CN103304049B - Coking wastewater recycling treatment system and method - Google Patents
Coking wastewater recycling treatment system and method Download PDFInfo
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- CN103304049B CN103304049B CN201210057639.4A CN201210057639A CN103304049B CN 103304049 B CN103304049 B CN 103304049B CN 201210057639 A CN201210057639 A CN 201210057639A CN 103304049 B CN103304049 B CN 103304049B
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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
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Abstract
The invention relates to a coking wastewater recycling treatment system, which is characterized in that: including coagulating basin (1), coagulating basin (1) has connected gradually inclined plate sedimentation tank (2), ultrafiltration device (3), ultrafiltration product water basin (5), first pump body (6), first filter (7), second filter (8), the second pump body (9), nanofiltration device (10), nanofiltration product water basin (11), the third pump body (12), third filter (13), reverse osmosis unit (14) and reverse osmosis product water basin (15) through pipeline (18). Meanwhile, the invention also provides a coking wastewater recycling treatment method. The system has stable treatment effect, low production and operation cost and simple and convenient operation, can treat the effluent of the biochemical sedimentation tank, avoids the physicochemical treatment section after the conventional biochemical treatment, avoids using a large amount of medicaments, reduces the sludge treatment capacity of the system and reduces the operation cost of wastewater treatment.
Description
Technical field
The invention belongs to water treatment field, particularly, relate to a kind of waste water recycling treatment system and method, more specifically, relate to a kind of system for recycling and treating coking wastewater and method.
Background technology
Coking chemical waste water complicated component, containing many organic and inorganic pollutents, as ammonia nitrogen, prussiate, thiocyanate-, phenolic compound, polycyclic aromatic hydrocarbons (PAHs), nitrogen-containing heterocycle compound, fatty compounds etc. containing oxygen or sulfur heterocyclic compound and long-chain.Its phenolic compound massfraction accounts for about 85% of total organic matter, and many COD (chemical oxygen demand (COD)) contribution reaches 80%; Inorganics is based on prussiate, thiocyanate-and ammonia nitrogen.These Pollutant levels are high, strong toxicity, difficult degradation, have carinogenicity, can cause destruction and the impact of persistence on environment and the ecosystem.Therefore, the Treatment for Reuse of coking chemical waste water, has become the technology focus of industry.
Waste water recycling is the enforcement means that industry energy conservation reduces discharging.The Recycle Technology of Waste Water implemented at present is simplified partially, as steel industry mostly take pre-treatment and biochemical treatment after to deliver coal a coal powder injection, steel-making dedusting and coke oven quenching etc., pollute thing transfer, also may affect the quality of steel products.
" the coking industry entry criteria " that play enforcement according on January 1st, 2009 builds requirement to coke oven: the newly-built coke oven of iron and steel enterprise wants synchronous auxiliary construction dry coke quenching auxiliary and the corresponding cleaning apparatus of auxiliary construction.Wet quenching technique will progressively be replaced by dry quenching(of coke), and coking waste water reuse also cannot be implemented to coke oven quenching.Meanwhile, " coking chemical waste water qualified discharge and reuse technology " is listed in by country " national major technologies and equipment develops and great industrial technology researches and develops ad hoc planning ", this further illustrates the urgency of waste water recycling.
Domestic coking wastewater containing phenol and cyanide reuse is in the exploratory stage at present, and Ge Jia enterprise verifies the technology of waste water recycling haplotype and analyzes do a lot, system, all sidedly analysis and research and industrial applications then little.As patent documentation 200710068327.2, bio-chemical effluent is adopted to prepare process water through oxidizing, flocculating+air supporting+cation and anion exchange+reverse osmosis; Patent documentation 200810022437.X, adopts the former water of coking chemical waste water after oil removal treatment through multi-medium filtering+security personnel's filtration+first-stage reverse osmosis+two-pass reverse osmosis; All belong to comparatively detailed to coking waste water reuse research in recent years but do not carry out the example of practical application.
Therefore, strengthen the research dynamics to coking waste water reuse, formulate pointed processing scheme, explore for the strategy of coking waste water reuse and technology and be applied to industrial production, to realizing the sustainable development of enterprise and energy-saving and emission-reduction, raising synthesized competitiveness is significant.
Summary of the invention
For solving the technical problem of above-mentioned existence, the object of the present invention is to provide a kind of system for recycling and treating coking wastewater and method, described system treatment effect is stable, production run cost is low, operation runs easy, process can adopt biochemical sedimentation basin water outlet, avoid the materializing strategy section after routine biochemistry process, avoid making with medicament in a large number, reduce system sludge treatment capacity, reduce wastewater treatment running cost.
For achieving the above object, the present invention adopts following technical scheme:
A kind of system for recycling and treating coking wastewater, it is characterized in that: comprise coagulation basin, described coagulation basin is connected with inclined-plate clarifying basin, ultra-filtration equipment, ultrafiltration product pond, first pump housing, the first strainer, the second strainer, second pump housing, nanofiltration device, nanofiltration product pond, the 3rd pump housing, the 3rd strainer, reverse osmosis unit and reverse osmosis produced pond in turn by pipeline.
According to a kind of system for recycling and treating coking wastewater provided by the present invention, what adopt is, described ultrafiltration is produced between pond and ultra-filtration equipment and is also connected with the 4th pump housing by pipeline, described nanofiltration device one end is also connected with the first reclamation set by pipeline, and described reverse osmosis unit one end is also connected with the second reclamation set by pipeline.
According to a kind of system for recycling and treating coking wastewater provided by the present invention, employing, described ultra-filtration equipment one end is connected with the entrance end of coagulation basin by pipeline, and described ultra-filtration equipment adopts seven apertures in the human head ultra-filtration membrane, and operating pressure is 2.0 ~ 3.5MPa.
According to a kind of system for recycling and treating coking wastewater provided by the present invention, employing, described first strainer is more medium filter, and described more medium filter comprises 3 metafiltration material: coarse sand bed course, fine sand filtering layer, hard coal filtering layer.
According to a kind of system for recycling and treating coking wastewater provided by the present invention, adopt, described second strainer and the 3rd strainer are cartridge filter, and described cartridge filter adopts stainless steel, inside establish conical spring fixed sturcture and replaceable cassette filter core, filtering accuracy is 3 ~ 8 μm.
According to a kind of system for recycling and treating coking wastewater provided by the present invention, employing, described second pump housing and the 3rd pump housing are high-pressure pump, and described high-pressure pump adopts stainless steel, and described high pressure pump outlet pressure is 0.5 ~ 1.2MPa.
According to a kind of system for recycling and treating coking wastewater provided by the present invention, employing, described nanofiltration device adopts pollution-resistant membrane, and putamina adopts glass steel material, and membrane module designs desalination rate is 30% ~ 70%, operating temperature 20 DEG C ~ 30 DEG C; Described reverse osmosis unit adopts low stain reverse osmosis membrane, and putamina adopts glass steel material, membrane module designs desalination rate 95% ~ 99%, operating temperature 20 DEG C ~ 30 DEG C, operating pressure≤2.1MPa.
According to a kind of system for recycling and treating coking wastewater provided by the present invention, what adopt is, whipping appts is provided with in described coagulation basin, described retention time of sewage is 55 ~ 65min, described sloping plate deposition tank main body is that steel construction adds rotproofing, swash plate material is Propylene polymerization material, and the requirement of its effluent quality is: pH=7 ~ 9, CODcr≤150mg/l, SS≤20mg/l, turbidity≤1.0NTU, TN≤120mg/l.
Simultaneously, the present invention also provides one to utilize described system for recycling and treating coking wastewater to carry out coking waste water reuse treatment method, for processing the coking chemical waste water after biochemical treatment, it is characterized in that, comprise the steps: (S1), the coking chemical waste water after biochemical treatment is delivered to coagulation basin, enter inclined-plate clarifying basin afterwards and carry out solid-liquid separation, then ultra-filtration equipment is delivered in water outlet to process, water after uf processing is delivered to ultrafiltration and produce pond, ultrafiltration produced water by first pump housing and deliver to the first strainer and filter;
(S2), the second strainer is sent in the water outlet after filtering in step (S1) filter, the second strainer water outlet is sent into nanofiltration device by second pump housing, the dense water in nanofiltration device is delivered to the first reclamation set and carries out sintering processes;
(S3), nanofiltration is sent in the water outlet after nanofiltration device process and produce pond, after the 3rd pump housing feeding the 3rd strainer filters, enter reverse osmosis unit to process, dense water in reverse osmosis unit is delivered to the second retrieving arrangement and carries out evaporation process, then by the extremely reverse osmosis produced pond of the effluent collection after process, reuse, to industrial water spot, completes the recycling of described coking chemical waste water.
According to a kind of coking waste water reuse treatment method provided by the present invention, employing, in described step (S1), ultrafiltration is produced pond and is carried out backwash operation by the 4th pump housing to ultra-filtration equipment; In described step (S3), the residence time that water outlet is produced in pond in nanofiltration is 1 ~ 2 hour, and the residence time of water outlet in reverse osmosis produced pond is 1 ~ 4 hour.
The beneficial effect of a kind of system for recycling and treating coking wastewater provided by the present invention and method is:
Avoid the materializing strategy section after routine biochemistry process, avoid making with medicament in a large number, reduce system sludge treatment capacity, reduce wastewater treatment running cost, can be substituted above-mentioned flow process by coagulation basin, swash plate one-tenth and ultrafiltration, suitably can reduce the COD in waste water
cr, can not say that follow-up system brought into by suspended substance and colloid, and use nanofiltration can effectively to COD in waste water simultaneously
crremove, ensure reverse osmosis membrane influent COD
crat below 30mg/L, ensure that the work-ing life of film, adopt multiple stage filtration system simultaneously, treatment effect is stablized, and production run cost is lower, and operation runs easy.
Accompanying drawing explanation
Fig. 1 is the connection diagram of a kind of system for recycling and treating coking wastewater provided by the present invention.
Fig. 2 is reverse osmosis principle of work schematic diagram.
In figure, 1, coagulation basin 2, inclined-plate clarifying basin 3, ultra-filtration equipment 4, the 4th pump housing 5, ultrafiltration produce pond 6, first pump housing 7, first strainer 8, second strainer 9, second pump housing 10, pond 12, the 3rd pump housing 13, the 3rd strainer 14, reverse osmosis unit 15, reverse osmosis produced pond 16, first reclamation set 17, second reclamation set 18, pipeline are produced in nanofiltration device 11, nanofiltration.
Embodiment
Below in conjunction with accompanying drawing, a kind of system for recycling and treating coking wastewater provided by the present invention and method are further explained.
The mode of connection of a kind of system for recycling and treating coking wastewater provided by the present invention is as follows: as shown in Figure 1, coagulation basin 1 is connected with inclined-plate clarifying basin 2 in turn by pipeline 18, ultra-filtration equipment 3, is produced from pond 5 in ultrafiltration, first pump housing 6, first strainer 7, second strainer 8, second pump housing 9, nanofiltration device 10, is produced from pond 11 in nanofiltration, 3rd pump housing 12, 3rd strainer 13, reverse osmosis unit 14 and reverse osmosis produced pond 15, described ultra-filtration equipment 3 one end is connected with the entrance end of coagulation basin 1 by pipeline 18, described ultrafiltration is produced between pond 5 and ultra-filtration equipment 3 and is also connected with the 4th pump housing 4 by pipeline 18, described nanofiltration device 10 one end is also connected with the first reclamation set 16 by pipeline 18, described reverse osmosis unit 14 one end is also connected with the second reclamation set 17 by pipeline 18.
A kind of coking waste water reuse treatment method concrete steps provided by the present invention are as follows:
(S1), coking chemical waste water after biochemical treatment is delivered to coagulation basin 1, enter inclined-plate clarifying basin 2 afterwards and carry out solid-liquid separation, the organic concentration being difficult in waste water degrade is reduced further, then water outlet is delivered to ultra-filtration equipment 3 to process, water after uf processing is delivered to ultrafiltration and produce pond 5, ultrafiltration produces pond 5 as backwash water source, timing is carried out by the 4th pump housing 4 pairs of ultra-filtration equipment 3, level pressure backwash operation, ultrafiltration produced water by first pump housing 6 to deliver to the first strainer 7 and filter, object is in the first strainer 7, reduce the turbidity in waste water and partial organic substances, the concentration of free chlorine, remove peculiar smell in water, colourity and stink, prevent the pollution of follow-up reverse osmosis membrane.
Wherein, be provided with whipping appts in described coagulation basin 1, the residence time of described waste water in coagulation basin 1 is 55 ~ 65min.Described inclined-plate clarifying basin 2 main body is that steel construction adds rotproofing, and swash plate material is Propylene polymerization material, and the requirement of its effluent quality is: pH=7 ~ 9, CODcr≤150mg/l, SS≤20mg/l, turbidity≤1.0NTU, TN≤120mg/l.Described ultra-filtration equipment 3 adopts seven apertures in the human head ultra-filtration membrane, and operating pressure is 2.0 ~ 3.5MPa.Described first strainer 7 is more medium filter, and described more medium filter comprises 3 metafiltration material: coarse sand bed course, fine sand filtering layer, hard coal filtering layer.
The effect of described coagulation basin 1 is to carry out coagulating kinetics to bio-chemical effluent dosing coagulant, reduces the pollutents such as the COD in waste water.The effect of described inclined-plate clarifying basin 2 is to carry out settlement separate in inclined-plate clarifying basin to the flco produced in coagulation process.
1. (S2), the second strainer 8 sent in the water outlet after filtering in step (S1) filter, second strainer 8 water outlet is sent into nanofiltration device 10 by second pump housing 9, the dense water in nanofiltration device 10 is delivered to the first reclamation set 16 and carry out sintering processes.The reason that dense water (referring to the waste water, sewage and the waste liquid that produce in Industrial processes) carries out sintering processes is: dense Organic substance in water concentration is herein higher and corrosive ion concentration is lower herein, therefore can be used for the process of sintering spice, utilize the organism in the dense water of high temperature incineration of sintering.
(S3), water outlet after nanofiltration device 10 being processed is sent into nanofiltration and is produced pond 11, the residence time that described water outlet is produced in pond 11 in nanofiltration is 1 ~ 2 hour, send into after the 3rd strainer 13 filters through the 3rd pump housing 12, enter reverse osmosis unit 14 to process, dense water in reverse osmosis unit 14 is delivered to the second retrieving arrangement 17 to carry out evaporation process and (be the reason that dense water carries out evaporation process: in dense water, corrosive ion is more and organic concentration is lower herein, therefore can reuse to Steel Plant's blast furnace slag flushing, with utilizing high temperature open-air atmosphere alive to be evaporated in stock yard watering etc. operation), then by the extremely reverse osmosis produced pond 15 of the effluent collection after process, the residence time of water outlet in reverse osmosis produced pond 15 is after 1 ~ 4 hour, reuse is to industrial water spot, complete the recycling of described coking chemical waste water.
Described second strainer 8 and the 3rd strainer 13 are cartridge filter, and described cartridge filter adopts stainless steel, and inside establish conical spring fixed sturcture and replaceable cassette filter core, filtering accuracy is 3 ~ 8 μm.Described second pump housing 9 and the 3rd pump housing 12 are high-pressure pump, described high-pressure pump adopts stainless steel, adopt variable frequency control, described high pressure pump outlet pressure is 0.5 ~ 1.2MPa, the chain control of product water ga(u)ge in pond 11 is produced in described second pump housing 9 and nanofiltration, the chain control of product water ga(u)ge in described 3rd pump housing 12 and reverse osmosis produced pond 15.
Described nanofiltration device 10 adopts pollution-resistant membrane, and putamina adopts glass steel material, and membrane module designs desalination rate is 30% ~ 70%, operating temperature 20 DEG C ~ 30 DEG C, and nanofiltration adopts one-level two sections combination, arrangement mode 2: 1.Described reverse osmosis unit 14 adopts low stain reverse osmosis membrane, and putamina adopts glass steel material, membrane module designs desalination rate 95% ~ 99%, operating temperature 20 DEG C ~ 30 DEG C, operating pressure≤2.1MPa.
The effect of described ultra-filtration equipment 3 is to remove the suspended substance in water body further, ensures SDI≤5 before nanofiltration.Described SDI and pollution index (Silting Density Index is called for short SDI) value.
The effect of described nanofiltration device 10 is to remove the COD in water body
cr, ensure into reverse osmosis water quality, reduce reverse osmosis burden.
The effect of reverse osmosis unit 14 is to remove materials such as solubility salts in waste water, makes to produce water and reaches effluent-quality standards.
Wherein, it is impellent that nanofiltration refers to pressure difference, and in the trap water between reverse osmosis and ultrafiltration, particle diameter is a kind of membrane separation technique of nano-scale particle thing.
Reverse osmosis membrane principle (as shown in Figure 2): reverse osmosis membrane with certain pressure, the solvent in solution is separated.Because it is contrary with the direction of naturally osmotic, therefore claims reverse osmosis.According to the different osmotic of various material, the reverse osmosis method being greater than osmotic pressure just can be made to reach separation, extraction, purifying and concentrated object.Thus by realizing carrying out subsequent disposal by NF concentrated water reuse to the second retrieving arrangement 17 in reverse osmosis unit 14.
Cartridge filter is also called accurate filter, before being generally arranged on pressurized vessel, to remove the fine particles of turbidity more than 1 degree, meets the requirement of subsequent handling to water inlet; Sometimes be also arranged on the end of whole water treatment system, prevent fine particles (resin as fragmentation) from entering finished product water.
Seven apertures in the human head ultra-filtration membrane is the one of hollow fiber ultrafiltration membrane, and mainly for improving, film silk intensity develops, and film silk cross section is similar to cellular, has seven holes.
After adopting a kind of system for recycling and treating coking wastewater provided by the present invention and method, coking chemical waste water before treatment after water quality contrast as shown in the table:
Claims (8)
1. a system for recycling and treating coking wastewater, it is characterized in that: comprise coagulation basin (1), described coagulation basin (1) is connected with inclined-plate clarifying basin (2) in turn by pipeline (18), is produced from pond (5) in ultra-filtration equipment (3), ultrafiltration, first pump housing (6), the first strainer (7), the second strainer (8), second pump housing (9), nanofiltration device (10), nanofiltration produce pond (11), the 3rd pump housing (12), the 3rd strainer (13), reverse osmosis unit (14) and reverse osmosis produced pond (15);
Described ultrafiltration is produced between pond (5) and ultra-filtration equipment (3) and is also connected with the 4th pump housing (4) by pipeline (18), described nanofiltration device (10) one end is also connected with the first reclamation set (16) by pipeline (18), and described reverse osmosis unit (14) one end is also connected with the second reclamation set (17) by pipeline (18);
Described nanofiltration device (10) adopts pollution-resistant membrane, and putamina adopts glass steel material, and membrane module designs desalination rate is 30% ~ 70%, operating temperature 20 DEG C ~ 30 DEG C; Described reverse osmosis unit (14) adopts low stain reverse osmosis membrane, and putamina adopts glass steel material, membrane module designs desalination rate 95% ~ 99%, operating temperature 20 DEG C ~ 30 DEG C, operating pressure≤2.1MPa.
2. a kind of system for recycling and treating coking wastewater according to claim 1, it is characterized in that: described ultra-filtration equipment (3) one end is connected with the entrance end of coagulation basin (1) by pipeline (18), described ultra-filtration equipment (3) adopts seven apertures in the human head ultra-filtration membrane, and operating pressure is 2.0 ~ 3.5MPa.
3. a kind of system for recycling and treating coking wastewater according to claim 1, it is characterized in that: described first strainer (7) is more medium filter, and described more medium filter comprises 3 metafiltration material: coarse sand bed course, fine sand filtering layer, hard coal filtering layer.
4. a kind of system for recycling and treating coking wastewater according to claim 1, it is characterized in that: described second strainer (8) and the 3rd strainer (13) are cartridge filter, described cartridge filter adopts stainless steel, inside establish conical spring fixed sturcture and replaceable cassette filter core, filtering accuracy is 3 ~ 8 μm.
5. a kind of system for recycling and treating coking wastewater according to claim 1, it is characterized in that: described second pump housing (9) and the 3rd pump housing (12) are high-pressure pump, described high-pressure pump adopts stainless steel, and described high pressure pump outlet pressure is 0.5 ~ 1.2MPa.
6. a kind of system for recycling and treating coking wastewater according to claim 1, it is characterized in that: described coagulation basin is provided with whipping appts in (1), described retention time of sewage is 55 ~ 65min, described inclined-plate clarifying basin (2) main body is that steel construction adds rotproofing, swash plate material is Propylene polymerization material, its effluent quality requires: pH=7 ~ 9, CODcr≤150mg/l, SS≤20mg/l, turbidity≤1.0NTU, TN≤120mg/l.
7. utilize the system for recycling and treating coking wastewater described in claim 1 to carry out a coking waste water reuse treatment method, for processing the coking chemical waste water after biochemical treatment, it is characterized in that, comprising the steps:
(S1), the coking chemical waste water after biochemical treatment is delivered to coagulation basin (1), enter inclined-plate clarifying basin (2) afterwards and carry out solid-liquid separation, then water outlet is delivered to ultra-filtration equipment (3) to process, water after uf processing is delivered to ultrafiltration and produce pond (5), ultrafiltration produced water by first pump housing (6) and deliver to the first strainer (7) and filter;
(S2), the second strainer (8) is sent in the water outlet after filtration in step (S1) to filter, second strainer (8) water outlet is sent into nanofiltration device (10) by second pump housing (9), the dense water in nanofiltration device (10) is delivered to the first reclamation set (16) and carries out sintering processes;
(S3) water outlet after, nanofiltration device (10) being processed is sent into nanofiltration and is produced pond (11), after the 3rd pump housing (12) feeding the 3rd strainer (13) filters, enter reverse osmosis unit (14) to process, dense water in reverse osmosis unit (14) is delivered to the second retrieving arrangement (17) and carries out evaporation process, then by the extremely reverse osmosis produced pond (15) of the effluent collection after process, reuse, to industrial water spot, completes the recycling of described coking chemical waste water.
8. a kind of coking waste water reuse treatment method according to claim 7, it is characterized in that: in described step (S1), ultrafiltration is produced pond (5) and is carried out backwash operation by the 4th pump housing (4) to ultra-filtration equipment (3); In described step (S3), water outlet is 1 ~ 2 hour in the nanofiltration residence time of producing in pond (11), and the residence time of water outlet in reverse osmosis produced pond (15) is 1 ~ 4 hour.
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| CN102784911B (en) * | 2012-08-08 | 2015-02-25 | 河南省中原内配股份有限公司 | Cleaning machine for cleaning efficient liner blank coating |
| CN103496800A (en) * | 2013-10-10 | 2014-01-08 | 浙江汉蓝环境科技有限公司 | Method for deeply treating high-concentration nitrogen-containing chemical wastewater |
| CN103936184A (en) * | 2014-05-13 | 2014-07-23 | 株洲冶炼集团股份有限公司 | Novel heavy metal wastewater recycle linkage device |
| CN104445774B (en) * | 2014-11-24 | 2017-02-22 | 神华集团有限责任公司 | Wastewater treating device and method |
| CN104909496A (en) * | 2015-06-01 | 2015-09-16 | 上海晶宇环境工程有限公司 | Gasification grey water on-line recycling treatment technique and special device thereof |
| CN105502791B (en) * | 2016-01-21 | 2018-08-07 | 厦门嘉戎技术股份有限公司 | A kind of coal chemical industrial waste water salinity extracting method and equipment |
| CN109626638A (en) * | 2018-12-24 | 2019-04-16 | 湖北兴发环保科技有限公司 | A kind for the treatment of process of high P content waste water Zero-discharge reuse |
| CN112408692A (en) * | 2019-08-20 | 2021-02-26 | 宝武炭材料科技有限公司 | Coking wastewater pre-membrane treatment salt-separation zero-discharge process |
| CN117003422A (en) * | 2023-08-03 | 2023-11-07 | 北京赛诺膜技术有限公司 | Resource treatment process applicable to pea protein whey wastewater |
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| CN102167477B (en) * | 2011-03-17 | 2012-07-04 | 开滦（集团）有限责任公司 | Recycle system and recycle method of coked wastewater |
| CN201999818U (en) * | 2011-03-25 | 2011-10-05 | 北京能泰高科环保技术有限公司 | Coking wastewater ultrafiltration-nanofiltration combination treatment system |
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| CP01 | Change in the name or title of a patent holder |
Address after: 200942 three chemical engineering office building, Baoshan Iron and steel factory, Shanghai, Baoshan District Patentee after: Baowu Carbon Technology Co.,Ltd. Address before: 200942 three chemical engineering office building, Baoshan Iron and steel factory, Shanghai, Baoshan District Patentee before: BAOWU CARBON MATERIAL TECHNOLOGY Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |