CN107162432B - A kind of device of liquid blast furnace production mineral wool - Google Patents
A kind of device of liquid blast furnace production mineral wool Download PDFInfo
- Publication number
- CN107162432B CN107162432B CN201710468712.XA CN201710468712A CN107162432B CN 107162432 B CN107162432 B CN 107162432B CN 201710468712 A CN201710468712 A CN 201710468712A CN 107162432 B CN107162432 B CN 107162432B
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- Prior art keywords
- furnace
- slag
- mineral wool
- blast furnace
- electrode
- Prior art date
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- 239000007788 liquid Substances 0.000 title claims abstract description 23
- 239000011490 mineral wool Substances 0.000 title claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 16
- 239000002893 slag Substances 0.000 claims abstract description 54
- 239000003818 cinder Substances 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims abstract description 24
- 229920000742 Cotton Polymers 0.000 claims abstract description 9
- 238000010891 electric arc Methods 0.000 claims abstract description 9
- 239000000835 fiber Substances 0.000 claims description 11
- 239000011819 refractory material Substances 0.000 claims description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 238000009413 insulation Methods 0.000 claims description 9
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- 229910052749 magnesium Inorganic materials 0.000 claims description 6
- 239000011777 magnesium Substances 0.000 claims description 6
- 239000010881 fly ash Substances 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 4
- 238000000465 moulding Methods 0.000 claims description 4
- 238000003723 Smelting Methods 0.000 claims description 3
- 230000003137 locomotive effect Effects 0.000 claims description 3
- 230000009471 action Effects 0.000 claims description 2
- 238000013019 agitation Methods 0.000 claims description 2
- 230000005611 electricity Effects 0.000 claims description 2
- 230000005284 excitation Effects 0.000 claims description 2
- 238000000605 extraction Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 claims description 2
- 239000002253 acid Substances 0.000 claims 1
- 239000002994 raw material Substances 0.000 abstract description 6
- 239000004615 ingredient Substances 0.000 abstract description 2
- 238000003303 reheating Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract 1
- 230000002378 acidificating effect Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000546 pharmaceutical excipient Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000010583 slow cooling Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 206010016654 Fibrosis Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004761 fibrosis Effects 0.000 description 1
- 238000000703 high-speed centrifugation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000011044 quartzite Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000007115 recruitment Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C13/00—Fibre or filament compositions
- C03C13/06—Mineral fibres, e.g. slag wool, mineral wool, rock wool
Abstract
The invention discloses a kind of devices of liquid blast furnace production mineral wool, mainly by: slag truck ladle (1), middle slag tank (2), ac arc furnace (3), four-roller centrifuge (4) and cotton collecting machine (5) form, the present invention uses raw material for blast furnace hot slag, reheating is not required to compared with cold slag produces mineral wool, energy consumption is reduced, production cost is reduced.Use furnace bottom overflow slag mode provide high temperature melt cinder ensure that it is continuous for mineral wool production line provide regime flow, temperature, ingredient, viscosity slag raw material, ensure that mineral wool production line output high standard, high-quality mineral wool product lay the foundation, the resistance to material of electric arc furnaces is washed away when reducing charging simultaneously, ensure that the resistance to material continuous use service life.
Description
Technical field
The invention belongs to utilization of waste as resource fields, are related to a kind of utilization liquid blast furnace comprehensive utilization technique, special
It is not related to a kind of device of liquid blast furnace production mineral wool.
Background technique
Mineral wool is and to add using industrial slags such as blast furnace slow cooling block slags as primary raw material with other materials by remelting, fiber
Change and manufactured inorganic fibre, can be made into the various products such as plate, pipe, felt, have insulation, heat preservation, fire prevention, anti-corrosion, humidity,
The multiple functions such as sound absorption, antidetonation are widely used in the fields such as building, industrial equipment and the vehicles, such as building exterior wall heat preserving, interior wall
Fire-proof sound insulation, Industrial Stoves and pipe insulation, ship are heat-insulated etc..
Liquid blast furnace temperature is good residual heat resources, the waste heat phase that blast furnace cinder per ton contains at 1400 DEG C or more
When the heat caused by 60Kg standard coal completely burned.For the melting sensible heat of high-temperature liquid state blast-furnace slag, State of Blast Furnace is developed
The height of slag adds utility value, directly uses liquid blast-furnace slag, and research directly prepares mineral wool by liquid blast-furnace slag
Technology substantially increases economic benefit, while effectively preventing the oxysulfide that blast furnace cinder releases during water quenching.Cause
This, directly prepares concern of the mineral wool technology by more and more researchers and enterprise using molten state blast furnace slag.
Existing mineral wool production technology mostly using slow cooling at block-like blast-furnace cinder as primary raw material, and be equipped with a certain amount of
Quartzite or other rocks adjust acidity coefficient, by the way that inorganic fibre is made after furnace cupola remelting, fibrosis.There are resources
Waste is serious and causes the drawbacks of greatly polluting to environment.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of liquid height in view of the deficiency of the prior art
Clinker produces the device of mineral wool, mainly by: slag truck ladle (1), middle slag tank (2), ac arc furnace (3), four-roller centrifuge (4) and
Cotton collecting machine (5) composition, slag truck ladle (1) pick up liquid blast furnace from tap cinder mouth by locomotive and are transported to positioned at ac arc furnace (3)
Liquid blast furnace is slowly added to ac arc furnace (3) through slag inlet (321) by the middle slag tank (2) on top, middle slag tank (2),
And flyash and acidic excipient is added by auxiliary material entrance (322), reach slag acidity coefficient between 1.2 ~ 1.6, is heated to
Four-roller centrifuge (4) are flowed into after 1480 DEG C ~ 1550 DEG C, and slag is dispersed and is drawn into fiber under the influence of centrifugal force, molding
Fiber sprinkling size blows to cotton collecting machine (5) together；The ac arc furnace (3) is mainly by furnace body (31) and bell (32) two
It is grouped as, bell (32) is located at the top of furnace body (31), is equipped with slag inlet (321) and auxiliary material entrance (322)；Furnace body (31) is cylinder
Shape structure, bottom are equipped with three-phase alternating current electrode (33), and three-phase alternating current electrode (33) is the annulus that three sector structures surround
Shape carries out insulation gap by insulating refractories (36) between three-phase, and each electrode of three-phase alternating current electrode (33) is respectively by gold
Belong to electrode (331) and fire resisting electrode (332) two parts composition, the diverging electrodes that metal electrode (331) is made into using a plurality of copper rod
It is welded on fan-shaped copper sheet and forms, the length of diverging electrodes is the 2/3 of furnace bottom thickness, and fan-shaped copper sheet part is exposed at furnace body (31)
It is external；It is made firm by ramming first with insulating refractories (36) layering to the 1/3 of furnace bottom part overall thickness after positioning metal electrode (311),
Then continue layering using conduction refractory in three-phase alternating current electrode (33) position to make firm by ramming, rest part continues to use insulated fireproof
Completion is made in material (36) layering firm by ramming；Furnace body (31) side be equipped with overflow cinder notch (38), overflow cinder notch (38) drawn from furnace bottom side and to
Four-roller centrifuge (4) are connected at top to the 1/5 of furnace body height；Inside top in excessive cinder notch (38) is equipped with temperature measuring equipment
(381).
Three-phase alternating current electrode (33) is separately connected three-phase furnace low pressure side A B C three phase mains.
The fire resisting electrode (332) is the conductive compound ramming material of magnesium carbonaceous, resistivity≤3 × 10 after carbonization-4
Ω m, bulk density >=2.8g/cm3, compressive resistance >=20Mpa；Pole piece insulate (35) and insulating refractories (36) are insulation
The calcareous compound ramming material of magnesium.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing；
Attached drawing 1 show present system structural schematic diagram
Attached drawing 2 show arc furnace bottom of the present invention top partial view diagram
Explanation is marked in figure
1, slag truck ladle, 2, middle slag tank, 3, electric arc furnaces, 4, four-roller centrifuge, 5, cotton collecting machine, 31, furnace body, 32, bell,
33, three-phase alternating current electrode, 35, pole piece insulation, 36, insulating refractories, 37, refractory brick, 38, excessive cinder notch, 39, residue mouth,
321, slag inlet, 322, auxiliary material entrance, 331, metal electrode, 332, fire resisting electrode, 381, temperature measuring equipment.
Specific embodiment
The device of the present invention a kind of liquid blast furnace production mineral wool, mainly by slag truck ladle (1), middle slag tank (2), exchange
Electric arc furnaces (3), four-roller centrifuge (4) and cotton collecting machine (5) composition, when tap cinder, liquid blast furnace flows into slag truck ladle along chute
Interior, slag truck ladle (1) is transported to the middle slag tank (2) positioned at ac arc furnace (3) top by locomotive, and middle slag tank (2) is by liquid height
Clinker is slowly added to ac arc furnace (3) through slag inlet (321), and flyash and acidic excipient is added by auxiliary material entrance (322),
Reach slag acidity coefficient between 1.2 ~ 1.6, four-roller centrifuge (4) are flowed into after being heated to 1480 DEG C ~ 1550 DEG C in centrifugal force
Under the action of slag dispersed and be drawn into fiber, molding fiber sprinkling size blows to cotton collecting machine (5) together；The exchange
Electric arc furnaces (3) is mainly made of furnace body (31) and bell (32) two parts, and bell (32) is located at the top of furnace body (31), is equipped with slag input
Mouth (321) and auxiliary material entrance (322)；Furnace body (31) is cylinder-like structure, and bottom is equipped with three-phase alternating current electrode (33), three intersections
It is one circular that galvanic electricity pole (33) is that three sector structures surround, between being insulated between three-phase by insulating refractories (36)
Every each electrode of three-phase alternating current electrode (33) is made of metal electrode (331) and fire resisting electrode (332) two parts respectively, gold
Category electrode (331) is welded on fan-shaped copper sheet using the diverging electrodes that a plurality of copper rod is made into and is formed, and the length of diverging electrodes is furnace
The 2/3 of base thickness degree, it is external that fan-shaped copper sheet part is exposed at furnace body (31)；Positioning metal electrode uses insulated fireproof after (311) first
Material (36) layering is made firm by ramming to the 1/3 of furnace bottom part overall thickness, then in three-phase alternating current electrode (33) position using conductive fire resisting
Material continues layering and makes firm by ramming, and rest part, which continues to be layered with insulating refractories (36), makes completion firm by ramming；Furnace body (31) side is equipped with
It overflows cinder notch (38), overflows cinder notch (38) by the extraction of furnace bottom side and upwards to 1/5 connection four-roller centrifuge of furnace body height
(4)；Inside top in excessive cinder notch (38) is equipped with temperature measuring equipment (381).
Three-phase alternating current electrode (33) is separately connected electric furnace low pressure side power supply A B C three-phase.In furnace interior shape after energization
At the rotating excitation field of fixed-direction, play the role of simultaneously to electromagnetic agitation in furnace in smelting process.
The fire resisting electrode (332) is the conductive compound ramming material of magnesium carbonaceous, resistivity≤3 × 10 after carbonization-4
Ω m, bulk density >=2.8g/cm3, compressive resistance >=20Mpa；Pole piece insulate (35) and insulating refractories (36) are insulation
The calcareous compound ramming material of magnesium.
By excessive cinder notch (38) the interior melt cinder temperature of temperature measuring equipment (381) real-time monitoring electric arc furnaces, reach 1480 DEG C in temperature
Before, keep in arc furnace liquid level to be lower than and overflow cinder notch (38), and high current is smelted, when temperature reach 1480 DEG C ~
After 1550 DEG C, middle slag tank (2) starts to supplement blast furnace melt cinder to slag inlet (321), and high temperature melt cinder is made to overflow by excessive cinder notch (38)
Out；And flyash and acidic excipient is added by auxiliary material entrance (322) while supplementing blast furnace melt cinder, reach slag acidity coefficient
To between 1.2 ~ 1.6, by adjusting electric arc furnace smelting electric current, the addition of the magnitude of recruitment and auxiliary material of blast furnace melt cinder is controlled, high temperature is made
Melt cinder endlessly flows out to four-roller centrifuge from excessive cinder notch, and melt cinder is dispersed under high speed centrifugation effect and is drawn into fibre
Dimension, molding fiber sprinkling size blow to cotton collecting machine (5) together.When needing long period blowing out or to be overhauled to electric arc furnaces
When, it needs to open residue mouth (39) and excludes furnace interior residue, to prevent cooled and solidified；It is residual using fire clay closure after the completion of maintenance
Cinder notch (39).
The present invention uses raw material for blast furnace hot slag, is not required to reheating compared with cold slag produces mineral wool, reduces the energy and disappears
Consumption reduces production cost.Furnace bottom slag mode of overflowing is used to provide high temperature melt cinder and ensure that and continuous provide stationary flow for mineral wool production line
Amount, temperature, ingredient, viscosity slag raw material, it is ensured that mineral wool production line output high standard, high-quality mineral wool product lay the foundation,
The resistance to material of electric arc furnaces is washed away when reducing charging simultaneously, ensure that the resistance to material continuous use service life.
Claims (4)
1. a kind of device of liquid blast furnace production mineral wool, mainly by slag truck ladle (1), middle slag tank (2), ac arc furnace
(3), four-roller centrifuge (4) and cotton collecting machine (5) composition, it is characterised in that: when tap cinder, liquid blast furnace is flowed into along chute
In slag truck ladle, slag truck ladle (1) is transported to the middle slag tank (2) positioned at ac arc furnace (3) top by locomotive, and middle slag tank (2) will
Liquid blast furnace is slowly added to ac arc furnace (3) through slag inlet (321), and flyash and acid is added by auxiliary material entrance (322)
Property auxiliary material, reach slag acidity coefficient between 1.2 ~ 1.6, after being heated to 1480 DEG C ~ 1550 DEG C flow into four-roller centrifuge (4) exist
Slag is dispersed and is drawn into fiber under the action of centrifugal force, and molding fiber sprinkling size blows to cotton collecting machine (5) together；
The ac arc furnace (3) is mainly made of furnace body (31) and bell (32) two parts, and bell (32) is located at furnace body (31)
Top is equipped with slag inlet (321) and auxiliary material entrance (322)；Furnace body (31) is cylinder-like structure, and bottom is equipped with three-phase alternating current
Pole (33), it is one circular that three-phase alternating current electrode (33) is that three sector structures surround, by insulating refractories between three-phase
(36) insulation gap is carried out, each electrode of three-phase alternating current electrode (33) is respectively by metal electrode (331) and fire resisting electrode (332)
Two parts composition, metal electrode (331) are welded on fan-shaped copper sheet using the diverging electrodes that a plurality of copper rod is made into and are formed, forked electricity
The length of pole is the 2/3 of furnace bottom thickness, and it is external that fan-shaped copper sheet part is exposed at furnace body (31)；Positioning metal electrode (311) is first afterwards
First made firm by ramming with insulating refractories (36) layering to the 1/3 of furnace bottom part overall thickness, then in three-phase alternating current electrode (33) position
Continue layering using conduction refractory to make firm by ramming, rest part, which continues to be layered with insulating refractories (36), makes completion firm by ramming；Furnace body
(31) side, which is equipped with, overflows cinder notch (38), overflows cinder notch (38) by the extraction of furnace bottom side and upwards to 1/5 connection of furnace body height
Four-roller centrifuge (4)；Inside top in excessive cinder notch (38) is equipped with temperature measuring equipment (381).
2. a kind of device of liquid blast furnace production mineral wool according to claim 1, it is characterised in that: temperature measuring equipment
(381) excessive cinder notch (38) interior melt cinder temperature of real-time monitoring electric arc furnaces keeps liquid level in arc furnace before temperature reaches 1480 DEG C
Lower than excessive cinder notch (38), and high current is smelted, and after temperature reaches 1480 DEG C ~ 1550 DEG C, middle slag tank (2) starts
Blast furnace melt cinder is supplemented to slag inlet (321), high temperature melt cinder is made to pass through cinder notch (38) spilling of overflowing.
3. a kind of device of liquid blast furnace production mineral wool according to claim 1, it is characterised in that: three-phase alternating current electrode
(33) be separately connected electric furnace low pressure side power supply A B C three-phase, after energization furnace interior formed fixed-direction rotating excitation field,
Play the role of simultaneously to electromagnetic agitation in furnace in smelting process.
4. a kind of device of liquid blast furnace production mineral wool according to claim 1, it is characterised in that: the fire resisting electrode
(332) for the conductive compound ramming material of magnesium carbonaceous, resistivity≤3 × 10 after carbonization-4Ω m, bulk density >=2.8g/
cm3, compressive resistance >=20Mpa；Insulating refractories (36) are the calcareous compound ramming material of magnesium of insulation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710468712.XA CN107162432B (en) | 2017-06-20 | 2017-06-20 | A kind of device of liquid blast furnace production mineral wool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710468712.XA CN107162432B (en) | 2017-06-20 | 2017-06-20 | A kind of device of liquid blast furnace production mineral wool |
Publications (2)
| Publication Number | Publication Date |
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| CN107162432A CN107162432A (en) | 2017-09-15 |
| CN107162432B true CN107162432B (en) | 2019-07-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201710468712.XA Active CN107162432B (en) | 2017-06-20 | 2017-06-20 | A kind of device of liquid blast furnace production mineral wool |
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| Country | Link |
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| CN (1) | CN107162432B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108726867A (en) * | 2018-07-26 | 2018-11-02 | 国商天时建（北京）环保科技有限公司 | A kind of rock wool production system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659309A (en) * | 2012-03-27 | 2012-09-12 | 马钢(集团)控股有限公司 | Method for processing mineral wool |
| CN103353234A (en) * | 2013-07-26 | 2013-10-16 | 朱兴发 | Bottom flowing type coaxial electric heating core graphite water gap device of electromagnetic induction slag smelting furnace |
| CN104261687A (en) * | 2014-09-07 | 2015-01-07 | 由伟 | Mineral wool based on blast furnace slag and manufacturing method of mineral wool |
| CN104909540A (en) * | 2015-05-15 | 2015-09-16 | 西安建筑科技大学 | Melting method for production of mineral wool from liquid blast furnace slag |
| CN106587634A (en) * | 2016-12-16 | 2017-04-26 | 武汉理工大学 | Marbled glass ceramics directly employing fusion blast furnace slag and preparation method of marbled glass ceramics |
-
2017
- 2017-06-20 CN CN201710468712.XA patent/CN107162432B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102659309A (en) * | 2012-03-27 | 2012-09-12 | 马钢(集团)控股有限公司 | Method for processing mineral wool |
| CN103353234A (en) * | 2013-07-26 | 2013-10-16 | 朱兴发 | Bottom flowing type coaxial electric heating core graphite water gap device of electromagnetic induction slag smelting furnace |
| CN104261687A (en) * | 2014-09-07 | 2015-01-07 | 由伟 | Mineral wool based on blast furnace slag and manufacturing method of mineral wool |
| CN104909540A (en) * | 2015-05-15 | 2015-09-16 | 西安建筑科技大学 | Melting method for production of mineral wool from liquid blast furnace slag |
| CN106587634A (en) * | 2016-12-16 | 2017-04-26 | 武汉理工大学 | Marbled glass ceramics directly employing fusion blast furnace slag and preparation method of marbled glass ceramics |
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| CN107162432A (en) | 2017-09-15 |
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Address after: 266061 Qingdao University, 93 Songling Road, Laoshan District, Qingdao City, Shandong Province Applicant after: Xu Yurui Address before: 266404 Electrical Engineering Department, Qingdao Bay College, No. 316, two road, science and education, West Coast New District, Qingdao, Shandong Applicant before: Xu Yurui |
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Effective date of registration: 20240222 Address after: No. 29 Longtan East Street, Laiwu District, Jinan City, Shandong Province, 271199 Patentee after: Shandong Luxin Guohe energy saving and Environmental Protection Technology Co.,Ltd. Country or region after: China Address before: 266061 Qingdao University, 93 Songling Road, Laoshan District, Qingdao City, Shandong Province Patentee before: Xu Yurui Country or region before: China |