CN100434355C - Waste hydrochloric acid regeneration silicon removal process and equipment - Google Patents
Waste hydrochloric acid regeneration silicon removal process and equipment Download PDFInfo
- Publication number
- CN100434355C CN100434355C CNB2005100464967A CN200510046496A CN100434355C CN 100434355 C CN100434355 C CN 100434355C CN B2005100464967 A CNB2005100464967 A CN B2005100464967A CN 200510046496 A CN200510046496 A CN 200510046496A CN 100434355 C CN100434355 C CN 100434355C
- Authority
- CN
- China
- Prior art keywords
- dynamic mixer
- pipeline
- spent acid
- hydrochloric acid
- waste hydrochloric
- 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.)
- Expired - Fee Related
Links
- 238000000034 method Methods 0.000 title claims abstract description 19
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims abstract description 18
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 18
- 239000010703 silicon Substances 0.000 title claims abstract description 18
- 239000002699 waste material Substances 0.000 title claims abstract description 18
- 238000007131 hydrochloric acid regeneration reaction Methods 0.000 title claims description 11
- 239000002253 acid Substances 0.000 claims abstract description 40
- 230000000694 effects Effects 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000010438 heat treatment Methods 0.000 claims abstract description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 9
- 239000010439 graphite Substances 0.000 claims abstract description 9
- 238000004062 sedimentation Methods 0.000 claims abstract description 9
- 239000004743 Polypropylene Substances 0.000 claims abstract description 7
- -1 polypropylene Polymers 0.000 claims abstract description 7
- 229920001155 polypropylene Polymers 0.000 claims abstract description 7
- 238000005189 flocculation Methods 0.000 claims description 12
- 230000016615 flocculation Effects 0.000 claims description 12
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 229910021529 ammonia Inorganic materials 0.000 claims description 5
- 230000003647 oxidation Effects 0.000 claims description 5
- 238000007254 oxidation reaction Methods 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 238000009833 condensation Methods 0.000 claims description 3
- 230000005494 condensation Effects 0.000 claims description 3
- 239000000706 filtrate Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 abstract description 9
- 238000002156 mixing Methods 0.000 abstract description 5
- 230000008929 regeneration Effects 0.000 abstract description 3
- 238000011069 regeneration method Methods 0.000 abstract description 3
- 239000002002 slurry Substances 0.000 abstract description 3
- 230000008901 benefit Effects 0.000 abstract 2
- 239000008394 flocculating agent Substances 0.000 abstract 2
- 238000001556 precipitation Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 239000000377 silicon dioxide Substances 0.000 description 8
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 229920001296 polysiloxane Polymers 0.000 description 4
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 3
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000003311 flocculating effect Effects 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 235000011114 ammonium hydroxide Nutrition 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000010960 cold rolled steel Substances 0.000 description 1
- 238000005097 cold rolling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 210000000664 rectum Anatomy 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Landscapes
- Removal Of Specific Substances (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention improves the existing regeneration silicon removal technology of waste hydrochloric acid, thereby providing a regeneration silicon removal process and equipment of waste hydrochloric acid. The main technical characteristics are that: the direct heating of the steam is changed into the indirect heating of a graphite heat exchanger, the heating is uniform, the heat conduction efficiency is high, the steam consumption is low, and the temperature controllability is good; replacing magnetic manual speed-regulating stirrer with automatic frequency-changing speed regulator to accelerate Fe (OH)3Generating; a dynamic mixer is added in a straight pipe section from an overflow pipe of a reaction tank to a settling tank, so that turbulent flow is generated when waste acid and a flocculating agent pass through, and mixing is accelerated; a reinforced polypropylene pipeline is additionally arranged from the outlet of the slurry pump to the inlet of the dynamic mixer, a small amount of slurry is pumped into the dynamic mixer, the sedimentation of suspended matters in waste acid is accelerated, and an ideal silicon removal effect is achieved. The invention has the advantages of stable temperature control, full chemical reaction, good precipitation effect and the like. The application of the invention can effectively control the pH value of the waste acid, obviously enhance the mixing effect of the flocculating agent and the waste acid, reduce the silicon content in the treated waste acid by about 0.044 percent in the same ratio and have very obvious economic benefit.
Description
Technical field
The invention belongs to the spent acid processing technology field, particularly waste hydrochloric acid regeneration and silicon removing process and equipment.
Background technology
As everyone knows, hot rolled strip is in that carry out must be through overpickling before cold rolling, and waste hydrochloric acid regeneration and silicon removing is requisite one an auxiliary treatment technology in the pickling process.The band steel cleans through persalt, removes the iron scale on surface, to guarantee the surface quality of cold-rolled steel sheet.Its chemical equation is:
FeO+2HCl＝FeCl
2+H
2O
Iron protochloride (the FeCl that in acid cleaning process, produces
2) need deliver to regeneration unit carry out roasting, its chemical equation is:
2FeCl
2+2H
2O+1/2O
2＝Fe
2O
3+4HCl
The HCl that generates enters the absorption tower and becomes hydrochloric acid, sends pickling line back to and washes the band steel; Fe
2O
3(being commonly called as iron oxide red) is used for the raw material of magneticsubstance as byproduct.As magneticsubstance, to silicone content have relatively high expectations (＜0.01%).Therefore, abraum salt acid is before regenerating, and the silicon that it must be contained is removed.At present, Chang Yong silica removal device and technical process are as shown in Figure 3.
Existing waste hydrochloric acid regeneration and silicon removing process is the sedimentation by a certain amount of ironic hydroxide, and silicon is taken out of from spent acid.The concrete operations step is: spent acid is got to the spent acid pump soaked molten tower, add iron filings in soaking molten tower, make the HCl reaction in itself and the spent acid, to improve the pH value of spent acid.For accelerated reaction, feed steam toward soaking in the molten tower.Reacted spent acid to the ammonia react jar, with ammoniacal liquor reaction wherein, further improves the pH value of spent acid through supercooler, and acid solution is passed through the pressurized air bubbling in oxidation tank, with part Fe
2+Be oxidized to Fe
3+Chemical equation is:
Oxidising process is carried out in retort, Fe (OH)
3After fully generating, in the upflow tube of retort, add flocculation agent (P1200), Fe in slurry tank (OH)
3With most of SiO
2At the bottom of being deposited to jar, get to pressure filter by slush pump at last and purify, the clear liquid behind the silica removal overflows in the filtrate collection jar.
Utilize existing equipment and technology to carry out the silica removal processing and have following several respects problem:
1, steam directly feeds to soak in the molten tower spent acid is heated, and in heat-processed, especially winter, a part of water of condensation enters in the spent acid, and acid-spending strength is reduced, and is unfavorable for the chemical reaction of the hydrogenchloride in iron filings and the spent acid.In addition, at outdoor steam pipe system, especially under situation about not heating, freeze easily and damage;
2, since the retort upflow tube to be straight tube between the setting tank, flocculation agent (P1200) was lacked with spent acid residence time in pipeline, mixed effect is bad, directly influences flocculating effect;
3, sedimentation effect is undesirable.Reason is that the content and the proportion of suspended substance in the spent acid does not reach flocculation agent (P1200) and mixed sedimentation speed of spent acid and effect.
Summary of the invention
In order to overcome the deficiency that above-mentioned prior art exists, improve the silica removal effect, the present invention improves existing installation and technology, increases facilities such as graphite heater, speed control by frequency variation, dynamic mixer, thereby a kind of waste hydrochloric acid regeneration and silicon removing process and equipment are provided.Through improving, a complete set of silica removal device busy state is issued to design and operational requirement, has characteristics such as stable temperature control, chemical reaction is abundant, sedimentation effect is obvious.Use the present invention and can make that the silicone content in the spent acid obviously reduces behind the silica removal, reach design objective.
Technical scheme of the present invention and technical process are achieved in that as shown in Figure 4
1, makes the steam direct heating into the graphite heat exchanger indirect heating.The characteristics of graphite heat exchanger are to be heated evenly, the heat conduction efficiency height, and steam consumption is low, and temperature is controlled good.Simultaneously, owing to there is not water of condensation to enter spent acid, make spent acid keep original concentration.
2, make the manual speed governing agitator of the magnetic force of ammonia jar, oxidation tank and retort into automatic frequency-conversion speed governing agitator.Be characterized in to regulate arbitrarily according to different technology conditions the rotating speed of agitator, thereby increase
The speed of response of generative process.
3, at retort upflow tube dynamic mixer of straight length increase to setting tank.Prolong the mixing time of flocculation agent and spent acid with it, increase mixed effect.The concrete structure of dynamic mixer is to be made of a nonlinear type pipeline and zig-zag baffle plate.The baffle plate of several zigzag fashions is installed in the nonlinear type pipeline, and baffle plate is staggered and arranges in pipeline.Its effect is to produce turbulent flow when spent acid and flocculation agent during by the sawtooth baffle plate, quickens to mix, and prolongs mixing time by the nonlinear type dynamic mixer, and flocculation and sedimentation effect obviously strengthen, and the silica removal effect is obviously improve also.
4, increase Reinforced Polypropylene (PPH) pipeline of a Φ 15 to the ingress of dynamic mixer in the slush pump exit, a spot of mud is squeezed into dynamic mixer, the flocculating effect that makes suspension content in the spent acid and proportion reach flocculation agent (P12000), quicken flocculation sediment, reach perfect condition.
The present invention compares with prior art, has following useful effect:
1. stable temperature control, chemical reaction is abundant;
2. control the pH value in the spent acid effectively, increased stirring and reaction effect;
3. the mixed effect of flocculation agent and spent acid obviously strengthens;
4. improved sedimentation effect, the silicone content in the spent acid falls on a year-on-year basis about 0.044% after treatment.
5. reduction running cost is increased economic efficiency.
Description of drawings
Fig. 1 is the waste hydrochloric acid regeneration and silicon removing process schema
Fig. 2 is the dynamic mixer structural representation
Fig. 3 is the process flow sheet of prior art
Fig. 4 is the process flow sheet of the technology of the present invention
Among Fig. 1: 1 is that spent acid storage tank, 2 is that spent acid pump, 3 is that graphite heater, 4 is that water cooler, 6 is that ammonia jar, 7 is that oxidation tank, 8 is that retort, 9 is that dynamic mixer, 10 is that setting tank, 11 is that slush pump, 12 is that pressure filter, 13 is the filtrate collection jar for soaking molten tower, 5;
Among Fig. 2: 14 is that pipeline, 15 is the zigzag fashion baffle plate.
Embodiment
Embodiment in 1 and 4 is described in detail the technology of the present invention in conjunction with the accompanying drawings.
Make existing steam direct heating into graphite heat exchanger 3 indirect heating; Replace the manual speed governing agitator of magnetic force with the automatic frequency-conversion speed regulator; At retort 8 upflow tubes dynamic mixer 9 of straight length increase to setting tank 10; Export to Reinforced Polypropylene (PPH) pipeline of a Φ 15 of ingress increase of dynamic mixer 9 at slush pump 11.
Dynamic mixer 9 is to be made of Reinforced Polypropylene (PPH) pipe 14 and baffle plate 15.Circuit design is the M type, specific constructive form as shown in Figure 2, pipeline 14 latus rectums are 125mm, the installed inside zigzag fashion baffle plate 15 at 1/3rd places, top of the intermediate duct cross section of 1/3rd places, bottom of the inlet of dynamic mixer, export pipeline cross section and dynamic mixer.
Use waste hydrochloric acid regeneration and silicon removing process provided by the invention and equipment, when spent acid and flocculation agent just produce turbulent flow during by M type dynamic mixer, prolong mixing time simultaneously at the acceleration blended, thereby flocculation and sedimentation effect are obviously strengthened, the silica removal effect also obviously improves.Test-results shows that the silicone content in the iron oxide red drops to 0.006%, well below design load (0.01%) by 0.05% before improving.
Claims (3)
1, a kind of waste hydrochloric acid regeneration and silicon removing process is characterized in that: adopt the graphite heat exchanger indirect heating, and the heat conduction efficiency height, steam consumption is low, prevents that water of condensation from entering spent acid, keeps the original concentration of spent acid; Replace magnetic force manual setting agitator with the automatic frequency-conversion speed regulator, quicken Fe (OH)
3Generation; Increase the dynamic mixer that constitutes by a nonlinear type pipeline and zig-zag baffle plate at the retort upflow tube to the straight length of setting tank, make spent acid and flocculation agent by the time produce turbulent flow, quicken to mix; Ingress in the slush pump exit to dynamic mixer increases a Reinforced Polypropylene pipeline, and a spot of mud is squeezed into dynamic mixer, quickens the sedimentation of suspended substance in the spent acid, reaches ideal and falls the silicon effect.
2, be used to implement the equipment of a kind of waste hydrochloric acid regeneration and silicon removing process of claim 1, by spent acid storage tank (1), spent acid pump (2), soak molten tower (4), water cooler (5), ammonia jar (6), oxidation tank (7), retort (8), setting tank (10), slush pump (11), pressure filter (12), filtrate collection jar (13) and form; It is characterized in that: increased graphite heat exchanger (3), dynamic mixer (9) and Reinforced Polypropylene pipeline, existing steam direct heating is made into by graphite heat exchanger (3) indirect heating; Make the manual speed governing agitator of the magnetic force of ammonia jar (6), oxidation tank (7) and retort (8) into automatic frequency-conversion speed governing agitator; Increase dynamic mixer (9) at the retort upflow tube to the straight length of setting tank by a nonlinear type pipeline (14) and zig-zag baffle plate (15) formation; Increase the Reinforced Polypropylene pipeline of a Φ 15 to the ingress of dynamic mixer (9) in slush pump (11) exit.
3, according to the described equipment that is used to implement a kind of waste hydrochloric acid regeneration and silicon removing process of claim 1 of claim 2, the pipeline (14) that it is characterized in that described dynamic mixer (9) is designed to nonlinear type, the baffle plate (15) of several zigzag fashions is installed in pipeline, and baffle plate (15) is staggered and arranges in pipeline (14).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100464967A CN100434355C (en) | 2005-05-20 | 2005-05-20 | Waste hydrochloric acid regeneration silicon removal process and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100464967A CN100434355C (en) | 2005-05-20 | 2005-05-20 | Waste hydrochloric acid regeneration silicon removal process and equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1857991A CN1857991A (en) | 2006-11-08 |
| CN100434355C true CN100434355C (en) | 2008-11-19 |
Family
ID=37296953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100464967A Expired - Fee Related CN100434355C (en) | 2005-05-20 | 2005-05-20 | Waste hydrochloric acid regeneration silicon removal process and equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100434355C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104512865B (en) * | 2013-09-26 | 2016-08-17 | 宝山钢铁股份有限公司 | Except in silicon and reaction neutralize medicament ammonia addition control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076143A (en) * | 1993-03-10 | 1993-09-15 | 上海矽钢片厂 | Regenerating technique for waste material of silicon sheet |
| US6210650B1 (en) * | 1993-07-21 | 2001-04-03 | Andritz-Patentverwaltungs-Gesellschaft M.B.H | Process for regenerating hydrochloric acid from pickling plants |
| CN1302917A (en) * | 2001-02-08 | 2001-07-11 | 成都华西化工研究所 | Process for removing silicon from used acid after pickling |
| CN1356406A (en) * | 2000-11-30 | 2002-07-03 | 黄卓林 | Process for removing Si and Al from solution of ferrous chloride |
-
2005
- 2005-05-20 CN CNB2005100464967A patent/CN100434355C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1076143A (en) * | 1993-03-10 | 1993-09-15 | 上海矽钢片厂 | Regenerating technique for waste material of silicon sheet |
| US6210650B1 (en) * | 1993-07-21 | 2001-04-03 | Andritz-Patentverwaltungs-Gesellschaft M.B.H | Process for regenerating hydrochloric acid from pickling plants |
| CN1356406A (en) * | 2000-11-30 | 2002-07-03 | 黄卓林 | Process for removing Si and Al from solution of ferrous chloride |
| CN1302917A (en) * | 2001-02-08 | 2001-07-11 | 成都华西化工研究所 | Process for removing silicon from used acid after pickling |
Non-Patent Citations (2)
| Title |
|---|
| 宝钢冷扎厂酸再生工艺简介及设备特点. 张春青.工业加热，第33卷第4期. 2004 |
| 宝钢冷扎厂酸再生工艺简介及设备特点. 张春青.工业加热，第33卷第4期. 2004 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1857991A (en) | 2006-11-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101172727B (en) | Waste hydrochloric acid liquid cleaning treatment technique | |
| CN103214092B (en) | A kind of biological denitrification apparatus | |
| CN103754957B (en) | A kind of method adopting hydrochloric acid pickling waste liquor to prepare high-quality brown iron oxide | |
| CN107162158A (en) | A kind of fluid bed Fenton reactor and method | |
| CN106495215B (en) | A kind of method that magnesium arsenate is produced containing arsenic waste solution | |
| CN104045209B (en) | Cold rolling wastewater treatment process | |
| CN115043545B (en) | Magnetic flocculation coupling photocatalysis water purifying method and magnetic flocculation coupling photocatalysis water purifying device | |
| CN100430521C (en) | Purification treatment process of waste liquor of hydrochloric acid | |
| CN100434355C (en) | Waste hydrochloric acid regeneration silicon removal process and equipment | |
| CN106566926A (en) | Deironing device, and low-temperature continuous deironing method | |
| CN209974509U (en) | Thin-film solar cell production wastewater treatment system | |
| CN204490523U (en) | The continuous bittern purifying device of lime-saltcake-flue gas method | |
| JPS62270416A (en) | Method for continuously synthesizing aqueous solution of aluminum sulfate from aluminum hydroxide sludge and device thereof | |
| CN115403049A (en) | Purification method and purification system of quartz sand | |
| CN108128874A (en) | Ammonia nitrogen treatment method in cold-rolled sheet wastewater | |
| CN1302917A (en) | Process for removing silicon from used acid after pickling | |
| CN204607739U (en) | A kind of steel industry spent pickle liquor and flushing waste water near zero release treatment system | |
| CN113816526A (en) | Water quenching water recycling treatment process for cold rolling continuous annealing unit | |
| US11021772B2 (en) | Method and device for removing iron in iron-containing solution in hydrometallurgy | |
| CN113584497A (en) | Strip steel pickling device and method | |
| CN219670595U (en) | Iron removing device for leaching liquid | |
| CN109735899B (en) | A kind of resource utilization method of trade waste | |
| CN211198921U (en) | Low-temperature hydrogen peroxide catalytic oxidation reaction device | |
| CN210885692U (en) | Integrated device for coordinative treatment of desulfurization wastewater and domestic sewage | |
| JP3684477B2 (en) | Treatment method for petroleum combustion ash |
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 | ||
| 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: 20081119 Termination date: 20200520 |