CN102344983B - Device for preparing hot molten iron and byproducts by using red mud - Google Patents
Device for preparing hot molten iron and byproducts by using red mud Download PDFInfo
- Publication number
- CN102344983B CN102344983B CN2011102714017A CN201110271401A CN102344983B CN 102344983 B CN102344983 B CN 102344983B CN 2011102714017 A CN2011102714017 A CN 2011102714017A CN 201110271401 A CN201110271401 A CN 201110271401A CN 102344983 B CN102344983 B CN 102344983B
- Authority
- CN
- China
- Prior art keywords
- outlet
- diversion trench
- red mud
- molten steel
- head
- 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
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B19/00—Combinations of furnaces of kinds not covered by a single preceding main group
- F27B19/04—Combinations of furnaces of kinds not covered by a single preceding main group arranged for associated working
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/006—Starting from ores containing non ferrous metallic oxides
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
- C21B13/085—Making spongy iron or liquid steel, by direct processes in rotary furnaces wherein iron or steel is obtained in a molten state
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a device for preparing hot molten iron and byproducts by using red mud. The device comprises a rotary furnace, a flow guide groove and a melting furnace, wherein the rotary furnace is provided with a smoke outlet and a discharge port; the flow guide groove is provided with a feed port and a slag removal port; the feed port is communicated with the discharge port; the head of the flow guide groove is provided with three fuel gas guns; a hot molten iron outlet is formed below the head of the flow guide groove and is connected with a ladle or a pig-casting machine; and the melting furnace is provided with a slag inlet which is communicated with a slag outlet and is also provided with a cement clinker outlet, a silicon-titanium-alloy alloy outlet and a bottom outlet. The device has the advantages that: the problem of incapability of spitting out slag in a blast furnace process can be solved without doping a large amount of calcium compound or using coke, and the cost is greatly reduced; toxic red mud is to be recycled to obtain elementary iron, so that the problems of occupation of land by the red mud and environmental pollution are solved; byproducts of silicon-titanium-aluminum alloy, overheated steam, sodium salt, microlite powder and the like can also be obtained; and the aims of zero emission of solid pollutants, gas up-to-standard emission, low-carbon emission and environmental friendliness are fulfilled.
Description
Technical field
The invention belongs to the Metal smelting technical field, be specifically related to a kind of device that utilizes red mud to produce heating molten steel and byproduct.
Background technology
Red mud, its main component is: aluminum oxide 5%～25%; Ferric oxide 30%～55%; Silicon oxide 5%～25%; Sodium oxide 3%～9%; Sodium salt 10%～15% burns; Titanium oxide, magnesium oxide, calcium oxide etc. 5%～10%.It is bigger that it generally contains the ferric oxide amount, and outward appearance is similar to redness of the skin or complexion earth, thereby gains the name; The contaminative waste residue of discharging when it is Aluminium industry extraction aluminum oxide, its pH value is very high, and the pH value of leach liquor is 12.1～13.0.In suitability for industrialized production, 1 ton of aluminum oxide of the every production of average, 1～2 ton of red mud of subsidiary generation.China is as the world the 4th big alumina producing state, and the red mud of annual discharging is up to tens million of tons, and about 7,000 ten thousand tons of the red mud of the annual generation in the whole world.The a large amount of red mud of annual constantly generation can not fully effectively utilize, Human's production, life are caused many-sided direct and indirect influence, so reduce output and the harm of red mud to greatest extent, realization by all kinds of means, the resource utilization of quantity is extremely urgent greatly.Owing to red mud is not still had effective industrialized treatment method both at home and abroad before this, though developed country also mostly be to enter marine or store up.China's relevant industries generally can only be stored up in the past, have both taken a large amount of soils, again soil, water source, atmosphere etc. are polluted.It is generally acknowledged that sodium salt content is that 30～400mg/L is the suitable scope at public water source, and the sodium salt degree of wastewater from red mud is up to 26348mg/L, the wastewater from red mud of high sodium salt degree like this enters water body, and its pollution is self-evident.For solving this difficult problem, people once attempted to use blast furnace process, magnetic method (comprising the superconducting magnetic separation method) or flotation process, extract the iron in the red mud, and " digestion " red mud of storing up in a large number by this, but, because the iron in the red mud exists with states such as deep oxidation iron, molysite, so magnetic method (comprising the superconducting magnetic separation method), gravity separation method or flotation process can't be extracted iron wherein at all; And blast furnace process, because wherein contain relatively large aluminium, titanium and compound thereof, and since the unusual thickness of these materials, the carrying out that has not only stoped the gas-solid liquid phase reaction in the blast furnace, and make that blast furnace " scum " can not; Though can mix a large amount of calcium containing compounds to solve " thickness " problem, just increased production cost greatly, there has not been benefit substantially, lost practicality, so no longer be used.
Summary of the invention
The technical problem to be solved in the present invention is: overcome the deficiencies in the prior art, a kind of device that utilizes red mud to produce heating molten steel and byproduct is provided, it both can solve the problem that magnetic method in the prior art (comprising the superconducting magnetic separation method), gravity separation method or flotation process can't be chosen at all, also can solve blast furnace process " scum " can not problem, make and red mud resource utilization toxic, that pollute obtain fe; And reach the solid pollutant zero release.
The technical solution adopted for the present invention to solve the technical problems is: a kind of device that utilizes red mud to produce heating molten steel and byproduct, comprise rotary kiln, described rotary kiln afterbody is provided with exhanst gas outlet, head is provided with discharge port, it is characterized in that: also comprise a diversion trench, described diversion trench afterbody is provided with feeding mouth, head is provided with slag notch, and described feeding mouth is communicated with described discharge port; At described diversion trench head, at least one gas gun is installed, the muzzle of described gas gun is towards blanking place of described diversion trench afterbody; The described feeding mouth while is as the air outlet of diversion trench;
Described diversion trench head downside is provided with the heating molten steel outlet; Described heating molten steel outlet is lower than described slag notch.
Preferably, the feeding mouth of described diversion trench and the discharge port of described rotary kiln are by the channel connection that is built into by refractory materials.
Preferably, at described diversion trench head, three gas guns are installed, the muzzle of described gas gun is all towards blanking place of described diversion trench afterbody.
Preferably, the different heights place in the described diversion trench afterbody left and right sides is respectively arranged with at least one gas gun, and the muzzle of described gas gun is all towards blanking place of described diversion trench afterbody.
Preferably, also comprise the molten stove that divides, stove top was provided with into cinder notch in described molten minute, describedly went into the slag notch of cinder notch and described diversion trench by being built into channel connection by refractory materials; Describedly go into cinder notch simultaneously as the molten air outlet of dividing stove.
Preferably, the exhanst gas outlet of described rotary kiln is communicated with through a waste heat boiler and water curtain dedusting sodium salt suction tower.
Preferably, described heating molten steel outlet connects a ladle or a pig-casting machine.
Preferably, the stove middle part was provided with cement clinker outlet in described molten minute, and the bottom is provided with silicon titanium aluminum alloy outlet, and the bottom is provided with an outlet at bottom.
Compared with prior art, the invention has the beneficial effects as follows: it needn't mix a large amount of calcium containing compounds, also must not use coke, just can solve blast furnace process in the prior art " scum " can not problem, reduced production cost widely; With making poisonous red mud resource utilization, obtain fe, its rate of recovery can reach more than 99%, has solved red mud occupation of land, problem of environment pollution caused; Can also obtain such as byproducts such as silicon titanium aluminum alloy, superheated vapour, sodium salt, crystallite stone flours, and make the large-scale industrial production of float glass process microlite become possibility.And whole process of production reaches the solid pollutant zero release, gas qualified discharge, real low-carbon emission, environmental protection.It is a big good recycling economy project.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention one;
Fig. 2 is the structural representation of the embodiment of the invention two.
Be labeled as among the figure:
1, rotary kiln; 11, exhanst gas outlet; 12, discharge port; 13, waste heat boiler; 14, water curtain dedusting sodium salt is inhaled tower; 2, diversion trench; 21, feeding mouth; 22, slag notch; 23, gas gun; 24, heating molten steel outlet; 25, ladle; 26, pig-casting machine; 3, the molten stove that divides; 31, go into cinder notch; 32, cement clinker outlet; 33, silicon titanium aluminum alloy outlet; 34, outlet at bottom.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described further:
Embodiment one
As shown in Figure 1, during installation, rotary kiln 1, diversion trench 2, the molten residing position of stove 3 threes of dividing reduce successively, and their each own heads or bottom are all low with respect to the height on its afterbody or top, that is: the head of rotary kiln 1 is lower slightly than its afterbody; The afterbody of diversion trench 2 is lower than the head of rotary kiln 1, but is higher than the head of diversion trench 2; The molten top of stove 3 of dividing is lower than the head of diversion trench 2, but is higher than the molten bottom of dividing stove 3.
A kind of device that utilizes red mud to produce heating molten steel and byproduct, comprise rotary kiln 1, diversion trench 2, the molten stove 3 that divides, described rotary kiln 1 afterbody is provided with exhanst gas outlet 11, head is provided with discharge port 12, and the exhanst gas outlet 11 of described rotary kiln 1 is inhaled tower 14 through waste heat boiler 13 and a water curtain dedusting sodium salt and is communicated with; Described diversion trench 2 afterbodys are provided with feeding mouth 21, head is provided with slag notch 22; The feeding mouth 21 of described diversion trench 2 afterbodys and the channel connection of discharge port 12 by being built into by refractory materials of described rotary kiln 1 head, described 21 whiles of feeding mouth are as the air outlet of diversion trench 2;
At described diversion trench 2 heads, three gas guns 23 are installed, the different heights place in the described diversion trench 2 afterbody left and right sides is respectively arranged with a gas gun 23, and the muzzle of described gas gun 23 is all towards blanking place of the feeding mouth 21 of described diversion trench 2 afterbodys;
Described diversion trench 2 head downsides are provided with heating molten steel outlet 24, and described heating molten steel outlet 24 is lower than the slag notch 22 of described diversion trench 2 heads; Described heating molten steel outlet 24 connects ladle 25;
The stove middle part was provided with cement clinker outlet 32 in described molten minute, and the bottom is provided with silicon titanium aluminum alloy outlet 33, and the bottom is provided with an outlet at bottom 34.
Embodiment two
As shown in Figure 2, the heating molten steel of described diversion trench 2 head downsides outlet 24 connects pig-casting machine 26; Other all with embodiment one in identical.
Working process of the present invention is as follows:
As shown in Figure 1, 2, according to the ratio of weight percent 1: 0.05～0.35: 0.2～0.5, get red mud, lime, coal, and they are mixed, make mixed raw material and join in the rotary kiln 1, temperature is at 800～1460 degree Celsius in the rotary kiln 1; Mixed raw material through 2～10 hours, is dried in rotary kiln 1, prereduction, generates the reducing material that is the semi-melting state; Temperature from afterbody to head in the rotary kiln 1 edges up to 1460 degree from 800 degree Celsius; With the discharge port 12 of above-mentioned reducing material by rotary kiln 1, through the feeding mouth 21 of diversion trench 2, enter in the diversion trench 2; Described 21 whiles of feeding mouth are as the air outlet of diversion trench 2; At described diversion trench 2 heads three gas guns 23 have been installed, different heights place in the described diversion trench 2 afterbody left and right sides, be provided with a gas gun 23 respectively, the muzzle of all gas guns 23 all towards blanking place of the feeding mouth 21 of described diversion trench 2 afterbodys, carries out jet, combustion-supporting to reducing material; Temperature is at 1450～1700 degree Celsius in the diversion trench 2, and reducing material through 1～4 hour, carries out fusion in diversion trench 2, slag iron separates; The slag on upper strata is discharged by slag notch 22, and the heating molten steel of lower floor is flowed out by heating molten steel outlet 24; The heating molten steel that flows out enters ladle 25 or pig-casting machine 26;
If in the used red mud, the content of titanium aluminium is higher, just adopts following method: the slag by the slag notch 22 of diversion trench 2 is discharged, and divide the cinder notch 31 of going into of stove 3 to enter molten the branch in the stove 3 through melting, temperature are made as 2250～2400 degree Celsius in the molten branch stove 3; Add metallic reducing agent, kept 30～100 minutes; Divide the cement clinker outlet 32 of stove 3 to obtain cement clinker by molten, divide the silicon titanium aluminum alloy outlet 33 of stove 3 to obtain the silicon titanium aluminum alloy by molten;
If in the used red mud, the content of titanium aluminium is lower, just adopts following method: the slag by the slag notch 22 of diversion trench 2 is discharged, and divide the cinder notch 31 of going into of stove 3 to enter molten the branch in the stove 3 through melting, temperature are made as 1400～1700 degree Celsius in the molten branch stove 3; Add finings, kept 30～120 minutes; Obtain the crystallite stone flour by the molten outlet at bottom 34 of stove 3 that divides;
The flue gas that gives off from the exhanst gas outlet 11 of rotary kiln 1 afterbody is via obtaining superheated vapour behind the waste heat boiler 13; Inhale tower 14 via water curtain dedusting sodium salt again and absorb waste gas such as sulfur in smoke, fluorine, arsenic, make it to be dissolved in and contain the sodium sodium salt aqueous solution, generated the mixing liquid of Sodium sulfhydrate, Sodium Fluoride, Sodium Silicofluoride, sodium arseniate.
The above only is preferred embodiment of the present invention, is not to be the restriction of the present invention being made other form, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But every technical solution of the present invention content that do not break away to any simple modification, equivalent variations and remodeling that above embodiment does, still belongs to the protection domain of technical solution of the present invention according to technical spirit of the present invention.
Claims (4)
1. device that utilizes red mud to produce heating molten steel and byproduct, comprise rotary kiln, described rotary kiln afterbody is provided with exhanst gas outlet, head is provided with discharge port, it is characterized in that: also comprise a diversion trench, described diversion trench afterbody is provided with feeding mouth, head is provided with slag notch, and described feeding mouth is communicated with described discharge port; At described diversion trench head, at least one gas gun is installed, the muzzle of described gas gun is towards blanking place of described diversion trench afterbody; The described feeding mouth while is as the air outlet of diversion trench;
Described diversion trench head downside is provided with the heating molten steel outlet; Described heating molten steel outlet is lower than described slag notch;
The feeding mouth of described diversion trench and the discharge port of described rotary kiln are by the channel connection that is built into by refractory materials;
Different heights place in the described diversion trench afterbody left and right sides is respectively arranged with at least one gas gun, and the muzzle of described gas gun is all towards blanking place of described diversion trench afterbody;
Also comprise the molten stove that divides, stove top was provided with into cinder notch in described molten minute, the described channel connection of slag notch by being built into by refractory materials of going into cinder notch and described diversion trench; Describedly go into cinder notch simultaneously as the molten air outlet of dividing stove.
2. the device that utilizes red mud to produce heating molten steel and byproduct according to claim 1 is characterized in that: the exhanst gas outlet of described rotary kiln is inhaled tower through a waste heat boiler and a water curtain dedusting sodium salt and is communicated with.
3. the device that utilizes red mud to produce heating molten steel and byproduct according to claim 2 is characterized in that: described heating molten steel outlet connection one ladle or a pig-casting machine.
4. the device that utilizes red mud to produce heating molten steel and byproduct according to claim 3 is characterized in that: the stove middle part was provided with cement clinker outlet in described molten minute, and the bottom is provided with silicon titanium aluminum alloy outlet, and the bottom is provided with an outlet at bottom.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102714017A CN102344983B (en) | 2011-09-04 | 2011-09-04 | Device for preparing hot molten iron and byproducts by using red mud |
| PCT/CN2012/079356 WO2013029448A1 (en) | 2011-09-04 | 2012-07-30 | Device for making hot molten iron and by-product by using red mud |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102714017A CN102344983B (en) | 2011-09-04 | 2011-09-04 | Device for preparing hot molten iron and byproducts by using red mud |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102344983A CN102344983A (en) | 2012-02-08 |
| CN102344983B true CN102344983B (en) | 2013-08-28 |
Family
ID=45544054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102714017A Expired - Fee Related CN102344983B (en) | 2011-09-04 | 2011-09-04 | Device for preparing hot molten iron and byproducts by using red mud |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN102344983B (en) |
| WO (1) | WO2013029448A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102344983B (en) * | 2011-09-04 | 2013-08-28 | 胡长春 | Device for preparing hot molten iron and byproducts by using red mud |
| CN102758045A (en) * | 2012-06-02 | 2012-10-31 | 胡长春 | Device for slag-free production using bauxite or red mud |
| RU2619406C2 (en) * | 2014-12-26 | 2017-05-15 | Александр Васильевич Петров | Method for complex processing of red and nepheline sludges |
| CN106673682B (en) * | 2016-12-30 | 2020-03-20 | 钢研晟华工程技术有限公司 | Method for producing ferroalloy and refractory material by using solid wastes |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061350A (en) * | 2011-01-12 | 2011-05-18 | 董亚飞 | Short-process comprehensive red mud utilization method and equipment |
| CN202220184U (en) * | 2011-09-04 | 2012-05-16 | 胡长春 | Device for preparing hot melted iron and byproducts thereof by utilizing red mud |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6764642B2 (en) * | 2001-06-26 | 2004-07-20 | Onahama Smelting And Refining Co., Ltd. | Shredder dust feeding device, reverberatory furnace provided with this feeding device, and furnace for burning shredder dust |
| JP4214157B2 (en) * | 2006-04-25 | 2009-01-28 | 株式会社神戸製鋼所 | Molten iron manufacturing method and molten iron manufacturing apparatus |
| CN201811564U (en) * | 2010-09-15 | 2011-04-27 | 吉林吉恩镍业股份有限公司 | Multi-section high-temperature reducing rotary kiln |
| CN102344983B (en) * | 2011-09-04 | 2013-08-28 | 胡长春 | Device for preparing hot molten iron and byproducts by using red mud |
-
2011
- 2011-09-04 CN CN2011102714017A patent/CN102344983B/en not_active Expired - Fee Related
-
2012
- 2012-07-30 WO PCT/CN2012/079356 patent/WO2013029448A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102061350A (en) * | 2011-01-12 | 2011-05-18 | 董亚飞 | Short-process comprehensive red mud utilization method and equipment |
| CN202220184U (en) * | 2011-09-04 | 2012-05-16 | 胡长春 | Device for preparing hot melted iron and byproducts thereof by utilizing red mud |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013029448A1 (en) | 2013-03-07 |
| CN102344983A (en) | 2012-02-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102344982B (en) | Process for preparing hot molten iron and byproducts by utilizing red mud | |
| CN102321806B (en) | A kind of smelting process of processing zinc leaching residue by oxygen-enriched side-blowing furnace | |
| CN103025900B (en) | A kind of method extracting metallic element from ferro-aluminum Ore, titanium iron ore and residue | |
| CN102732662A (en) | Slag-free production process using bauxite or red mud | |
| CN102399976B (en) | Roasting pretreatment process for extracting vanadium pentoxide from high-carbon scherbinaite-containing coal mine and vanadium pentoxide extracting method | |
| CN112795776B (en) | Method for co-processing waste incineration fly ash and copper-containing sludge | |
| CN103952564B (en) | Copper weld pool Slag treatment method | |
| CN102344983B (en) | Device for preparing hot molten iron and byproducts by using red mud | |
| CN108584994A (en) | A kind of method of lepidolite calcined by rotary kiln lithium carbonate | |
| CN106540525B (en) | A kind of cooperate with stablizes CO in exhaust gas using clinker and waste water2Method and device | |
| CN110029232A (en) | A kind of method of low-grade lead Zinc oxide resource utilization | |
| CN105506292B (en) | A kind of heavy metal sewage sludge harmless treatment and resource utilization method | |
| CN105648210B (en) | In a kind of low heat value vanadium from stone coal vanadium, heat energy, process for extracting vanadium and the method for comprehensive utilization of slag and tailings | |
| CN108842053A (en) | The method of comprehensive utilization of Low grade manganese ore and electrolytic manganese crystallization double salt | |
| CN202220184U (en) | Device for preparing hot melted iron and byproducts thereof by utilizing red mud | |
| CN102766715A (en) | Slag-free production process of ilmenite | |
| CN202610256U (en) | Device utilizing bauxite or red mud for slag-free production | |
| CN106477920A (en) | Nano-structured composite prepared by a kind of utilization dolomite and its preparation method and application | |
| He et al. | Comprehensive utilization of red mud remaining in alumina production | |
| CN110395751A (en) | A method of lithium sulfate is extracted from lepidolite | |
| CN113186367B (en) | Use method of bottom-top composite injection smelting reduction furnace for treating high-iron red mud | |
| CN108516569A (en) | The method that lepidolite roasting prepares lithium sulfate solution | |
| CN105018736A (en) | Method for comprehensive recovery of magnesium, aluminum, chromium and iron in carbon ferrochrome smelting slag | |
| CN102758045A (en) | Device for slag-free production using bauxite or red mud | |
| CN104176753A (en) | Method for extracting composite aluminum oxide from coal ashes |
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: 20130828 Termination date: 20180904 |