CN110117728A - A kind of melting scalping process of copper ingot - Google Patents
A kind of melting scalping process of copper ingot Download PDFInfo
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- CN110117728A CN110117728A CN201910453931.XA CN201910453931A CN110117728A CN 110117728 A CN110117728 A CN 110117728A CN 201910453931 A CN201910453931 A CN 201910453931A CN 110117728 A CN110117728 A CN 110117728A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/001—Continuous casting of metals, i.e. casting in indefinite lengths of specific alloys
- B22D11/004—Copper alloys
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/108—Feeding additives, powders, or the like
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/111—Treating the molten metal by using protecting powders
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0026—Pyrometallurgy
- C22B15/006—Pyrometallurgy working up of molten copper, e.g. refining
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a kind of melting scalping process of copper ingot, belong to copper processing techniques field, the steps include: (1) ingredient, melting；(2) slag, constituent analysis are fished out, stands and comes out of the stove；(3) cast；(4) sawing；(5) face is milled.Qualified copper ingot is provided under the premise of can guarantee melting yield rate by the technical solution, and reduces casting defect, reduce product restructuring and melts down bring increased costs, improves production efficiency.
Description
Technical field
The invention belongs to copper processing techniques field more particularly to a kind of melting scalping process of copper ingot.
Background technique
Low end client currently on the market is mostly the rouleau supply of material, and volume is again relatively lighter, and the melting of rouleau copper strips mills face work
Skill is melting, cast, sawing, milling face, and with the continuous aggravation of market competition, the part weight with volume is also being continuously improved in client,
In order to improve benefit, meets customer requirement, realize that part brings up again liter, increase melting mould wall thickness, so that the ingot casting that cast obtains
Thickness is very big, but problem is big thickness ingot casting, must just carry out four facing cuts in principle to eliminate surface defect, and if using four
Facing cut, the opposite Double Milling for aggravating to carry out before, milling amount greatly increase, and cause the reduction of melting brass yield rate, to full factory
Yield rate also bring very big influence, meanwhile, the copper water being poured into copper ingot mould, due to copper ingot mould chilling effect and it is first
It is initially formed copper ingot shell, gap is formed between copper ingot shell and copper ingot mould and hinders the heat transfer between internal copper water and copper ingot mould,
And the solidification rate of internal copper water is greatly lowered, for big thickness ingot casting, when the solidification of internal copper water
Between it is longer so that internal copper water constituent be easy to produce segregation, non-metallic inclusion aggregation and shrinkage cavity and it is loose the defects of.
But due to the Solidification Characteristics of ingot casting, currently, there is no good methods and techniques measure thoroughly to eliminate in Casting Ingot Solidification Process
The defects of generated drawbacks described above, the stomatas of especially some inside ingots, shrinkage cavity, ingot casting outer surface be can't see at all, to
It is showed when rolled bands volume annealing cleaning, causes product to restructure or melt down, seriously affect production cost or production plan.
Summary of the invention
Technical problems to be solved by the inivention
The invention reside in overcome in the prior art big thickness ingot casting need to eliminate surface defect using four facing cuts so that milling amount is big
It is big to increase, lead to the reduction of melting brass yield rate, and big thickness ingot casting is easy to produce segregation in cast, non-metallic inclusion gathers
Collection and shrinkage cavity and it is loose the deficiencies of, provide a kind of melting scalping process of copper ingot, can be protected using technical solution of the present invention
There is provided qualified copper ingot under the premise of card melting yield rate, and reduce casting defect, reduce product restructuring and melt down bring at
This increase improves production efficiency.
Technical solution
In order to achieve the above objectives, technical solution provided by the invention are as follows:
A kind of melting scalping process of copper ingot of the invention, its step are as follows:
(1) ingredient, melting
By raw material according to the ingredient standard of product it is weighted after, be added melting furnace in carry out heating fusing, add refining agent, and
It is stirred；
(2) slag, constituent analysis are fished out, stands and comes out of the stove
After fishing out net copper water liquid level lime-ash before coming out of the stove, 2-3min is sufficiently stirred from top to bottom, guarantees that ingredient and temperature are uniform, makes gas
Slag is fished out in evolution again, reduces slag inclusion, and addition charcoal covering is protected, detects chemical component, and ingredient qualification stands 6-10min
Degasification, temperature requirement reach 1050-1080 DEG C and come out of the stove；
(3) cast
Copper water is poured into water mold by flow tube ontology, cast is carried out using dedicated draw-casting machine, casting speed is
17rpm-18rpm, hydraulic pressure are 0.18-0.2 MPa, use coverture to cover copper water during cast；
(4) sawing
The copper ingot of cast is cut into length required for us, push rod furnace can be put into and heated；
(5) face is milled
Milling face is carried out to ingot casting upper and lower surfaces first, in the discharge port of face milling machine, increases a dry brushing machine, then to ingot casting side
Face carries out dry brush, and the drafts for adjusting wire brush is 1-1.2cm, the black silk of borax is removed, finally with sanding machine to four arc chord angles
It polishes, and to ingot casting side face defects critical regions, is also further polished with sanding machine.
As a further improvement of that present invention, the specific steps of refining agent are added in step (1) are as follows: powdery refining agent is placed
In powder spraying pot, the nitrogen using purity not less than 99.99% is slowly blown into powdery refining agent inside copper liquid through piping, is removed
Degasification is carried out while miscellaneous refining, wherein nitrogen pressure is 0.2 ~ 0.5MPa, and the time of dusting is 40-50min, and refining temperature is protected
It holds at 1050~1060 DEG C；After refining agent is added, increase nitrogen pressure to 0.5MPa.
As a further improvement of that present invention, the head piece of flow tube ontology tilts down setting in step (3), and tilt angle is
10-15 °, and the length of flow tube ontology is 280mm.
As a further improvement of that present invention, the specific steps of coverture are added in step (3) are as follows: firstly, preparing by quality
Ratio is melted subsequently into borax furnace, and the coverture of molten condition is added to copper liquid table using spoon when addition
Face, makes it be uniformly covered on the surface of crystallizer copper liquid, and addition in three minutes is primary.
As a further improvement of that present invention, in step (3): the coverture, by mass percentage, by following component groups
At: 75% borax, 10% KCl, 15% NaCl.
As a further improvement of that present invention, in step (5), polishing 1cm is carried out to four arc chord angles with sanding machine, and to casting
Ingot side face defects critical regions are also further polished 3-3.5cm with sanding machine to side.
As a further improvement of that present invention, in step (3) cast, being tested using horizontal ruler ensures the water of crystallizer
It is flat.
Beneficial effect
Using technical solution provided by the invention, compared with prior art, there is following remarkable result:
(1) the melting scalping process of a kind of copper ingot of the invention, the specific steps of refining agent are as follows: powdery refining agent is placed on
In powder spraying pot, the nitrogen using purity not less than 99.99% is slowly blown into powdery refining agent inside copper liquid through piping, is cleaned
Degasification is carried out while refining, wherein nitrogen pressure is 0.2 ~ 0.5MPa, and the time of dusting is 40-50min, and refining temperature is kept
At 1050~1060 DEG C；After refining agent is added, increase nitrogen pressure to 0.5MPa.It should be understood that the present invention utilizes
Refining agent in powder spraying pot is uniformly added slowly in copper water by nitrogen, makes the fully oxidized floating of molten bath impurities at bottom, when miscellaneous
When matter is oxidized to oxide, clinker is removed by skimming operation；After refining agent is added, by increasing nitrogen pressure,
On the one hand it can play the role of degasification, on the other hand can play certain Gas Stirring, improve the quality of copper water.
(2) the melting scalping process of a kind of copper ingot of the invention, the head piece of flow tube ontology, which tilts down, in step (3) sets
It sets, tilt angle is 10-15 °, and the length of flow tube ontology is 280mm.It should be understood that the length of flow tube ontology of the present invention
It is arranged with the angle of head piece, can copes in the middle part of crystallizer caused by ingot casting thickens and cooling velocity existing for surrounding is inconsistent existing
As.Need to be further elaborated with: the present invention tilts down setting by the head piece of flow tube ontology, on the one hand, is not breaking
In the case where bad surface coating, the height of head piece positional distance liquid level can obviously reduce, it is convenient further to exclude in copper water not
On the other hand escaping gas can increase the speed that copper water flows into crystallizer, copper water flow direction is clear, have certain impact, thus
There is certain stirring to copper water, transmits temperature to surrounding faster, and then keep a cooling effect of copper water more preferable, be conducive to
The generation of the defects of formation of ingot casting scull and uniform growth, reduction shrinkage cavity, crackle, therefore original casting speed can not be reduced, it protects
Production efficiency is demonstrate,proved, and 0.18-0.2 MPa is increased to by secondary cooling hydraulic pressure, it is ensured that the effect of secondary cooling.
(3) the melting scalping process of a kind of copper ingot of the invention, the middle specific steps that coverture is added of step (3) are as follows:
Firstly, preparing ratio in quality, melted subsequently into borax furnace, using spoon by the covering of molten condition when addition
Agent is added to copper liquid surface, so that it is uniformly covered on the surface of crystallizer copper liquid, addition in three minutes is primary, which presses
Mass percent is made of following components: 75% borax, 10% KCl, 15% NaCl.It should be understood that it is well known that
When cast, the borax of molten condition is generally added on copper water surface as coverture, prevents oxidation and the volatilization of metal, the present invention
Replace borax by adding above-mentioned coverture, other than playing the role of borax, simultaneously as the coverture density ratio copper of addition
Water is small, is located at the impurity metallic elements inside copper water surface, with that layer of copper water of contact and reacts, slag is generated, by not
Disconnected absorption chemical combination slag making, can guarantee the pure of copper water to the greatest extent, make slag cooled and solidified at the top of liquid level, the copper being cleaned
Water is since impurity is reduced, natural subsidence, new copper water supplement, then addition coverture in due course, continues to purify, move in circles.Therefore,
The present invention can further function as removal of impurities by ingredient and the content setting of coverture and the specific addition step of coverture
Effect, to preferably promote the quality of entire ingot casting.
(4) the melting scalping process of a kind of copper ingot of the invention, it is same to side by carrying out milling face to upper and lower surfaces
It does not mill, is then ensured by the dry brush in side and sanding machine as side quality, so that maintaining original Double Milling avoids four
Facing cut bring decrease in yield problem improves the performance of enterprises.
Specific embodiment
To further appreciate that the contents of the present invention, below with reference to embodiment, the present invention is described in detail.
Embodiment 1
A kind of melting scalping process of copper ingot of the present embodiment, its step are as follows:
(1) ingredient, melting
By raw material according to the ingredient standard of product it is weighted after, be added melting furnace in carry out heating fusing, add refining agent, and
It is stirred.Specifically in the present embodiment: the specific steps of refining agent being added in step (1) are as follows: powdery refining agent is placed on
In powder spraying pot, the nitrogen using purity not less than 99.99% is slowly blown into powdery refining agent inside copper liquid through piping, is cleaned
Degasification is carried out while refining, wherein nitrogen pressure is 0.2 ~ 0.5MPa, and the time of dusting is 40-50min, and refining temperature is kept
At 1050~1060 DEG C；After refining agent is added, increase nitrogen pressure to 0.5MPa.
It should be understood that the refining agent in powder spraying pot is uniformly added slowly in copper water by the present invention using nitrogen,
Make the fully oxidized floating of molten bath impurities at bottom, when impurity is oxidized to oxide, remove clinker by skimming operation；Refining
After agent is added, by increasing nitrogen pressure, it on the one hand can play the role of degasification, on the other hand can play certain
Gas Stirring effect, improves the quality of copper water.It should be further noted that: nitrogen pressure, dust time and essence in the present invention
Refine temperature setting can preferably impurity removing refining while carry out degasification.
(2) slag, constituent analysis are fished out, stands and comes out of the stove
After fishing out net copper water liquid level lime-ash before coming out of the stove, 2-3min is sufficiently stirred from top to bottom, guarantees that ingredient and temperature are uniform, makes gas
Slag is fished out in evolution again, reduces slag inclusion, and addition charcoal covering is protected, detects chemical component, and ingredient qualification stands 6-10min
Degasification, temperature requirement reach 1050-1080 DEG C and come out of the stove.
(3) cast
Specifically in the present embodiment: copper water being poured into water mold by flow tube ontology, is drawn using dedicated draw-casting machine
Casting, casting speed 17rpm-18rpm, hydraulic pressure are 0.18-0.2 MPa, use coverture to cover copper water during cast
Lid.
Specifically in the present embodiment: the head piece of flow tube ontology tilts down setting, tilt angle 10- in step (3)
15 °, and the length of flow tube ontology is 280mm.It should be understood that the length of flow tube ontology of the present invention and the angle of head piece are set
It sets, the inconsistent phenomenon of cooling velocity existing for the middle part of crystallizer caused by ingot casting thickens and surrounding can be coped with.It needs further to have
Body illustrates: the present invention tilts down setting by the head piece of flow tube ontology, on the one hand, in the feelings for not destroying surface coating
Under condition, the height of head piece positional distance liquid level can obviously reduce, it is convenient further to exclude non-escaping gas in copper water, another party
Face can increase the speed that copper water flows into crystallizer, and copper water flow direction is clear, has certain impact, to have certain stir to copper water
Mix, transmit temperature to surrounding faster, and then keep a cooling effect of copper water more preferable, be conducive to ingot casting scull formation and
The generation of the defects of uniform growth, reduction shrinkage cavity, crackle, therefore original casting speed can not be reduced, guarantee production efficiency, and pass through
Secondary cooling hydraulic pressure increases to 0.18-0.2 MPa, it is ensured that the effect of secondary cooling.
Specifically in the present embodiment: the specific steps of coverture being added in step (3) are as follows: firstly, ratio is prepared in quality,
It is melted subsequently into borax furnace, the coverture of molten condition is added to copper liquid surface using spoon when addition, is made
Its surface for being uniformly covered on crystallizer copper liquid, addition in three minutes is primary, the coverture, by mass percentage, by following groups
Part composition: 75% borax, 10% KCl, 15% NaCl.It should be understood that it is well known that when cast, generally in copper water table
The borax of molten condition is added as coverture in face, prevents oxidation and the volatilization of metal, the present invention is by adding above-mentioned coverture
Replace borax, other than playing the role of borax, simultaneously as the coverture density ratio copper water of addition is small, be located at copper water surface,
It reacts with the impurity metallic elements inside that layer of copper water of contact, generating slag can by constantly adsorbing chemical combination slag making
Guarantee the pure of copper water to the greatest extent, make slag cooled and solidified at the top of liquid level, the copper water being cleaned is natural since impurity is reduced
Sedimentation, new copper water supplement, then addition coverture in due course, continue to purify, move in circles.Therefore, the present invention passes through coverture
The specific addition step of ingredient and content setting and coverture, can further function as the effect of removal of impurities, to preferably mention
Rise the quality of entire ingot casting.
Specifically in the present embodiment: in step (3) cast, being tested using horizontal ruler ensures the level of crystallizer,
Crystallizer installation is not horizontal to prevent after thickness increase, leads to problems such as to generate leakage copper when cast.
In addition: it should be added that: the side wall that crystallizer internal cavity corresponds to slab long side is the compensation knot of outwardly convex
Structure, the collocation structure being projected as in the horizontal plane are arc-shaped.It should be understood that because there are cold for inside ingot in casting process
But speed difference, the metal in centre is final solidified, cools down and shrinks, and the size of ingot casting is made to be less than the interior chamber size of crystallizer,
Especially when ingot casting is thicker, thickness direction seems particularly evident, forms macroscopic concave arc.The present invention is by using compensation
Method improves the interior shape of crystallizer, is the compensation of outwardly convex by the sidewall design that crystallizer internal cavity corresponds to slab long side
Structure makes the surface of ingot casting flatten to supplement the concave surface generated after cooling using the copper water for protruding part.It needs further
Illustrate: collocation structure being projected as in the horizontal plane is arc-shaped, on the one hand, the surface for being more advantageous to ingot casting flattens, another
Aspect facilitates crystallizer to process.
Specifically in the present embodiment, for copper ingot of the casting having a size of 300*420mm, this is arc-shaped on its head and the tail line
1/8,3/8,1/2,5/8 and 7/8 position at the distance value away from head and the tail line be respectively 1.7mm, 3.8 mm, 4.2 mm, 3. 8
The matched curve of this 5 discrete point-renderings of mm and 1.7mm.It should be understood that applicant passes through long-term production practices and reason
It is found by analysis, the distance away from head and the tail line at arc-shaped 1/8,3/8,1/2,5/8 and 7/8 position on its head and the tail line
Value is respectively the matched curve of 1.7mm, 3.8 mm, 4.2 mm, 3. 8 mm and 1.7mm this 5 discrete point-renderings, obtained knot
The shape of brilliant device 1 can most be such that final cooling meat amount is compensated, and cast out the wide ingot of flat copper, be conducive to subsequent rolling into
Row.
Need further to remark additionally: the central axes of head piece and the body diagonal of above-mentioned crystallizer coincide, the stream
Mouth is at least a pair, and the projection of the central axes of every convection mouth in the horizontal plane coincides.It should be understood that being directed to big thickness
For ingot casting, copper water outflow arrival edge is slower, cannot cool in time, and the central axes of head piece and above-mentioned knot in the present invention
The body diagonal of brilliant device coincides this design, can solve this technical problem.
(4) sawing
The copper ingot of cast is cut into length required for us, push rod furnace can be put into and heated.It should be understood that by above-mentioned
Content it is found that due to slag at the top of liquid level cooled and solidified, therefore partially being promoted end to end for ingot casting can be fallen by sawing in this stage
The quality of entire ingot casting.
(5) face is milled
Milling face is carried out to ingot casting upper and lower surfaces first, in the discharge port of face milling machine, increases a dry brushing machine, then to ingot casting side
Face carries out dry brush, and the drafts for adjusting wire brush is 1-1.2cm, the black silk of borax is removed, finally with sanding machine to four arc chord angles
It polishes, and to ingot casting side face defects critical regions, is also further polished with sanding machine.It should be understood that the present invention is logical
It crosses and milling face is carried out to upper and lower surfaces, side is not milled without exception, then protected by the dry brush in side and sanding machine as side quality
Barrier improves the performance of enterprises so that maintaining original Double Milling avoids four facing cut bring decrease in yield problems.
Specifically in the present embodiment: in step (5), polishing 1cm being carried out to four arc chord angles with sanding machine, and to ingot casting side
Planar defect critical regions are also further polished 3-3.5cm with sanding machine to side.It should be understood that when cast, crystallizer
Four angles all have certain radian, are easy to produce copper liquid and are locally filled with discontented, cause pit, buildup defect, the present invention passes through
Polishing 1cm is carried out to eliminate this defect to four arc chord angles.Furthermore, it is contemplated that side extends into surface after thick stock rolling, so that
There are surface quality problems in made-up belt edge, and the present invention to side by further polishing when polishing four arc chord angles
3-3.5cm, to prevent the defective effect in the middle part of side to surface quality.
A kind of melting scalping process of copper ingot of the invention, each step is all linked with one another, progressive and each process
The reasonable setting of parameter, it is ensured that qualified copper ingot is provided under the premise of melting yield rate, and reduces casting defect, reduces product
Bring increased costs are restructured and melted down, production efficiency is improved.
Claims (7)
1. a kind of melting scalping process of copper ingot, which is characterized in that its step are as follows:
(1) ingredient, melting
By raw material according to the ingredient standard of product it is weighted after, be added melting furnace in carry out heating fusing, add refining agent, and
It is stirred；
(2) slag, constituent analysis are fished out, stands and comes out of the stove
After fishing out net copper water liquid level lime-ash before coming out of the stove, 2-3min is sufficiently stirred from top to bottom, guarantees that ingredient and temperature are uniform, makes gas
Slag is fished out in evolution again, reduces slag inclusion, and addition charcoal covering is protected, detects chemical component, and ingredient qualification stands 6-10min
Degasification, temperature requirement reach 1050-1080 DEG C and come out of the stove；
(3) cast
Copper water is poured into water mold by flow tube ontology, cast is carried out using dedicated draw-casting machine, casting speed is
17rpm-18rpm, hydraulic pressure are 0.18-0.2 MPa, use coverture to cover copper water during cast；
(4) sawing
The copper ingot of cast is cut into length required for us, push rod furnace can be put into and heated；
(5) face is milled
Milling face is carried out to ingot casting upper and lower surfaces first, in the discharge port of face milling machine, increases a dry brushing machine, then to ingot casting side
Face carries out dry brush, and the drafts for adjusting wire brush is 1-1.2cm, the black silk of borax is removed, finally with sanding machine to four arc chord angles
It polishes, and to ingot casting side face defects critical regions, is also further polished with sanding machine.
2. a kind of melting scalping process of copper ingot according to claim 1, it is characterised in that: refining is added in step (1)
The specific steps of agent are as follows: powdery refining agent is placed in powder spraying pot, the nitrogen using purity not less than 99.99% is powdery essence
Refining agent is slowly blown into inside copper liquid through piping, and impurity removing refining while carries out degasification, wherein and nitrogen pressure is 0.2 ~
0.5MPa, the time of dusting is 40-50min, and refining temperature is maintained at 1050~1060 DEG C；After refining agent is added, increase nitrogen
Atmospheric pressure is to 0.5MPa.
3. a kind of melting scalping process of copper ingot according to claim 1, it is characterised in that: flow tube ontology in step (3)
Head piece tilt down setting, tilt angle is 10-15 °, and the length of flow tube ontology is 280mm.
4. a kind of melting scalping process of copper ingot according to claim 1, it is characterised in that: covering is added in step (3)
The specific steps of agent are as follows: firstly, preparing ratio in quality, melted subsequently into borax furnace, spoon is used when addition
The coverture of molten condition is added to copper liquid surface, it is made to be uniformly covered on the surface of crystallizer copper liquid, is added within three minutes
Once.
5. a kind of melting scalping process of copper ingot according to claim 4, it is characterised in that: in step (3): the covering
Agent is made of following components by mass percentage: 75% borax, 10% KCl, 15% NaCl.
6. a kind of melting scalping process of copper ingot according to claim 1, it is characterised in that: in step (5), use sanding machine
Polishing 1cm is carried out to four arc chord angles, and to ingot casting side face defects critical regions, is also further polished 3- with sanding machine to side
3.5cm。
7. a kind of melting scalping process of copper ingot according to claim 1, it is characterised in that: in step (3) cast, adopt
Being tested with horizontal ruler ensures the level of crystallizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910453931.XA CN110117728A (en) | 2019-05-29 | 2019-05-29 | A kind of melting scalping process of copper ingot |
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| CN201910453931.XA CN110117728A (en) | 2019-05-29 | 2019-05-29 | A kind of melting scalping process of copper ingot |
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Application publication date: 20190813 |