and old printed circuit board powder behind the separating metal carries out step charcoal activation, i.e. raw material and activator Na as raw material
2CO
3Mass ratio with 1: 3 mixes, grinds evenly, then this mixture is placed activation furnace to carry out the charcoal activation 850 ℃ of lower heating, and the charcoal soak time is 1h, after sample is cooled to room temperature, to neutral, product is in 105 ℃ of lower dryings, activated carbon product namely with hot wash.The methylene blue adsorption value of this product is 135mg/g.
Claims (1)
1. method for preparing gac with waste and old printed circuit board is characterized in that having following process and step:
A. the sorting of waste and old printed circuit board: after the waste and old printed circuit board pulverizing, adopt the method for electric separation or gravity separation that metal and non-metallic part are separated;
B. remove the pyrocarbon activation of the waste and old printed circuit board powder of metal, its process has two approach: i.e. a step charcoal activation method or step by step charcoal-activation method;
(1). step charcoal activation: control waste and old printed circuit board powder and activator mass ratio 1: 1～1: 4.5, after ground and mixed is even, with its activation furnace of packing into, at 650 ℃～950 ℃, N
2Protection or CO
2The lower charcoal activation of protection 0.5～2 hour is cooled to room temperature;
Above-mentioned activator is: KOH or NaOH or K
2CO
3Or Na
2CO
3
(2). substep charcoal-activation: with the waste and old printed circuit board powder charring furnace of packing into, 350～500 ℃ of lower charings 0.5～1 hour, after being cooled to room temperature, control waste and old printed circuit board powder and activator mass ratio 1: 1～1: 4.5, after ground and mixed is even, with its activation furnace of packing into, at 600 ℃～950 ℃, N
2Protection or CO
2The lower charcoal activation of protection 0.5～2 hour is cooled to room temperature;
Above-mentioned activator is: K
2CO
3Or Na
2CO
3
C. purifying treatment: the activation products hot wash several times with step b-(1) or step b-(2) prepare, be washed till neutrality, then filtering separation is put into baking oven with solid materials and is dried, and the control bake out temperature is 105 ℃, namely makes gac; The washing lotion that produces in the process can be through pervaporation, dried recovered activator, and the activator of recovery is reusable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103800851A CN102923702A (en) | 2012-10-10 | 2012-10-10 | Method for preparing active carbon from waste printed circuit board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012103800851A CN102923702A (en) | 2012-10-10 | 2012-10-10 | Method for preparing active carbon from waste printed circuit board |
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| Publication Number | Publication Date |
|---|---|
| CN102923702A true CN102923702A (en) | 2013-02-13 |
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|---|---|---|---|
| CN2012103800851A Pending CN102923702A (en) | 2012-10-10 | 2012-10-10 | Method for preparing active carbon from waste printed circuit board |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103754869A (en) * | 2014-01-02 | 2014-04-30 | 上海大学 | Method for preparing high-quality active carbon by adopting waste polyurethane foamed plastic |
| CN106564897A (en) * | 2015-10-08 | 2017-04-19 | 中国科学院过程工程研究所 | Method for preparing porous active carbon by using waste PCB |
| CN109825706A (en) * | 2019-01-09 | 2019-05-31 | 郑州大学 | A kind of waste and old circuit board recoverying and utilizing method |
| CN114249319A (en) * | 2021-12-15 | 2022-03-29 | 安徽农业大学 | Preparation method of waste circuit board active carbon for Congo red adsorption |
Citations (7)
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|---|---|---|---|---|
| JP2004174499A (en) * | 2003-12-26 | 2004-06-24 | Japan Enviro Chemicals Ltd | Granulated active carbon for removing pcb |
| JP2007119342A (en) * | 2005-09-29 | 2007-05-17 | Showa Denko Kk | Activated carbon and its manufacturing method and use |
| CN101028925A (en) * | 2006-03-03 | 2007-09-05 | 中国人民解放军63971部队 | Process for preparing super activated carbon |
| CN101428797A (en) * | 2008-12-01 | 2009-05-13 | 陕西师范大学 | Method for producing super absorbent charcoal with waste printed circuit board as raw material |
| CN101804988A (en) * | 2010-05-05 | 2010-08-18 | 吉林大学 | Novel method for preparing silicon dioxide and active carbon from rice hull ash |
| TW201033120A (en) * | 2009-03-10 | 2010-09-16 | Yu-Chun Chiang | Method of producing activated carbon from printed circuit board |
| CN101948110A (en) * | 2010-10-12 | 2011-01-19 | 昆明理工大学 | Method for preparing activated carbons by using plastics of recycled waste circuit boards as raw material |
-
2012
- 2012-10-10 CN CN2012103800851A patent/CN102923702A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004174499A (en) * | 2003-12-26 | 2004-06-24 | Japan Enviro Chemicals Ltd | Granulated active carbon for removing pcb |
| JP2007119342A (en) * | 2005-09-29 | 2007-05-17 | Showa Denko Kk | Activated carbon and its manufacturing method and use |
| CN101028925A (en) * | 2006-03-03 | 2007-09-05 | 中国人民解放军63971部队 | Process for preparing super activated carbon |
| CN101428797A (en) * | 2008-12-01 | 2009-05-13 | 陕西师范大学 | Method for producing super absorbent charcoal with waste printed circuit board as raw material |
| TW201033120A (en) * | 2009-03-10 | 2010-09-16 | Yu-Chun Chiang | Method of producing activated carbon from printed circuit board |
| CN101804988A (en) * | 2010-05-05 | 2010-08-18 | 吉林大学 | Novel method for preparing silicon dioxide and active carbon from rice hull ash |
| CN101948110A (en) * | 2010-10-12 | 2011-01-19 | 昆明理工大学 | Method for preparing activated carbons by using plastics of recycled waste circuit boards as raw material |
Non-Patent Citations (1)
| Title |
|---|
| 南京林业工业学院: "《林产化学工业手册 下册》", 30 August 1981, article "四、化学药剂活化法生产活性炭", pages: 1307-1308 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103754869A (en) * | 2014-01-02 | 2014-04-30 | 上海大学 | Method for preparing high-quality active carbon by adopting waste polyurethane foamed plastic |
| CN106564897A (en) * | 2015-10-08 | 2017-04-19 | 中国科学院过程工程研究所 | Method for preparing porous active carbon by using waste PCB |
| CN109825706A (en) * | 2019-01-09 | 2019-05-31 | 郑州大学 | A kind of waste and old circuit board recoverying and utilizing method |
| CN114249319A (en) * | 2021-12-15 | 2022-03-29 | 安徽农业大学 | Preparation method of waste circuit board active carbon for Congo red adsorption |
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Application publication date: 20130213 |