CN106498152A - A kind of limonite super thick bed of material sintering method using pre-sintering - Google Patents
A kind of limonite super thick bed of material sintering method using pre-sintering Download PDFInfo
- Publication number
- CN106498152A CN106498152A CN201610815344.7A CN201610815344A CN106498152A CN 106498152 A CN106498152 A CN 106498152A CN 201610815344 A CN201610815344 A CN 201610815344A CN 106498152 A CN106498152 A CN 106498152A
- Authority
- CN
- China
- Prior art keywords
- sintering
- cloth
- limonite
- bed
- sintered
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/22—Sintering; Agglomerating in other sintering apparatus
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The present invention discloses a kind of using pre-sintered limonite super thick bed of material sintering method.Full limonite sintering is adopted in ground floor cloth, basicity is 2.25 2.35 high alkalinity, on the one hand the content of high intensity calcium ferrite is improve, on the other hand in sintering, amount of liquid phase increases, the a large amount of holes produced during limonite sintering are filled up, make limonite densified, after repaving the second layered material simultaneously, insulation and binder effect are served to underlying material to a certain extent, the sintering deposit of bottom is made to have sufficient time and temperature-curable crystallization, also reduce the extremely cold impact to sinter strength during full limonite sintering, the full limonite sintering of the ground floor that makes from the impact of above pre-sintering process feature is possibly realized.And the compound of second layer iron ore concentrate and limonite, two kinds of iron ore raw materials of the different physical and chemical performances for making achieve characteristic complementation, so as to improve sintering technology index.
Description
Technical field
The present invention relates to the sintering production method of iron ore, especially relates to a kind of using pre-sintered limonite super thick
Bed of material sintering production method.
Background technology
Limonite is a kind of important iron ore material of ironmaking, but contains the higher crystallization water, coarse size, heap ratio due to which
Weight is little, needs to consume substantial amounts of fuel when sintering is used.Simultaneously as which assimilates, temperature is low, and porosity is high, in production application
When, easily cross at high temperature and melt, make the hot gas permeability of sinter bed be deteriorated, cause productivity of sinter to decline, under cold strength
Drop, limit limonite in SINTERING PRODUCTION with addition of ratio.At present, in existing report, limonite really should in production
60% is not had more than with addition of ratio.
In current limonite sintering production, in order to improve the productivity ratio and sintering index of limonite, existing main
Method is：1st, with addition of the bigger water yield；2nd, high alkalinity, high-carbon quantity are sintered；3rd, binder；4th, thickness of feed layer is improved.With addition of bigger
The water yield, can improve yield rate to a certain extent, but continue to increase with rate of water added, burnup can be caused to increase, burning velocity
Accelerate, quantity of return mines increases, productivity ratio declines；Due to the country, generally carry out is high-basicity sintering, excessively improves mixed carbon comtent not
Productivity ratio yield rate can be effectively improved, the bed of material can be made on the contrary to superfuse, make gas permeability be deteriorated；Binder is to improve limonite consumption, carries
Large-duty effective way, but binder limitation, if binder degree is too big, can make the gas permeability of the bed of material be deteriorated again,
Reduce productivity ratio on the contrary；It is to improve the effective ways of limonite sintering productivity ratio to improve thickness of feed layer.
But under conditions of sintering area is constant, the thickness of feed layer of sintering machine is nor unrestrictedly can improve, which is received
The many factors such as equipment scale, air exhauster ability, material condition, sinter quality are restricted.Once there are some researches show both at home and abroad, only leaned on
The thickness of feed layer of simple raising sinter mixture, and corresponding technological measure is not taken, reach to a certain degree in thickness of feed layer
Afterwards, the production capacity and quality of sintering machine all drastically can decline, and lose more than gain.So, current sintering material layer thickness is being adopted both at home and abroad
Take under various technical measures, generally also only in 800mm or so, and global metallurgy is sintered into more than the 900mm super thick bed of materials
A difficult problem.
Content of the invention
The technical problem to be solved is to provide a kind of limonite super thick bed of material sintering method using pre-sintering,
The difficult point that limonite production is overcome well using brand-new pre-sintering process characteristic, breaches due to special cold and hot state property
The bottleneck of vast scale application can be difficult to, with important economic worth and extensive generalization.
The present invention seeks to realized by techniques below scheme：
A kind of limonite super thick bed of material sintering method using pre-sintering, it is characterised in that on sintering belt type roasting machine
It is configured with first and second mixing distributing device and No. first and second igniter；Whole SINTERING PRODUCTION adopts a set of exhausting system；Advanced
Capable cloth first, after bed material distributing device grate-layer material, then by mixture distributor device cloth sinter mixture, igniting is sintered,
After pre-sintering, second cloth sinter mixture is carried out in cloth layer surface first, sintering suction pressure keeps constant, to second
Bed of cloth carries out igniting sintering, and when second bed of cloth completes to light a fire, the compound of bed of cloth is sintered first, is burning
At knot machine tail, bed of cloth and second bed of cloth are complete sintering first；Compound for cloth first arranges dispensing, mixes
Close and granulating system, be that the compound of second cloth arranges dispensing, mixing and granulating system, first during cloth, sintered compound
In material, iron-bearing material is 100% limonite, and in 2.25-2.35, moisture weight percentage is 7.7%-8.5% to basicity, the bed of material
The height chassis baffle plate high with 600-900mm is flushed, and firing temperature is controlled at 900 DEG C -1050 DEG C, after pre-sintered 4-20min,
Using trapezoidal cloth method, more than chassis baffle plate, carry out second cloth again, in the sinter mixture of second cloth, iron content is former
Expect in the magnetite concentrate or hematite concentrates of limonite and 60%-100% for 0-40% one or two, basicity is in 1.70-
1.95, moisture weight percentage is 7.2%-7.6%, and in 200mm-350mm, firing temperature control is 1100 for fabric thickness control
℃-1250℃；In total sinter mixture, it is 60%-90% that limonite accounts for the percentage by weight of total iron charge；Compound total alkali
Degree is in 2.0-2.25.
Staflux is lime stone, quick lime, magnesite.
Bed of cloth thickness and second bed of cloth thickness sum >=900mm first；Sintering machine operation in whole sintering process
Speed is 1.5m/min-2.5m/min, sinters suction pressure >=7000pa.
The present invention adopts full limonite sintering, basicity to be the high alkalinity of 2.25-2.35, on the one hand carry in ground floor cloth
The high content of high intensity calcium ferrite, on the other hand in sintering, amount of liquid phase increases, and has filled up produce during limonite sintering big
Metering-orifice hole, makes limonite densified, while after repaving the second layered material, serving insulation to underlying material to a certain extent and binder being made
With, make the sintering deposit of bottom have sufficient time and temperature-curable crystallization, extremely cold to sintering when also reducing full limonite sintering
The impact of ore deposit intensity, the full limonite sintering of the ground floor made from the impact of above pre-sintering process feature are possibly realized.And second
Layer iron ore concentrate and the compound of limonite, two kinds of iron ore raw materials of the different physical and chemical performances for making achieve characteristic complementation, from
And improve sintering technology index.When above technical measures effectively raise sintering limonite with addition of ratio, overcome
A variety of difficulties during limonite sintering, change traditional limonite sintering pattern, with higher economic worth.
Figure of description
Fig. 1 is super thick bed of material sintering method process chart of the present invention using pre-sintering；
Wherein 1 mixture distributor device a, 2 is igniter a, and 3 are bed of cloth first, and 4 is mixture distributor device b, and 5 are igniting
Device b, 6 is second bed of cloth.
Specific embodiment
Illustrate with reference to specific embodiment：
Embodiment 1：
Concrete technology flow process such as Fig. 1 of the present invention, in a 360m2, on the high 700mm sintering machines of trolley breast plate, carry out pre-
When sintering process is produced, by the dispensing arranged for cloth first, mixing and granulating system, by 100% limonite and part
Coke powder, lime stone, quick lime and magnesite carry out dispensing and mixed once, secondary granulation, before cloth, sintering deposit compound
2.25, moisture weight percentage composition is 7.7% for basicity control.Cloth first and igniting are carried out by distributing device 1 and igniter 2
When, bed depth is flushed with chassis baffle plate, and firing temperature is at 900 DEG C.
While lower floor's compound dispensing, mixing and granulation, 100% magnetite concentrate is carried out dispensing mixing and system
Grain, before second cloth, 1.7, moisture weight percentage composition is 7.2% for the basicity of sinter mixture.Mixed in bottom sintering
After closing 3 pre-sintering 5min of the bed of material, second cloth and igniting are carried out by distributing device 4 and igniter 5,6 is second bed of cloth,
Fabric thickness is 200mm, and firing temperature is at 1100 DEG C.
2.10, limonite accounts for iron charge 72% with addition of ratio to the total alkalinity of sinter mixture.
Main sintering index such as table 1
Known by table 1, when limonite is 72% with addition of ratio, using the present invention, the yield rate of sintering deposit reaches
66.1%, drum strength has reached 78.2% and has all fully met production requirement of the blast furnace to sintering deposit, while low temperature reduction degradation
Index has also reached 75.3%, and metallurgical performance index is excellent.The present invention is not being adopted, under same conditions of mixture ratios, there are no
Industrial production is reported.
Embodiment 2：
Concrete technology flow process such as Fig. 1 of the present invention, in a 360m2, on the high 800mm sintering machines of trolley breast plate, carry out pre-
When sintering process is produced, by the dispensing arranged for cloth first, mixing and granulating system, by 100% limonite and part
Coke powder, lime stone, quick lime and magnesite carry out dispensing and mixed once, secondary granulation, before cloth, sintering deposit compound
2.3, moisture weight percentage composition is 8.0% for basicity control.Cloth first and igniting are carried out by distributing device 1 and igniter 2
When, bed depth is flushed with chassis baffle plate, and firing temperature is at 1000 DEG C.
While lower floor's compound dispensing, mixing and granulation, the hematite concentrates of 20% limonite and 80% are carried out
Dispensing mixing and granulation, before second cloth, 1.8, moisture weight percentage composition exists the basicity of sinter mixture
7.3%.After 3 pre-sintering 10min of the bottom sintered compound bed of material, second cloth and point are carried out by distributing device 4 and igniter 5
Fire, 6 is second bed of cloth, and fabric thickness is 250mm, and firing temperature is at 1150 DEG C.
2.17, limonite accounts for iron charge 78% with addition of ratio to the total alkalinity of sinter mixture.
Main sintering index such as table 2
Known by table 2, when limonite is 78% with addition of ratio, using the present invention, the yield rate of sintering deposit reaches
65.8%, drum strength has reached 78.0% and has all fully met production requirement of the blast furnace to sintering deposit, while low temperature reduction degradation
Index has also reached 75.0%, and metallurgical performance index is excellent.The present invention is not being adopted, under same conditions of mixture ratios, there are no
Industrial production is reported.
Embodiment 3：
Concrete technology flow process such as Fig. 1 of the present invention, in a 360m2, on the high 700mm sintering machines of trolley breast plate, carry out pre-
When sintering process is produced, by the dispensing arranged for cloth first, mixing and granulating system, by 100% limonite and part
Coke powder, lime stone, quick lime and magnesite carry out dispensing and mixed once, secondary granulation, before cloth, sintering deposit compound
2.35, moisture weight percentage composition is 8.5% for basicity control.Cloth first and igniting are carried out by distributing device 1 and igniter 2
When, bed depth is flushed with chassis baffle plate, and firing temperature is at 1050 DEG C.
While lower floor's compound dispensing, mixing and granulation, the magnetite concentrate of 35% limonite and 65% is carried out
Dispensing mixing and granulation, before second cloth, 1.9, moisture weight percentage composition exists the basicity of sinter mixture
7.4%.After 3 pre-sintering 15min of the bottom sintered compound bed of material, second cloth and point are carried out by distributing device 4 and igniter 5
Fire, 6 is second bed of cloth, and fabric thickness is 350mm, and firing temperature is at 1200 DEG C.
2.21, limonite accounts for iron charge 75% with addition of ratio to the total alkalinity of sinter mixture.
Main sintering index such as table 3
Known by table 3, when limonite is 75% with addition of ratio, using the present invention, the yield rate of sintering deposit reaches
66.3%, drum strength has reached 78.5% and has all fully met production requirement of the blast furnace to sintering deposit, while low temperature reduction degradation
Index has also reached 75.7%, and metallurgical performance index is excellent.The present invention is not being adopted, under same conditions of mixture ratios, there are no
Industrial production is reported.
Embodiment 4：
Concrete technology flow process such as Fig. 1 of the present invention, in a 360m2, on the high 750mm sintering machines of trolley breast plate, carry out pre-
When sintering process is produced, by the dispensing arranged for cloth first, mixing and granulating system, by 100% limonite and part
Coke powder, lime stone, quick lime and magnesite carry out dispensing and mixed once, secondary granulation, before cloth, sintering deposit compound
2.35, moisture weight percentage composition is 8.0% for basicity control.Cloth first and igniting are carried out by distributing device 1 and igniter 2
When, bed depth is flushed with chassis baffle plate, and firing temperature is at 1050 DEG C.
While lower floor's compound dispensing, mixing and granulation, the magnetite concentrate of 40% limonite and 60% is carried out
Dispensing mixing and granulation, before second cloth, 1.95, moisture weight percentage composition exists the basicity of sinter mixture
7.6%.After 3 pre-sintering 20min of the bottom sintered compound bed of material, second cloth and point are carried out by distributing device 4 and igniter 5
Fire, 6 is second bed of cloth, and fabric thickness is 200mm, and firing temperature is at 1250 DEG C.
By the calculating to all raw materials of whole feed proportioning system, 2.25, limonite is matched somebody with somebody for the total alkalinity of sinter mixture
Plus ratio accounts for iron charge 87%.
Main sintering index such as table 4
Known by table 4, when limonite is 87% with addition of ratio, using the present invention, the yield rate of sintering deposit reaches
66.1%, drum strength has reached 78.6% and has all fully met production requirement of the blast furnace to sintering deposit, while low temperature reduction degradation
Index has also reached 75.2%, and metallurgical performance index is excellent.The present invention is not being adopted, under same conditions of mixture ratios, there are no
Industrial production is reported.
Claims (3)
1. a kind of using pre-sintered limonite super thick bed of material sintering method, it is characterised in that to match somebody with somebody on sintering belt type roasting machine
It is equipped with first and second mixing distributing device and No. first and second igniter；Whole SINTERING PRODUCTION adopts a set of exhausting system；First carry out
Cloth, after bed material distributing device grate-layer material, then by mixture distributor device cloth sinter mixture, lights a fire and sinters, pre- first
After sintering, second cloth sinter mixture is carried out in cloth layer surface first, sintering suction pressure keeps constant, to second cloth
The bed of material carries out igniting sintering, and when second bed of cloth completes to light a fire, the compound of bed of cloth is sintered first, in sintering
At machine tail, bed of cloth and second bed of cloth are complete sintering first；Compound for cloth first arranges dispensing, mixing
And granulating system, it is that the compound of second cloth arranges dispensing, mixing and granulating system, first during cloth, sinter mixture
Middle iron-bearing material is 100% limonite, and in 2.25-2.35, moisture weight percentage is 7.7%-8.5% to basicity, and the bed of material is high
The degree chassis baffle plate high with 600-900mm is flushed, and firing temperature is controlled at 900 DEG C -1050 DEG C, after pre-sintered 4-20min, is adopted
Trapezoidal cloth method is used, more than chassis baffle plate, carries out second cloth, in the sinter mixture of second cloth, iron-bearing material again
For one or two in the magnetite concentrate or hematite concentrates of the limonite and 60%-100% of 0-40%, basicity is in 1.70-
1.95, moisture weight percentage is 7.2%-7.6%, and in 200mm-350mm, firing temperature control is 1100 for fabric thickness control
℃-1250℃；In total sinter mixture, it is 60%-90% that limonite accounts for the percentage by weight of total iron charge；Compound total alkali
Degree is in 2.0-2.25.
2. according to claim 1 a kind of using pre-sintered limonite super thick bed of material sintering method, it is characterised in that to burn
Knot flux is lime stone, quick lime, magnesite.
3. according to claim 1 a kind of using pre-sintered limonite super thick bed of material sintering method, it is characterised in that first
Secondary bed of cloth thickness and second bed of cloth thickness sum >=900mm；In whole sintering process, the sintering machine speed of service is 1.5m/
Min-2.5m/min, sinters suction pressure >=7000pa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610815344.7A CN106498152B (en) | 2016-09-12 | 2016-09-12 | A kind of limonite super thick bed of material sintering method using pre-sintering |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610815344.7A CN106498152B (en) | 2016-09-12 | 2016-09-12 | A kind of limonite super thick bed of material sintering method using pre-sintering |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106498152A true CN106498152A (en) | 2017-03-15 |
| CN106498152B CN106498152B (en) | 2018-05-29 |
Family
ID=58290503
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610815344.7A Active CN106498152B (en) | 2016-09-12 | 2016-09-12 | A kind of limonite super thick bed of material sintering method using pre-sintering |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106498152B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109022659A (en) * | 2018-09-30 | 2018-12-18 | 兰州有色冶金设计研究院有限公司 | A kind of distribution device producing sponge iron and method |
| CN113249566A (en) * | 2021-03-03 | 2021-08-13 | 广西北港新材料有限公司 | Sintering system and method for limonite type laterite-nickel ore |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03193828A (en) * | 1989-12-22 | 1991-08-23 | Nippon Steel Corp | Production of sintering raw material and sintered ore |
| JPH09209050A (en) * | 1996-02-05 | 1997-08-12 | Nippon Steel Corp | Manufacture of sintered ore by high layer thickness |
| CN102242255A (en) * | 2011-06-27 | 2011-11-16 | 攀钢集团有限公司 | Method for sintering high-titanium vanadium titanium magnetite concentrate mixed with limonite |
| CN104278144A (en) * | 2013-07-08 | 2015-01-14 | 鞍钢股份有限公司 | Method for improving limonite sintering productivity |
| CN105316478A (en) * | 2014-06-11 | 2016-02-10 | 鞍钢股份有限公司 | Sintering production method increasing limonite proportion |
-
2016
- 2016-09-12 CN CN201610815344.7A patent/CN106498152B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03193828A (en) * | 1989-12-22 | 1991-08-23 | Nippon Steel Corp | Production of sintering raw material and sintered ore |
| JPH09209050A (en) * | 1996-02-05 | 1997-08-12 | Nippon Steel Corp | Manufacture of sintered ore by high layer thickness |
| CN102242255A (en) * | 2011-06-27 | 2011-11-16 | 攀钢集团有限公司 | Method for sintering high-titanium vanadium titanium magnetite concentrate mixed with limonite |
| CN104278144A (en) * | 2013-07-08 | 2015-01-14 | 鞍钢股份有限公司 | Method for improving limonite sintering productivity |
| CN105316478A (en) * | 2014-06-11 | 2016-02-10 | 鞍钢股份有限公司 | Sintering production method increasing limonite proportion |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109022659A (en) * | 2018-09-30 | 2018-12-18 | 兰州有色冶金设计研究院有限公司 | A kind of distribution device producing sponge iron and method |
| CN113249566A (en) * | 2021-03-03 | 2021-08-13 | 广西北港新材料有限公司 | Sintering system and method for limonite type laterite-nickel ore |
| CN113249566B (en) * | 2021-03-03 | 2023-02-07 | 广西北港新材料有限公司 | Sintering system and method for limonite type laterite-nickel ore |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106498152B (en) | 2018-05-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104630449B (en) | Method for preparing sintered ore by using high-chromium-type vanadium-titanium mixture | |
| CN102127636B (en) | Method for preparing low-SiO2 high-performance sinter ore | |
| CN106480307B (en) | A method of improving homogeneous agglomerate | |
| CN105274269B (en) | A kind of distributing method of sinter mixture | |
| CN105132673B (en) | A kind of method for reducing carbon containing dust pellet material composite agglomeration solid fuel consumption | |
| CN104060083B (en) | Sintering method of vanadium titanium magnetite | |
| CN101928823A (en) | Sintering method of iron ore powder with high content of crystal water | |
| CN105308194A (en) | Carbon material-containing granulated particles for manufacturing sintered ore, production method therefor, and production method for sintered ore | |
| CN103334004B (en) | Method for producing sinter from Yuanjia village concentrate powder by using large sintering machine | |
| CN104726696B (en) | Middle basicity deep-bed sintering production method | |
| CN108774683B (en) | A kind of high magnesium composite sinter and its production method | |
| CN104099466A (en) | Production method of bilayer structure pellet and production equipment thereof | |
| CN109576488A (en) | A method of sinter is produced using high proportion Bayan Obo iron ore concentrate | |
| CN106350667B (en) | A kind of super thick bed of material sintering method using pre-sintering reducing small grain size content | |
| CN106498152B (en) | A kind of limonite super thick bed of material sintering method using pre-sintering | |
| CN111100981B (en) | Method for improving metallurgical performance of manganese-rich slag smelted manganese sinter | |
| CN105316478B (en) | A kind of sintering production method for improving limonite proportioning | |
| CN104278144B (en) | A kind of method improving limonite sintering productivity ratio | |
| CN106337113B (en) | A kind of super thick bed of material sintering method using pre-sintering | |
| CN106337117A (en) | Super-thick material layer sintering method for dual-alkalinity complex sintered ore | |
| CN101994002A (en) | Method for sintering ore blending of Jianshan concentrate fines and limonite | |
| CN110317948A (en) | A kind of sintering method of plum mountain iron ore concentrate | |
| CN103160683A (en) | Roasting pretreatment method for high crystal water content iron ore | |
| CN108796212A (en) | A kind of method of the compound fine iron breeze production sinter of self-fluxing nature | |
| CN109182735A (en) | Highly crystalline water limonite sintering method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB03 | Change of inventor or designer information | ||
| CB03 | Change of inventor or designer information |
Inventor after: Tang Fuping Inventor after: Xu Libing Inventor after: Gong Zuoyan Inventor after: Wu Yuanfei Inventor after: Liu Jie Inventor after: Zhou Mingshun Inventor after: Di Liwei Inventor after: Yao Lin Inventor after: Wang Yidong Inventor after: Han Shufeng Inventor after: Ren Ziping Inventor after: Zhang Hui Inventor before: Liu Jie Inventor before: Xu Libing Inventor before: Gong Zuoyan Inventor before: Wu Yuanfei Inventor before: Zhou Mingshun Inventor before: Tang Fuping Inventor before: Di Liwei Inventor before: Yao Lin Inventor before: Wang Yidong Inventor before: Han Shufeng Inventor before: Ren Ziping Inventor before: Zhang Hui |
|
| GR01 | Patent grant | ||
| GR01 | Patent grant |