CN104845411B - Extra fine heavy calcium carbonate powder body production method - Google Patents
Extra fine heavy calcium carbonate powder body production method Download PDFInfo
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Abstract
The invention belongs to nonmetallic mineral manufacture field, and in particular to a kind of extra fine heavy calcium carbonate powder body production method.The present invention is comprised the following steps：Marble raw material is broken for the calcium carbonate coarse fodder of diameter≤1cm；Calcium carbonate coarse fodder is ground by dry mill, calcium carbonate powder compound is obtained；Calcium carbonate powder compound is carried out into classification treatment, it is second level powder, the third level powder of granularity ＜ k of j~k to obtain the first order powder of granularity ＞ j, granularity, wherein k ＜ j, and be ground first order powder return dry mill, second level powder is carried out into wet grinding, third level powder is sent directly into the homogenizing treatment of product homogenizing storehouse or is also carried out wet grinding；After the calcium carbonate slurry drying and crushing after whole wet grindings, homogenizing is processed and packed.The present invention, can effectively save energy consumption on the premise of product quality, production efficiency is ensured.
Description
Technical field
The invention belongs to nonmetallic mineral manufacture field, and in particular to a kind of extra fine heavy calcium carbonate powder body production method.
Background technology
The production method of powdered whiting mainly has two methods of dry and wet, dry production efficiency high, but product
Fineness is limited by grinding and classification technique, it is difficult to produce the coarse whiting product of ultra-fine fineness.Wet production powder product fineness
It is relatively low, treatment can also be modified to powder in grinding, therefore wet method is commonly used to produce ultrafine heavy calcium product, but wet method is given birth to
It is related to the operations such as configuration, grinding, the drying of slurry in product, therefore production efficiency is relatively low, energy consumption is also higher.Patent
CN101875793A proposes a kind of dry method milling and wet grinding combines the production method of production superfine modified heavy calcium carbonate,
The meal of dry grinding is directly made into slurry, wet grinding production superfine powder is then carried out again, its product has output capacity
The features such as height, purity high, even particle size distribution, but analyzed through inventor, and in the method, the part in dry grinding meal is thin
Powder can repeat to grind, and cause whole low production efficiency, high energy consumption, while the fine powder in slurry is also easy to generation in wet grinding
Aggregation, influences grinding efficiency and product quality.
The content of the invention
The technical problems to be solved by the invention are：There is provided that a kind of good product quality, production efficiency is high, that energy consumption is low is ultra-fine
Heavy calcium carbonate powder production method.
It is to solve above-mentioned technical problem the technical solution adopted in the present invention：Extra fine heavy calcium carbonate powder body producer
Method, comprises the following steps：
A, the calcium carbonate coarse fodder that marble raw material is broken for diameter≤1cm；
B, the calcium carbonate coarse fodder of diameter≤1cm is ground by dry mill, obtains calcium carbonate powder compound；
C, calcium carbonate powder compound is carried out into classification treatment, it is j~k's to obtain the first order powder of granularity ＞ j, granularity
The third level powder of second level powder, granularity ＜ k, wherein k ＜ j, and first order powder return dry mill is ground,
Second level powder is collected after entering the first wet-milled slurry storehouse, wet grinding, third level powder are carried out using the first wet type flour mill
Body is processed after collection using one of following two ways, when the granularity of third level powder meets product granularity requirement, directly
The feeding homogenizing treatment of product homogenizing storehouse, when the granularity of third level powder is required more than product granularity, collection enters second
Wet-milled slurry storehouse, wet grinding is carried out using the second wet type flour mill；
D, by the calcium carbonate slurry drying and crushing after whole wet grindings after, into the homogenizing treatment of homogenizing storehouse, then
Packaging.
It is further：Step C use method for, calcium carbonate powder compound is carried out into classification treatment, obtain granularity ＞
The first order powder of 300 mesh, granularity are the second level powder of 300 mesh~1000 mesh, the third level powder of the mesh of granularity ＜ 1000, and
First order powder return dry mill is ground, second level powder is collected after entering the first wet-milled slurry storehouse, used
First wet type flour mill carries out wet grinding, is ground to 1000 mesh~1500 mesh, after third level powder is through collection, is sent directly into product
The homogenizing treatment of product homogenizing storehouse.
It is further：Step C use method for, calcium carbonate powder compound is carried out into classification treatment, obtain granularity ＞
The first order powder of 600 mesh, granularity are the second level powder of 600 mesh~2500 mesh, the third level powder of the mesh of granularity ＜ 2500, and
First order powder return dry mill is ground, second level powder is collected after entering the first wet-milled slurry storehouse, used
First wet type flour mill carries out wet grinding, is ground to 2500 mesh~3000 mesh, after third level powder is through collection, is sent directly into product
The homogenizing treatment of product homogenizing storehouse.
It is further：Step C use method for, calcium carbonate powder compound is carried out into classification treatment, obtain granularity ＞
The first order powder of 300 mesh, granularity are the second level powder of 300 mesh~1000 mesh, the third level powder of the mesh of granularity ＜ 1000, and
First order powder return dry mill is ground, second level powder is collected after entering the first wet-milled slurry storehouse, used
First wet type flour mill carries out wet grinding, is ground to 2500 mesh~3000 mesh, and third level powder enters the second wet-milling through collecting
Slurry storehouse, wet grinding is carried out using the second wet type flour mill, is ground to 2500 mesh~3000 mesh.
It is further：In step C, wet grinding method is that water is added in calcium carbonate powder, is configured to solid constituent
Content is 70%~80% slurry, is sent in wet type flour mill by mashing pump, while being starched toward addition in wet type flour mill
Expect the dispersant of weight 1%~3%, grinding is then completed in abrasive media.
It is further：Dispersant is Sodium Polyacrylate.
It is further：Abrasive media is zirconium aluminium composite bead.
It is further：Wet type flour mill is at least 2, and milling tandem.
It is further：During wet grinding, while dispersant is added, slurry weight is added toward wet type flour mill
The activator of amount 2%~5%, activator is stearic acid late or titanate coupling agent.
It is further：In step D, the drying temperature of calcium carbonate slurry is 250 DEG C~280 DEG C.
The beneficial effects of the invention are as follows：Meal to dry grinding carries out classification treatment, removal large scale and small size grain
The powder in footpath, the second level powder for taking median diameter carries out wet grinding, can improve wet grinding efficiency, reduces production unit energy
Consumption, while product cut size narrow distribution, product fineness is evenly；In addition, the third level powder of small size particle diameter also pre-separation goes out
Come, it is to avoid third level powder reassembles in wet grinding, improves grinding efficiency and product quality, while third level powder
Can also be used directly as final superfine powder product or be processed further other specification products, improve the product rate of output.
Specific embodiment
Extra fine heavy calcium carbonate powder body production method, comprises the following steps：
A, by marble raw material by hammer crushing crusher machine, sieve takes the marble of diameter≤20 centimetre, is fed by vibration
Material machine is put into jaw crusher, and the calcium carbonate coarse fodder of diameter≤1 centimetre is obtained through crushing；
B, by the calcium carbonate coarse fodder of diameter≤1cm by bobbing machine send into dry mill be ground, obtain calcium carbonate
Powder compound；Dry mill can select raymond mill；
C, calcium carbonate powder compound is carried out by classification treatment by multi-stage classifier, obtain the first order powder of granularity ＞ j
Body, granularity are second level powder, the wherein third level powder of granularity ＜ k, k ＜ j of j~k, and first order powder is returned into dry type
Flour mill is ground, and second level powder is collected after entering the first wet-milled slurry storehouse, is carried out using the first wet type flour mill wet
Method is ground, and third level powder is processed after collection using one of following two ways, when the granularity of third level powder meets product
During granularity requirements, the homogenizing treatment of product homogenizing storehouse is sent directly into, when the granularity of third level powder is more than product granularity requirement
When, collect and enter the second wet-milled slurry storehouse, wet grinding is carried out using the second wet type flour mill；The processing mode of third level powder
Value according to k determines；
D, by the calcium carbonate slurry drying and crushing after whole wet grindings after, into the homogenizing treatment of homogenizing storehouse, then
Packaging.If third level powder has been also carried out wet grinding, including the first wet type flour mill grinds second level powder wet method
The calcium carbonate slurry that the calcium carbonate slurry that is obtained after mill, the second wet type flour mill will be obtained after third level powder wet grinding；If
Third level powder sends into product homogenizing storehouse, then only include the carbon that the first wet type flour mill will be obtained after the powder wet grinding of the second level
Sour calcium slurry.
Specifically, in step C, the value of j and k determines according to the product granularity of extra fine heavy calcium carbonate powder body, ultra-fine heavy
The product granularity of matter calcium carbonate powder is often 1000 mesh~1500 mesh, two kinds of 2500 mesh~3000 mesh, and the value of k generally takes product
When the maximum of granularity, i.e. product granularity are 1000 mesh~1500 mesh, k is that 1000 mesh, i.e. product granularity are 2500 mesh~3000
During mesh, k is 2500 mesh, and j can be according to value be determined again after experiment, and in the present embodiment, product granularity is 1000 mesh~1500 mesh
When, k is 1000 mesh, and j is 300 mesh, and when product granularity is 2500 mesh~3000 mesh, k is 2500 mesh, and j is 600 mesh.
When product granularity is 1000 mesh~1500 mesh, step C uses method for calcium carbonate powder compound is classified
Treatment, it is the second level powder of 300 mesh~1000 mesh, the mesh of granularity ＜ 1000 to obtain the first order powder of the mesh of granularity ＞ 300, granularity
Third level powder, and first order powder return dry mill is ground, second level powder is collected and enters first wet
After defibrination feed bin, wet grinding is carried out using the first wet type flour mill, be ground to 1000 mesh~1500 mesh, third level powder is through receiving
After collection, the homogenizing treatment of product homogenizing storehouse is sent directly into.
When product granularity is 2500 mesh~3000 mesh, step C uses method for calcium carbonate powder compound is classified
Treatment, it is the second level powder of 600 mesh~2500 mesh, the mesh of granularity ＜ 2500 to obtain the first order powder of the mesh of granularity ＞ 600, granularity
Third level powder, and first order powder return dry mill is ground, second level powder is collected and enters first wet
After defibrination feed bin, wet grinding is carried out using the first wet type flour mill, be ground to 2500 mesh~3000 mesh, third level powder is through receiving
After collection, the homogenizing treatment of product homogenizing storehouse is sent directly into.
Preferably, when product granularity is 2500 mesh~3000 mesh, step C uses method for calcium carbonate powder is mixed
Material carries out classification treatment, obtains second level powder, grain that the first order powder of the mesh of granularity ＞ 300, granularity are 300 mesh~1000 mesh
The third level powder of the mesh of ＜ 1000 is spent, and first order powder return dry mill is ground, second level powder is collected
Into after the first wet-milled slurry storehouse, wet grinding is carried out using the first wet type flour mill, be ground to 2500 mesh~3000 mesh, the 3rd
Level powder through collect enter the second wet-milled slurry storehouse, wet grinding is carried out using the second wet type flour mill, be ground to 2500 mesh~
3000 mesh.Using which, second level powder and third level powder are separated into wet grinding, due to the powder for wet grinding
Particle diameter distribution is narrower, thus, evenly, production efficiency is higher for product granularity.
Preferably, in step C, wet grinding method is that water is added in calcium carbonate powder, is configured to solid component content
It is 70%~80% slurry, is sent in wet type flour mill by mashing pump, while toward adds slurry weight in wet type flour mill
The dispersant of amount 1%~3%, then completes grinding in abrasive media；Wherein, dispersant is preferably Sodium Polyacrylate, grinding
Medium is preferably zirconium aluminium composite bead.
Preferably, wet type flour mill is at least 2, and milling tandem.In step C, during wet grinding, 1 wet type
Product granularity after flour mill grinding is 2500 mesh~3000 mesh, and uses 2 milling tandems, then product granularity is up to 4000 mesh
~5000 mesh.By the way of milling tandem, the product of thinner specification can be produced.
Preferably, during wet grinding, while dispersant is added, slurry weight is added toward wet type flour mill
2%~5% activator, activator is stearic acid late or titanate coupling agent, can be enhanced product performance.
Preferably, in step D, the drying temperature of calcium carbonate slurry is 250 DEG C~280 DEG C.
Embodiment 1
1. by marble raw material by hammer crushing crusher machine, sieve takes the marble of diameter≤20 centimetre, is fed by vibration
Material machine is put into jaw crusher, and the calcium carbonate coarse fodder of diameter≤1 centimetre is obtained through crushing；
2. the calcium carbonate coarse fodder of diameter≤1cm is sent into raymond mill by bobbing machine to be ground, obtains calcium carbonate
Powder compound；
3. calcium carbonate powder compound is carried out by classification treatment by multi-stage classifier, obtains the purposes first of granularity ＞ 300
Level powder, granularity are the second level powder of 300 mesh~1000 mesh, the third level powder of the mesh of granularity ＜ 1000, and by first order powder
Body returns to dry mill and is ground, and second level powder is collected after entering the first wet-milled slurry storehouse, is ground using the first wet type
Powder machine carries out wet grinding, is ground to 1000 mesh~1500 mesh, after third level powder is through collection, is sent directly into product homogenizing storehouse and enters
The treatment of row homogenizing；The wet grinding method of second level powder is：Water is added in calcium carbonate powder, solid component content is configured to
It is 75% slurry, is sent in wet type flour mill by mashing pump, while toward adds slurry weight 1.5% in wet type flour mill
Sodium Polyacrylate, then in zirconium aluminium composite bead complete grinding.
4. after the calcium carbonate slurry drying and crushing for second level powder being obtained after wet grinding, carried out into homogenizing storehouse
Change is processed, and is then packed.The drying temperature of calcium carbonate slurry is 250 DEG C~280 DEG C.
The present embodiment, can saving energy consumption 15% on the premise of product quality, production efficiency is ensured.
Embodiment 2
1. by marble raw material by hammer crushing crusher machine, sieve takes the marble of diameter≤20 centimetre, is fed by vibration
Material machine is put into jaw crusher, and the calcium carbonate coarse fodder of diameter≤1 centimetre is obtained through crushing；
2. the calcium carbonate coarse fodder of diameter≤1cm is sent into raymond mill by bobbing machine to be ground, obtains calcium carbonate
Powder compound；
3. calcium carbonate powder compound is carried out by classification treatment by multi-stage classifier, obtains the purposes first of granularity ＞ 600
Level powder, granularity are the second level powder of 600 mesh~2500 mesh, the third level powder of the mesh of granularity ＜ 2500, and by first order powder
Body returns to dry mill and is ground, and second level powder is collected after entering the first wet-milled slurry storehouse, is ground using the first wet type
Powder machine carries out wet grinding, is ground to 2500 mesh~3000 mesh, after third level powder is through collection, is sent directly into product homogenizing storehouse and enters
The treatment of row homogenizing；The wet grinding method of second level powder is：Water is added in calcium carbonate powder, solid component content is configured to
It is 70% slurry, is sent in wet type flour mill by mashing pump, while toward adds slurry weight 1% in wet type flour mill
Sodium Polyacrylate, adds the stearic acid late of slurry weight 5%, and grinding is then completed in zirconium aluminium composite bead.
4. after the calcium carbonate slurry drying and crushing for second level powder being obtained after wet grinding, carried out into homogenizing storehouse
Change is processed, and is then packed.The drying temperature of calcium carbonate slurry is 250 DEG C~280 DEG C.
The present embodiment, can saving energy consumption 13% on the premise of product quality, production efficiency is ensured.
Embodiment 3
1. by marble raw material by hammer crushing crusher machine, sieve takes the marble of diameter≤20 centimetre, is fed by vibration
Material machine is put into jaw crusher, and the calcium carbonate coarse fodder of diameter≤1 centimetre is obtained through crushing；
2. the calcium carbonate coarse fodder of diameter≤1cm is sent into raymond mill by bobbing machine to be ground, obtains calcium carbonate
Powder compound；
3. calcium carbonate powder compound is carried out by classification treatment by multi-stage classifier, obtains the purposes first of granularity ＞ 300
Level powder, granularity are the second level powder of 300 mesh~1000 mesh, the third level powder of the mesh of granularity ＜ 1000, and by first order powder
Body returns to dry mill and is ground, and second level powder is collected after entering the first wet-milled slurry storehouse, is ground using the first wet type
Powder machine carries out wet grinding, is ground to 2500 mesh~3000 mesh, and third level powder enters the second wet-milled slurry storehouse, uses through collecting
Second wet type flour mill carries out wet grinding, is ground to 2500 mesh~3000 mesh.Second level powder, the wet method of third level powder are ground
Mill method is：Water is added in calcium carbonate powder, the slurry that solid component content is 80% is configured to, is sent into by mashing pump
To in wet type flour mill, while toward the Sodium Polyacrylate of addition slurry weight 3% in wet type flour mill, adding slurry weight 3%
Titanate coupling agent, then in zirconium aluminium composite bead complete grinding.The wet grinding difference of second level powder, third level powder
Completed in independent grinding system.
4. after the calcium carbonate slurry drying and crushing for second level powder, third level powder being obtained after wet grinding, enter
The homogenizing treatment of homogenizing storehouse, then packs.The drying temperature of calcium carbonate slurry is 250 DEG C~280 DEG C.
The present embodiment, can saving energy consumption 20% on the premise of product quality, production efficiency is ensured.
Claims (10)
1. extra fine heavy calcium carbonate powder body production method, it is characterised in that comprise the following steps：
A, the calcium carbonate coarse fodder that marble raw material is broken for diameter≤1cm；
B, the calcium carbonate coarse fodder of diameter≤1cm is ground by dry mill, obtains calcium carbonate powder compound；
C, calcium carbonate powder compound is carried out into classification treatment, it is the second of j~k to obtain the first order powder of granularity ＞ j, granularity
Level powder, the wherein third level powder of granularity ＜ k, k ＜ j, and first order powder return dry mill is ground, by the
Second patent flour body is collected after entering the first wet-milled slurry storehouse, and wet grinding, third level powder warp are carried out using the first wet type flour mill
Using the treatment of one of following two ways after collection, when the granularity of third level powder meets product granularity requirement, it is sent directly into
The homogenizing treatment of product homogenizing storehouse, when the granularity of third level powder is required more than product granularity, collects and enters the second wet-milling
Slurry storehouse, wet grinding is carried out using the second wet type flour mill；
D, by the calcium carbonate slurry drying and crushing after whole wet grindings after, into the homogenizing treatment of homogenizing storehouse, then pack
.
2. extra fine heavy calcium carbonate powder body production method as claimed in claim 1, it is characterised in that：Step C use method for,
Calcium carbonate powder compound is carried out into classification treatment, it is 300 mesh~1000 to obtain the first order powder of the mesh of granularity ＞ 300, granularity
The third level powder of purpose second level powder, the mesh of granularity ＜ 1000, and first order powder return dry mill is ground,
Second level powder is collected after entering the first wet-milled slurry storehouse, wet grinding is carried out using the first wet type flour mill, be ground to
1000 mesh~1500 mesh, after third level powder is through collection, are sent directly into the homogenizing treatment of product homogenizing storehouse.
3. extra fine heavy calcium carbonate powder body production method as claimed in claim 1, it is characterised in that：Step C use method for,
Calcium carbonate powder compound is carried out into classification treatment, it is 600 mesh~2500 to obtain the first order powder of the mesh of granularity ＞ 600, granularity
The third level powder of purpose second level powder, the mesh of granularity ＜ 2500, and first order powder return dry mill is ground,
Second level powder is collected after entering the first wet-milled slurry storehouse, wet grinding is carried out using the first wet type flour mill, be ground to
2500 mesh~3000 mesh, after third level powder is through collection, are sent directly into the homogenizing treatment of product homogenizing storehouse.
4. extra fine heavy calcium carbonate powder body production method as claimed in claim 1, it is characterised in that：Step C use method for,
Calcium carbonate powder compound is carried out into classification treatment, it is 300 mesh~1000 to obtain the first order powder of the mesh of granularity ＞ 300, granularity
The third level powder of purpose second level powder, the mesh of granularity ＜ 1000, and first order powder return dry mill is ground,
Second level powder is collected after entering the first wet-milled slurry storehouse, wet grinding is carried out using the first wet type flour mill, be ground to
2500 mesh~3000 mesh, third level powder enters the second wet-milled slurry storehouse through collecting, and wet method is carried out using the second wet type flour mill
Grinding, is ground to 2500 mesh~3000 mesh.
5. extra fine heavy calcium carbonate powder body production method as claimed in claim 1, it is characterised in that：Wet method described in step C
Ginding process is that water is added in calcium carbonate powder, the slurry that solid component content is 70%~80% is configured to, by slurry
It is pumped into wet type flour mill, while toward the dispersant of addition slurry weight 1%~3% in wet type flour mill, then grinding
Grinding is completed in grinding media.
6. extra fine heavy calcium carbonate powder body production method as claimed in claim 5, it is characterised in that：The dispersant is poly- third
Olefin(e) acid sodium.
7. extra fine heavy calcium carbonate powder body production method as claimed in claim 5, it is characterised in that：The abrasive media is zirconium
Aluminium composite bead.
8. extra fine heavy calcium carbonate powder body production method as claimed in claim 5, it is characterised in that：The wet type flour mill is
At least 2, and milling tandem.
9. extra fine heavy calcium carbonate powder body production method as claimed in claim 5, it is characterised in that：During wet grinding,
While dispersant is added, the activator of slurry weight 2%~5% is added toward wet type flour mill, the activator is hard
Resin acid emulsion or titanate coupling agent.
10. extra fine heavy calcium carbonate powder body production method as claimed in claim 1, it is characterised in that：In step D, calcium carbonate
The drying temperature of slurry is 250 DEG C~280 DEG C.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105348861A (en) * | 2015-10-23 | 2016-02-24 | 谭乔 | Functional calcium carbonate powder and production method thereof |
| CN105239748A (en) * | 2015-11-13 | 2016-01-13 | 哈尔滨中大型材科技股份有限公司 | Polymer PVC decoration product and manufacturing method |
| CN106497143B (en) * | 2016-11-02 | 2018-04-06 | 四川荥经开全实业有限公司 | A kind of method that dicalcium powder is reclaimed using marble wastes |
| CN107043556A (en) * | 2017-04-17 | 2017-08-15 | 华东理工大学 | A kind of preparation method of the narrow coarse whiting of particle diameter distribution |
| CN106957538A (en) * | 2017-04-17 | 2017-07-18 | 华东理工大学 | A kind of preparation method of ultra-fine coating calcium carbonate slurry |
| CN107187902A (en) * | 2017-06-30 | 2017-09-22 | 广西贺州市科隆粉体有限公司 | A kind of powdered whiting material homogenizer method |
| CN107345871B (en) * | 2017-06-30 | 2020-06-19 | 广西贺州市科隆粉体有限公司 | Calcium carbonate raw material quality detection method |
| CN108948791A (en) * | 2018-05-10 | 2018-12-07 | 桂林永福恒达实业有限公司 | A kind of micro mist calcium carbonate dry type preparation method of high-purity |
| CN109535483A (en) * | 2018-12-21 | 2019-03-29 | 湖南磊鑫新材料科技有限公司 | The preparation method of film modeling master batch coarse whiting functional stuffing |
| CN109627467A (en) * | 2018-12-21 | 2019-04-16 | 湖南磊鑫新材料科技有限公司 | The preparation method of non-woven fabrics master batch filler |
| CN110238059B (en) * | 2019-07-06 | 2022-03-18 | 四川玉塑新材料科技有限公司 | Calcium carbonate powder multi-stage classification method |
| CN115806303A (en) * | 2021-09-13 | 2023-03-17 | 中国科学院过程工程研究所 | Method for preparing superfine ground calcium carbonate and co-producing active calcium oxide by using marble waste residues |
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| CN101775237B (en) * | 2010-01-29 | 2012-11-14 | 大连友兰企业集团有限公司 | Method for processing coupled superfinely ground and heavy calcium carbonates |
| CN101875793B (en) * | 2010-05-20 | 2013-04-10 | 建德市兴隆钙粉有限公司 | Production method for superfine modified heavy calcium carbonate by wet grinding |
| CN103881417A (en) * | 2012-12-24 | 2014-06-25 | 许峰 | Superhigh-fineness calcium carbonate composite powder |
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Address after: 625400, Shimian County, Shimian County, Sichuan, Ya'an Province, eight brand village, three sets, Sichuan, Gongga, snow new materials, Limited by Share Ltd Applicant after: Gongga Sichuan snow new materials Limited by Share Ltd Address before: Ya'an City, Sichuan province 625400 Shimian County town of Guangyuan Fort Sichuan Jufeng nucotn asbestos powder Co Ltd Applicant before: Sichuan Asbestos Jufeng Fowder Co., Ltd. |
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Address after: 625400 Sichuan gonggaxue New Material Co., Ltd., group 3, Babai village, Yingzheng Township, Shimian County, Ya'an City, Sichuan Province Patentee after: Sichuan Gongga snow New Material Co., Ltd Address before: 625400, Shimian County, Shimian County, Sichuan, Ya'an Province, eight brand village, three sets, Sichuan, Gongga, snow new materials, Limited by Share Ltd Patentee before: Gongga Sichuan snow new materials Limited by Share Ltd |