CN101985164B - Copper and copper alloy casting equipment under protection of nitrogen - Google Patents
Copper and copper alloy casting equipment under protection of nitrogen Download PDFInfo
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- CN101985164B CN101985164B CN201010565756A CN201010565756A CN101985164B CN 101985164 B CN101985164 B CN 101985164B CN 201010565756 A CN201010565756 A CN 201010565756A CN 201010565756 A CN201010565756 A CN 201010565756A CN 101985164 B CN101985164 B CN 101985164B
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Abstract
The invention discloses copper and copper alloy casting equipment under the protection of nitrogen. The equipment comprises a crystallizer assembly, and a secondary water cooling device and a casting well which are positioned below the crystallizer assembly. The equipment is characterized in that: an airtight protective cover is arranged between the crystallizer assembly and the casting well; the secondary water cooling device is connected to a secondary water cooling-deoxidizing device through a secondary cooling water pipe which is connected with a nitrogen injection pipe and a valve; and the bottom of the casting well is provided with a cooling water return pipe. Under the sealing protection of the nitrogen, outside air is prevented from entering the casting well so as not to contact high-temperature copper ingots in the casting process, the copper ingots are prevented from being oxidized by the air, the surface non-oxidation casting of industrial pure copper, high copper and a white copper alloy is realized, and the aims of reducing the oxidation loss of copper metal and production cost are fulfilled.
Description
Technical field
The invention belongs to metallurgical technology field, relate to a kind of copper and copper alloy casting ingot equipment, mainly be adapted to the ingot casting of diameter of phi 150mm (or plate ingot of suitable section) and above copper and copper alloy with nitrogen protection.
Background technology
The smelting temperature of red copper, phosphorized copper, oxygen-free copper, silver-bearing copper, high-copper and copper-nickel alloy alloy is generally between 1120-1350 ℃.At high temperature, the surface of this type alloy can not form compact protective film, and very easily oxidation forms thicker oxide skin, and ingot casting quality and following process are impacted.When producing oxygen-free copper, oxygen can also permeate to ingot casting, influences the performance of following process goods.At present; The outer surface of ingot casting in the casting process is not taked any safeguard measure basically both at home and abroad; Particularly diameter is at Φ 150mm and above ingot casting (or plate ingot of suitable section), and often there is very serious oxidative phenomena in the surface, and following process is produced harmful effect.Oxide skin increases the wearing and tearing of recipient, pressure ram, pecker, and the life-span of extrusion die is reduced greatly.Oxide skin is pressed into and causes product defect in the fabricated product, causes goods to be scrapped when serious.Metallic copper oxidation meeting causes metal loss, increases production cost.
In adopting the vertical semi-continuous casting process; Can not effectively protect the ingot casting surface; Main cause is following: the existing crystallizer of the first is the die cavity of an ingot casting moulding; Crystallizer only can be taken away the heat about the 15-30% of high-temperature copper liquid, can't the copper ingot that solidify be cooled to below the oxidizing temperature.It two is after the ingot solidification, because linear shrinkage and between crystallizer and ingot casting, form air gap makes between ingot casting surface and the crystallizer and can't carry out conduction heat transfer.At this moment, the high-temperature region temperature of ingot casting heart portion raises the temperature on ingot casting surface near the fusing point of copper and copper alloy through conduction heat transfer fast.The ingot casting ambient air is the ingot casting of oxidation high temperature rapidly.It three is, ingot casting is before the cooling of secondary water breakthrough, and surface temperature is very high, and secondary cooling water is the ingot casting of oxidation high temperature further.Secondary cooling water is dissolved with a large amount of oxygen through cooling tower spray atomizing cooling in the water.Under the situation of water body spray and strong circulation, the dissolved oxygen in water amount reaches 14g/m
.A diameter is Φ 260-440mm; Length is copper and the copper alloy casting ingot of 5.5-6.5m; The casting time is approximately 1-2h; In the casting process of an ingot casting; The circulation total amount of secondary water is 80-100 m
, is equivalent to have the oxygen of 1.22kg to contact with ingot casting through the ingot casting surface.Very strong affinity is arranged between metal about 500-900 ℃ and the dissolved oxygen, generate loose cupric oxide, the metal under all right further oxidation oxide skin of oxygen.1.22kg oxygen be enough to the fully oxidation of ingot casting surface.It four is; The pressure of supply water of secondary water is at 3-5kg/cm
; Secondary cooling apparatus sprays to ingot casting surface is not pure water but the two-phase fluid of air-water, sneaks into the air oxidation high temperature ingot casting strongly in the water.It five is; The secondary cooling can not be cooled to the ingot casting of diameter more than Φ 250mm (or plate ingot of suitable section) below 185 ℃ (copper begins the temperature of oxidation) effectively; Big specification ingot casting heart portion temperature through secondary cooling is still very high, is exposed to airborne copper ingot and also can continues oxidation.It six is that three cooling waters in the ingot casting well contain very high oxygen, also can carry out further oxidation to big specification ingot casting.The ingot casting specification is bigger, casting speed is low more, ingot surface temperature is high more, the needed time of cooling is long more, and the ingot casting surface oxidation is also serious more.
Summary of the invention
The objective of the invention is provides a kind of copper and copper alloy casting ingot equipment with nitrogen protection to the deficiency that exists in the prior art.
The objective of the invention is to realize through following technical proposals:
A kind of copper and copper alloy casting ingot equipment with nitrogen protection, it comprises the crystallizer assembly, is positioned at the secondary water cooling plant and the ingot casting well of said crystallizer assembly below, it is characterized in that: be provided with the air-tightness protective cover between said crystallizer assembly and the ingot casting well; Said secondary water cooling plant through the secondary cooling water pipe be connected to the secondary water-cooled but-delivery port of device for deoxidizing, and on the secondary cooling water pipe, be connected with nitrogen ascending pipe and valve; Said casting bottom is provided with the cooling water return duct three times, its be connected to said secondary water-cooled but-water inlet of device for deoxidizing; Said secondary water-cooled but-device for deoxidizing comprises the high-order cooling bath of cooling tower, open type; The high-order bosh of said open type is positioned at the bottom of said cooling tower; Said three cooling water return ducts are connected to the water inlet of said cooling cat head, and said secondary water-cooled but-device for deoxidizing also comprises:
Air-tightness low level deoxidation tank, the side lower part of said high-order bosh is connected with the upper lateral part of said air-tightness low level deoxidation tank through pipeline;
At least one nitrogen distributing pipe; It is installed in the bottom of said air-tightness low level deoxidation tank; And on said nitrogen distributing pipe, have pore; Said nitrogen distributing pipe is connected on the nitrogen header pipe in the said air-tightness low level deoxidation tank outside through pipeline, and on this nitrogen header pipe, valve is installed;
Gas discharge pipe, it is installed in the top of said air-tightness low level deoxidation tank, and on the said gas discharge pipe valve is installed;
Water pump, its water inlet are connected on the pipeline that feeds in the said air-tightness low level deoxidation tank, and its delivery port is connected to said secondary cooling water pipe.
According to the said equipment, it is characterized in that said crystallizer assembly comprises graphite cannula, red copper cover and water jacket from inside to outside, form water cavity between said red copper cover and the water jacket, said water jacket is provided with water inlet and delivery port.
According to the said equipment, it is characterized in that said secondary water cooling plant is annular or flat cavity, said cavity side top has water inlet, has water jet at said annular housing near the interior side-lower of ingot casting.
According to the said equipment; It is characterized in that; Said secondary water-cooled but-device for deoxidizing also comprises the nitrogen gas concn detector, it is installed in the said air-tightness low level deoxidation tank, its signal output part is connected with the controller that is used to control the valve of installing on the said nitrogen header pipe.
According to the said equipment, it is characterized in that, said secondary water-cooled but-device for deoxidizing also comprises the water proof grid, it is installed in middle part in the said air-tightness low level deoxidation tank.
According to the said equipment, it is characterized in that, below said crystallizer assembly, be provided with the copper ingot length detector.
According to the said equipment, it is characterized in that, in the air-tightness protective cover, be provided with the nitrogen content detector.
According to the said equipment, it is characterized in that on the air-tightness protective cover, be provided with the nitrogen reflux control device, the signal output part of said nitrogen content detector is connected the signal input part of said nitrogen reflux control device.
According to the said equipment, it is characterized in that be provided with the oxygen content detector in the air-tightness protective cover outside, the signal output part of this oxygen content detector is connected with the control signal input of the blower fan that is arranged on the air-tightness protective cover outside.
The relative prior art of the present invention has following beneficial effect:
1, the present invention adopts the air-tightness protective cover to carrying out seal protection between crystallizer outlet and the ingot casting well head, prevents in the process of casting, and extraneous air gets into the copper ingot contact of ingot casting well with high temperature, guarantees not oxidation by air of copper ingot.
2, the present invention adopt the secondary water-cooled but-device for deoxidizing; Secondary cooling water to getting into the ingot casting well carries out the deoxidation degasification; And utilizing water pump to be transported to the secondary cooling apparatus in the ingot casting well, oxygen-free gas in the secondary water of guaranteeing to contact with ingot casting does not cause the ingot casting surface oxidation.
3, be gathered in three cooling waters in the ingot casting well and be dissolved with nitrogen, oxygen-free gas can not cause oxidation to big specification ingot casting, is adapted to the ingot casting of diameter of phi 150mm (or quite plate ingot of section) and above copper and copper alloy especially.
Description of drawings
Fig. 1 is the copper of band nitrogen protection of the present invention and the structural representation of copper alloy casting ingot equipment;
Fig. 2 be secondary water-cooled of the present invention but-structural representation of device for deoxidizing.
The specific embodiment
Through specific embodiment structure of the present invention and operation principle are carried out detailed explanation below.
Referring to Fig. 1, the copper of band nitrogen protection of the present invention and copper alloy casting ingot equipment, it comprises crystallizer assembly 1, is positioned at the secondary water cooling plant 8 and the ingot casting well 5 of said crystallizer assembly 1 below, is provided with air-tightness protective cover 4 between crystallizer assembly 1 and the ingot casting well 5; Secondary water cooling plant 8 through secondary cooling water pipe 6 be connected to the secondary water-cooled but-delivery port of device for deoxidizing 33, and on secondary cooling water pipe 6, be connected with nitrogen ascending pipe and valve 7; Casting well 5 bottoms are provided with cooling water return duct 14 three times, its be connected to the secondary water-cooled but-water inlet of device for deoxidizing 33.
Secondary water cooling plant 8 is annular or flat cavity (shape of cross section that depends on ingot casting), and top, cavity side has water inlet, has water jet 20 at cavity near the interior side-lower of ingot casting.
Below crystallizer assembly 1, be provided with copper ingot length detector 15.In air-tightness protective cover 4, be provided with nitrogen content detector 10.On air-tightness protective cover 4, be provided with nitrogen reflux control device 9, the signal output part of nitrogen content detector 10 is connected the signal input part of nitrogen reflux control device 9.(teeming platform 3 is other) is provided with oxygen content detector 11 in the air-tightness protective cover outside, and the signal output part of oxygen content detector 11 is connected with the control signal input of the blower fan 12 that is arranged on the air-tightness protective cover outside.
Referring to Fig. 2 describe in detail the secondary water-cooled but-structure of device for deoxidizing 33.The secondary water-cooled but-device for deoxidizing 33 comprises the high-order cooling bath 22 of cooling tower 21, open type; The high-order bosh 22 of open type is positioned at the bottom of cooling tower 21; Three cooling water return ducts 14 are connected to the water inlet of cooling cat head; And the secondary water-cooled but-device for deoxidizing 33 also comprises: air-tightness low level deoxidation tank 23, the side lower part of high-order bosh 22 is connected with the upper lateral part of air-tightness low level deoxidation tank 23 through pipeline; At least one nitrogen distributing pipe 24; It is installed in the bottom of air-tightness low level deoxidation tank 23; And on nitrogen distributing pipe 24, have pore; Nitrogen distributing pipe 24 is connected on the nitrogen header pipe 25 in air-tightness low level deoxidation tank 23 outsides through pipeline, and valve 26 is installed on nitrogen header pipe 25; Gas discharge pipe 27, it is installed in the top of air-tightness low level deoxidation tank 23, and valve 28 is installed on the gas discharge pipe 27; Water pump 29, its water inlet are connected on the pipeline 31 that feeds in the air-tightness low level deoxidation tank 23, and its delivery port is connected to secondary cooling water pipe 6.The secondary water-cooled but-device for deoxidizing 33 also comprises nitrogen gas concn detector 25, it is installed in the air-tightness low level deoxidation tank 23, its signal output part is connected with the controller (Fig. 2 is not shown) that is used for controlling the valve of installing on the said nitrogen header pipe 25 27.The secondary water-cooled but-device for deoxidizing also comprises water proof grid 30, it is installed in middle part in the said air-tightness low level deoxidation tank 23, its objective is the increase resistance to water-flow, prevents that the very high water of oxygen content that from high-order cold rinse bank 22, flows into from directly getting into the water sucking mouth.
See figures.1.and.2 at present and describe the operation principle of this equipment:
Before beginning casting, dummy bar head 2 and crystallizer 1 aligned position, the borehole wall of crystallizer 1, seal closure 4 and ingot casting well 5, shaft bottom form an airtight space.At this moment, valve 7 is opened, and to ingot casting well 5 logical nitrogen, air is through 9 emptyings of nitrogen reflux control device in the well through valve 7, pipeline 6 and secondary water cooling plant 8 for the nitrogen source of the gas.When nitrogen content detector 10 detects the discharging nitrogen gas concn and surpasses 99%, the floss hole of the automatic closing volume control device 9 of control system and valve 7, and the opening pressure of safety valve that recirculation control device 9 is set automatically is 1.5kg/cm.In casting process, along with nitrogen in the rising of water level in the well and the secondary water overflows, borehole pressure can progressively rise, and when pressure surpasses when setting safe pressure, recirculation control device 9 is opened pressure releases.Simultaneously, blower fan 12 is opened, and the nitrogen that purges well head reaches level of security.Begin to dash dress nitrogen from the ingot casting well and begin, the oxygen content detector 11 under the casting platform measures the operating position oxygen content continuously.In case oxygen content surpasses setting range, buzzer warning, blower fan 12 is opened.
At the casting initial stage, copper liquid only contacts with crystallizer with ingot casting, and the primary cooling water in the crystallizer does not directly contact with metallic copper all the time, and primary cooling water does not directly impact copper ingot surface oxidation situation.Below the crystallizer shown in the figure three 1, copper ingot length detector 15 is installed, be used to detect the casting length and the casting speed of copper ingot, water pump start-stop, output, pressure of supply water that control secondary water cooling plant 8 uses.
Do not contain oxygen in order to guarantee to cast in cooling water and the cooling water in the secondary water cooling plant in the well; With the cooling water of casting in the well through water pump pump into the secondary water-cooled but-cooling tower of device for deoxidizing in, the cooling water that refluxes in the ingot casting well is transported in the air-tightness low level deoxidation tank 23 after cooling tower 21 coolings.The by-pass valve control 26 of nitrogen pipeline at the bottom of the opening groove feeds nitrogen to bottom land, and the nitrogen of feeding forms a string bubble disperse and is distributed in the trough inner water body.Because the dividing potential drop of oxygen is zero in the bubble, thereby impel the oxygen that dissolves in the water to separate out and in bubble, spread, oxygenous bubble emerges.When the air pressure of trough inner water body superjacent air space reaches 0.5-0.8kg/cm
; Open gas emitting valve 27 emptyings, reach and remove the oxygen that dissolves in the water body.When the detected value of nitrogen monitoring probe 25 reached setting value, the water body of process deoxidation pumped into the secondary water cooling plant 8 in the ingot casting well 5 by water pump 29 through secondary cooling water pipe 6.
At the casting initial stage, copper liquid only contacts with crystallizer assembly 1 with ingot casting, and the primary cooling water in the crystallizer assembly does not directly contact with metallic copper all the time.The casting length and the casting speed of 15 pairs of copper ingots of copper ingot length detector of crystallizer assembly below are implemented on-line monitoring., the measured value of the long sniffer of ingot (shows that the ingot casting head is about to get into the secondary water cooling plant) when reaching setting value; The secondary water-cooled but-water pump of device for deoxidizing 29 opens; Supply water through the secondary water-cooling apparatus 8 of secondary cooling water pipe 6 in the ingot casting well, secondary water directly cools off the ingot casting surface.Because do not have in oxygen, the secondary water also not dissolved oxygen in the well, the ingot casting surface keeps the metal true qualities of light.Secondary cooling water lodges in the shaft bottom and forms three cooling waters, and accumulating of three cooling waters highly is 4-7m (surpass setting height, other has special-purpose water pump that water is evacuated to hot water storgae), and three times cooling water plays a significant role to the ingot casting cooling that diameter surpasses Φ 250mm.Be gathered in three cooling waters in the ingot casting well and be dissolved with nitrogen, oxygen-free gas can not cause oxidation to big specification ingot casting.Ingot casting is cooled in well below 60 ℃ and goes out well.
Claims (9)
1. copper and copper alloy casting ingot equipment with a nitrogen protection, it comprises the crystallizer assembly, is positioned at the secondary water cooling plant and the ingot casting well of said crystallizer assembly below, it is characterized in that: be provided with the air-tightness protective cover between said crystallizer assembly and the ingot casting well; Said secondary water cooling plant through the secondary cooling water pipe be connected to the secondary water-cooled but-delivery port of device for deoxidizing, and on the secondary cooling water pipe, be connected with nitrogen ascending pipe and valve; Said casting bottom is provided with the cooling water return duct three times, its be connected to said secondary water-cooled but-water inlet of device for deoxidizing; Said secondary water-cooled but-device for deoxidizing comprises the high-order cooling bath of cooling tower, open type; The high-order bosh of said open type is positioned at the bottom of said cooling tower; Said cooling water return duct is connected to the water inlet of said cooling cat head, and said secondary water-cooled but-device for deoxidizing also comprises:
Air-tightness low level deoxidation tank, the side lower part of said high-order bosh is connected with the upper lateral part of said air-tightness low level deoxidation tank through pipeline;
At least one nitrogen distributing pipe; It is installed in the bottom of said air-tightness low level deoxidation tank; And on said nitrogen distributing pipe, have pore; Said nitrogen distributing pipe is connected on the nitrogen header pipe in the said air-tightness low level deoxidation tank outside through pipeline, and on this nitrogen header pipe, valve is installed;
Gas discharge pipe, it is installed in the top of said air-tightness low level deoxidation tank, and on the said gas discharge pipe valve is installed;
Water pump, its water inlet are connected on the pipeline that feeds in the said air-tightness low level deoxidation tank, and its delivery port is connected to said secondary cooling water pipe.
2. equipment according to claim 1 is characterized in that, said crystallizer assembly comprises graphite cannula, red copper cover and water jacket from inside to outside, forms water cavity between said red copper cover and the water jacket, and said water jacket is provided with water inlet and delivery port.
3. equipment according to claim 2 is characterized in that, said secondary water cooling plant is annular or flat cavity, and said cavity side top has water inlet, has water jet at said annular housing near the interior side-lower of ingot casting.
4. equipment according to claim 1; It is characterized in that; Said secondary water-cooled but-device for deoxidizing also comprises the nitrogen gas concn detector, it is installed in the said air-tightness low level deoxidation tank, its signal output part is connected with the controller that is used to control the valve of installing on the said nitrogen header pipe.
5. equipment according to claim 1 is characterized in that, said secondary water-cooled but-device for deoxidizing also comprises the water proof grid, it is installed in middle part in the said air-tightness low level deoxidation tank.
6. equipment according to claim 3 is characterized in that, below said crystallizer assembly, is provided with the copper ingot linear transducer.
7. equipment according to claim 3 is characterized in that, in the air-tightness protective cover, is provided with the nitrogen content monitoring sensor.
8. equipment according to claim 7 is characterized in that, on the air-tightness protective cover, is provided with the nitrogen reflux control device, and the output of said nitrogen content monitoring sensor is connected the signal input part of said nitrogen reflux control device.
9. equipment according to claim 3 is characterized in that, is provided with oxygen concentration sensor in the air-tightness protective cover outside, and the signal input part of this sensor is connected with the control signal input of the blower fan that is arranged on the air-tightness protective cover outside.
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| CN102294465A (en) * | 2011-09-28 | 2011-12-28 | 西南铝业（集团）有限责任公司 | Melt protection device and method |
| CN102605189B (en) * | 2012-03-22 | 2013-07-17 | 金川集团有限公司 | Method for preparing copper and copper-alloy cast ingots by electroslag refining technology |
| CN102672127A (en) * | 2012-05-29 | 2012-09-19 | 金川集团股份有限公司 | Device and method for manufacturing copper and copper alloy tube blank |
| CN103144999B (en) * | 2013-03-14 | 2015-09-16 | 慈溪市玖发铜业有限公司 | The cord reeling method of copper cash |
| CN106001524B (en) * | 2016-07-19 | 2017-10-27 | 中国瑞林工程技术有限公司 | Framework Cu alloy material casts unit cooling system and its operating method |
| CN116727620B (en) * | 2023-08-16 | 2023-10-10 | 江苏兴成新材料有限公司 | Copper and copper alloy ingot casting equipment with nitrogen protection |
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| JPH05318031A (en) * | 1992-05-12 | 1993-12-03 | Yoshida Kogyo Kk <Ykk> | Method for cooling in continuous casting, and device and mold therefor |
| CN1132710C (en) * | 2001-03-22 | 2003-12-31 | 上海交通大学 | Horizontal conticaster dedicated for Mg-alloy |
| RU2211745C1 (en) * | 2002-09-04 | 2003-09-10 | Захаров Владимир Алексеевич | Plant for continuous vertical casting of tubular blanks |
| CN1208153C (en) * | 2002-10-09 | 2005-06-29 | 北京科技大学 | Ferroalloy continuous casting equipment and method |
| CN100515605C (en) * | 2007-10-22 | 2009-07-22 | 倪智勇 | Crystallizer and horizontal continuous casting machine set using same |
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