CN1760384A - Vacuum distillation method for separating zinc element from mixed metals in worn-out printing circuit board - Google Patents
Vacuum distillation method for separating zinc element from mixed metals in worn-out printing circuit board Download PDFInfo
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- CN1760384A CN1760384A CNA2005100309853A CN200510030985A CN1760384A CN 1760384 A CN1760384 A CN 1760384A CN A2005100309853 A CNA2005100309853 A CN A2005100309853A CN 200510030985 A CN200510030985 A CN 200510030985A CN 1760384 A CN1760384 A CN 1760384A
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- zinc
- 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 Zn 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 Zn at 500-600 deg.C and condensing the Zn vapor at 420-450 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 zinc 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 one 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 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 zinc element in a kind of waste and old printed circuit board hybrid metal is provided, zinc is separated with hybrid metal, realize recovery, regeneration and recycling treatment metallic zinc 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 each component of metallic element in the waste printed circuit board under different temperature and different pressure, has different vapour 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 zinc element in the waste and old printed circuit board hybrid metal, the present invention at first will heat in vacuum oven through the zinciferous mixed metal powder of the waste and old circuit board of fragmentation, at pressure 1 * 10
2～1 * 10
3Pa, temperature are to carry out the zinc evaporation under 500～600 ℃ of conditions, carry out zinc vapor condensation by condenser simultaneously, thus zinc are separated from hybrid metal.Specifically may further comprise the steps:
1, will be raw material through separating the broken zinciferous mixed metal powder of waste and old circuit board, the crucible of putting into plumbago crucible or adopting high-temperature refractory to tie a knot be put into vacuum distillation furnace to crucible again.
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 500～600 ℃, keep temperature-resistant then, make zinc element evaporation in the raw material, evaporation time is per kilogram raw material 10～15 minutes;
4, in the zinc element evaporation, the condenser in the vacuum distillation furnace is heated to 420～450 ℃, carries out zinc vapor condensation, and the zinc drop of condensation is flowed in the zinc liquid recovery drippage groove, thus zinc 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 zincium 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 600 ℃.Keep temperature-resistant then, make zinc element evaporation in the raw material, evaporation time is 50 minutes.In the zinc element evaporation, 420 ℃ of the heating of the condenser in the vacuum distillation furnace, carry out zinc vapor condensation, and the zinc drop of condensation is flowed in the zinc liquid recovery drippage groove.Obtain zinc 48 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 zincium 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 550 ℃.Keep temperature-resistant then, make zinc element evaporation in the raw material, evaporation time is 60 minutes.In the zinc element evaporation, 430 ℃ of the heating of the condenser in the vacuum distillation furnace, carry out zinc vapor condensation, and make the zinc drop of condensation flow in the zinc liquid recovery drippage groove zinc 40 grams that obtain.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 the zincium mixed metal powder raw material 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 500 ℃.Keep temperature-resistant then, make zinc element evaporation in the raw material, evaporation time is 75 minutes.In the zinc element evaporation, 450 ℃ of the heating of the condenser in the vacuum distillation furnace, carry out zinc vapor condensation, and the zinc drop of condensation is flowed in the zinc liquid recovery drippage groove, obtain zinc 27 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 zinc 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 broken zinciferous mixed metal powder of waste and old circuit board, the crucible of putting into plumbago crucible or adopting high-temperature refractory to tie a knot be put into vacuum distillation furnace to crucible again;
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 500～600 ℃, keep temperature-resistant then, make the zinc element evaporation in the raw material, evaporation time is per kilogram raw material 10～15 minutes;
4) in the zinc element evaporation, the condenser in the vacuum distillation furnace is heated to 420～450 ℃, carries out zinc vapor condensation, and the zinc drop of condensation is flowed in the zinc liquid recovery drippage groove, thus zinc is separated from hybrid metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100309853A CN1760384A (en) | 2005-11-03 | 2005-11-03 | Vacuum distillation method for separating zinc element from mixed metals in worn-out printing circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2005100309853A CN1760384A (en) | 2005-11-03 | 2005-11-03 | Vacuum distillation method for separating zinc element from mixed metals in worn-out printing circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1760384A true CN1760384A (en) | 2006-04-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2005100309853A Pending CN1760384A (en) | 2005-11-03 | 2005-11-03 | Vacuum distillation method for separating zinc element from mixed metals in worn-out printing circuit board |
Country Status (1)
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| CN (1) | CN1760384A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100494430C (en) * | 2006-06-23 | 2009-06-03 | 宝山钢铁股份有限公司 | Method for producing zinc alloy from zinc dross |
| CN101824547A (en) * | 2010-06-02 | 2010-09-08 | 天津大学 | Method for vacuum liquating, crystallizing, separating and recycling lead and zinc in metal of waste circuit board |
| CN102268550A (en) * | 2011-07-27 | 2011-12-07 | 上海交通大学 | Recovering method of zinc in waste circuit board |
| CN106834694A (en) * | 2017-01-03 | 2017-06-13 | 长沙汇聚环境技术有限公司 | A kind of recovery method of waste printed circuit board metals resources |
| CN108199003A (en) * | 2017-12-27 | 2018-06-22 | 长安大学 | A kind of big/mesoporous antimony cathode of three-dimensional, preparation method and applications |
| CN113321236A (en) * | 2020-07-31 | 2021-08-31 | 上海交通大学 | Method for preparing zinc sulfide ultrafine powder by using zinc skins of waste zinc-manganese battery |
-
2005
- 2005-11-03 CN CNA2005100309853A patent/CN1760384A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100494430C (en) * | 2006-06-23 | 2009-06-03 | 宝山钢铁股份有限公司 | Method for producing zinc alloy from zinc dross |
| CN101824547A (en) * | 2010-06-02 | 2010-09-08 | 天津大学 | Method for vacuum liquating, crystallizing, separating and recycling lead and zinc in metal of waste circuit board |
| CN102268550A (en) * | 2011-07-27 | 2011-12-07 | 上海交通大学 | Recovering method of zinc in waste circuit board |
| CN106834694A (en) * | 2017-01-03 | 2017-06-13 | 长沙汇聚环境技术有限公司 | A kind of recovery method of waste printed circuit board metals resources |
| CN106834694B (en) * | 2017-01-03 | 2019-05-21 | 大连易舜绿色科技有限公司 | A kind of recovery method of waste printed circuit board metal resource |
| CN108199003A (en) * | 2017-12-27 | 2018-06-22 | 长安大学 | A kind of big/mesoporous antimony cathode of three-dimensional, preparation method and applications |
| CN113321236A (en) * | 2020-07-31 | 2021-08-31 | 上海交通大学 | Method for preparing zinc sulfide ultrafine powder by using zinc skins of waste zinc-manganese battery |
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