CN101619469A - Crust-hitting hammer head for aluminum reduction cell and casting technique thereof - Google Patents
Crust-hitting hammer head for aluminum reduction cell and casting technique thereof Download PDFInfo
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- CN101619469A CN101619469A CN200910117260A CN200910117260A CN101619469A CN 101619469 A CN101619469 A CN 101619469A CN 200910117260 A CN200910117260 A CN 200910117260A CN 200910117260 A CN200910117260 A CN 200910117260A CN 101619469 A CN101619469 A CN 101619469A
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Abstract
The invention provides a material and a structure of a crust-hitting hammer head for an aluminum reduction cell and a casting technique thereof. The hammer head is prepared from rare earth high-chromium cast iron, and comprises the following components in percentage by weight: 1.5-2.5 percent of carbon, 0.5-1.5 percent of silicon, 0.20-1.5 percent of manganese, 25.0-35.0 percent of chromium, less than 0.05 percent of phosphorus, less than 0.05 percent of sulfur, 0.075-0.10 percent of mixed rare earth, not more than 1 percent of other impurities and the balance of iron. The crust-hitting hammer head has the structure that a steel pipe is cast in a hammer head body, and the front segment of the steel pipe and the hammer head body are cast into a whole, wherein a connection reinforcing hole is arranged at the front segment of the steel pipe; a common part of the middle segment of the steel pipe and the hammer head body forms a segment of hollow cavity; and the part of the steel pipe extending out of the chip body and a crust-hitting rod are sleeved and then fixed together through ring welding and notched welding. The technique adopts a top casting or side casting method. The crust-hitting hammer head has the characteristics of heat resisting property, corrosion resisting property, wear resisting property, light weight, falling prevention, strong technological adaptability, easy production and the like.
Description
Technical field
The invention belongs to the aluminum smelting technology technical field, be specifically related to a kind of Aluminium Electrolysis crust breaker hammer head material composition, structure and foundry engieering.
Background technology
In aluminium electrolysis process, crust breaking machine is opened electrolytical shell by certain hour, replenishes the aluminum oxide and the aluminum fluoride of some amount, keeps the concentration and the electrolytical molecular ratio of aluminum oxide in the ionogen, and the electrolytic process sustainable high efficiency is carried out.Crust breaking machine is made up of crust breaking bar, crust breaking cylinder, crust-breaking chips three parts, and the crust breaking bar couples together crust breaking cylinder and crust-breaking chips, and crust-breaking chips is connected with the method for crust breaking bar by welding.People for reduce tup consumption, improve aluminium quality, reduce labour intensity and taked a lot of measures, but prior art is in that there are the following problems in varying degrees:
1. crust-breaking chips in the process of crust breaking, be worn, corrosion and action of high temperature, use at present that Q235 forges, the tup of ZG235 casting does not contain anti-corrosion, wear-resistant, resistant to elevated temperatures alloying element, only 3～4 months life-span, high material consumption, replacing frequency height, poor working environment, labour intensity is big.
2. the iron in the tup enters in the aluminium liquid, the ferro element in the aluminium is exceeded standard, the downgrade of aluminium liquid.
3. cast in the crust-breaking chips because the existence of slag inclusion and oxide compound, quickened the spending rate of tup.
4. the tup cost that the Q235 that uses at present forges, ZG235 casts is lower, and duration of service is short; And the high tup of alloying element content is longer duration of service, but contains noble metal cost height, causes the cost performance of tup lower.
5. the solidification temperature range of hammer head material own is wide, easily produces shrinkage porosite, and tup is not fine and close.
Because the existence of the problems referred to above improves the crust-breaking chips life-span, reduces tup consumption, improve aluminium liquid quality, reduce tup and change frequency, reduce labour intensity, improve the tup inner quality, the cost performance that improves tup has great importance.
In recent years, domesticly carried out number of research projects to reducing tup consumption, obtained very big progress, the patent of application has: " crust beating hammer for aluminium electrolysis " (200610050934.1) use high temperature steel (ZG30Cr26Ni5, ZG30Cr20Ni10) to make, it also contains the nickel of (5% and 10%), the cost height when chrome content is high, also, easily crack during welding because of chromium, nickel content height." aluminum electrolyzing cell used bimetal resistance to wears and prevents the corrosion crust-breaking chips " (CN200420014301.1) adopts composite casting, soft steel or structural carbon steel are used in top, High Chrome Alloy Steel is used in the bottom, foundry technology process is wayward, two portions bonding strength is low, randomness is big, and two portions are easily separated up and down." prebaked cell for aluminum-reduction crust-breaking chips " (CN200520076577.7) uses heat-resisting alloy steel and tee T hammer handle to be cast as one.Above-mentioned back two patent tup ends and the welding of crust breaking bar plane, bonding strength is low, easily causes tup to come off, and tup is heavy.All in all, though tup has been selected for use heat-resisting, anti-corrosion, wear resisting steel all is the national standard metallic substance, not necessarily be fit to the environment of electrolysis of aluminum fully; High Chrome Alloy Steel carbon content low (about 0.3%), the melting technology complexity easily produces casting flaw, influences the life-span of tup, causes cost performance to reduce.
Summary of the invention
The objective of the invention is deficiency, a kind of cost performance height is provided, the crust-hitting hammer head for aluminum reduction cell that the replacement cycle is long at above-mentioned prior art existence.
Another object of the present invention is to provide a kind of and is easy to weld and firm welding, in light weight, the light-duty slip-off preventing crust-breaking chips that is easy to produce.
The 3rd purpose of the present invention is to provide a kind of casting technique of light-duty slip-off preventing crust-breaking chips.
For achieving the above object, the technical scheme taked of the present invention is:
A kind of crust-hitting hammer head for aluminum reduction cell, it is characterized in that: this tup is made by rare-earth and high chromium cast iron, described rare-earth and high chromium cast iron is steel scrap, ferrochrome and rare earth ferrosilicon alloy to be adjusted to branch obtain after charge calculation and melting, promptly measure by weight percentage, its composition is: carbon 1.5～2.5%, silicon 0.5～1.5%, manganese 0.20～1.5%, chromium 25.0～35.0%, phosphorus＜0.05%, sulphur＜0.05%, mishmetal 0.075～0.10%, other impurity≤1%, all the other are iron.
The light-duty slip-off preventing crust-breaking chips of a kind of used for aluminium electrolysis comprises the tup body, it is characterized in that: castingin one steel pipe in the described tup body, the leading portion of described steel pipe are provided with to be strengthened connecting hole, and being provided with steel pipe leading portion and the tup body castingin of strengthening the connection hole is one; Steel pipe stage casing and tup body common ground form one section cavity; Behind the part that steel pipe stretches out the tup body and the crust breaking bar suit, adopt boxing and 2～4 welding breach to be weldingly fixed on together.
A kind of casting technique of light-duty slip-off preventing crust-breaking chips is characterized in that: when this crust-breaking chips adopts side to annotate cast, fill molding sand in steel pipe, and set out pore; Running channel is arranged on a side of the die cavity that is formed by sand mold, and is communicated with die cavity; Molten iron or the molten steel handled well are poured into the front end of die cavity, steel pipe and strengthened connecting in the hole by running channel; Behind the casting complete, the back-up sand in cleaning gating system and the castingin steel pipe.
The casting technique of another kind of light-duty slip-off preventing crust-breaking chips, it is characterized in that: when this crust-breaking chips adopts the teeming cast, in steel pipe, fill molding sand, and the die cavity that running channel and sand mold form is set in steel pipe is communicated with, the molten iron handled well or molten steel are poured into the front end of die cavity, steel pipe by running channel and strengthen in the connection hole; Behind the casting complete, the back-up sand in cleaning gating system and the castingin steel pipe.
The material of crust-hitting hammer head for aluminum reduction cell provided by the invention, adopt rare-earth and high chromium cast iron first, heat-resisting, anti-corrosion, the wear resistance of tup have been improved, use properties has following characteristics: 1. through evidence: rare-earth and high chromium cast iron tup work-ing life is in 2, No. 3 crust breaking position life-spans of 200KA aluminium cell (950 ℃ of electrolyte temperatures) more than 300 days, reduce the replacing number of times, reduced labour intensity.2. the use of rare-earth and high chromium cast iron tup makes the content of impurity element iron in the aluminium than reducing more than three times originally.3. rare-earth and high chromium cast iron middle-weight rare earths element makes molten iron purification, and crystal boundary purifies, and the secondary oxidation tendency is little, and The amount of inclusions reduces.4. the rare-earth and high chromium cast iron in this composition range, temperature of solidification is low, and the freezing range is narrow, the use of castingin spare simultaneously, the tendency that produces shrinkage porosite is little, the tup densification.5. the acting in conjunction of rare earth element and chromium element improves wear-resisting, anti-corrosion, the resistance toheat of tup.
Aluminum electrolyzing cell used lightweight slip-off preventing crust-breaking chips provided by the invention and casting technique thereof, adopt the steel pipe castingin first, boxing and breach welding combine, with traditional castingin, weldprocedure comparison, have following characteristics: 1. adopt steel pipe as castingin spare, and be provided with on the steel pipe and strengthen connect the cavity, castingin combines firmly the strength of joint height between tup body and steel pipe, increasing the welded while of suit, tup weight reduces 10%, and the consumption of hammer head material reduces, and production cost is low.2. elongated portion is used steel pipe, suit position lengthening, and welding property is good, is easy to realize opening welding and girth welding, and welding bead length increases, and crust breaking bar and tup welding strength height make the tup high-alloying be easy to realize.3. tup adopts sand mold teeming or side to annotate cast, and Technological adaptability is strong, is easy to produce.4. this structure, technology are applicable to various crust-breaking chips materials, and operation is few, and adaptability is good, and is easy to operate, easy to implement.5. suit partly uses shaping steel tube, has saved the processing at suit position, has reduced processing charges.
Embodiment
(1) crust-hitting hammer head for aluminum reduction cell provided by the invention is optimized material composition, make by rare-earth and high chromium cast iron, described rare-earth and high chromium cast iron is steel scrap, ferrochrome and rare earth ferrosilicon alloy to be adjusted to branch obtain after charge calculation and melting, adopts middle frequency furnace or arc melting.When adjusting composition chromium, can select cheapest high carbon ferro-chrome to match with low carbon ferrochromium.Further specify below by embodiment:
Embodiment 1:
At hot metal composition carbon 1.20%, silicon 0.5%, manganese 0.2%, sulphur 0.04%, phosphorus 0.034%, chromium 33.1%, 1480 ℃ of smelting temperatures, handle with 0.01～0.015% aluminium deoxidation, leaving standstill 1440 ℃ comes out of the stove, through adding 1.0% rare earth ferrosilicon alloy FeSiRE23 in bag, the method that pours is handled through fully stirring and is skimmed, behind molten iron surface coverage pearlstone, pour into a mould, content of rare earth 0.075%, the rare earth ferrosilicon alloy granularity is controlled at 8～20mm, after the rare-earth and high chromium cast iron tup cast cleaning, in 880～910 ℃ of insulation 3h furnace cooling, stress relieving.After tup is installed in 2, No. 3 crust breaking positions, 320 days duration of service.
Embodiment 2:
At hot metal composition carbon 1.40%, silicon 1.5%, manganese 1.5%, sulphur 0.035%, phosphorus 0.036%, chromium 32.5%, 1500 ℃ of smelting temperatures, 1460 ℃ of tapping temperatures, through adding 0.9% rare earth ferrosilicon alloy FeSiRE26, content of rare earth 0.08%, treatment process is with embodiment 1, after tup is installed in 2, No. 3 crust breaking positions, and 311 days duration of service.
Embodiment 3:
In 1490 ℃ in hot metal composition carbon 1.65%, silicon 0.65%, manganese 0.45%, sulphur 0.038%, phosphorus 0.037%, chromium 30.6%, smelting temperature, 1450 ℃ of tapping temperatures, through adding 0.80% rare earth ferrosilicon alloy FeSiRE29, content of rare earth 0.10%, treatment process is with embodiment 1, after tup is installed in 2, No. 3 crust breaking positions, 323 days duration of service.
Embodiment 4:
At hot metal composition carbon 1.78%, silicon 1.35%, manganese 1.45%, sulphur 0.033%, phosphorus 0.04%, chromium 29.3%, 1500 ℃ of smelting temperatures, 1450 ℃ of tapping temperatures, through adding 0.55% rare earth ferrosilicon alloy FeSiRE41, content of rare earth 0.083%, treatment process is with embodiment 1, after tup is installed in 2, No. 3 crust breaking positions, and 335 days duration of service.
Embodiment 5:
At hot metal composition carbon 1.90%, silicon 0.75%, manganese 0.55%, sulphur 0.039%, phosphorus 0.044%, chromium 25.0%, 1500 ℃ of smelting temperatures, 1450 ℃ of tapping temperatures, through adding 0.85% rare earth ferrosilicon alloy FeSiRE26, content of rare earth 0.078%, treatment process is with embodiment 1, after tup is installed in 2, No. 3 crust breaking positions, and 318 days duration of service.
Embodiment 6:
At hot metal composition carbon 2.0%, silicon 0.95%, manganese 0.65%, sulphur 0.043%, phosphorus 0.041%, chromium 35%, 1500 ℃ of smelting temperatures, 1450 ℃ of tapping temperatures, through adding 0.95% rare earth ferrosilicon alloy FeSiRE23, content of rare earth 0.088%, treatment process is with embodiment 1, after tup is installed in 2, No. 3 crust breaking positions, 335 days duration of service.
Embodiment 7:
At hot metal composition carbon 2.1%, silicon 1.25%, manganese 0.76%, sulphur 0.037%, phosphorus 0.046%, chromium 34.1%, 1500 ℃ of smelting temperatures, 1460 ℃ of tapping temperatures, through adding 1.0% rare earth ferrosilicon alloy FeSiRE23 in bag, content of rare earth 0.075%, treatment process is with embodiment 1, after tup is contained in 2, No. 3 crust breaking positions, and 310 days duration of service.
Embodiment 8:
At hot metal composition carbon 2.30%, silicon 1.3%, manganese 1.15%, sulphur 0.046%, phosphorus 0.048%, chromium 31.8%, 1500 ℃ of smelting temperatures, 1450 ℃ of tapping temperatures, through adding 0.9% rare earth ferrosilicon alloy FeSiRE26, content of rare earth 0.08%, treatment process is with embodiment 1, after tup is installed in 2, No. 3 crust breaking positions, and 311 days duration of service.
Embodiment 9:
At hot metal composition carbon 2.2%, silicon 1.4%, manganese 0.85%, sulphur 0.034%, phosphorus 0.041%, chromium 26.6%, 1500 ℃ of smelting temperatures, 1450 ℃ of tapping temperatures, through adding 0.80% rare earth ferrosilicon alloy FeSiRE29, content of rare earth 0.089%, treatment process is with embodiment 1, after tup is installed in 2, No. 3 crust breaking positions, and 313 days duration of service.
Embodiment 10:
At hot metal composition carbon 2.4%, silicon 0.85%, manganese 0.75%, sulphur 0.028%, phosphorus 0.04%, chromium 27.3%, 1500 ℃ of smelting temperatures, 1450 ℃ of tapping temperatures, through adding 0.50% rare earth ferrosilicon alloy FeSiRE41, content of rare earth 0.095%, treatment process is with embodiment 1, after tup is installed in 2, No. 3 crust breaking positions, and 395 days duration of service.
Embodiment 11:
At hot metal composition carbon 2.5%, silicon 1.0%, manganese 0.95%, sulphur 0.037%, phosphorus 0.043%, chromium 28.5%, 1500 ℃ of smelting temperatures, 1450 ℃ of tapping temperatures, through adding 0.75% rare earth ferrosilicon alloy FeSiRE26, content of rare earth 0.083%, treatment process is with embodiment 1, after tup is installed in 2, No. 3 crust breaking positions, and 321 days duration of service.
(2) aluminum electrolyzing cell used light-duty slip-off preventing crust-breaking chips structure provided by the invention is described further by drawings and Examples:
As shown in Figure 1, among the light-duty slip-off preventing crust-breaking chips embodiment provided by the invention, castingin one steel pipe 2 in the tup body 1, steel pipe 2 adopts the standard steel pipe, and the diameter of steel pipe 2 is determined according to the diameter of crust breaking bar 3.It is that 20～30mm, quantity are that 10～20 reinforcements connect hole 201 that the leading portion of described steel pipe 2 evenly is provided with diameter, and the leading portion and tup body 1 castingin that are provided with the steel pipe 2 of strengthening connection hole 201 are one; The stage casing of steel pipe 2 and tup body 1 common ground form one section cavity; Steel pipe 2 stretches out the part of tup body 1 and inserts in the crust breaking bar 3, the mouth of pipe place of crust breaking bar 3 is provided with 2～4 welding breach 4, behind the part that steel pipe 2 stretches out tup body 1 and crust breaking bar 3 suits, adopt boxing and breach solid welding to fix on together, and adopt pin 5 fixing and welding simultaneously.
As shown in Figure 2, structure and Fig. 1 embodiment are basic identical, and difference is: the diameter of crust breaking bar 3 is little, are inserted in the steel pipe 2, and the mouth of pipe place of steel pipe 2 is provided with 2～4 welding breach 4.
(3) aluminum electrolyzing cell used light-duty slip-off preventing crust-breaking chips structure provided by the invention, can realize by following technology:
Be illustrated in figure 3 as a kind of foundary methods drawing of crust-breaking chips, when this crust-breaking chips adopts the teeming cast, in steel pipe 2, fill molding sand, and the running channel 7 that setting is communicated with die cavity in steel pipe 2, the molten iron handled well or molten steel are poured into the leading portion of the die cavity 8 that formed by sand mold 6, steel pipe 2 and strengthened connecting in the hole 201 by running channel 7, behind the casting complete, the back-up sand in cleaning gating system and the castingin steel pipe.
Be illustrated in figure 4 as the another kind of foundary methods drawing of crust-breaking chips, when this crust-breaking chips adopts side to annotate cast, in steel pipe 2, fill molding sand, and set out pore, running channel 9 is arranged on a side of the die cavity 8 that is formed by sand mold, and is communicated with die cavity 8, and molten iron or the molten steel of handling well poured into the leading portion of die cavity 8, steel pipe 2 and strengthened connecting in the hole 201 by running channel 9, behind the casting complete, the back-up sand in cleaning gating system and the castingin steel pipe.
Above-described only is preferred embodiment of the present invention.Should be understood that for the person of ordinary skill of the art, under technology enlightenment provided by the present invention, can also make other equivalent modifications and improvement, all can realize purpose of the present invention, all should be considered as protection scope of the present invention.
Claims (5)
1, a kind of crust-hitting hammer head for aluminum reduction cell, it is characterized in that: this tup is made by rare-earth and high chromium cast iron, described rare-earth and high chromium cast iron is steel scrap, ferrochrome and rare earth ferrosilicon alloy to be adjusted to branch obtain after charge calculation and melting, promptly measure by weight percentage, its composition is: carbon 1.5～2.5%, silicon 0.5～1.5%, manganese 0.20～1.5%, chromium 25.0～35.0%, phosphorus＜0.05%, sulphur＜0.05%, mishmetal 0.075～0.10%, other impurity≤1%, all the other are iron.
2, a kind of crust-hitting hammer head for aluminum reduction cell structure as claimed in claim 1, comprise the tup body, it is characterized in that: castingin one steel pipe in the described tup body, the leading portion of described steel pipe are provided with to be strengthened connecting hole, and being provided with steel pipe leading portion and the tup body castingin of strengthening the connection hole is one; Steel pipe stage casing and tup body common ground form one section cavity; Behind the part that steel pipe stretches out the tup body and the crust breaking bar suit, adopt boxing and 2～4 welding breach to be weldingly fixed on together.
3, crust-hitting hammer head for aluminum reduction cell structure according to claim 2 is characterized in that: the part that described steel pipe stretches out the tup body is weldingly fixed on the crust breaking bar, also adopts pin to fix and weld simultaneously.
4, a kind of casting technique of crust-hitting hammer head for aluminum reduction cell structure as claimed in claim 2 is characterized in that: when this crust-breaking chips adopts side to annotate cast, fill molding sand in steel pipe, and set out pore; Running channel is arranged on a side of the die cavity that is formed by sand mold, and is communicated with die cavity; Molten iron or the molten steel handled well are poured into the front end of die cavity, steel pipe and strengthened connecting in the hole by running channel; Behind the casting complete, the back-up sand in cleaning gating system and the castingin steel pipe.
5, the casting technique of another kind of crust-hitting hammer head for aluminum reduction cell structure as claimed in claim 2, it is characterized in that: when this crust-breaking chips adopts the teeming cast, in steel pipe, fill molding sand, and the die cavity that running channel and sand mold form is set in steel pipe is communicated with, the molten iron handled well or molten steel are poured into the front end of die cavity, steel pipe by running channel and strengthen in the connection hole; Behind the casting complete, the back-up sand in cleaning gating system and the castingin steel pipe.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102009159A (en) * | 2010-12-24 | 2011-04-13 | 重庆赛力盟电机有限责任公司 | Casting method of water-cooling aluminum engine base embedded with support |
| CN102259181A (en) * | 2010-11-03 | 2011-11-30 | 鞍钢集团矿业公司 | Cast-in method with function of improving wear resistance and usability of driving wheel of electric shovel |
| US20120318667A1 (en) * | 2009-12-18 | 2012-12-20 | Aluminum Corporation Of China Limited | Electrolytic Cell for Producing Primary Aluminum by Using Inert Anode |
| CN107398543A (en) * | 2016-04-20 | 2017-11-28 | 本田技研工业株式会社 | Insert casting component and its manufacture method |
| CN109055993A (en) * | 2018-10-12 | 2018-12-21 | 曲靖云铝淯鑫铝业有限公司 | A kind of crust-hitting hammer head for aluminum reduction cell and preparation method thereof |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1024690C (en) * | 1989-11-23 | 1994-05-25 | 昆明钢铁公司 | High-chromium alloy cast iron, its hot treatment process and application |
| CN2623704Y (en) * | 2003-06-13 | 2004-07-07 | 沈阳铝镁设计研究院 | Crust-breaking hammerhead |
| CN2832833Y (en) * | 2005-10-18 | 2006-11-01 | 刘怀钧 | Crust breaking chips of prebaked anode aluminium cell |
| CN1821451A (en) * | 2006-01-26 | 2006-08-23 | 左健 | Crust beating hammer for aluminium electrolysis |
| CN201068471Y (en) * | 2007-06-26 | 2008-06-04 | 中国铝业股份有限公司 | Novel shedding-proof crust-breaking chips for prebaked aluminum electrolytic cell |
-
2009
- 2009-04-22 CN CN200910117260A patent/CN101619469B/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120318667A1 (en) * | 2009-12-18 | 2012-12-20 | Aluminum Corporation Of China Limited | Electrolytic Cell for Producing Primary Aluminum by Using Inert Anode |
| US9551078B2 (en) * | 2009-12-18 | 2017-01-24 | Aluminum Corporation Of China Limited | Electrolytic cell for producing primary aluminum by using inert anode |
| CN102259181A (en) * | 2010-11-03 | 2011-11-30 | 鞍钢集团矿业公司 | Cast-in method with function of improving wear resistance and usability of driving wheel of electric shovel |
| CN102009159A (en) * | 2010-12-24 | 2011-04-13 | 重庆赛力盟电机有限责任公司 | Casting method of water-cooling aluminum engine base embedded with support |
| CN102009159B (en) * | 2010-12-24 | 2012-05-09 | 重庆赛力盟电机有限责任公司 | Casting method of water-cooling aluminum engine base embedded with support |
| CN107398543A (en) * | 2016-04-20 | 2017-11-28 | 本田技研工业株式会社 | Insert casting component and its manufacture method |
| CN109055993A (en) * | 2018-10-12 | 2018-12-21 | 曲靖云铝淯鑫铝业有限公司 | A kind of crust-hitting hammer head for aluminum reduction cell and preparation method thereof |
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| CN101619469B (en) | 2012-09-05 |
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Effective date of registration: 20191112 Address after: 100088 Aluminum Building, 62 Xizhimen North Street, Haidian District, Beijing Co-patentee after: LANZHOU University OF TECHNOLOGY Patentee after: ALUMINUM CORPORATION OF CHINA Ltd. Address before: 730335 Liancheng branch, Jianshe Ping, HeQiao Town, Yongdeng County, Lanzhou City, Gansu Province Co-patentee before: Lanzhou University Of Technology Patentee before: China Chalco Liancheng branch of Limited by Share Ltd. Effective date of registration: 20191112 Address after: 730335 Liancheng branch, Jianshe Ping, HeQiao Town, Yongdeng County, Lanzhou City, Gansu Province Co-patentee after: LANZHOU University OF TECHNOLOGY Patentee after: China Chalco Liancheng branch of Limited by Share Ltd. Address before: 730335 Jianshe Ping, Yongdeng County, Gansu Province. Lanzhou Liancheng Longxing Aluminum Co., Ltd Co-patentee before: Lanzhou University Of Technology Patentee before: LANZHOU LIANCHENG LONGXING ALUMINUM Co.,Ltd. |