CN102584278A - Forsterite seating brick and production method of forsterite seating brick - Google Patents
Forsterite seating brick and production method of forsterite seating brick Download PDFInfo
- Publication number
- CN102584278A CN102584278A CN2012100086060A CN201210008606A CN102584278A CN 102584278 A CN102584278 A CN 102584278A CN 2012100086060 A CN2012100086060 A CN 2012100086060A CN 201210008606 A CN201210008606 A CN 201210008606A CN 102584278 A CN102584278 A CN 102584278A
- Authority
- CN
- China
- Prior art keywords
- forsterite
- brick
- raw material
- seating brick
- fine powder
- 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.)
- Granted
Links
- 229910052839 forsterite Inorganic materials 0.000 title claims abstract description 60
- HCWCAKKEBCNQJP-UHFFFAOYSA-N magnesium orthosilicate Chemical compound [Mg+2].[Mg+2].[O-][Si]([O-])([O-])[O-] HCWCAKKEBCNQJP-UHFFFAOYSA-N 0.000 title claims abstract description 60
- 239000011449 brick Substances 0.000 title claims abstract description 55
- 238000004519 manufacturing process Methods 0.000 title abstract description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000002994 raw material Substances 0.000 claims abstract description 30
- 239000000843 powder Substances 0.000 claims abstract description 26
- 235000019353 potassium silicate Nutrition 0.000 claims abstract description 16
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000002156 mixing Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims abstract description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 52
- 239000000395 magnesium oxide Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 19
- 239000000377 silicon dioxide Substances 0.000 claims description 16
- 238000007670 refining Methods 0.000 claims description 15
- 239000004576 sand Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 10
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 9
- 229910052742 iron Inorganic materials 0.000 claims description 7
- 241001504664 Crossocheilus latius Species 0.000 claims description 5
- 230000032683 aging Effects 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- 238000003825 pressing Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 4
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 3
- 230000006835 compression Effects 0.000 abstract 2
- 238000007906 compression Methods 0.000 abstract 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 abstract 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 abstract 2
- 235000014380 magnesium carbonate Nutrition 0.000 abstract 2
- 239000001095 magnesium carbonate Substances 0.000 abstract 2
- 239000006004 Quartz sand Substances 0.000 abstract 1
- 238000000748 compression moulding Methods 0.000 abstract 1
- 238000009749 continuous casting Methods 0.000 description 8
- 229910000831 Steel Inorganic materials 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 229910001570 bauxite Inorganic materials 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 238000011900 installation process Methods 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000003643 water by type Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910001051 Magnalium Inorganic materials 0.000 description 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N Na2O Inorganic materials [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Landscapes
- Compositions Of Oxide Ceramics (AREA)
Abstract
The invention discloses a forsterite seating brick and a production method of the forsterite seating brick. The forsterite seating brick comprises the following components in percentage by weight: 50-70% of forsterite raw material, 17-27% of forsterite clinker, 4-14% of 90# magnesite fine powder, 0-3% of refined quartz sand fine powder and 6-9% of water glass. The production method of the forsterite seating brick comprises the steps of uniformly mixing the components, compression molding, baking for 24 h at the temperature of 180 DEG C, naturally cooling and drawing to obtain the forsterite seating brick. According to the forsterite seating brick, a cheap forsterite is adopted as a main material and the traditional tundish seating brick produced by using rare and precious alumina and magnesite as main materials is replaced, so that the production cost of the tundish seating brick is greatly reduced and the product quality is improved; and the normal-temperature compression strength, the high-temperature change rate and the compression strength index of the forsterite seating brick all reach or exceed the quality indexes of the traditional tundish seating brick through a detection.
Description
Technical field
the present invention relates to a kind of fire-resistant brick cup at the mouth of a river under the continuous casting tundish internal fixing.
Background technology
Mostly
original continuous casting tundish brick cup is high alumina matter or magnalium matter; Its production technique is divided into 2 kinds substantially: a kind of is to be main raw material with each grade bauxite clinker and magnesia; Add a small amount of graphite; Adopt combinations such as water glass,, make finished product through baking again through high-pressure molding behind the batch mixing; Another kind is to be main raw material with each grade bauxite clinker and magnesia, and cement, micro mist etc. is wedding agent, and the pug that mixes is added mould internal vibration moulding, and the demoulding after the normal temperature health makes finished product through baking again.
along with the development rapidly of aluminum smelting industry and refractories industry in recent years, the sharp increase of bauxite clinker and magnesia market demand, and cost of material presents the trend that rises steadily; Also when the river rises the boat goes up for the production cost of tundish brick cup, thereby, there are many tundish brick cup products to use inferior materials and turn out substandard goods at present for reducing cost; Cause tundish brick cup downgrade; Hot strength is low, and volume stability is poor, causes the blast furnace number to connect and is prone to infiltrate molten steel when watering around the brick cup; What the tundish brick cup was too early is etched, so that leads to the steel accident of wearing at brick cup position.
Summary of the invention
One of
the object of the invention, provide a kind of raw material sources fully, price is cheaper and continuous casting tundish brick cup quality that process reaches or be superior to the forsterite brick cup of currently available products.Two of the object of the invention provides a kind of method for preparing said forsterite brick cup.
Technical solution of the present invention is:
A kind of forsterite brick cup is characterized in that its composition and proportion of composing by weight percentage are: forsterite raw material 50～70%, forsterite grog 17～27%, 90
﹟
Magnesia powder 4～14%, refining silica sand fine powder 0～3%, water glass 6～9%.
The component optimum ratio of said forsterite brick cup is: forsterite raw material 60%, forsterite grog 20%, 90
﹟
Magnesia powder 10%, refining silica sand fine powder 2%, water glass 8%.
As preferably, the quality index of said forsterite raw material raw material is: volume density>=2.70 g/cm
3
, MgO>=45%, SiO
2
≤45%, Fe
2
O
3
≤10%, igloss≤3%.
As preferably, the quality index of said forsterite grog raw material is: volume density>=2.70 g/cm
3
, MgO>=50%, SiO
2
≤40%, Fe
2
O
3
≤8%, igloss≤1%.
As preferably, said 90
﹟
The quality index of magnesia powder raw material is: volume density>=3.15g/cm
3
, MgO>=90%, SiO
2
≤4%, CaO≤2%, igloss≤0.5%.
As preferably, the quality index of said refining silica sand fine powder raw material is: SiO
2
>=98%, Fe
2
O
3
≤0.2%, igloss≤0.5%.
as preferred, the quality index of said water glass raw material is: SiO2%>=26%, Na2O%>=8.5%, modulus 3.1～3.4.
A kind of working method of aforesaid forsterite brick cup comprises following process step:
In the component ratio; Earlier particle level forsterite raw material 5～3mm, 3～1mm, 1～0mm are added in the high speed muller of belt wheel stone roller; Stirred 2 minutes, and slowly added water glass then and stir 8 minutes, add through 8 minutes forsterite grog, 90 of pre-mixing again to evenly
﹟
Magnesia and refining silica sand fine powder stir and obtain the work in-process pug after 10 minutes; The pug ageing mixture was pinched agglomerating in 2～24 hours to hand, touch promptly open after, be formed into the size of requirement through friction press, at 180 ℃ of bakings 24 hours down, kiln discharge behind the naturally cooling.
Said 90
﹟
The fineness of magnesia and refining silica sand powder is 200 orders.
said pug is 1000 tons through the pressure of high brick pressing machine moulding.
the invention has the beneficial effects as follows: be that continuous casting tundish brick cup that main raw material is made greatly reduces with the alumina with the forsterite be the production cost of traditional continuous casting tundish brick cup of making of main raw material; Product is through detecting, and its cold crushing strength, higher temperature line velocity of variation and compressive strength index all meet or exceed the quality index of existing tundish brick cup.
Embodiment
Embodiment 1, a kind of forsterite brick cup, and its concrete composition and proportion of composing by weight percentage are: forsterite raw material 70%, forsterite grog 17%, 90
﹟
Magnesia powder 4%, refining silica sand fine powder 3%, water glass 6%.
Preparing method: in the component ratio; Earlier in the high speed muller with particle level forsterite raw material 5～3mm 30%, 3～1mm 40%, 30% adding belt wheel stone roller below the 1mm; Stirred 2 minutes; Slowly add water glass then and stir 8 minutes, add through 8 minutes forsterite grog, 90 of pre-mixing again to evenly
﹟
Magnesia and refining silica sand fine powder stir and obtain the work in-process pug after 10 minutes; The pug ageing mixture was pinched agglomerating in 2～24 hours to hand, touch promptly open after, be formed into the size of requirement through 1000 tons of friction presses, at 180 ℃ of bakings 24 hours down, kiln discharge behind the naturally cooling.
Product is through physical detection: cold crushing strength 47.8MPa, volume density 2.70g/cm
3
1400 ℃ * 3h burns back intensity line velocity of variation-0.40%, and compressive strength is 40.3MPa.
Compare original brick cup production cost of
said product production cost descends 50%.Prepare 50 and send Baosteel continuous casting tundish actual use, on average connect and water several 9 stoves of stove, every stove even waters about 50 minutes of time.Through on probation: the product normal temperature strength is good, does not have in the carrying and installation process and damages, and high the company when watering stove and counting uses synchronously with coating, and no brick cup is worn the generation of steel phenomenon; See that from the brick cup that turns over behind the bag volume stability is good, strength retention is high, no obvious erosion vestige.
Embodiment 2, a kind of forsterite brick cup, and its concrete composition and proportion of composing by weight percentage are: forsterite raw material 60 %, forsterite grog 20%, 90
﹟
Magnesia powder 10%, refining silica sand fine powder 2%, water glass 8%.
Preparing method: in the component ratio; Earlier in the high speed muller with forsterite raw material 5～3mm 35%, 3～1mm 40%, 25% adding belt wheel stone roller below the 1mm; Stirred 2 minutes; Slowly add water glass then and stir 8 minutes, add through 8 minutes forsterite grog, 90 of pre-mixing again to evenly
﹟
Magnesia and refining silica sand fine powder stir and obtain the work in-process pug after 10 minutes; The pug ageing mixture was pinched agglomerating in 2～24 hours to hand, touch promptly open after, be formed into the size of requirement through 1000 tons of friction presses, at 180 ℃ of bakings 24 hours down, kiln discharge behind the naturally cooling.
Product is through physical detection: cold crushing strength 55.8MPa, volume density 2.72g/cm
3
1400 ℃ * 3h burns back intensity line velocity of variation-0.12%, and compressive strength is 43.9MPa.
Compare original brick cup production cost of
said product production cost descends 50%.Prepare 100 and send Hangzhou Steel Company continuous casting tundish actual use, on average connect and water several 8 stoves of stove, every stove even waters about 45 minutes of time.Through on probation: the product normal temperature strength is good, does not have in the carrying and installation process and damages, and high the company when watering stove and counting uses synchronously with coating, and no brick cup is worn the generation of steel phenomenon; See that from the brick cup that turns over behind the bag volume stability is good, strength retention is high, no obvious erosion vestige.
Embodiment 3, a kind of forsterite brick cup, and its concrete composition and proportion of composing by weight percentage are: forsterite raw material 50 %, forsterite grog 27%, 90
﹟
Magnesia powder 14%, water glass 9%.
Preparing method: in the component ratio; Earlier in the high speed muller with forsterite raw material 5～3mm 40%, 3～1mm 40%, 20% adding belt wheel stone roller below the 1mm; Stirred 2 minutes; Slowly add water glass then and stir 8 minutes, add through 8 minutes forsterite grog, 90 of pre-mixing again to evenly
﹟
Magnesia and refining silica sand fine powder stir and obtain the work in-process pug after 10 minutes; The pug ageing mixture was pinched agglomerating in 2～24 hours to hand, touch promptly open after, be formed into the size of requirement through 1000 tons of friction presses, at 180 ℃ of bakings 24 hours down, kiln discharge behind the naturally cooling.
Product is through physical detection: cold crushing strength 51.1MPa, volume density 2.70g/cm
3
1400 ℃ * 3h burns back intensity line velocity of variation-0.22%, and compressive strength is 41.4MPa.
Compare original brick cup production cost of
said product production cost descends 40%.Prepare 50 and send Handan Iron and Steel Co continuous casting tundish actual use, on average connect and water several 10 stoves of stove, every stove even waters about 45 minutes of time.Through on probation: the product normal temperature strength is good, does not have in the carrying and installation process and damages, and high the company when watering stove and counting uses synchronously with coating, and no brick cup is worn the generation of steel phenomenon; See that from the brick cup that turns over behind the bag volume stability is good, strength retention is high, no obvious erosion vestige
Claims (10)
1. a forsterite brick cup is characterized in that its composition and proportion of composing by weight percentage are: forsterite raw material 50～70%, forsterite grog 17～27%, 90
﹟Magnesia powder 4～14%, refining silica sand fine powder 0～3%, water glass 6～9%.
2. by the described forsterite brick cup of claim 1, it is characterized in that the component optimum ratio of said forsterite brick cup is: forsterite raw material 60%, forsterite grog 20%, 90
﹟Magnesia powder 10%, refining silica sand fine powder 2%, water glass 8%.
3. by claim 1 or 2 described forsterite brick cups, it is characterized in that the quality index of said forsterite raw material raw material is: volume density>=2.70 g/cm
3, MgO>=45%, SiO
2≤45%, Fe
2O
3≤10%, igloss≤3%.
4. by claim 1 or 2 described forsterite brick cups, it is characterized in that the quality index of said forsterite grog raw material is: volume density>=2.70 g/cm
3, MgO>=50%, SiO
2≤40%, Fe
2O
3≤8%, igloss≤1%.
5. by claim 1 or 2 described forsterite brick cups, it is characterized in that said 90
﹟The quality index of magnesia powder raw material is: volume density>=3.15g/cm
3, MgO>=90%, SiO
2≤4%, CaO≤2%, igloss≤0.5%.
6. by claim 1 or 2 described forsterite brick cups, it is characterized in that the quality index of said refining silica sand fine powder raw material is: SiO
2>=98%, Fe
2O
3≤0.2%%, igloss≤0.5%.
7. by claim 1 or 2 described forsterite brick cups, it is characterized in that the quality index of said water glass raw material is: SiO
2%>=26%, Na
2O%>=8.5%, modulus 3.1～3.4.
8. the working method of a forsterite brick cup as claimed in claim 1 is characterized in that comprising following process step:
In the component ratio, just forsterite raw material 5～3mm, 3～1mm, 1～0mm add in the high speed muller of belt wheel stone roller earlier, stir 2 minutes, slowly add water glass then and stir 8 minutes to evenly, add 8 minutes forsterite grog, 90 of process pre-mixing again
﹟Magnesia and refining silica sand fine powder stir and obtain the work in-process pug after 10 minutes; The pug ageing mixture was pinched agglomerating in 2～24 hours to hand, touch promptly and open, and was formed into the size of requirement through friction press, at 180 ℃ of bakings 24 hours down, kiln discharge behind the naturally cooling.
9. by the method for the said forsterite brick cup of the described preparation of claim 8, it is characterized in that said 90
﹟The fineness of magnesia and refining silica sand fine powder is 200 orders.
10. by the method for the said unburned magnesia chrome brick of the described preparation of claim 8, it is characterized in that said pug is 1000 tons through the pressure of high brick pressing machine moulding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210008606 CN102584278B (en) | 2012-01-12 | 2012-01-12 | Forsterite seating brick and production method of forsterite seating brick |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210008606 CN102584278B (en) | 2012-01-12 | 2012-01-12 | Forsterite seating brick and production method of forsterite seating brick |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102584278A true CN102584278A (en) | 2012-07-18 |
| CN102584278B CN102584278B (en) | 2013-09-04 |
Family
ID=46473616
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210008606 Active CN102584278B (en) | 2012-01-12 | 2012-01-12 | Forsterite seating brick and production method of forsterite seating brick |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102584278B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103183515A (en) * | 2013-04-02 | 2013-07-03 | 辽宁科技大学 | Synthetic olivine brick for permanent linings of converter and magnesia shaft kiln, and preparation method thereof |
| CN108002847A (en) * | 2016-10-28 | 2018-05-08 | 河南智联寰宇知识产权运营有限公司 | Refractory brick containing forsterite and preparation method thereof |
| CN108017397A (en) * | 2016-10-28 | 2018-05-11 | 河南智联寰宇知识产权运营有限公司 | Refractory brick containing quartz sand and preparation method thereof |
| CN110950669A (en) * | 2019-11-05 | 2020-04-03 | 泰州市旺鑫耐火材料有限公司 | Formula and preparation method of forsterite brick cup |
| CN115974541A (en) * | 2023-01-30 | 2023-04-18 | 马鞍山利尔开元新材料有限公司 | Carbon-free magnesium bottom nozzle brick and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267652A (en) * | 1999-03-23 | 2000-09-27 | 四川省威远特种耐火材料实业公司 | Draining sand |
| CN1509827A (en) * | 2002-12-26 | 2004-07-07 | 首钢总公司 | Alkali inducing sand for ladle and production thereof |
| CN102114534A (en) * | 2011-03-15 | 2011-07-06 | 武汉科技大学 | Chromium-containing diversion sands for steel ladle and preparation method thereof |
-
2012
- 2012-01-12 CN CN 201210008606 patent/CN102584278B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1267652A (en) * | 1999-03-23 | 2000-09-27 | 四川省威远特种耐火材料实业公司 | Draining sand |
| CN1509827A (en) * | 2002-12-26 | 2004-07-07 | 首钢总公司 | Alkali inducing sand for ladle and production thereof |
| CN102114534A (en) * | 2011-03-15 | 2011-07-06 | 武汉科技大学 | Chromium-containing diversion sands for steel ladle and preparation method thereof |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103183515A (en) * | 2013-04-02 | 2013-07-03 | 辽宁科技大学 | Synthetic olivine brick for permanent linings of converter and magnesia shaft kiln, and preparation method thereof |
| CN108002847A (en) * | 2016-10-28 | 2018-05-08 | 河南智联寰宇知识产权运营有限公司 | Refractory brick containing forsterite and preparation method thereof |
| CN108017397A (en) * | 2016-10-28 | 2018-05-11 | 河南智联寰宇知识产权运营有限公司 | Refractory brick containing quartz sand and preparation method thereof |
| CN110950669A (en) * | 2019-11-05 | 2020-04-03 | 泰州市旺鑫耐火材料有限公司 | Formula and preparation method of forsterite brick cup |
| CN115974541A (en) * | 2023-01-30 | 2023-04-18 | 马鞍山利尔开元新材料有限公司 | Carbon-free magnesium bottom nozzle brick and preparation method thereof |
| CN115974541B (en) * | 2023-01-30 | 2023-12-22 | 马鞍山利尔开元新材料有限公司 | Carbon-free magnesium sewer nozzle brick and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102584278B (en) | 2013-09-04 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: Forsterite seating brick and production method of forsterite seating brick Effective date of registration: 20161110 Granted publication date: 20130904 Pledgee: Bank of China Limited by Share Ltd. Huzhou Development Zone Branch Pledgor: Zhejiang Mingde High-Tech Material Co.,Ltd. Registration number: 2016990000969 |
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