CN102994130A - Method for coal blending for coking by high-metamorphic-grade weak caking coal - Google Patents
Method for coal blending for coking by high-metamorphic-grade weak caking coal Download PDFInfo
- Publication number
- CN102994130A CN102994130A CN2012105693676A CN201210569367A CN102994130A CN 102994130 A CN102994130 A CN 102994130A CN 2012105693676 A CN2012105693676 A CN 2012105693676A CN 201210569367 A CN201210569367 A CN 201210569367A CN 102994130 A CN102994130 A CN 102994130A
- Authority
- CN
- China
- Prior art keywords
- coal
- coking
- charge
- grade
- metamorphic grade
- 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.)
- Pending
Links
Landscapes
- Coke Industry (AREA)
Abstract
The invention discloses a method for coal blending for coking by high-metamorphic-grade weak caking coal. The method comprises the following steps of: (1) crushing high-metamorphic-grade coal into different granularity gradients, respectively blending the high-metamorphic-grade coal under each granularity with other caking coals to carry out coking, detecting a quality index of obtained coke and determining the best crushing granularity of the high-metamorphic-grade coal; (2) blending non-high-metamorphic-grade coals in the blended coal and dividing into a coal part 1 and a coal part 2, blending the high-metamorphic-grade coal which is crushed to the best granularity with the coal 1 according to the previous proportion and pressing and molding a coal block, and mixing the high-metamorphic-grade coal which is crushed to the conventional granularity with the coal 2 according to the previous proportion to obtain blended coal 3; and (3) mixing the molded coal block with the blended coal 3 obtained by the step (2) and coking. The method disclosed by the invention can improve the adding amount of the weak caking coal on the premise that the quality of the coke is guaranteed, so that the effects of reasonably utilizing a coal resource and optimizing a coal blending structure are realized.
Description
Technical field
The present invention relates to a kind of coal-blending coking method, especially a kind of high metamorphic grade weak caking coal material participates in the method for coal-blending coking
Background technology
Raising along with the requirement of blast furnace maximization Coke Quality, in the coke making and coal blending strong cohesive property coal charge is depended on unduly and high-quality caking coal resource reserve contradiction in short supply, under the prerequisite that guarantees the blast-furnace coke quality, open up new coal charge preconditioning technique, rationally utilize the coking of weak caking coal material, the important channel that become the coking industry optimizing blending plan, reduces the coking cost, saves coking coal resource.The pre-treatment of coal charge comprises raising shove charge dump density and regulation and control coal charge granularity two aspects, in order to improve coke quality, increase the amount of allocating into of weak caking coal, usually the coke-oven plant all regulates and control the coking coal materials granularity according to the suitable technique of the characteristics utilization of self aborning, mainly comprises and joins first rear powder craft and have the coal charge of particular requirement and component to carry out independent disintegrating process to granularity; Formerly join the difficult pulverizing of high metamorphic grade weak caking coal material in the rear powder craft, particle is larger, and segregation occurs in loading furnace process easily, causes active ingredient and inert component incomplete mixing, the deteriorated coke quality such as cracks easily in the Semicoke Contraction process.If have the coal charge of particular requirement and component to pulverize separately and adopt to granularity, although coal charge can be crushed under the needed size-grade distribution of optimum coking property, but to suiting under fine granularity, to participate in the high metamorphic grade coal charge of coking, after fine powder is broken, cooperate in the coal charge Bed for Fine Coal content to increase and to cause the shove charge difficulty, and produce serious environmental issue, so just high metamorphic grade coal charge is carried out simple precomminution in usually producing, this pretreatment technology Coke Quality to improve effect less, therefore, in coal-blending coking, generally the consumption with high metamorphic grade weak caking coal material is controlled at lower scope, causes coal blending cost to maintain higher level always.
Summary of the invention
The technical problem to be solved in the present invention provides the method that the high high metamorphic grade weak caking coal material of a kind of coke quality participates in coal-blending coking.
For solving the problems of the technologies described above, method that the present invention takes is: (1) determines best grinding particle size: the high metamorphic grade coal charge in the mixed coal of known coal charge proportioning is crushed to the different grain size gradient, with the high metamorphic grade coal charge under each granularity respectively with former proportioning in other agglutinating value(of coal) coal charges by proper mass than cooperating coking, detect the quality index of gained coke, determine that the granularity of high metamorphic grade coal charge corresponding when the coke quality index is best is its best grinding particle size; The G value of described mixed coal should be greater than 65;
(2) preparation moulded coal and fine coal: after the non-high metamorphic grade coal charge cooperation in the mixed coal, minute coal-forming 1 and coal 2 two portions; The high metamorphic grade coal charge that carefully is crushed to behind the optimum size is cooperated with coal 1 and the compression moulding coal cinder by former proportioning; The high metamorphic grade coal charge that is crushed to regular particle size is mixed into mixed coal 3 by former proportioning and coal 2;
(3) cooperate coking: with described coal charge 3 mixed cokings that cooperate of above-mentioned moulded coal piece and step (2).
The mass ratio of coal 1 and coal 2 is 3:7 in the step of the present invention (2).
The grinding particle size gradient of high metamorphic grade coal charge is respectively in the step of the present invention (1): under 3mm, 1mm, 0.5mm, 0.2mm, 0.1mm and the 0.074mm.
The moisture content of the medium-sized coal slime material of step of the present invention (2) is controlled to be 7～8wt%.
The granularity of other agglutinating value(of coal) coal charges in the proportioning of step of the present invention (1) Central Plains is that particle diameter＜3mm accounts for more than 75% of mixed coal.
The beneficial effect that adopts technique scheme to produce is: when thinking that according to mechanism of coke formation cooperation coal charge agglutinating value(of coal) is sufficient, the suitably broken high metamorphic grade coal charge of fine powder coking, the inert component granularity is controlled under the suitable particle diameter, and even with Active components distribution, reduce the coke crackle, improve coke quality; The present invention adopts high metamorphic grade coal charge precomminution technology, and by the difficult problem of the coal charge after fine powder is broken with mixed coal coldmoulding solution fine granularity coal charge shove charge difficulty, can improve coke quality when the high metamorphic grade weak caking coal material amount of allocating into is constant; Under the prerequisite that guarantees coke quality, can improve the amount of allocating into of weak caking coal material, can play the effect that rationally utilizes coal resource, optimizing blending plan.Processing condition of the present invention are simple, are particularly useful for coking industry.
Embodiment
The present invention is further detailed explanation below in conjunction with specific embodiment.
The first step: the best grinding particle size of determining coal charge:
(1) pulverizing of regular particle size coal charge: utilize hammer mill that the non-high metamorphic grade coal charge in the coal charge of known proportioning partly is crushed to fineness more than 75.
(2) fine powder of high metamorphic grade weak caking coal material is broken: use round hole sieve corresponding to particle diameter of studying to sieve behind 50 ℃ of lower forced air drying 2h of constant temperature in baking oven coal sample, screen overflow is pulverized, coal charge after the fragmentation is sieved again, getting screen overflow continues to pulverize, until coal charge all passes through round hole sieve corresponding to grade studied, with the coal sample screening after pulverizing, investigate the size composition of coal charge, guarantee concentrated being distributed between the grade and next grade of studying of coal charge.The fragmentation of all grades between 3～0.5mm all utilizes double roll crusher broken step by step.0.2mm, 0.1mm and three grades of 0.074mm control by grinding time and the coal-grinding amount of adjusting vibration mill, the each coal-grinding 150g of 0.2mm grade is about each 10s; 0.1mm the each coal-grinding 150g of grade is about each 16s; 0.074mm the each coal-grinding 150g of grade is about each 20s.
(3) determining of the best grinding particle size of coal charge: described non-high metamorphic grade coal charge respectively with precomminution after high metamorphic grade weak caking coal material under each granularity mix by former butt mass ratio, control moisture is got the coking in the 40kg small coke oven of packing into of the mixed coal charge of 35kg about 10%.The hot performance of contrast coke is determined best grinding particle size.
Second step: fine coal preparation and fine powder broken coal material are joined moulded coal:
(1) coal 1 and coal 2 and preparation: by former proportioning, utilize hammer mill carefully to be crushed to fineness more than 75 after non-high metamorphic grade coal charge mixed, be divided in mass ratio coal 1 and coal 2 two portions of 3:7;
(2) preparation of coal 3: the high metamorphic grade coal charge that will be crushed to regular particle size by former proportioning makes coal 3 with cooperating coal charge 2 mixing;
(3) preparation of moulded coal coal charge: the high metamorphic grade coal charge after by former proportioning that fine powder is broken mixes with cooperating coal charge 1, makes the moulded coal pug that moisture content is controlled to be 7～8wt%;
(4) compacting of moulded coal: above-mentioned moulded coal pug is delivered in the forming machine, be cold-pressed into the moulded coal piece of desired shape;
The 3rd step: cooperate coking:
Above-mentioned moulded coal piece and coal 3 are mixed coking, detect the quality index of gained coke, determine the variation of the high metamorphic grade coal charge of coke quality index contrast pre-treatment coking front and back coke quality.
Embodiment 1:
(1) determine the best grinding particle size of coal charge: the hot performance of coking sees Table 1 under high metamorphic grade coal charge (lean coal) different grain size.
Table 1: the hot performance of coking under the high metamorphic grade coal charge different grain size
By the CRI of table 1 and CSR as seen, the best grinding particle size of lean coal is 0.1mm under this proportioning.
(2) compacting of moulded coal: cooperate the proportioning of coal charge to see Table 2.
Table 2: the proportioning (% by weight) that cooperates coal charge
| Coal sample | 1/3 coking coal | Coking coal | Rich coal | Lean coal |
| Coal 1 proportioning | 21.5 | 60.2 | 18.3 | - |
| Coal 3 proportionings | 20 | 56 | 17 | 7 |
Mix 0.74kg carefully be crushed to lean coal and the 9.76kg coal 1 of 0.1mm, coldmoulding, the cooperation coal charge of getting the 24.5kg regular particle size mixes rear coking with moulded coal.The reactivity of coke (CRI): 29.8, the post-reaction strength of coke (CSR): 54.9.Contrast scheme 1 coke quality obviously improves.
Embodiment 2:
(1) determine the best grinding particle size of coal charge: the hot performance of coking sees Table 3 under high metamorphic grade coal charge (hard coal) different grain size.
Table 3: the hot performance of coking under the high metamorphic grade coal charge different grain size
By the CRI of table 3 and CSR as seen, anthracitic best grinding particle size is 0.2mm under this proportioning.
(2) compacting of moulded coal: cooperate the proportioning of coal charge to see Table 4.
Table 4: the proportioning (% by weight) that cooperates coal charge
| Coal sample | 1/3 coking coal | Coking coal | Rich coal | Hard coal |
| Coal 1 proportioning | 21.5 | 60.2 | 18.3 | - |
| Coal 3 proportionings | 20 | 56 | 17 | 7 |
Mix 0.74kg carefully be crushed to hard coal and the 9.76kg coal 1 of 0.1mm, coldmoulding, the cooperation coal charge of getting the 24.5kg regular particle size mixes rear coking with moulded coal.The reactivity of coke (CRI): 29.8, the post-reaction strength of coke (CSR): 53.3.Contrast scheme 1 coke quality obviously improves.
Embodiment 3:
(1) determine the best grinding particle size of coal charge: the hot performance of coking sees Table 5 under high metamorphic grade coal charge (lean coal) different grain size.
Table 5: the hot performance of coking under the high metamorphic grade coal charge different grain size
By the CRI of table 5 and CSR as seen, the best grinding particle size of lean coal is 0.2mm under this proportioning.
(2) compacting of moulded coal: cooperate the proportioning of coal charge to see Table 6.
Table 6: the proportioning (% by weight) that cooperates coal charge
| Coal sample | 1/3 coking coal | Coking coal | Rich coal | Lean coal |
| Coal 1 proportioning | 25.2 | 59.4 | 15.4 | - |
| Coal 3 proportionings | 23 | 54 | 14 | 9 |
Mix 0.95kg carefully be crushed to hard coal and the 9.55kg coal 1 of 0.1mm, coldmoulding, the cooperation coal charge of getting the 24.5kg regular particle size mixes rear coking with moulded coal.The reactivity of coke (CRI): 29.2, the post-reaction strength of coke (CSR): 55.1.Contrast scheme 1 coke quality obviously improves.
Embodiment 4:
(1) determine the best grinding particle size of coal charge: the hot performance of coking sees Table 7 under high metamorphic grade coal charge (hard coal) different grain size.
Table 7: the hot performance of coking under the high metamorphic grade coal charge different grain size
By the CRI of table 7 and CSR as seen, anthracitic best grinding particle size is 0.5mm under this proportioning.
(2) compacting of moulded coal: cooperate the proportioning of coal charge to see Table 8.
Table 8: the proportioning (weight) that cooperates coal charge
| Coal sample | 1/3 coking coal | Coking coal | Rich coal | Hard coal |
| Coal 1 proportioning | 25.2 | 59.4 | 15.4 | - |
| Coal 3 proportionings | 23 | 54 | 14 | 9 |
Mix 0.95kg carefully be crushed to hard coal and the 9.55kg coal 1 of 0.1mm, coldmoulding, the cooperation coal charge of getting the 24.5kg regular particle size mixes rear coking with moulded coal.The reactivity of coke (CRI): 30.7, the post-reaction strength of coke (CSR): 51.8.Contrast scheme 1 coke quality obviously improves.
Above-described embodiment gained coke is not all adopting under the condition of any binding agent, and the 40kg small coke oven makes in the laboratory.
Claims (5)
1. one kind high metamorphic grade weak caking coal material participates in the method for coal-blending coking, it is characterized in that, the method is: (1) determines best grinding particle size: the high metamorphic grade coal charge in the mixed coal of known coal charge proportioning is crushed to the different grain size gradient, with the high metamorphic grade coal charge under each granularity respectively with former proportioning in other agglutinating value(of coal) coal charges by proper mass than cooperating coking, detect the quality index of gained coke, determine that the granularity of high metamorphic grade coal charge corresponding when the coke quality index is best is its best grinding particle size; The G value of described mixed coal should be greater than 65;
(2) preparation moulded coal and fine coal: after the non-high metamorphic grade coal charge cooperation in the mixed coal, minute coal-forming 1 and coal 2 two portions; The high metamorphic grade coal charge that carefully is crushed to behind the optimum size is cooperated with coal 1 and the compression moulding coal cinder by former proportioning; The high metamorphic grade coal charge that is crushed to regular particle size is mixed into mixed coal 3 by former proportioning and coal 2;
(3) cooperate coking: with described coal charge 3 mixed cokings that cooperate of above-mentioned moulded coal piece and step (2).
2. a kind of high metamorphic grade weak caking coal material according to claim 1 participates in the method for coal-blending coking, and it is characterized in that: the mass ratio of coal 1 and coal 2 is 3:7 in the described step (2).
3. a kind of high metamorphic grade weak caking coal material according to claim 1 participates in the method for coal-blending coking, and it is characterized in that: the grinding particle size gradient of high metamorphic grade coal charge is respectively in the described step (1): under 3mm, 1mm, 0.5mm, 0.2mm, 0.1mm and the 0.074mm.
4. a kind of high metamorphic grade weak caking coal material according to claim 1 participates in the method for coal-blending coking, and it is characterized in that: the moisture content of the medium-sized coal slime material of described step (2) is controlled to be 7～8wt%.
5. according to claim 1,2 or 3 described a kind of high metamorphic grade weak caking coal material participate in the method for coal-blending cokings, it is characterized in that: the granularity of other agglutinating value(of coal) coal charges in the proportioning of described step (1) Central Plains is that particle diameter＜3mm accounts for more than 75% of mixed coal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105693676A CN102994130A (en) | 2012-12-25 | 2012-12-25 | Method for coal blending for coking by high-metamorphic-grade weak caking coal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012105693676A CN102994130A (en) | 2012-12-25 | 2012-12-25 | Method for coal blending for coking by high-metamorphic-grade weak caking coal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102994130A true CN102994130A (en) | 2013-03-27 |
Family
ID=47923248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012105693676A Pending CN102994130A (en) | 2012-12-25 | 2012-12-25 | Method for coal blending for coking by high-metamorphic-grade weak caking coal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102994130A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104140832A (en) * | 2013-05-10 | 2014-11-12 | 山东钢铁集团日照有限公司 | Technology for improving quality stability of coking charge coal |
| CN104330542A (en) * | 2014-11-10 | 2015-02-04 | 武汉钢铁(集团)公司 | Coal quality evaluating method and distributing method of highly-metamorphic coking coal based on coke optical texture structure |
| CN104910943A (en) * | 2015-05-25 | 2015-09-16 | 武汉钢铁(集团)公司 | Particle size controlling method under waterless coal loading conditions |
| CN104927888A (en) * | 2015-05-26 | 2015-09-23 | 武汉钢铁(集团)公司 | Method for determining coking coal fired coal granularity control point |
| CN105670669A (en) * | 2016-03-09 | 2016-06-15 | 宁波钢铁有限公司 | Double-line coal blending method for preventing coke strength from deterioration |
| CN105925294A (en) * | 2016-05-16 | 2016-09-07 | 武汉钢铁股份有限公司 | Control method for coke particle size uniformity |
| CN107513394A (en) * | 2016-06-15 | 2017-12-26 | 宝山钢铁股份有限公司 | Improve highly expanded strong cohesive property high volatile coal coking performance methodology |
| CN111253961A (en) * | 2020-01-21 | 2020-06-09 | 鞍钢股份有限公司 | Coking coal blending method for improving average particle size of coke and improving particle size distribution of coke |
| CN111308042A (en) * | 2020-02-26 | 2020-06-19 | 武汉科技大学 | Coking and coal blending method |
| CN113462419A (en) * | 2021-06-30 | 2021-10-01 | 武汉钢铁有限公司 | Blending method of low-volatile-component weak-caking bituminous coal |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699266A (en) * | 2009-11-03 | 2010-04-28 | 武汉钢铁(集团)公司 | Method for determining optimal granularity of meager lean coal with caking index G of larger than 5-10 |
-
2012
- 2012-12-25 CN CN2012105693676A patent/CN102994130A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101699266A (en) * | 2009-11-03 | 2010-04-28 | 武汉钢铁(集团)公司 | Method for determining optimal granularity of meager lean coal with caking index G of larger than 5-10 |
Non-Patent Citations (2)
| Title |
|---|
| 19921130 张忠兵 成型煤炼焦新工艺探讨 第58-62页 1-5 第15卷, 第4期 * |
| 张忠兵: "成型煤炼焦新工艺探讨", <煤炭转化> * |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104140832A (en) * | 2013-05-10 | 2014-11-12 | 山东钢铁集团日照有限公司 | Technology for improving quality stability of coking charge coal |
| CN104330542B (en) * | 2014-11-10 | 2016-04-20 | 武汉钢铁(集团)公司 | Height based on charred coal organization structure goes bad the coal property evaluation of coking coal and application method |
| CN104330542A (en) * | 2014-11-10 | 2015-02-04 | 武汉钢铁(集团)公司 | Coal quality evaluating method and distributing method of highly-metamorphic coking coal based on coke optical texture structure |
| CN104910943B (en) * | 2015-05-25 | 2017-07-21 | 武汉钢铁(集团)公司 | Task-size Controlling method under anhydrous loading condition |
| CN104910943A (en) * | 2015-05-25 | 2015-09-16 | 武汉钢铁(集团)公司 | Particle size controlling method under waterless coal loading conditions |
| CN104927888A (en) * | 2015-05-26 | 2015-09-23 | 武汉钢铁(集团)公司 | Method for determining coking coal fired coal granularity control point |
| CN104927888B (en) * | 2015-05-26 | 2017-06-06 | 武汉钢铁(集团)公司 | The determination method of coking coal as-fired coal Task-size Controlling point |
| CN105670669A (en) * | 2016-03-09 | 2016-06-15 | 宁波钢铁有限公司 | Double-line coal blending method for preventing coke strength from deterioration |
| CN105925294B (en) * | 2016-05-16 | 2019-04-02 | 武汉钢铁有限公司 | The control method of coke size uniformity |
| CN105925294A (en) * | 2016-05-16 | 2016-09-07 | 武汉钢铁股份有限公司 | Control method for coke particle size uniformity |
| CN107513394A (en) * | 2016-06-15 | 2017-12-26 | 宝山钢铁股份有限公司 | Improve highly expanded strong cohesive property high volatile coal coking performance methodology |
| CN107513394B (en) * | 2016-06-15 | 2020-06-23 | 宝山钢铁股份有限公司 | Method for improving coking performance of high-expansion strong-caking high-volatile coal |
| CN111253961A (en) * | 2020-01-21 | 2020-06-09 | 鞍钢股份有限公司 | Coking coal blending method for improving average particle size of coke and improving particle size distribution of coke |
| CN111253961B (en) * | 2020-01-21 | 2021-05-28 | 鞍钢股份有限公司 | Coking coal blending method for improving average particle size of coke and improving particle size distribution of coke |
| CN111308042A (en) * | 2020-02-26 | 2020-06-19 | 武汉科技大学 | Coking and coal blending method |
| CN111308042B (en) * | 2020-02-26 | 2022-04-15 | 武汉科技大学 | Coking and coal blending method |
| CN113462419A (en) * | 2021-06-30 | 2021-10-01 | 武汉钢铁有限公司 | Blending method of low-volatile-component weak-caking bituminous coal |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102994130A (en) | Method for coal blending for coking by high-metamorphic-grade weak caking coal | |
| CN101928824B (en) | Sinter production method for reducing sintering solid burnup and enhancing intensity | |
| CN101870875B (en) | Method for producing metallurgical coke from 1/3 coking coal and non-coking coal | |
| CN101880541B (en) | Method for producing primary metallurgical coke by using 1/3 charred coal in west Mongolia region as main blending coal | |
| CN110776942B (en) | Method for producing metallurgical coke by using non-sticky coal | |
| CN104087328A (en) | Coke oven coking method for improving ratio of long flame coal for chemical coke | |
| CN111020178A (en) | Comprehensive sintering method of large-proportion limonite | |
| CN1952041A (en) | First grade metallurgical coke produced from ordinary coking coal and its production method | |
| CN102618311B (en) | Coking and coal blending method with participation of fat coal | |
| CN104140833A (en) | Coal-blending and coke-making method involved with low G value 1/3 coking coal | |
| CN105331381B (en) | A kind of coke making and coal blending method | |
| CN101994002B (en) | Method for sintering ore blending of Jianshan concentrate fines and limonite | |
| CN103740391A (en) | Method of coal blending for coking by steam coal pretreatment | |
| CN103114198A (en) | Method for utilizing nickel flash smelting water-quenched slag | |
| CN101531908B (en) | Novel process for coal-blending and coking of kilkenny coal in vast scale | |
| CN110982548A (en) | Coal preparation method for coking coal material | |
| CN212687965U (en) | Coke production device | |
| CN105483369A (en) | Mixture preparation method for improving sintering capacity | |
| CN104140836A (en) | Coal blending and coking method with low-flow high-expansion low-shrinkage-degree coking coal involved | |
| CN103965929A (en) | Method for increasing use amount of high-volatile non-caking bituminous coal during coking process | |
| CN103756699A (en) | Blended coal for producing foundry coke and production method of foundry coke | |
| CN102952601B (en) | Binder for pressure gasification briquettes | |
| CN102965171B (en) | Binder special for coal briquette for Lurgi pressurized gasification | |
| RU2444556C1 (en) | Coal charge for coking | |
| RU2445342C1 (en) | Method of preparing coal charge for coking |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130327 |