CN101954678B - Process for preprocessing waste printed circuit board before separation - Google Patents
Process for preprocessing waste printed circuit board before separation Download PDFInfo
- Publication number
- CN101954678B CN101954678B CN2010105250043A CN201010525004A CN101954678B CN 101954678 B CN101954678 B CN 101954678B CN 2010105250043 A CN2010105250043 A CN 2010105250043A CN 201010525004 A CN201010525004 A CN 201010525004A CN 101954678 B CN101954678 B CN 101954678B
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- China
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- printed circuit
- circuit board
- circuit boards
- ore
- waste printed
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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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
- Y02W30/62—Plastics recycling; Rubber recycling
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- Processing Of Solid Wastes (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a process for preprocessing a waste printed circuit board before separation, which comprises the following steps of: a, crushing the waste printed circuit board, adding a surfactant and performing ore-grinding for 5 to 15min in a way of controlling ore-grinding concentration to be 25 to 35 percent, wherein the addition of the surfactant is 1 to 3 kg/t; b, taking the waste printed circuit board subjected to the ore-grinding out, adding a regulating agent into the waste printed circuit board and uniformly stirring the mixture, wherein the using amount of the regulating agent is 400 to 800 g/t; and c, heating ore pulp to 55 to 65 DEG C, forcibly and uniformly stirring the ore pulp for 25 to 35min and separating waste plastics and metals. The process for preprocessing the waste printed circuit board before the separation has the characteristics of simple process flow, good effect, no pollution and the like, relatively better realizes the separation of the hydrophobic plastics and the metals and achieves the recovery rate of the separated metals of over 75 percent.
Description
Technical field
The present invention relates to the preceding pretreating process of a kind of discarded printed circuit boards sorting; Be meant the method that adds the surfactant ore grinding and accompany by the high temperature strong mixing that adopts especially; Discarded printed circuit boards is carried out the pretreating process before the sorting, relate to the separating treatment of electron solid discarded object.
Background technology
Current society; Along with the application of plastics is increasingly extensive; The tremendous growth of plastics consumption figure, whole world plastics total output has surpassed 100,000,000 t at present, and meanwhile; The environmental pollution that waste plastic causes has become one of global environmental problem, and the recovery problem of waste plastic has caused the great attention of countries in the world governments.Landfill is the processing method that people use always with burning; But landfill can cause to plough and reduce and underground water pollution; Burning to increase content of harmful in the atmosphere, and these two kinds of methods all can cause the serious waste of resource, harmonious incompatible with present society.In recent years, people have developed regeneration, the thermal decomposition of waste plastic and have reclaimed low molecular compound and burn the new technology that reclaims resource reutilizations such as heat energy through constantly research, have significantly reduced the pollution to environment.
Printed circuit board (PCB) (PCB) is the important component part of electronic product; And along with the information age high speed development; The speed of the update of electronic equipment is also constantly accelerated, and has thereupon produced a large amount of electron wastes, and the quantity of discarded printed circuit boards also increases just year by year.The recovery of discarded printed circuit boards is a suitable complicated problems, because its material is formed and combination is complicated, liberation degree of minerals is little, is not easy very much to realize separating.Wherein a large amount of more metals, like copper, iron, aluminium and noble metal that some are micro-etc., but not metal ingredient then mainly is the hot solid plastic that contains special additive, the two separates the comparison difficulty.
In the past, the recovery technology of discarded printed circuit boards mainly focused on the recovery of metal, but the basic development direction of recovery technology is to realize the full Reuse of materials of non-ferrous metal, noble metal and organic substance now.The most frequently used recovery now mainly is the method that adopts dry process, at first need discarded printed circuit boards dismantled, pulverize, and carries out the material sorting then.The thicker part of granularity can reclaim through the physical separation technology; After but some plastics and metal pulverizing are meticulous; Specific surface energy increases, because the two surface hydrophobic is all stronger, causes the two to adhere to each other, wrap up; Conventional processing method is difficult to prove effective, and the metal separation rate of recovery is lower.So, the preprocess method before the sorting just seems very important.
Summary of the invention
Technical problem to be solved by this invention provides a kind of preceding pretreating process of discarded printed circuit boards sorting that metal and plastics are effectively dissociated.
In order to solve the problems of the technologies described above; Pretreating process before the discarded printed circuit boards sorting that the present invention adopts; The steps include: a, discarded printed circuit boards is pulverized back adding surfactant ore grinding 5～15min; Ore milling concentration is controlled at 25～35%, and the surfactant addition is 1-3kg/t, and itself and discarded printed circuit boards are fully reacted; B, the discarded printed circuit boards behind the ore grinding taken out after, add the adjustment agent at discarded printed circuit boards, adjustment agent consumption is 400-800g/t, and stirs; C, ore pulp is heated to 55～65 degrees centigrade, strong mixing 25～35min evenly after, carry out separating of waste plastic and metal.
Described surfactant is a sodium humate.
Described adjustment agent is a sodium carbonate.
The rotating speed of described strong mixing is 1800～2200r/min.
Adopt the preceding pretreating process of discarded printed circuit boards sorting provided by the invention; During to discarded printed circuit boards separating plastic and metal; Because thinner plastics and the metal of granularity adheres to each other, wraps up; The problem of separation difficulty proposes adding the processing method of surfactant ore grinding and high temperature strong mixing, and discarded printed circuit boards is carried out the preliminary treatment before the sorting.Mainly be to utilize the adding surfactant to carry out ore grinding; And add adjustment agent sodium carbonate, through the high temperature strong mixing, in order to change the physicochemical properties of metal surface; Itself and plastics are dissociated; For follow-up sorting provides advantageous conditions, realized separating of hydrophobic plastic and metal preferably, the rate of recovery of separating metal can reach more than 75%.
In sum; Pretreatment process method before the discarded printed circuit boards sorting provided by the invention; Metal and plastics are effectively dissociated,, and have characteristics such as technological process is simple, effective, pollution-free for follow-up physical separation provides advantage.
Description of drawings
Fig. 1 is a process flow diagram of the present invention.
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is described further.
Pretreating process before the discarded printed circuit boards sorting; The steps include: a, discarded printed circuit boards is pulverized back adding sodium humate ore grinding 5～15min; Ore milling concentration is controlled at 25～35%, and the sodium humate addition is 1-3kg/t, and itself and discarded printed circuit boards are fully reacted; B, the discarded printed circuit boards behind the ore grinding taken out after, add sodium carbonate at discarded printed circuit boards, sodium carbonate amount is 400-800g/t, and stirs; C, ore pulp is heated to 55～65 degrees centigrade, the strong mixing 25～35min that carries out rotating speed and be 1800～2200r/min evenly after, carry out separating of waste plastic and metal.
Embodiment 1:
Adopt method of the present invention, the Guangxi discarded printed circuit boards is tested, this electron solid discarded object is a mine tailing of pulverizing the back pneumatic separating, because plastics and metal wrap up each other, pneumatic separating is difficult to work.Major metal and content are: copper 9.8%, and iron 5.4%, aluminium 1.1%, noble metal have bismuth 0.9% etc., and main plastic components is PCB.Ore milling concentration is controlled at 30%, adds sodium humate 2kg/t, ore grinding 10min; The material that mill is good is poured in the agitator; Add adjustment agent sodium carbonate 600g/t, and heat carry out strong mixing (rotating speed 2000r/min) 30min to 60 ℃ after, carry out sorting; Can obtain separating effect preferably, it is following specifically to separate index:
Separating resulting after the discarded printed circuit boards preliminary treatment of table one Guangxi
| Product | Productive rate/% | Cu grade/% | Fe grade/% | The Cu rate of recovery/% | The Fe rate of recovery/% |
| Metal | 13.2 | 55.6 | 33.6 | 74.9 | 82.1 |
| Plastics | 87.7 | 2.8 | 1.1 | 25.1 | 17.9 |
| Raw ore | 9.8 | 5.4 | 100 | 100 |
Claims (1)
1. the pretreating process before the discarded printed circuit boards sorting; It is characterized in that: the steps include: a, discarded printed circuit boards is pulverized back adding surfactant ore grinding 5～15min; Ore milling concentration is controlled at 25～35%; The surfactant addition is 1-3kg/t, and described surfactant is a sodium humate; B, the discarded printed circuit boards behind the ore grinding taken out after, add the adjustment agent at discarded printed circuit boards, described adjustment agent is a sodium carbonate, adjustment agent consumption is 400-800g/t, and stirs; C, ore pulp is heated to 55～65 degrees centigrade, strong mixing 25～35min evenly after, carry out separating of waste plastic and metal, the rotating speed of described strong mixing is 1800～2200r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105250043A CN101954678B (en) | 2010-10-28 | 2010-10-28 | Process for preprocessing waste printed circuit board before separation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105250043A CN101954678B (en) | 2010-10-28 | 2010-10-28 | Process for preprocessing waste printed circuit board before separation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101954678A CN101954678A (en) | 2011-01-26 |
| CN101954678B true CN101954678B (en) | 2012-07-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105250043A Expired - Fee Related CN101954678B (en) | 2010-10-28 | 2010-10-28 | Process for preprocessing waste printed circuit board before separation |
Country Status (1)
| Country | Link |
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| CN (1) | CN101954678B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003051545A1 (en) * | 2001-12-18 | 2003-06-26 | Denso Corporation | Printed circuit board recycle method and apparatus thereof |
| CN101007313A (en) * | 2006-01-20 | 2007-08-01 | 巫协森 | Recovery method of discarded printed circuit boards |
| CN101423898A (en) * | 2008-12-03 | 2009-05-06 | 中南大学 | Recovery method of waste circuit board |
| CN101591459A (en) * | 2009-07-02 | 2009-12-02 | 上海交通大学 | Utilize discarded printed circuit boards to prepare the method for wood plastic composite |
-
2010
- 2010-10-28 CN CN2010105250043A patent/CN101954678B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2003051545A1 (en) * | 2001-12-18 | 2003-06-26 | Denso Corporation | Printed circuit board recycle method and apparatus thereof |
| CN101007313A (en) * | 2006-01-20 | 2007-08-01 | 巫协森 | Recovery method of discarded printed circuit boards |
| CN101423898A (en) * | 2008-12-03 | 2009-05-06 | 中南大学 | Recovery method of waste circuit board |
| CN101591459A (en) * | 2009-07-02 | 2009-12-02 | 上海交通大学 | Utilize discarded printed circuit boards to prepare the method for wood plastic composite |
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| Publication number | Publication date |
|---|---|
| CN101954678A (en) | 2011-01-26 |
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Granted publication date: 20120725 Termination date: 20121028 |