CN201411492Y - Equipment for recovering high-purity copper block from low-copper containing waste liquor - Google Patents
Equipment for recovering high-purity copper block from low-copper containing waste liquor Download PDFInfo
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- CN201411492Y CN201411492Y CN2009200629338U CN200920062933U CN201411492Y CN 201411492 Y CN201411492 Y CN 201411492Y CN 2009200629338 U CN2009200629338 U CN 2009200629338U CN 200920062933 U CN200920062933 U CN 200920062933U CN 201411492 Y CN201411492 Y CN 201411492Y
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- electrodeposition
- bucket
- copper
- negative electrode
- containing 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
The utility model relates to equipment for recovering high-purity copper blocks from low-copper containing waste liquor, comprising a circulating groove, an acid corrosion resisting pump, an electrodeposition barrel, a DC power supply, a cleaning groove and a drying roasting case, wherein the circulating groove internally contains the low-copper containing waste liquor; the liquor feeding end of the acid corrosion resisting pump is connected and communicated with the circulating groove, and the liquor discharging end of the same is connected and communicated with the liquor feeding end of theelectrodeposition barrel; the liquor discharging end of the upper part of the electrodeposition barrel returns to be connected and communicated with the circulating groove; the electrodeposition barrel is internally provided with a cathode barrel, the cathode barrel is transmitted by a variable frequency motor to rotate circumferentially, a central conducting copper shaft of the cathode barrel isconnected with the negative end of the DC power supply, the anode of the electrodeposition barrel is connected with the positive end of the DC power supply, and the cleaning drying equipment of the cathode barrel and cathode copper after electrodeposition is finished is the cleaning groove and the drying roasting case. The utility model has the advantages of simple technological process, convenient and fast operation, easy operation control, little equipment investment, low operation cost, good environmental protection property and high economic value.
Description
Technical field
The utility model relates to a kind of the extraction and reclaims equipment high-purity, fine and close, block copper billet from low copper containing, nickel or other low-metal content waste liquid, belong to recycling metallurgical and trade waste.
Background technology
In recent years, along with the steady-state growth of world's electronic industry, the printed circuit board (pcb) manufacturing of China is also fast-developing, and its output and the output value have been listed as at the forefront in the world.Statistics according to authoritative institution, the printed circuit board output of China in 2006 is 13,000 ten thousand square metres, 10,000 square metres of circuit cards of every production will produce 50-100 ton heavy metal waste liquid (based on contained waste liquid), mainly be divided into alkaline etching liquid, acidic etching liquid, the comprehensive waste liquid of low copper containing etc.Because alkaline etching liquid, acidic etching liquid content of copper ion restrain more than every liter, so the recovery value height up to 100.The comprehensive waste liquid of low copper containing is meant in the wiring board production process and changes cylinder liquid or change the cylinder rinse water with the copper bearing of operations generation such as chemical copper, melanism line, brown line, internal layer pre-treatment, anti-pre-welding treatment, change gold and silver line, the thin copper of erosion, sea line, OSP, general designation low copper containing waste liquid, main component is Cu
2+, HCl, H
2SO
4, oxygenant, stablizer and other additives etc., copper content is low by (2～45g/L), about average 9g/L, recycle with the waste liquid of the present technology that is had so low copper content, enterprise is profitless, and therefore present most of wiring board manufacturing enterprise can only transfer to the comprehensive waste liquid of low copper containing in the mode of paying and handle the merchant and handle.
Current, China remains the populous nation of a shortage of resources, environment fragility, and it is very necessary to make rational use of resources.Valuable metal copper in the low copper containing waste liquid is effectively reclaimed, make high-purity, fine and close, the blocky cathode copper of its output not only can realize the utilization again of resource, can also solve the awkward situation that value that current low copper containing waste liquid in the face of PCB institute output contained be nobody shows any interest in, make PCB manufacturing enterprise and wastewater treatment merchant obtain favorable economic benefit.Realize enterprise, society fully, the environmental protection win-win.
At present, the low copper containing Wastewater Recovery treatment technology that is produced in the PCB production process there is following several technology: neutralization precipitation method, extraction-electrodeposition method, common electrodeposition extraction method.The most general in the above-mentioned technology with the use of neutralization precipitation method, but owing to their limitation own, all fail the value that low copper containing waste water is contained is used to greatest extent.
The ultimate principle of neutralization precipitation method technology is that the concentration of copper hydroxide in the aqueous solution is long-pending very little, by adjusting the pH value of solution, cupric ion is separated out with the form precipitation of copper hydroxide, add flocculation agent and filtering method again and reach the purpose that cupric ion in the low copper containing waste liquid is removed in recovery.The defective of this technology is the mud copper content only 2～5% of output, is unfavorable for next step efficient recovery to copper, and economic worth is not high, as the method that adopts pyrogenic process it is reclaimed and will cause secondary pollution to environment.Simultaneously, need to consume a large amount of alkali and flocculation agent in treating processes, processing cost is higher, and is disproportionate with the income that is obtained.
Summary of the invention:
Technical problem to be solved in the utility model is: solve the problem that above-mentioned prior art exists, and provide reclaim a kind of waste liquid of, complex chemical composition low from content of copper ion that printed circuit board produced produce that high purity, densification, blocky copper coin, technical process are simple, convenient and easily-controlled operation, facility investment be few.Running cost is low, the equipment that reclaims high-purity copper billet from the low copper containing waste liquid of good environmental protection.
The technical solution adopted in the utility model is: this equipment that reclaims high-purity copper billet from the low copper containing waste liquid comprises circulation groove, acid resistance corrosion pump, the electrodeposition bucket, direct supply, rinse bath, dry baking box, splendid attire low copper containing waste liquid in the circulation groove, the liquid feeding end of acid resistance corrosion pump connects circulation groove, the outlet end of acid resistance corrosion pump connects electrodeposition bucket bottom liquid feeding end, electrodeposition bucket top outlet end returns and connects to circulation groove, the negative electrode bucket is installed in the electrodeposition bucket, the negative electrode bucket is done the circumference rotation by the variable-frequency motor transmission, negative electrode bucket center conductive copper axle connects the direct supply negative terminal, electrodeposition bucket anode connects the direct supply anode, and the negative electrode bucket after electrodeposition finishes and the cleaning and drying device of cathode copper are rinse bath and drying oven.
In the technique scheme, after cathode copper stripped down from the negative electrode bucket, exsiccant baking box temperature was 150-180 ℃, 30 minutes time.
In the technique scheme, the negative electrode bucket is made by the titanium plate or the stainless steel plate of 1.5-2.0 mm thick, and the mercury contact is adopted in contacting of negative electrode bucket and negative electrode conducting copper, and the speed that negative electrode can 30-60 rev/min in the electrodeposition production process is done circumference and rotatablely moved.。
In the technique scheme, the anode bucket is made by the titanium plate of the graphite cake of insoluble or surface-coated noble ruthenium, iridium oxide.
In the technique scheme, the low copper containing waste liquid enters from electrodeposition bucket bottom, for the bottom tangentially enters, and is close to the cathode surface rotation and rises, and is flowed out by electrodeposition bucket top at last; Perhaps the low copper containing waste liquid is sprayed onto cathode surface by the mode of spray; Reduce the solution layer fluid layer thickness of cathode surface to greatest extent, cathode surface solution is in turbulence state.
In the technique scheme, the circulation groove top also is connected tail gas recovery tower by pipeline with vacuum fan.
In the technique scheme, the electrodeposition bucket can be for a plurality of, serial or parallel connection; During series connection, the outlet end of a last electrodeposition bucket connects the liquid feeding end of next electrodeposition bucket, and the outlet end of last electrodeposition bucket is connected to circulation groove; When in parallel, all electrodeposition bucket bottom liquid feeding ends connect acid resistance corrosion delivery side of pump, and the outlet end on all electrodeposition bucket tops all is connected to circulation groove.
The utility model is compared with prior art, has outstanding characteristics and progress:
1. the neutralization precipitation method of prior art
The ultimate principle of this technology is that the concentration of copper hydroxide in the aqueous solution is long-pending very little, by adjusting the pH value of solution, cupric ion is separated out with the form precipitation of copper hydroxide, add flocculation agent and filtering method again and reach the purpose that cupric ion in the low copper containing waste liquid is removed in recovery.The defective of this technology is the mud copper content only 2～5% of output, is unfavorable for next step efficient recovery to copper, and economic worth is not high, as the method that adopts pyrogenic process it is reclaimed and will cause secondary pollution to environment.Simultaneously, need to consume a large amount of alkali and flocculation agent in treating processes, processing cost is higher, and is disproportionate with the income that is obtained.
2. extraction-the electrodeposition process of prior art
The principle of this technology is by the selective adsorption of extraction agent to cupric ion, cupric ion in the low copper containing waste liquid is enriched in the extraction agent, again with sulfuric acid do reverse-extraction agent with the cupric ion back extraction in the extraction liquid to sulphuric acid soln, by flat Winning cell the copper bearing sulphuric acid soln of height is carried out electrodeposition at last and reclaim, obtain high purity, densification, blocky cathode copper product.This technology can finally obtain the high cathode copper product of economic worth, but it also has the following disadvantages: subject range is little, and to containing the low copper containing waste liquid of strong oxidized form material such as nitric acid, hydrogen peroxide, the work-ing life of extraction agent is short.The equipment one-time investment is big, is unsuitable for the little and dispersive characteristics of amount that the low copper containing waste liquid is had.Technical process is long, and is wayward.It is limited that extraction agent is reused number of times, and running cost is higher.
3. the flat electrodeposition treatment process of prior art
This technology is a kind of traditional electrodeposition process, and its principle is under galvanic effect, and anode and cathode is carried out redox reaction, mainly carries out cupric ion and the hydrionic electronic reduction reaction that gets on the negative electrode, separates out with the form of elemental copper and hydrogen.Carry out anionic betatopic oxidizing reactions such as hydroxide ion and chlorion on the anode, separate out with the form of other gases such as oxygen and chlorine.Utilize flat electrodeposition treatment process to handle the low copper containing waste liquid and mainly embody following shortcoming: at first, it can only output sponge copper powder, owing to there is not effective means that it is carried out Passivation Treatment, make the final copper content of sponge copper powder have only 80-95%, economic worth declines to a great extent.Secondly its current efficiency is only less than 65%, and then up to 6000-8000 degree electricity, processing cost is quite high for the energy consumption of cathode copper per ton.Another is exactly that its production capacity is little, if reach the purpose that increases production capacity by the method that improves cathode current density, its current efficiency will be lower so, and power consumption will further improve.
4. rotating cathode treatment technology of the present utility model
The generation of the utility model rotating cathode treatment technology is to have carried out effective improvement and perfect on the technical foundation of flat electrodeposition treatment process, makes it form a kind of new technology that reclaims the low copper containing waste liquid of handling.Its main technical principle is, design by rotating cathode electrodeposition bucket and to the change of the control of internal circulating load and electric effusion in the cathode surface flow pattern, reach the circulating effect of strengthening electric effusion, make the solution of cathode surface be in turbulence state, the molten difference of cupric ion that reduces the cathode surface generation in electrolytic deposition process of low copper containing waste liquid to greatest extent polarizes, and reaches to remedy the low copper containing waste liquid because content of copper ion is crossed low disadvantageous effect to the electrodeposition removal process.Making it be more conducive to form compact crystal is blocky cathode copper product.
Utilize rotating cathode treatment technology processing recovery low copper containing waste liquid to compare with existing processing recovery technology and have following advantage: 1. the rotating cathode treatment technology can extract high-purity, fine and close, blocky cathode copper product by electrodeposition from the low copper containing waste liquid.2. the copper ion concentration of low copper containing waste liquid waste liquid after the rotating cathode electrodeposition is carried copper can be reduced to every liter of 0.5 gram, and the rate of recovery of copper reaches 95-99%.The purity of cathode copper product reaches 99.8%-99.95%.3. utilize the production cost of rotating cathode treatment technology processing low copper containing waste liquid low, the power consumption that extracts one ton of copper is in 3500-4000 degree electricity.4. rotating cathode device fabrication cost is low, and processing technological flow is short, is convenient to operation control.5. the entire treatment process is carried out in the system of a sealing, discharges the production process environmental protection in atmosphere without any toxic and harmful.
Description of drawings
Fig. 1 is the utility model equipment synoptic diagram;
Fig. 2 is the utility model electrodeposition barrel structure synoptic diagram.
The accompanying drawing marking explanation:
1---acid resistance corrosion pump 2---electrodeposition bucket 3---direct supply
4---circulation groove 5---waste water storage tank 6---negative electrode conductive copper axles
7---tail gas recovery tower 8---rinse bath 9---cathode copper baking boxes
10---anode conducting copper bar 11---anode 12---negative electrode buckets
13-fluid inlet 14---liquid outlet 15---bearing
16---sealing-ring 17---mercury cup 18---belts
19---variable-frequency motor 20---copper axle steel bushing
Embodiment
Referring to accompanying drawing, the utility model reclaims the high purity copper billet from the low copper containing waste liquid method is: at first with acid resistance corrosion pump 1 the low copper containing waste liquid is imported electrodeposition bucket 2 from circulation groove 4, the low copper containing waste liquid enters from electrodeposition bucket 2 bottoms, flow out by electrodeposition bucket 2 tops, and finally flow back into circulation groove 4, meanwhile, the negative electrode bucket 12 that variable-frequency motor 19 drives in the electrodeposition buckets 2 rotatablely moves as circumference, direct supply 3 is connected direct current to negative electrode bucket 12 and anode electrodeposition bucket 2, separate out high-purity on the negative electrode bucket 12, fine and close, blocky copper, below copper ion concentration in the electric effusion drops to 0.5 grams per liter, electrolytic deposition process finishes, close direct supply 3, negative electrode bucket rotation variable-frequency motor 19 and acid resistance corrosion pump 1, take out negative electrode bucket 12 and put into 8 immersions of warm water rinse bath, use cold water flush again, then clean cathode copper is stripped down from negative electrode bucket 12, drying again, cooling, finally obtaining purity is the block cathode copper product of 99.8-99.95%.
Variable-frequency motor 19 rotating speeds of above-mentioned drive negative electrode bucket rotation are 30-60 commentaries on classics/per minute.In the operation, cathode current density is controlled at 300-800 peace/every square metre.After electrolytic deposition process finished, negative electrode bucket 12 was put into warm water rinse bath 8 and is soaked 80 ℃ of water temperatures, soak time 30 minutes.After cathode copper stripped down from negative electrode bucket 12, the exsiccant oven temperature was 150-180 ℃, 30 minutes time.Above-mentioned negative electrode bucket 12 is made by the titanium plate or the stainless steel plate of 1.5-2.0 mm thick.Above-mentioned low copper containing waste liquid enters from electrodeposition bucket bottom, for the bottom tangentially enters, and is close to the cathode surface rotation and rises, and is flowed out by electrodeposition bucket top at last; Perhaps the low copper containing waste liquid is sprayed onto cathode surface by the mode of spray; Reduce the solution layer fluid layer thickness of cathode surface to greatest extent, cathode surface solution is in turbulence state.
The equipment that reclaims high-purity copper billet from the low copper containing waste liquid of the present utility model comprises circulation groove 4, acid resistance corrosion pump 1, electrodeposition bucket 2, direct supply 3, rinse bath 8, dry baking box 9, splendid attire low copper containing waste liquid in the circulation groove 4, the liquid feeding end of acid resistance corrosion pump 1 connects circulation groove 4, the outlet end of acid resistance corrosion pump 1 connects electrodeposition bucket 2 bottom liquid feeding ends, electrodeposition bucket 2 top outlet ends return and connect circulation groove 4, negative electrode bucket 12 is installed in the electrodeposition bucket 2, negative electrode bucket 12 is done the circumference rotation by variable-frequency motor 19 transmissions, negative electrode bucket 12 center conductive copper axles 6 connect direct supply 3 negative terminals, electrodeposition bucket 12 anodes connect direct supply 3 anodes, and the cleaning and drying device that electrodeposition finishes back negative electrode bucket 12 and cathode copper is rinse bath 8 and dry baking box 9.
Above-mentioned circulation groove 4 tops also are connected tail gas recovery tower 7 by pipeline with vacuum fan.
Above-mentioned electrodeposition bucket 2 can be for a plurality of, serial or parallel connection; During series connection, the outlet end of a last electrodeposition bucket connects the liquid feeding end of next electrodeposition bucket, and the outlet end of last electrodeposition bucket is connected to circulation groove 4; When in parallel, all electrodeposition bucket 2 bottom liquid feeding ends connect the output terminal of acid resistance corrosion pump 1, and the outlet end on all electrodeposition bucket 2 tops all is connected to circulation groove 4.
The utility model is described in further detail below in conjunction with drawings and Examples:
Production method of the present utility model is the valuable metal copper resource recovery at the low copper containing waste liquid, is that example describes with output microetch low copper containing waste liquid in the printed circuit board production process now.
At first, microetch low copper containing waste liquid is imported electrodeposition bucket 2 and circulation groove 4, open acid resistance corrosion pump 1 and carry out the circulation of electric effusion in whole circulation system.Open rotating cathode bucket power variable-frequency motor 19 is provided, and regulate frequency transformer according to processing requirement, the speed of rotation that makes negative electrode is at 60 rpms, and connection tail gas recovery tower 7 power supplys make it in running order.Finish after the above-mentioned work by direct supply 3 to electrodeposition bucket input dc power, the electrodeposition that begins to carry out printed circuit board microetch low copper containing waste liquid is carried copper.Can carry out the suitable adjustment of received current intensity according to the decline degree of cupric ion in the electric effusion in electrolytic deposition process, the adjustment foundation of strength of current is to guarantee that cathode copper forms densification, block crystallization, can not form the powdery crystallization.When the copper ion concentration of electric effusion dropped to every liter of 0.5 gram, whole electrolytic deposition process finished, deenergization.Discharging of waste liquid enters waste water station and handles to waste water storage tank 5 behind the electrodeposition.Will the negative electrode bucket 12 put into rinse bath 8 after taking out and clean, guarantee the cathode copper surface, and after cleaning up cathode copper be stripped down from the negative electrode bucket 12 fully and put into baking box 9 bakings, finally obtain qualified cathode copper product without any residual electric effusion.The main electrode reaction of electrolytic deposition process:
Mainly carry out the betatopic reaction of hydroxide ion and chlorion on the anode:
4OH
--4e→O
2+2H
2O
2Cl
--2e→Cl
2
Mainly carry out on the negative electrode cupric ion electron reaction and side reaction hydrionic electron reaction:
Cu
2++2e→Cu
2H
++2e→H
2
Embodiment
1 implementation condition and processing parameter
Handle microetch liquid cupric content: 7 grams per liters
Electric effusion volume: 560 liters
Electric effusion speed of circulation: 80 liters/minute
Negative electrode speed of rotation: 60 rev/mins
Negative electrode useful area: 0.7 square metre
Cathode current density: 400 peaces/square metre
Bath voltage: 2.9-2.6 volt
2 results of implementation
Whole electrolytic deposition process has carried out 13.7 hours altogether, output densification, blocky cathode copper 3600 grams, and printed circuit board microetch low copper containing waste liquid copper ion concentration after the electrodeposition recycling drops to every liter of 0.5 gram.
As calculated, utilize the rotating cathode technical finesse to reclaim valuable metal copper in the printed circuit board microetch low copper containing waste liquid, the copper recoveries that its cathode efficiency is 80%, power consumption is 3500 degree cathode copper per ton, printed circuit board microetch low copper containing waste liquid are 91.8%, the purity of cathode copper reaches 99.828%.
Claims (3)
1, a kind of equipment that from the low copper containing waste liquid, reclaims high-purity copper billet, it is characterized in that comprising circulation groove, acid resistance corrosion pump, the electrodeposition bucket, direct supply, rinse bath, dry baking box, splendid attire low copper containing waste liquid in the circulation groove, the liquid feeding end of acid resistance corrosion pump connects circulation groove, the outlet end of acid resistance corrosion pump connects electrodeposition bucket bottom liquid feeding end, electrodeposition bucket top outlet end returns and connects to circulation groove, the negative electrode bucket is installed in the electrodeposition bucket, the negative electrode bucket is done the circumference rotation by the variable-frequency motor transmission, negative electrode bucket center conductive copper axle connects the direct supply negative terminal, electrodeposition bucket anode connects the direct supply anode, and the back negative electrode bucket that electrodeposition finishes and the cleaning and drying device of cathode copper are rinse bath and drying oven.
2, the equipment that from the low copper containing waste liquid, reclaims the high purity copper billet according to claim 1, it is characterized in that: the electrodeposition bucket can be for a plurality of, serial or parallel connection; During series connection, the outlet end of a last electrodeposition bucket connects the liquid feeding end of next electrodeposition bucket, and the outlet end of last electrodeposition bucket is connected to circulation groove; When in parallel, all electrodeposition bucket bottom liquid feeding ends connect acid resistance corrosion delivery side of pump, and the outlet end on all electrodeposition bucket tops all is connected to circulation groove.
3, the equipment that from the low copper containing waste liquid, reclaims the high purity copper billet according to claim 1, it is characterized in that: the negative electrode bucket is made by the titanium plate or the stainless steel plate of 1.5-2.0 mm thick, the mercury contact is adopted in contacting of negative electrode bucket and negative electrode conducting copper, and the speed that negative electrode can 30-60 rev/min in the electrodeposition production process is done circumference and rotatablely moved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200629338U CN201411492Y (en) | 2009-01-15 | 2009-01-15 | Equipment for recovering high-purity copper block from low-copper containing waste liquor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200629338U CN201411492Y (en) | 2009-01-15 | 2009-01-15 | Equipment for recovering high-purity copper block from low-copper containing waste liquor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201411492Y true CN201411492Y (en) | 2010-02-24 |
Family
ID=41713379
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200629338U Expired - Lifetime CN201411492Y (en) | 2009-01-15 | 2009-01-15 | Equipment for recovering high-purity copper block from low-copper containing waste liquor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201411492Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192660A (en) * | 2017-05-27 | 2017-09-22 | 中国科学院上海技术物理研究所 | It is a kind of to be used for the apparatus and method that dynamic observes Cdl-x_Znx_Te chemical attack hole |
| CN108950599A (en) * | 2018-08-27 | 2018-12-07 | 苏碧云 | A kind of method of electrolysis system device and cathode copper |
| CN110699708A (en) * | 2019-09-25 | 2020-01-17 | 广西金川有色金属有限公司 | Method for reducing silver content in electrolytic cathode copper |
-
2009
- 2009-01-15 CN CN2009200629338U patent/CN201411492Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107192660A (en) * | 2017-05-27 | 2017-09-22 | 中国科学院上海技术物理研究所 | It is a kind of to be used for the apparatus and method that dynamic observes Cdl-x_Znx_Te chemical attack hole |
| CN107192660B (en) * | 2017-05-27 | 2023-09-12 | 中国科学院上海技术物理研究所 | Device and method for dynamically observing tellurium-zinc-cadmium material chemical corrosion pits |
| CN108950599A (en) * | 2018-08-27 | 2018-12-07 | 苏碧云 | A kind of method of electrolysis system device and cathode copper |
| CN110699708A (en) * | 2019-09-25 | 2020-01-17 | 广西金川有色金属有限公司 | Method for reducing silver content in electrolytic cathode copper |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: HU'NAN VARY TECHNOLOGY CO., LTD. Free format text: FORMER NAME: HUNAN VARY SCI-TECH CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 410100 Changsha hunters road in Hunan Province Economic and Technological Development Zone No. 11 Patentee after: Hunan Vary Tech Co., Ltd. Address before: 410100 Hunan Province Economic and Technological Development Zone Changsha County Panpan Road No. 11 Patentee before: Hunan Vary Sci-Tech Co., Ltd. |
|
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Chenzhou Wanrong Metal Processing Co., Ltd. Assignor: Hunan Vary Tech Co., Ltd. Contract record no.: 2012430000142 Denomination of utility model: Equipment for recovering high-purity copper block from low-copper containing waste liquor Granted publication date: 20100224 License type: Exclusive License Record date: 20120618 |
|
| CX01 | Expiry of patent term |
Granted publication date: 20100224 |
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| CX01 | Expiry of patent term |