CN101748084A - Normal temperature acidophilic leaching-ore bacteria and two-step leaching method for leaching metals in waste circuit board - Google Patents
Normal temperature acidophilic leaching-ore bacteria and two-step leaching method for leaching metals in waste circuit board Download PDFInfo
- Publication number
- CN101748084A CN101748084A CN200810240058A CN200810240058A CN101748084A CN 101748084 A CN101748084 A CN 101748084A CN 200810240058 A CN200810240058 A CN 200810240058A CN 200810240058 A CN200810240058 A CN 200810240058A CN 101748084 A CN101748084 A CN 101748084A
- Authority
- CN
- China
- Prior art keywords
- leaching
- circuit board
- bacterium
- old circuit
- normal temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides normal temperature acidophilic leaching-ore bacteria and a two-step leaching method for leaching metals in a waste circuit board. The name of the normal temperature acidophilic leaching-ore bacteria is Thiobacillus ferrooxidans Retech-XI, the preservation register number is CCTCC No:M207159, the preservation date is on October 16th in 2007, the preservation unit is China Center for Type Culture Collection, and the address of China Center for Type Culture Collection is in the Wuhan University. The two-step leaching method for leaching the metals in the waste circuit board comprises the following steps: carrying out rejuvenation acclimatisation and amplification culture of the normal temperature acidophilic bacteria (Thiobacillus ferrooxidans Retech-XI); cultivating acclimatisation bacteria to obtain concentration bacteria and concentration solution of Fe3+; before carrying out leaching, adding FeS2 concentrate ore into the obtained concentration solution to balance the rising of the pH value in the leaching process and supplement the iron source; and adding waste circuit board powders into the concentration solution to carry out leaching and carrying out solid-liquid separation and metal recovery. The invention has the advantages of being beneficial for the environment protection, also being used for recovering the precious metal sources in the waste circuit board, balancing the rising of the pH value in the process of adding the waste circuit board powders into the culture solution, improving the processing capacity that the bacteria leaches the waste circuit board, improving the leaching efficiency and supplementing the lost Fe caused by the coprecipitation phenomena occurring in the leaching process.
Description
Technical field
The present invention relates to a normal temperature acidophilic acidleach ore deposit bacterium and be used for leaching the leaching method of old circuit board metal, utilize this bacterial classification by with Fe in the solution
2+Be oxidized to Fe
3+, Fe then
3+Come metal in the oxidation old circuit board, make metal simple-substance be dissolved as metal ion, for improving the efficient of leaching process, this patent has been invented the method for metal in the two steps leaching old circuit board.
Background technology
In the discarded circuit board only the content of copper also contain the rare precious metals such as gold and silver, platinum of metal such as aluminium, iron and trace in addition promptly up to 20%.Thereby electric waste has the value more much higher than common municipal wastes.Adopt the precious metals such as gold in the biotechnology extraction waste printed circuit board, have the advantage that technology is simple, expense is low, easy to operate.But find that under study for action in the leaching process, bacterium is poor growth in the nutrient solution that adds wiring board, and rise phenomenon between 3～4 of pH value occurs, this is unfavorable for the growth of bacterium, and makes the leaching rate reduction of metal in the wiring board.Therefore, be necessary to provide a kind of method to solve this problem, to improve leaching rate.
Summary of the invention
First purpose of the present invention provides a normal temperature acidophilic acidleach ore deposit bacterium;
Second purpose of the present invention provides a kind of method, this method is different from the bacterium leaching agent is joined in the wiring board powder, it is the wiring board powder to be joined cultivate in the sophisticated bacterium liquid, the characteristics of this method are that microbial culture and two processes of bacterium leaching are separately carried out, avoid the bacterium disadvantageous inferior position of in the wiring board environment, growing, improved the speed that leaches metal in the wiring board.
The 3rd purpose of the present invention provides a kind of ore (FeS that adds in leaching process
2Concentrate), this ore (FeS
2Concentrate) guarantee the source of iron that needs in the leaching process, the acid meeting that under bacteriological action, produces of this ore simultaneously to leaching process in the variation generation poising action of pH value.
For achieving the above object, the present invention takes following design, and it may further comprise the steps:
(1) is suitable for leaching the acquisition of the bacterial classification of metal in the old circuit board
The used bacterial classification of the present invention is for having a liking for the ferrous thiobacillus of acid oxidase, name is called Thiobacillus ferrooxidansRetech-XI, preservation registration number is CCTCC No:M207159, October 16 2007 preservation day, after obtaining this bacterial classification, the pH value be 1.5～2.5 contain heavy metal ion (Cu
2+, Zn
2+, Sn
2+, Al
3+, pb
2+, Ni
2+, Ag
+) the 9K nutrient solution in carry out bacterial adaptation domestication and cultivate 2～5 times.The amount that contains above each heavy metal species in the wiring board is respectively: Cu:15～25%, Zn:1.5～3%, Sn:3～5%, Al:1～3%, Pb:1.5～3%, Ni:1～3%, Ag:0.005～0.05%.The concentration that adds wiring board during according to leaching is 30～50g/L, and the concentration of heavy metal is made as Cu respectively in the 9K nutrient solution
2+: 5～20g/L, Zn
2+: 0.5～3g/L, Sn
2+: 1～3g/L, Al
3+: 0.5～3g/L, pb
2+: 0.5～3g/L, Ni
2+: 0.5～3g/L, Ag
+: 0.002～0.05g/L.Carry out then step by step amplification culture 2～5 times according to the concentration that adds wiring board.Wherein bacterial load is 10～30% of a culture cumulative volume, and obtaining bacteria concentration is 10
7～10
9The ore deposit bacterium is soaked in the adaptability domestication of individual/ml, and its growth temperature is at 30～35 ℃, and pH is between 1.5～2.5, and this bacterium is strong to preventing from heavy metal, is used to carry out the biology leaching of old circuit board subsequently.(kind of domestication heavy metal ion can be selected according to contained heavy metal in the wiring board, the domestication concentration amounts is undertaken by above amount), during actual the leaching, according to the heavy metal kind that is contained in the wiring board, selection is carried out the heavy metal domestication to bacterium, and the concentration that the heavy metal that contains is tamed is still set by above concentration.
(2) to the processing of old circuit board
At first hand-crushed becomes less than the 70mm fritter, sends into general cutting grinding machine and variable-ratio high speed rotating pulverizer then successively and carries out two-stage and pulverize, and finally obtains the crushed products of granularity for-0.5mm.
(3) leaching process is carried out the first step, the cultivation of thiobacillus ferrooxidant
(Thiobacillus ferrooxidans Retech-XI) is inoculated into the nutrient solution at 9K with the normal temperature acidophilic bacteria, inoculum size wherein bacterial load is 10～20% of a culture cumulative volume, in incubator, cultivated 3～4 days, temperature is 30～35 ℃, rotating speed is 150～160rpm, and pH is set at 1.7～2.0.During the redox potential 500～600mv in nutrient solution (Vs.SCE is meant that measured redox potential value is the observed value with respect to standard calomel electrode), the bacterium number is 10 in the nutrient solution
7Individual/more than the ml, Fe
3+Concentration is at 6～7g/L, and at this moment, the leaching process the first step finishes.
(4) second step of leaching process
For guaranteeing in leaching process, to obtain producing in balance and the leaching process loss of solution iron, in the first step, add the FeS of 3～10g/L in the cultured ripe bacterium liquid owing to adding old circuit board powder causes leach liquor pH to rise
2Concentrate.FeS
2Concentrate reaction below taking place under the effect of bacterium,
The Fe that produces
3+Can replenish source of iron, H
+Rising that can balance pH value.
Then, the old circuit board powder that fragmentation is good joins in the above nutrient solution, and adding concentration is 30～50g/L.Leach reaction in shaking table, extraction time is 3～10 days.
Reaction formula in the leaching process is as follows,
2Fe
3++Cu
0→2Fe
2++Cu
2+
After leaching the reaction end, Al, Cu, Ni, Zn above 90% are leached.
Effect of the present invention is: except helping environmental protection, can also be used to reclaiming the noble metal resource in the old circuit board, balance the old circuit board powder join the rising of the pH value that occurs in the nutrient solution, improved the treatment capacity of bacterium leaching old circuit board, simultaneously also improved leaching efficiency, and made owing to occur deposited phenomenon in the leaching process and cause the Fe that loses to obtain replenishing.
Description of drawings
Fig. 1 is the process flow diagram of an embodiment of the present invention.
As shown in Figure 1,1 is used normal temperature acidophil (the Thiobacillus ferrooxidansRetech-XI of experiment, preservation registration number is CCTCC No:M207159, October 16 2007 preservation day,), it is carried out rejuvenation, the domestication operation 2 of heavy metal is amplified then and is cultivated 3, obtains ripe bacterium liquid 4, it is first step culture of bacteria here that flow process arrives, be the second step leaching process later on, choose old circuit board 5, old circuit board is carried out fragmentation 6,7 is sulphur ore, operation 8 adds old circuit board powder and pyrite in ripe bacterium liquid, the entry-line plate leaches operation 9, and the liquid after leaching is carried out solid-liquid separation process 10, separate the leached mud 11 that obtains, separate the leaching liquid 12 that obtains and reclaim metal operation 13, obtain metal product 14, the remaining Fe that contains2+Carry out bacteriological aftergrowth operation 16 with the tail washings 15 of bacterium, return operation 8 circulating leachings behind the bacteriological aftergrowth.
Embodiment
Below in conjunction with embodiment the present invention is further specified
Embodiment 1
It serves as to leach to handle raw material that this method is applied to the scrap stock that produce in the wiring board production process, and the content of copper is the highest in this kind discarded circuit board, is 25.06%, wherein contains other metal Fe:0.66%, Pb:0.80%.
(1) rejuvenation of normal temperature acidophilic bacteria and domestication are cultivated
Normal temperature acidophilic bacteria (Thiobacillus ferrooxidans Retech-XI, preservation registration number are CCTCCNo:M207159, October 16 2007 preservation day) is carried out bacterial adaptation domestication switching in the pH value is 1.7～2.0 9K nutrient solution cultivate 4 times.Copper content is the highest by 25.06% in this kind wiring board, when bacterium is carried out the heavy metal domestication, and the Cu of adding
2+Concentration is 5～20g/L, and the content of other metal is very low in the wiring board, need not tame, and each bacterial load is 20% of a culture cumulative volume during domestication, 30～35 ℃ of culture temperature.The final rejuvenation bacteria concentration that obtains is greater than 10
7The adaptability domestication low temperature leaching-ore bacteria of individual/ml, anti-Cu
2+Ability is greater than 20g/L, bacterium liquid current potential reach 600 (mv, Vs.SCE).This bacterium liquid can insert and cultivate the leaching of carrying out wiring board then in the nutrient solution.
(2) to old circuit board fragmentation and the amplification culture of carrying out bacterium
The general cutting grinding machine of old circuit board and variable-ratio high speed rotating pulverizer are carried out two-stage pulverize, finally obtain the crushed products of granularity for-0.5mm.Normal temperature acidophilic bacteria (Thiobacillus ferrooxidansRetech-XI) is inoculated into 9K nutrient solution amplification culture 1 time, inoculum size is 10～20% of a culture cumulative volume, in incubator, cultivated 3～4 days, temperature is 30～35 ℃, rotating speed is 150～160rpm, and pH is set at 1.7～2.0.During the redox potential 500～600mv in nutrient solution (Vs.SCE is meant that measured redox potential value is the observed value with respect to standard calomel electrode), the bacterium number is 10 in the nutrient solution
7Individual/more than the ml, Fe
3+Concentration is at 6～7g/L, and at this moment, the leaching process the first step finishes.
(3) leached for second step
The FeS that in the first step, adds 3～10g/L in the cultured leach liquor
2Concentrate.Then that fragmentation is good old circuit board powder joins in the above ripe bacterium liquid, and adding concentration is 30g/L.Leach reaction in shaking table, leaching condition is that temperature is 30～35 ℃, and rotating speed is 150～160rpm, and pH is set at 1.7～2.0.In leaching process, the current potential in the leach liquor can descend, and drops to 300～400mv.After current potential rises to 500mv in the leach liquor, the basic end of second step.To Cu in the leach liquor
2+Carry out analytical calculation and find, have Cu to be leached above 90%.Leach liquor is carried out solid-liquid separation, and solid returns once more and leaches, and improves leaching yield, and liquid carries out the recovery and the bacteriological aftergrowth of metal.
Effect of the present invention is: except being conducive to environmental protection, can also be used to reclaim the precious metal resource in the old circuit board, balance the old circuit board powder join the rising of the pH value that occurs in the nutrient solution, improved the treating capacity of Bioleaching old circuit board, simultaneously also improved leaching efficiency, and made owing to occur deposited phenomenon in the leaching process and cause the Fe that loses to obtain replenishing.
Claims (10)
1. a normal temperature acidophilic acidleach ore deposit bacterium, it is characterized in that: name is called Thiobacillus ferrooxidansRetech-XI, and preservation registration number is CCTCC No:M207159, October 16 2007 preservation day, depositary institution China national typical case culture collection center is in the Wuhan University of address.
2. have a liking for the two step leaching methods that acidleach ore deposit bacterium is leached metal in the old circuit board with normal temperature for one kind, it is characterized in that: it comprises:
(1) normal temperature is had a liking for acidleach ore deposit bacterium, this bacterium preserving number CCTCC No:M207159 cultivates through rejuvenation, domestication, obtains adaptive bacterial classification;
(2) bacterium that adapts to is linked into carries out amplification culture in the 9K nutrient solution and obtain ripe bacterium liquid;
(3) before the leaching, in (2), add sulphur ore in the cultured ripe bacterium liquid;
(4) old circuit board powder that fragmentation is good joins in the ripe bacterium liquid in (3) and leaches;
(5) leach liquor carries out solid-liquid separation and metal recovery.
3. two of old circuit board according to claim 2 go on foot leaching methods, it is characterized in that: described rejuvenation, the domestication culture condition of having a liking for sour normal temperature bacterium (Thiobacillus ferrooxidans Retech-XI) is: add heavy metal ion and carry out bacterial adaptation domestication cultivation in the 9K nutrient solution, amplification culture step by step then, wherein bacterial load is 10～30% of a culture cumulative volume, the kind of domestication heavy metal ion can be selected according to contained heavy metal in the wiring board, and getting bacteria concentration is 10
7～10
9The ore deposit bacterium is soaked in the adaptability domestication of individual/ml, and its growth temperature is at 30～35 ℃, and pH is between 1.7～2.5.
4. two of old circuit board according to claim 2 go on foot leaching methods, it is characterized in that: the adding heavy metal ion is Cu
2+, Zn
2+, Sn
2+, Al
3+, pb
2+, Ni
2+, Ag
+The concentration of heavy metal is made as Cu respectively
2+: 5～20g/L, Zn
2+: 1～3g/L, Sn
2+: 1～3g/L, Al
3+: 1～3g/L, pb
2+: 1～3g/L, Ni
2+: 1～3g/L, Ag
+: 0.005～0.05g/L.
5. according to two step leaching methods of claim 2 or 3 described old circuit boards, it is characterized in that: the switching number of times that described bacterial adaptation domestication is cultivated is 3～6 times.
6. according to two step leaching methods of claim 2 or 3 described old circuit boards, it is characterized in that: described ripe bacterium liquid is amplification culture domestication bacterium in the solution current potential reaches 500～600mV that the bacterium number is 10 in the nutrient solution
7Individual/more than the ml, Fe
3+Concentration is at 6～7g/L.
7. according to two step leaching methods of claim 2 or 3 described old circuit boards, it is characterized in that: describedly in ripe bacterium liquid, add FeS
2The concentration of concentrate is 3～10g/L, adds before leaching.
8. according to two step leaching methods of claim 2 or 3 described old circuit boards, it is characterized in that: the particle diameter of the old circuit board of described fragmentation is less than 0.5mm.
9. according to two step leaching methods of claim 2 or 3 described old circuit boards, it is characterized in that: the described concentration that adds the old circuit board powder in nutrient solution is 30～50g/L.
10. according to two step leaching methods of claim 2 or 3 described old circuit boards, it is characterized in that: after adding the wiring board powder, leaching process proceeds to when the leach liquor current potential reaches the 500mV left and right sides and finishes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102400588A CN101748084B (en) | 2008-12-17 | 2008-12-17 | Normal temperature acidophilic leaching-ore bacteria and two-step leaching method for leaching metals in waste circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008102400588A CN101748084B (en) | 2008-12-17 | 2008-12-17 | Normal temperature acidophilic leaching-ore bacteria and two-step leaching method for leaching metals in waste circuit board |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101748084A true CN101748084A (en) | 2010-06-23 |
| CN101748084B CN101748084B (en) | 2012-07-18 |
Family
ID=42475700
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008102400588A Expired - Fee Related CN101748084B (en) | 2008-12-17 | 2008-12-17 | Normal temperature acidophilic leaching-ore bacteria and two-step leaching method for leaching metals in waste circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101748084B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962712A (en) * | 2010-10-15 | 2011-02-02 | 华南理工大学 | Method for leaching valuable metals in waste circuit board by acidophilic bacteria mixed culture |
| CN102206751A (en) * | 2011-04-29 | 2011-10-05 | 常州纺织服装职业技术学院 | Method for continuously recovering copper from printed circuit boards by microbial metabolites under action of micro electric field |
| CN102443698A (en) * | 2010-10-08 | 2012-05-09 | 北京有色金属研究总院 | Method for controlling pH rise in metal process in microbiological leaching waste circuit board |
| CN103572049A (en) * | 2013-11-19 | 2014-02-12 | 东北大学 | Bacterium agitation leaching method of cobalt concentrate |
| CN103898550A (en) * | 2014-04-14 | 2014-07-02 | 常州纺织服装职业技术学院 | Recovery method of cupper in circuit board |
| CN108130421A (en) * | 2018-01-26 | 2018-06-08 | 宁波华成阀门有限公司 | A kind of manufacturing method of the brass extracted from useless radiator |
| CN114293018A (en) * | 2022-01-12 | 2022-04-08 | 长春黄金研究院有限公司 | Method for recovering various rare and noble metals from waste circuit board |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101191153B (en) * | 2006-11-28 | 2010-05-12 | 北京有色金属研究总院 | Pyrite selectivity inhibition technique for secondary copper sulfide mineral biological lixiviation process |
-
2008
- 2008-12-17 CN CN2008102400588A patent/CN101748084B/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102443698A (en) * | 2010-10-08 | 2012-05-09 | 北京有色金属研究总院 | Method for controlling pH rise in metal process in microbiological leaching waste circuit board |
| CN101962712A (en) * | 2010-10-15 | 2011-02-02 | 华南理工大学 | Method for leaching valuable metals in waste circuit board by acidophilic bacteria mixed culture |
| CN102206751A (en) * | 2011-04-29 | 2011-10-05 | 常州纺织服装职业技术学院 | Method for continuously recovering copper from printed circuit boards by microbial metabolites under action of micro electric field |
| CN102206751B (en) * | 2011-04-29 | 2013-10-02 | 常州纺织服装职业技术学院 | Method for continuously recovering copper from printed circuit boards by microbial metabolites under action of micro electric field |
| CN103572049A (en) * | 2013-11-19 | 2014-02-12 | 东北大学 | Bacterium agitation leaching method of cobalt concentrate |
| CN103572049B (en) * | 2013-11-19 | 2015-07-01 | 东北大学 | Bacterium agitation leaching method of cobalt concentrate |
| CN103898550A (en) * | 2014-04-14 | 2014-07-02 | 常州纺织服装职业技术学院 | Recovery method of cupper in circuit board |
| CN108130421A (en) * | 2018-01-26 | 2018-06-08 | 宁波华成阀门有限公司 | A kind of manufacturing method of the brass extracted from useless radiator |
| CN114293018A (en) * | 2022-01-12 | 2022-04-08 | 长春黄金研究院有限公司 | Method for recovering various rare and noble metals from waste circuit board |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101748084B (en) | 2012-07-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101748084B (en) | Normal temperature acidophilic leaching-ore bacteria and two-step leaching method for leaching metals in waste circuit board | |
| Gomez et al. | Silver-catalysed bioleaching of a chalcopyrite concentrate with mixed cultures of moderately thermophilic microorganisms | |
| Tran et al. | Bacterial cyanide generation in the presence of metal ions (Na+, Mg2+, Fe2+, Pb2+) and gold bioleaching from waste PCBs | |
| CN103993171B (en) | A kind of method of adding nonionogenic tenside promotion chalcopyrite Bioleaching | |
| CN105861823B (en) | A kind of method for strengthening chalcopyrite Microorganism Leaching | |
| CN104862475B (en) | The method of copper in Thiobacillus ferrooxidans leaching discarded printed circuit boards | |
| CN104862474B (en) | A kind of biological extraction regulated and controled altogether based on pH and current potential is containing the method for heavy metal in heavy metal waste | |
| CN105734285B (en) | A kind of method for strengthening zincblende Microorganism Leaching | |
| CN103484680A (en) | Method for leaching copper in waste printed circuit boards (PCBs) by mixed bacteria | |
| CN106947866A (en) | A kind of recoverying and utilizing method of discarded printed circuit boards | |
| CN100362117C (en) | Sulfide ore treatment technology by thermoacidophile | |
| CN105039693B (en) | A kind of bioleaching process for strengthening chalcopyrite and bornite | |
| JP2011047030A (en) | Method of leaching copper sulfide ore | |
| CN101748080A (en) | Ore leaching bacteria and selectivity organism extraction process of low grade zinc sulfide ore | |
| CN102206751B (en) | Method for continuously recovering copper from printed circuit boards by microbial metabolites under action of micro electric field | |
| CN104073639A (en) | Method for recycling copper and gold from waste electronic material through two-step method | |
| CN103572048B (en) | Method of cobalt leaching with activated carbon catalysis bacteria | |
| CN109439586B (en) | Acidophilic iron-oxidizing microorganism, microbial inoculum and application thereof | |
| CN102337228A (en) | Thermoacidophile and low grade chalcopyrite ore microbe stepwise leaching process | |
| CN101638720B (en) | Bacterial leaching copper method of complex chalcopyrite flotation tailings | |
| CN113308605B (en) | Method for strengthening leaching of copper and gold in waste circuit board by phanerochaete chrysosporium by using micro-electric field | |
| CN106929672A (en) | A kind of method that utilization crystal seed induction promotes chalcopyrite Bioleaching except iron | |
| Jadhav et al. | Acetic acid mediated leaching of metals from lead-free solders | |
| CN105255763B (en) | A method of microorganism adhesion effect in enhancing brass mineral biological lixiviation process | |
| CN101736155A (en) | Method for control oxidation of pyrite in bioleaching process |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190624 Address after: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee after: YOUYAN ENGINEERING TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. Address before: 100088, 2, Xinjie street, Beijing Patentee before: General Research Institute for Nonferrous Metals |
|
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210409 Address after: 101407 No.11, Xingke East Street, Yanqi Economic and Technological Development Zone, Huairou District, Beijing Patentee after: Youyan resources and Environment Technology Research Institute (Beijing) Co.,Ltd. Address before: 101407 No. 11 Xingke East Street, Yanqi Economic Development Zone, Huairou District, Beijing Patentee before: YOUYAN ENGINEERING TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120718 Termination date: 20211217 |