CN103452586A - Gob expanding material prestressed filling method and prestressed filling material - Google Patents
Gob expanding material prestressed filling method and prestressed filling material Download PDFInfo
- Publication number
- CN103452586A CN103452586A CN2013103809668A CN201310380966A CN103452586A CN 103452586 A CN103452586 A CN 103452586A CN 2013103809668 A CN2013103809668 A CN 2013103809668A CN 201310380966 A CN201310380966 A CN 201310380966A CN 103452586 A CN103452586 A CN 103452586A
- Authority
- CN
- China
- Prior art keywords
- filling
- prestressing force
- prestressed
- goaf
- filler
- 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
Images
Abstract
The invention relates to the field of mining. A gob expanding material prestressed filling method is characterized by comprising the following steps of (1) preparing a prestressed filling material, i.e. stirring and blending the following raw materials in percentage by mass, 20 to 80 percent of burnt lime powder, 20 to 50 percent of water, 0 to 60 percent of filling aggregate and 0 to 5 percent of additive, to obtain the prestressed filling material; (2) according to the actual needs of a mine, on the basis that all the prestressed filling material or a part of filling material which is originally used by the mine is filled into a gob, filling the prestressed filling material into the gob through a filling pipe until the prestressed filling material reaches the top of the gob. After the prestressed filling material enters the gob for a certain time, the volume of the prestressed filling material is expanded; after the whole gob is fully filled, the prestressed filling material applies certain pre-stress to the surrounding rock mass. The problem that the mine is difficultly filled to the top is solved by the method and the filling material, the deformation and displacement of the surrounding rock mass are fully restrained, the stress distribution of the surrounding rock is improved, and a good condition for deep mining and the mining in a complex ground stress environment is also created.
Description
Technical field
The present invention relates to field of mining, be specially method and the prestressing force filler thereof of a kind of goaf expanding material prestressing force filling.
Background technology
After underground mineral resources is plucked out of, the virgin stress equilibrium state of production zone surrounding rock body is damaged, stress redistributes the balance that reaches new, rock stratum and earth's surface produce movement and deformation and noncontinuity is destroyed, building, water body, arable land, railway, bridge that causes earth's surface etc. is damaged, and natural environment and the ecological environment on earth's surface caused to huge harmful effect.In recent years, the raising of people's environmental protection ideas makes the series of problems that causes earth's surface generation depression to cause because of underground mining obtain extensive concern.The technical measures that weaken at present overburden deformation and subsidence mainly contain to stay establishes protection ore pillar method, partial mining method, Mao Gan space, goaf grouting filling method, overlying strata separation layer district slip casting method and filling method.Wherein filling method owing to thering is higher ore recovery ratio, can effectively press and distortion and the displacement of goaf periphery rock mass with controlling, take full advantage of the advantages such as exploitation discarded object, be that the important component part of green exploitation more and more comes into one's own.
The development experience dry stowing of China's filling technique, hydraulic filling and the consolidated fill for gathering materials such as classification tail sand, river sand, the husky highly concentrated cemented fill of full tail, high-moisture quick-setting filling and piece stone consolidated fill and lotion, paste-like backfill.Be subject to impact and the restriction of the many factors such as fund, working condition, the cementitious material major part that the current mine of China adopts is cement, flyash or plural gel agent etc., and cementitious material used does not have the volume expansion performance.
In stowing operation owing to being subject to the filling slurry gravity flow gradient, the bleeding of filling slurry, the impact of the multiple factors such as irregular of the natural subsidence of obturation and mineral building top board, obturation is difficult to fully connect top always, usually leave the space of tens centimetres to several meters, obturation is failed to connect top and is caused obturation to fail to give full play to the effect of self, country rock produces distortion and moves and fail to be effectively controlled, press frequent activity with causing, the wall caving inbreak is serious, bring great difficulty to Mine Safety in Production, especially in the activity of multi-step underground mining, because goaf can not connect top, cause that to adopt cut journey difficulty of construction large, the resource depletion loss is large, safety in production is subject to great threat.The mining personnel improve filling by the several different methods such as improvement of production process and means and connect the top rate, but to connect every objective factor on top more owing to affecting filling, and current done effort only can improve filling and connect the top effect, but fails to solve fully filling and connects the top problem.It is that the most difficult control is also a most important technology difficult problem (as shown in Figure 1) that the filling in the filling mining process of visible mine connects top.
Nowadays the fast development of China's economy, demand to mineral resources is increasing, but through exploitation for many years, earth's surface is easily adopted resource and has been approached exhausted, people's sight has to turn to darker underground or some difficult ore bodies of employing, because filling does not connect the top problem, people are difficult to effectively to control displacement and the distortion of ore body periphery rock mass, and how scientificlly and effectively solving filling, to connect top be the problem that China getter author faces.
In addition, along with the layout of China's high-rise building and critical facility is more and more denser, especially high-speed railway, speedway is crisscross, and a lot of zones have proposed strict demand to surface settlement.This has also proposed the technology proposition of higher control depression to underground mining engineering.
Summary of the invention
The method and the prestressing force filler thereof that the purpose of this invention is to provide the expanding material prestressing force filling of a kind of goaf, the method and filler thereof have not only solved filling in mine and have connect a top difficult problem, fully distortion and the displacement of the peripheral rock mass of restriction, improve the stress distribution of country rock, also for the exploitation under deep mining and complicated field stress environment, create good condition.
To achieve these goals, the technical solution used in the present invention is: the method for a kind of goaf expanding material prestressing force filling is characterized in that it comprises the steps:
1) preparation of prestressing force filler: be by the shared mass percent of each raw material: burning calcium oxide powder 20%～80%, water 20%～50%, filling aggregate 0%～60% and 0%～5% additive, the shared mass percent sum of each raw material is 100%, chooses burning calcium oxide powder (as cementitious material), water, filling aggregate and additive; Burning calcium oxide powder, water, filling aggregate and additive are stirred to the companion and mix, obtain the prestressing force filler;
2) mine according to actual needs, all be filled with the prestressing force filler or in goaf on the basis that is filled with the original filler used in part mine, the prestressing force filler is filled with to goaf by filling pipe (being conveyance conduit), until the top in goaf; After the prestressing force filler enters the goaf certain hour, volume expands, and after being filled with whole goaf, can produce to peripheral rock mass certain prestressing force.
Described filling aggregate is Sha, river, mountain sand, lake sand, extra large sand, rod milling sand, wind sand, impacts the mixing of wherein one or more such as sand, mine tailing by any proportioning.
Described additive is water reducing agent, antifreezing agent or early strength admixture.
Realize the prestressing force filler of said method, it is characterized in that it is mixed by burning calcium oxide powder, water, filling aggregate and additive, the shared mass percent of each raw material is: burning calcium oxide powder 20%～80%, water 20%～50%, filling aggregate 0%～60% and 0%～5% additive, the shared mass percent sum of each raw material is 100%.
The shared mass percent the best of described each raw material is: burning calcium oxide powder 37.5%～50%, water 25%, filling aggregate 25%～37.5%.
The burning calcium oxide with become calcium hydroxide after water reacts, produce volume expansion simultaneously.Because the volume of burning calcium oxide is fine and close and the calcium hydroxide molecular volume becomes large cause, it can be on the basis of former calcium oxide powder volume expansion 3-5 times, and thereupon fixed.Under wet condition, fixed calcium hydroxide can with airborne carbon dioxide generation reduction reaction, slowly be reduced to calcium carbonate, i.e. limestone, its volumetric change of this process is little.But this reduction process is very slow.
Cementitious material used in the present invention is burning calcium oxide powder, or adds burning calcium oxide powder in other cementitious material.After this material and hydrate, meeting generation volume expansion realization and country rock connect top.
The present invention solves filling in mine to connect a top difficult problem, and connect on the basis on top in the solution filling, filler produces certain prestressing force to peripheral rock mass, prestressing force filling concept is proposed, this filling method can effectively control country rock displacement, improve ore pillar intensity, improve the down-hole stress distribution, effectively improve the working condition at deep and stress complex condition.
The invention has the beneficial effects as follows:
(1) solve filling in mine and connect a top difficult problem, burning calcium oxide and filling aggregate, water, additive are filled with goaf after stirring the companion, volume expansion after the burning calcium oxide reacts with water, and the filler volume increases, be filled with gradually whole goaf, fully limit distortion and the displacement of peripheral rock mass.
(2) expanding volume of obturation is subject to the restriction of goaf bulk, limitedly rear peripheral rock mass is produced to certain prestressing force expanding, and this prestress force not only can improve the intensity of ore pillar, and can effectively improve the stress distribution in rock mass.
(3) solve the obturation Problem of Failure, the burning calcium oxide react generation calcium hydroxide afterwards with water, under wet condition, fixed calcium hydroxide can with airborne carbon dioxide generation reduction reaction, slowly be reduced to calcium carbonate, i.e. limestone.The environment of down-hole humidity just in time meets this requirement.Time is more of a specified duration, and the intensity of obturation is larger, does not have Problem of Failure.
(4) conventional cementitious material, especially some chemically composited gellings, ointment material outflows with water and can cause lithic drainage to pollute in stowing operation.And lime is good disinfectant for purifying water, even having, expansion glue gel material of the present invention is lost on a small quantity in water body, also belong to environment-friendly function.
The accompanying drawing explanation
Fig. 1 is the schematic diagram of existing goaf filling method.
Fig. 2 is the schematic diagram of goaf filling process of the present invention.
Fig. 3 is the schematic diagram after goaf filling of the present invention completely.
Fig. 4 is process chart of the present invention.
In figure: 1-country rock, 2-filling pipe, 3-goaf, the former filler of 4-, 5-prestressing force filler.
The specific embodiment
In order to understand better the present invention, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
Embodiment 1:
The method of a kind of goaf expanding material prestressing force filling, it comprises the steps:
1) preparation of prestressing force filler: be by the shared mass percent of each raw material: burning calcium oxide powder 37.5%, water 25%, filling aggregate 37.5%, choose burning calcium oxide powder (as cementitious material), water and filling aggregate; Burning calcium oxide powder, water and filling aggregate are stirred to the companion and mix, obtain the prestressing force filler;
Described filling aggregate is river sand.
2) mine according to actual needs, on the basis that is filled with the original filler used in part mine, is filled with goaf by the prestressing force filler by filling pipe (being conveyance conduit), until the top in goaf; After the prestressing force filler enters the goaf certain hour, volume expands, and after being filled with whole goaf, can produce to peripheral rock mass certain prestressing force.
The volume in goaf is 100, and the concentration of prestressing force filler is 75%, and during filling, the volume of prestressing force filler is 25, and expanding volume is 50～55; Former filler 4 accounts for goaf volume 70%, and the stress filler enters goaf approximately after 1.8 hours, is filled with whole goaf, and the prestressing force P that can produce peripheral rock mass be about 1.4Mpa.
The method and filler thereof have not only solved filling in mine and have connect a top difficult problem, fully limit distortion and the displacement of peripheral rock mass, improve the stress distribution of country rock, also for the exploitation under deep mining and complicated field stress environment, create good condition.
Embodiment 2:
The method of a kind of goaf expanding material prestressing force filling, it comprises the steps:
1) preparation of prestressing force filler: be by the shared mass percent of each raw material: burning calcium oxide powder 50%, water 25%, filling aggregate 25%, choose burning calcium oxide powder (as cementitious material), water and filling aggregate; Burning calcium oxide powder, water and filling aggregate are stirred to the companion and mix, obtain the prestressing force filler;
Described filling aggregate is river sand.
2) mine according to actual needs, on the basis that is filled with the original filler used in part mine, is filled with goaf by the prestressing force filler by filling pipe (being conveyance conduit), until the top in goaf; After the prestressing force filler enters the goaf certain hour, volume expands, and after being filled with whole goaf, can produce to peripheral rock mass certain prestressing force.
The volume in goaf is 100, and the concentration of prestressing force filler is 75%, and during filling, the volume of prestressing force filler is 25, and expanding volume is 70～80; Former filler 4 accounts for goaf volume 70%, and the stress filler enters goaf approximately after 1.7 hours, is filled with whole goaf, and the prestressing force P that can produce peripheral rock mass be about 2.5Mpa.
The method and filler thereof have not only solved filling in mine and have connect a top difficult problem, fully limit distortion and the displacement of peripheral rock mass, improve the stress distribution of country rock, also for the exploitation under deep mining and complicated field stress environment, create good condition.
Embodiment 3:
The method of a kind of goaf expanding material prestressing force filling, it comprises the steps:
1) preparation of prestressing force filler: be by the shared mass percent of each raw material: burning calcium oxide powder 37.5%, water 25%, filling aggregate 37% and 0.5% additive, choose burning calcium oxide powder (as cementitious material), water, filling aggregate and additive; By burning calcium oxide powder, water, fill and add aggregate and additive and stir the companion and mix, obtain the prestressing force filler;
Described filling aggregate is river sand
Described additive is naphthalene series high-efficiency water-reducing agent.
2) mine according to actual needs, all is filled with the prestressing force filler in goaf, the prestressing force filler is filled with to goaf by filling pipe (being conveyance conduit), until the top in goaf; After the prestressing force filler enters the goaf certain hour, volume expands, and after being filled with whole goaf, can produce to peripheral rock mass certain prestressing force.
The volume in goaf is 100, and the concentration of prestressing force filler is 75%, and during filling, the volume of prestressing force filler is 25, and expanding volume is 65～75; Former filler 4 accounts for goaf volume 70%, and the stress filler enters goaf approximately after 1.6 hours, is filled with whole goaf, and the prestressing force P that can produce peripheral rock mass be about 2.5～3Mpa.
In filling in mine, in order to strengthen the mobility of filler, can add water reducing agent, in order to strengthen the early strength of filler, can add early strength admixture, can add antifreezing agent when temperature is lower than 5 ℃ in the winter time, but one or more mixing of these additives are used.
The method and filler thereof have not only solved filling in mine and have connect a top difficult problem, fully limit distortion and the displacement of peripheral rock mass, improve the stress distribution of country rock, also for the exploitation under deep mining and complicated field stress environment, create good condition.
Claims (6)
1. the method for a goaf expanding material prestressing force filling, is characterized in that it comprises the steps:
1) preparation of prestressing force filler: be by the shared mass percent of each raw material: burning calcium oxide powder 20%～80%, water 20%～50%, filling aggregate 0%～60% and 0%～5% additive, the shared mass percent sum of each raw material is 100%, chooses burning calcium oxide powder, water, filling aggregate and additive; Burning calcium oxide powder, water, filling aggregate and additive are stirred to the companion and mix, obtain the prestressing force filler;
2) mine according to actual needs, all is filled with the prestressing force filler or, on the basis that is filled with the original filler used in part mine, the prestressing force filler is filled with to goaf by filling pipe, until the top in goaf in goaf.
2. the method for a kind of goaf expanding material prestressing force filling according to claim 1, it is characterized in that: the shared mass percent of described each raw material is: burning calcium oxide powder 37.5%～50%, water 25%, filling aggregate 25%～37.5%.
3. the method for a kind of goaf expanding material prestressing force filling according to claim 1 is characterized in that: described filling aggregate is Sha, river, mountain sand, lake sand, extra large sand, rod milling sand, wind sand, impacts one or more mixing by any proportioning in sand, mine tailing.
4. the method for a kind of goaf expanding material prestressing force filling according to claim 1, it is characterized in that: described additive is water reducing agent, antifreezing agent or early strength admixture.
5. realize the prestressing force filler of the described method of claim 1, it is characterized in that it is mixed by burning calcium oxide powder, water, filling aggregate and additive, the shared mass percent of each raw material is: burning calcium oxide powder 20%～80%, water 20%～50%, filling aggregate 0%～60% and 0%～5% additive, the shared mass percent sum of each raw material is 100%.
6. prestressing force filler according to claim 5, it is characterized in that: the shared mass percent of described each raw material is: burning calcium oxide powder 37.5%～50%, water 25%, filling aggregate 25%～37.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103809668A CN103452586A (en) | 2013-08-28 | 2013-08-28 | Gob expanding material prestressed filling method and prestressed filling material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103809668A CN103452586A (en) | 2013-08-28 | 2013-08-28 | Gob expanding material prestressed filling method and prestressed filling material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103452586A true CN103452586A (en) | 2013-12-18 |
Family
ID=49735369
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013103809668A Pending CN103452586A (en) | 2013-08-28 | 2013-08-28 | Gob expanding material prestressed filling method and prestressed filling material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103452586A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105240017A (en) * | 2015-11-23 | 2016-01-13 | 武汉理工大学 | Block-shaped cutting, jacking and pushing ore removal mining method of double-layer extreme-thin jade mine |
| CN105422146A (en) * | 2015-12-15 | 2016-03-23 | 东北大学 | Underground stope artificial pillar expansion jacking device and construction method |
| WO2016112749A1 (en) * | 2015-01-14 | 2016-07-21 | 中国矿业大学 | Non-coal-pillar gob-side entry retaining method having filling-wall self-elimination |
| CN109519191A (en) * | 2018-10-19 | 2019-03-26 | 太原理工大学 | A method of prevent fully-mechanized mining working from withdrawing stage adjusting lane excessive deformation |
| CN110240458A (en) * | 2019-07-04 | 2019-09-17 | 安徽固维特材料科技有限公司 | A kind of tailing solidifying agent for low temperature environment and preparation method thereof, application method |
| CN112505040A (en) * | 2020-11-17 | 2021-03-16 | 山东科技大学 | Carbon dioxide sealing determination system and determination method based on filling paste |
| CN113969802A (en) * | 2021-03-27 | 2022-01-25 | 西安科技大学 | Filling height analysis method for filling body in combined filling mining |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0213223A1 (en) * | 1985-08-27 | 1987-03-11 | Katowickie Gwarectwo Weglowe Kopalnia Wegla Kamiennego Wieczorek | A method of mining the deposits with maintenance of permanent control of deformation of the surface, especially within the range of the influence of mining |
| CN101343167A (en) * | 2007-07-10 | 2009-01-14 | 中国矿业大学(北京) | Backfilled enclosed material and its use method |
| CN101792291A (en) * | 2010-01-25 | 2010-08-04 | 淄博市王庄煤矿 | High-water expansion filling material |
| CN102815963A (en) * | 2012-09-14 | 2012-12-12 | 淄博矿业集团有限责任公司 | High-water-content micro-expansion filling material composition |
| CN102995513A (en) * | 2012-11-21 | 2013-03-27 | 北京航空航天大学 | Foundation treatment method for accurately regulating and controlling differential settlement of old and new road beds by using expanding materials |
-
2013
- 2013-08-28 CN CN2013103809668A patent/CN103452586A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0213223A1 (en) * | 1985-08-27 | 1987-03-11 | Katowickie Gwarectwo Weglowe Kopalnia Wegla Kamiennego Wieczorek | A method of mining the deposits with maintenance of permanent control of deformation of the surface, especially within the range of the influence of mining |
| CN101343167A (en) * | 2007-07-10 | 2009-01-14 | 中国矿业大学(北京) | Backfilled enclosed material and its use method |
| CN101792291A (en) * | 2010-01-25 | 2010-08-04 | 淄博市王庄煤矿 | High-water expansion filling material |
| CN102815963A (en) * | 2012-09-14 | 2012-12-12 | 淄博矿业集团有限责任公司 | High-water-content micro-expansion filling material composition |
| CN102995513A (en) * | 2012-11-21 | 2013-03-27 | 北京航空航天大学 | Foundation treatment method for accurately regulating and controlling differential settlement of old and new road beds by using expanding materials |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016112749A1 (en) * | 2015-01-14 | 2016-07-21 | 中国矿业大学 | Non-coal-pillar gob-side entry retaining method having filling-wall self-elimination |
| AU2015377002B2 (en) * | 2015-01-14 | 2016-09-29 | China University Of Mining And Technology | Non-coal-pillar gob-side entry retaining method having filling-wall self-elimination |
| CN105240017A (en) * | 2015-11-23 | 2016-01-13 | 武汉理工大学 | Block-shaped cutting, jacking and pushing ore removal mining method of double-layer extreme-thin jade mine |
| CN105240017B (en) * | 2015-11-23 | 2019-03-08 | 武汉理工大学 | A kind of very thin jade nugget shape cutting pushing tow ore removal mining methods of bilayer |
| CN105422146A (en) * | 2015-12-15 | 2016-03-23 | 东北大学 | Underground stope artificial pillar expansion jacking device and construction method |
| CN109519191A (en) * | 2018-10-19 | 2019-03-26 | 太原理工大学 | A method of prevent fully-mechanized mining working from withdrawing stage adjusting lane excessive deformation |
| CN110240458A (en) * | 2019-07-04 | 2019-09-17 | 安徽固维特材料科技有限公司 | A kind of tailing solidifying agent for low temperature environment and preparation method thereof, application method |
| CN110240458B (en) * | 2019-07-04 | 2021-07-16 | 安徽固维特材料科技有限公司 | Tailing curing agent for low-temperature environment and preparation method and use method thereof |
| CN112505040A (en) * | 2020-11-17 | 2021-03-16 | 山东科技大学 | Carbon dioxide sealing determination system and determination method based on filling paste |
| CN113969802A (en) * | 2021-03-27 | 2022-01-25 | 西安科技大学 | Filling height analysis method for filling body in combined filling mining |
| CN113969802B (en) * | 2021-03-27 | 2023-09-08 | 西安科技大学 | Filling height analysis method of filling body in combined filling mining |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103452586A (en) | Gob expanding material prestressed filling method and prestressed filling material | |
| CN103449837B (en) | Mining foam paste filling material prepared by utilizing synergistic foaming method and preparation method thereof | |
| CN101792291B (en) | High-water expansion filling material | |
| CN101693615A (en) | Sulphoaluminate cement base synchronous slip casting material and preparation method | |
| CN105218023A (en) | A kind of drift-sand foam material and preparation method | |
| CN102101788B (en) | Red mud-based fluid swelling filling material | |
| EP0988260A1 (en) | High pulp density, fast setting and high early strength backfill method and material | |
| CN103011742B (en) | Actively-pressing high-swelling pasty filling material | |
| CN102101790B (en) | Tailing-based fluid swelling filling material | |
| CN110781587B (en) | Multi-objective optimization method for anti-segregation waste rock filling slurry by using low-quality solid waste | |
| CN102211916B (en) | Paste filling material composition prepared from drift-sand and industrial solid waste | |
| CN103319123B (en) | Fly ash-based cemented filling material and preparation method thereof | |
| CN103664121B (en) | Hole-sealing grouting material and preparation method thereof and application | |
| CN109626935A (en) | A kind of weak cementing softrock-like material preparation method of low-intensity dilatancy | |
| CN105731948B (en) | A kind of microfine mine tailing consolidated fill cementing agent | |
| CN109734379A (en) | A kind of preparation method of Tailing Paste Filling material | |
| CN105541255B (en) | Copper ashes base Low-silica iron ore tailings filler and its preparation technology | |
| CN106365564A (en) | Mining inorganic ultrafine composite grouting and water plugging material and preparation method thereof | |
| CN105776911A (en) | Gel material for ultra-fine tailing filling and dry heaping | |
| CN108863215B (en) | Goaf paste filling slurry and preparation method thereof | |
| CN104150820A (en) | Synchronous grouting slurry for shield driving construction of water-enriched sandy gravel stratum | |
| CN103396066B (en) | A kind of fast gravity die compaction material and its preparation method and application | |
| CN102775105A (en) | Mine paste filling aggregate prepared from building waste materials and preparation method of mine paste filling aggregate | |
| CN103130485A (en) | Non-dehydration micro-expansive whole-tailing filling consolidation agent and preparation method thereof | |
| CN107311582A (en) | A kind of early strong rubber gel material proportioning decision-making technique of low cost |
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: 20131218 |