CN1760386A - Vacuum distillation method for separating cadmium element from mixed metals in worn-out printing circuit board - Google Patents
Vacuum distillation method for separating cadmium element from mixed metals in worn-out printing circuit board Download PDFInfo
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- CN1760386A CN1760386A CNA2005100309872A CN200510030987A CN1760386A CN 1760386 A CN1760386 A CN 1760386A CN A2005100309872 A CNA2005100309872 A CN A2005100309872A CN 200510030987 A CN200510030987 A CN 200510030987A CN 1760386 A CN1760386 A CN 1760386A
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- cadmium
- vacuum distillation
- circuit board
- crucible
- waste
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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
Abstract
A process for separating the Cd from the metallic mixture generated by breaking the used or rejected PCBs by vacuum distillation method includes such steps as heating in vacuum furnace, evaporating Cd at 400-490 deg.C and condensing the Cd vapor at 320-350 deg.C. Its advantages are low cost, high effect and no pollution.
Description
Technical field
The present invention relates to the vacuum distillation method for separating of cadmium element in a kind of waste and old printed circuit board hybrid metal, be to waste and old printed circuit board reclaim, a kind of method of regeneration and resource utilization.Belong to trade waste processing, resource utilization field in the environmental protection technical field.
Background technology
Novel solid waste-electron wastes appears in the high speed development along with electronic information industry: comprise electronic instrument that various waste computers, signal equipment, televisor, refrigerator, washing machine and unit eliminate etc.Estimate that according to the expert surplus the electrical equipment about 2800 such as the refrigerator that China scraps present every year, washing machine, computer, air-conditioning ten thousand, waste electronic electrical equipment total amount reaches 1,000,000 tons, and wherein printed circuit board (PCB) accounts for 4% of total amount greatly.
In printed circuit board (PCB), the content of metal is up to about 40%, and the rich ore metal content of occurring in nature only 3～5%.After magnetic separation, mainly be non-ferrous metal, wherein maximum is copper about 80%, also has 1.0～5.5% aluminium, 0.5～1.0% tin, 0.5～1.5% zinc, 0.5～1.0% bismuth, 0.05～1.0% lead, 0.5～1.0% antimony, 0.5～1.0% cadmium etc. in addition.Therefore, the metal that contains in " electronic waste " is tens times even a hundred times of natural mineral reserve.
Present waste and old printed circuit board resource treatment technique mainly contains hydrometallurgy, pyrometallurgy, mechanical treatment or several treatment technology and combines.Because mechanical treatment is easily realized through engineering approaches, can't produce secondary pollution, this method is favourably welcome.Chinese invention patent " a kind of printed circuit board (PCB) reclaims the method for valuable material " (Wang Wenbin, the patent No. 98105592.3) with waste and old printed circuit board successively through shredding, pulverize, bang, efflorescence and in tank gravitational segregation, realize separating of metal and non-metallic material.Chinese invention patent " process for breaking, separating and recovering of waste printed circuit board and equipment used thereof " (Shen Zhigang etc., the patent No. 99102862.7) waste and old printed circuit board is broken, carefully breaks through thick successively, pass through vibrosieve then, adopt airflow separator then, the realization metal separates with nonmetallic substance.Separate with nonmetallic though above method can realize metal, isolating metal is a hybrid metal, must carry out the separation of hybrid metal and purify, and the metal of recovery just can reach resource utilization.Document " research of reclaiming gold and copper from seal circuit card waste material " (Zhu Ping etc., " rare metal " 2002 the 3rd phases) has been introduced the employing hydrometallurgical technology and has been reclaimed metallic element in the printing seal circuit card waste material.But the subject matter that exists is that chemical consumption is big, the processing of waste liquid will cause secondary pollution, document " electron wastes present situation and resource technology thereof both at home and abroad " (Wei Jinxiu etc., " Donghua University's journal " the 3rd phase in 2005) has been introduced and has been adopted electrolytic process to carry out the separation of hybrid metal.But, in electrolytic process, produce problems such as obnoxious flavoures such as hydrogen fluoride, carbon monoxide, sulfurous gas and waste electrolyte serious environment pollution.
Summary of the invention
The objective of the invention is at the prior art above shortcomings, the vacuum distillation method for separating of cadmium element in a kind of waste and old printed circuit board hybrid metal is provided, cadmium is separated with hybrid metal, realize recovery, regeneration and recycling treatment cadmium metal in the waste and old printed circuit board.
For realizing this purpose, the present invention has adopted vacuum distillation method, its principle is based on that each component of metallic element has different vapour pressures in the waste printed circuit board under different temperature and pressures, in a vacuum by evaporation and condensation, metallic element is separated from each other under differing temps respectively, thereby realizes comprehensive utilization and recovery.
At the separation of cadmium element in the waste and old printed circuit board hybrid metal, the mixed metal powder that the present invention at first will contain cadmium through the waste and old circuit board of fragmentation heats in vacuum oven, at pressure 1 * 10
2～1 * 10
3Pa, temperature are to carry out the cadmium evaporation under 400～490 ℃ of conditions, carry out the cadmium vapor condensation by condenser simultaneously, thus cadmium are separated from hybrid metal.Specifically may further comprise the steps:
1, will be raw material through separating the mixed metal powder that broken waste and old circuit board contains cadmium, and put into plumbago crucible or adopt the crucible of high-temperature refractory knotting, again crucible be put into vacuum distillation furnace.
2, startup vacuum system in vacuum distillation furnace sealing back is bled, and the pressure that makes vacuum oven is 1 * 10
2～1 * 10
3Pa.
3, start the vacuum distillation furnace power supply, mixed metal powder in the crucible is heated to 400～490 ℃, keep temperature-resistant then, make cadmium element evaporation in the raw material, evaporation time is per kilogram raw material 10～15 minutes;
4, in the cadmium element evaporation, the condenser in the vacuum distillation furnace is heated to 320～350 ℃, carries out the cadmium vapor condensation, and the cadmium drop of condensation is flowed in the cadmium liquid recovery drippage groove, thus cadmium is separated from hybrid metal.
Vacuum distilling method of the present invention is simple, has characteristics such as cost is low, efficient, pollution-free, and the hybrid metal that distillation finishes can continue on for next step pointed purification to be separated.Compare the method that methods such as adopting baked wheaten cake and pickling reclaims valuable metal in the old circuit board, the present invention especially has advantage aspect the minimizing environmental pollution.
Embodiment
Below by specific embodiment technical scheme of the present invention is further described.
Embodiment 1
At first separated broken worn-out circuit card is contained 5 kilograms of raw materials of cadmium mixed metal powder and put into crucible, again crucible is put into vacuum distillation furnace.Vacuum distillation furnace sealing back starts vacuum system bleeds, and the pressure that makes vacuum oven is 1 * 10
3Pa.Start the melting heating member heating crucible in the vacuum distillation furnace, mixed metal powder in the crucible is heated to 490 ℃.Keep temperature-resistant then, make cadmium element evaporation in the raw material, evaporation time is 50 minutes.In the cadmium element evaporation, 320 ℃ of the heating of the condenser in the vacuum distillation furnace, carry out the cadmium vapor condensation, and the cadmium drop of condensation is flowed in the cadmium liquid recovery drippage groove, obtain cadmium 32 grams.The hybrid metal that distillation finishes carries out next step and continues the separation of purifying.
Embodiment 2
At first separated broken worn-out circuit card is contained 5 kilograms of raw materials of cadmium mixed metal powder and put into crucible, again crucible is put into vacuum distillation furnace.Vacuum distillation furnace sealing back starts vacuum system bleeds, and the pressure that makes vacuum oven is 5 * 10
2Pa.Start the melting heating member heating crucible in the vacuum distillation furnace, mixed metal powder in the crucible is heated to 450 ℃.Keep temperature-resistant then, make cadmium element evaporation in the raw material, evaporation time is 60 minutes.In the cadmium element evaporation, 340 ℃ of the heating of the condenser in the vacuum distillation furnace, carry out the cadmium vapor condensation, and the cadmium drop of condensation is flowed in the cadmium liquid recovery drippage groove, obtain cadmium 22 grams.The hybrid metal that distillation finishes carries out next step and continues the separation of purifying.
Embodiment 3
At first separated broken worn-out circuit card is contained cadmium mixed metal powder powder stock and put into crucible for 5 kilograms, again crucible is put into vacuum distillation furnace.Vacuum distillation furnace sealing back starts vacuum system bleeds, and the pressure that makes vacuum oven is 1 * 10
2Pa.Start the melting heating member heating crucible in the vacuum distillation furnace, mixed metal powder in the crucible is heated to 400 ℃.Keep temperature-resistant then, make cadmium element evaporation in the raw material, evaporation time is 75 minutes.In the cadmium element evaporation, 350 ℃ of the heating of the condenser in the vacuum distillation furnace, carry out the cadmium vapor condensation, and the cadmium drop of condensation is flowed in the cadmium liquid recovery drippage groove, obtain cadmium 20 grams.The hybrid metal that distillation finishes carries out next step and continues the separation of purifying.
Claims (1)
1, the vacuum distillation method for separating of cadmium element in a kind of waste and old printed circuit board hybrid metal is characterized in that may further comprise the steps:
1) will be raw material through separating the mixed metal powder that broken waste and old circuit board contains cadmium, and put into plumbago crucible or adopt the crucible of high-temperature refractory knotting, again crucible be put into vacuum distillation furnace;
2) startup vacuum system in vacuum distillation furnace sealing back is bled, and the pressure that makes vacuum oven is 1 * 10
2～1 * 10
3Pa;
3) start the vacuum distillation furnace power supply, mixed metal powder in the crucible is heated to 400～490 ℃, keep temperature-resistant then, make the cadmium element evaporation in the raw material, evaporation time is per kilogram raw material 10～15 minutes;
4) in the cadmium element evaporation, the condenser in the vacuum distillation furnace is heated to 320～350 ℃, carries out the cadmium vapor condensation, and the cadmium drop of condensation is flowed in the cadmium liquid recovery drippage groove, thus cadmium is separated from hybrid metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100309872A CN1760386A (en) | 2005-11-03 | 2005-11-03 | Vacuum distillation method for separating cadmium element from mixed metals in worn-out printing circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100309872A CN1760386A (en) | 2005-11-03 | 2005-11-03 | Vacuum distillation method for separating cadmium element from mixed metals in worn-out printing circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1760386A true CN1760386A (en) | 2006-04-19 |
Family
ID=36706606
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100309872A Pending CN1760386A (en) | 2005-11-03 | 2005-11-03 | Vacuum distillation method for separating cadmium element from mixed metals in worn-out printing circuit board |
Country Status (1)
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|---|---|
| CN (1) | CN1760386A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268549A (en) * | 2011-07-27 | 2011-12-07 | 上海交通大学 | Method for recovering cadmium from waste circuit board |
| CN103184347A (en) * | 2011-12-28 | 2013-07-03 | 广东先导稀材股份有限公司 | Preparation method of high purity cadmium |
| CN110016574A (en) * | 2019-03-18 | 2019-07-16 | 昆明理工大学 | Simple substance cadmium efficient recycling method and system in a kind of high temperature flue gas containing cadmium |
-
2005
- 2005-11-03 CN CNA2005100309872A patent/CN1760386A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102268549A (en) * | 2011-07-27 | 2011-12-07 | 上海交通大学 | Method for recovering cadmium from waste circuit board |
| CN103184347A (en) * | 2011-12-28 | 2013-07-03 | 广东先导稀材股份有限公司 | Preparation method of high purity cadmium |
| CN103184347B (en) * | 2011-12-28 | 2014-09-17 | 广东先导稀材股份有限公司 | Preparation method of high purity cadmium |
| CN110016574A (en) * | 2019-03-18 | 2019-07-16 | 昆明理工大学 | Simple substance cadmium efficient recycling method and system in a kind of high temperature flue gas containing cadmium |
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