CN110468254A - A kind of method of the vacuum carbon block deoxidation of safety and environmental protection - Google Patents
A kind of method of the vacuum carbon block deoxidation of safety and environmental protection Download PDFInfo
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- CN110468254A CN110468254A CN201910910162.1A CN201910910162A CN110468254A CN 110468254 A CN110468254 A CN 110468254A CN 201910910162 A CN201910910162 A CN 201910910162A CN 110468254 A CN110468254 A CN 110468254A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0025—Adding carbon material
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention belongs to a kind of methods of the vacuum carbon block deoxidation of field of steel metallurgy more particularly to safety and environmental protection, are suitable for vacuum refining process.The present invention collects the waste and old electrode tip of LF furnace in factory, it is processed as to the carbon block of 40~50mm of granularity with broken cutting, fines material bonding briquetting mode.Vacuum pays attention to spraying state in observation vacuum chamber after starting to process, in the case where steel water oxygen has largely situation more than needed, processing weakens to splash in vacuum chamber, and the carbon block calculated is at this moment added, oxygen continuation of largely having more than needed in molten steel is reacted with carbon, is not in that the excessive slag of carbon dust is added and turns over to wrap even to spray quick-fried accident；Processing reaches decarburization terminal and determines oxygen with Determining oxygen probe, completes deoxidation Decarburization Operation with aluminum shot final deoxidizing.The formula that carbon content of molten steel calculates addition carbon block amount is analyzed according to laboratory, can guarantee that the carbon in vacuum decarburization endpoint molten steel reaches the level of ultra-low-carbon steel, while the residual oxygen in molten steel is also controlled in 200PPm left and right horizontal, and aluminum shot deoxidation consumption is controlled to minimum.
Description
Technical field
The invention belongs to a kind of methods of the vacuum carbon block deoxidation of field of steel metallurgy more particularly to safety and environmental protection, are applicable in
In vacuum refining process.
Background technique
Under vacuum condition, decarburization is that the carbon leaned in molten steel and oxygen react and generates CO gas to realize.Balanced reaction
Equation are as follows: [C]+[O]=CO ↑, the partial pressure of CO in gas phase can be reduced by improving vacuum degree, be moved so that balancing to positive reaction direction
It is dynamic, be conducive to deoxidation, under vacuum conditions, carbon is best deoxidier, its deoxidation products is that gas does not pollute molten steel.In reality
Carbon and oxygen in the production of border in molten steel, which exist, to be balanced, and carbon oxygen product determines the relationship of carbon and oxygen in converter.Converter tapping terminates
Start to process that interval time is very short to vacuum, the carbon in molten steel and oxygen it is also following and be balanced and react, cause the carbon of converter
Oxygen product determines that vacuum is arrived at a station the carbon and oxygen content of molten steel.Which results in often occurring to molten steel in vacuum drying oven, carbon is low, oxygen is high
Situation, and converter carbon oxygen product is higher, and the situation that carbon is low, oxygen is high is just more severe.Carbon in molten steel is often not enough to take off oxygen
Complete, most of factories all use oxygen extra in the alloys such as aluminium, silicon removing molten steel, and cost of alloy consumption is big, and generation field trash is more, dirty
Contaminate molten steel.Some Enterprises use carbon dust deoxidation, and it is violent to be easy to appear reaction between carbon and oxygen, and the ladle slag that overflows turns over packet, even spray it is quick-fried, seriously
Threaten safety in production.Using carbon dust is added portionwise on a small quantity, not only additional amount is few but also influences deoxidation speed for some enterprises, determines oxygen mistake
Accidentally it is also easy to carbon Gao Gaigang.Currently, a kind of safe and reliable method there is no to realize that vacuum adds carbon deoxidation, especially vacuum chamber oxygen blast
Stream slag, steel water oxygen have more than needed it is more in the case where realize safely plus carbon deoxidation.
Summary of the invention
The object of the present invention is to provide a kind of method of the vacuum carbon block deoxidation of safety and environmental protection, using discarded graphite electrode,
It is processed as oxygen of having more than needed in the carbon block substitution aluminum shot, ferrosilicon, carbon dust removing steel of granularity certain (40~50mm), according to same wt carbon
The reaction surface area of block is much smaller than carbon dust surface area, slows down the principle of the reaction speed of oxygen in carbon and steel, alleviates and occurs that carbon is added
The excessive slag of powder turns over packet and even sprays quick-fried accident.
Technical scheme is as follows:
A kind of method of the vacuum carbon block deoxidation of safety and environmental protection collects the waste and old electrode tip of LF furnace in factory, it is cut with broken
The mode of cutting is processed as the carbon block of 40~50mm granularity, and carbon dust feed bin will be expected in the carbon block processed；
Molten steel first samples, determines oxygen with Determining oxygen probe in vacuum drying oven, analyzes carbon content of molten steel according to laboratory and counts as the following formula
It calculates and carbon block amount is added:
Carbon block additional amount C={ (O+K-C1*Q-M)/Q } * T*10
O, which is represented to molten steel Determining oxygen probe in vacuum drying oven, determines oxygen value；
K represents vacuum chamber and returns oxygen；
C1 is represented to the carbon content in vacuum drying oven in molten steel steel；
Q represents carbon oxygen consumption coefficient 1.333；
M represents decarburization latter stage residual oxygen；
T represents molten steel amount；
Vacuum pays attention to spraying state in observation vacuum chamber after starting to process, in the case where steel water oxygen has largely situation more than needed, place
Reason weakens to splash in vacuum chamber, and the carbon block calculated is at this moment added, and oxygen continuation of largely having more than needed in molten steel is reacted with carbon, will not go out
The excessive slag of carbon dust is now added and turns over to wrap and even sprays quick-fried accident；Processing reaches decarburization terminal and determines oxygen with Determining oxygen probe, with aluminum shot final deoxidizing
Complete deoxidation Decarburization Operation.
The method of the vacuum carbon block deoxidation of the safety and environmental protection, it is 200~600PPm that vacuum chamber, which returns oxygen,.
The method of the vacuum carbon block deoxidation of the safety and environmental protection, in the case where steel water oxygen has largely situation more than needed, oxygen content
For 800~1000PPm；It is vacuum-treated 2~splash weakens in vacuum chamber after five minutes, the carbon block calculated is at this moment added；Carbon block adds
After entering, 10~20 minutes arrival decarburization terminal Determining oxygen probes of processing determine oxygen, and decarburization latter stage residual oxygen is 150~250PPm, take off
Carbon powder phase residual carbon reaches 20PPm or less.
The method of the vacuum carbon block deoxidation of the safety and environmental protection, for the too small carbon block of granularity, using graphite adhesive
It is bonded and is pressed into granularity 40~50mm standard particle size carbon block and reuses.
Design philosophy of the invention is:
The method that the present invention realizes the vacuum carbon block deoxidation of safety and environmental protection, determines carbon block grain according to vacuum alloy maximum particle size
Degree searches high-order carbon dust feed bin barrier minimum aperture size, and it is required that barrier minimum aperture size is less than vacuum alloy maximum particle size
Carbon dust feed bin barrier is replaced, makes its minimum aperture size slightly larger than alloy vacuum alloy maximum particle size.Barrier minimum aperture size
Do not have to replacement carbon dust feed bin barrier greater than vacuum alloy maximum particle size, ensures that carbon block is normally added in this way.The grain of carbon dust
Degree is usually 8mm or so, and carbon block granularity of the invention is generally the carbon block of 40~50mm.Method of the invention is easy to operate, drop
Cost effectiveness is obvious, is suitble to promote and apply in other vacuum lines.
The invention has the advantages and beneficial effects that:
1) present invention is much smaller than carbon dust surface area principle using the reaction surface area of same weight carbon block, slows down in carbon and steel
The reaction speed of oxygen, alleviate carbon oxygen vigorous reaction cause overflow slag turn over packet even spray quick-fried damage sequence, it is extremely simple practical.
2) present invention uses carbon substituted for silicon aluminium deoxidation, averagely saves aluminum shot 0.42Kg/ tons of steel.
3) present invention uses carbon substituted for silicon aluminium deoxidation, and deoxidation products is CO gas, is not remained in steel, will not be produced
Raw Al2O3、SiO2Equal field trashes, improve Molten Steel Cleanliness.
4) of the invention plus carbon block amount has calculation formula, it is ensured that the carbon control of ultra-low-carbon steel, moreover it is possible to utmostly utilize
Carbon deoxidation.
5) present invention is that ladle refining furnace waste and old in factory (i.e. LF furnace, LADLE FURNACE) electrode cutting is processed as grain
Certain carbon block is spent, is on the one hand reduced cost consumption, two aspects are waste utilizations, preserve the ecological environment, there is good society effect
Benefit.
Specific embodiment
In the specific implementation process, its operation step of the method for the vacuum carbon block deoxidation of a kind of safety and environmental protection provided by the invention
It is rapid as follows:
The waste and old electrode tip of LF furnace in factory is collected, processing factory is sent to, it is processed as carbon block with crusher crumbling method, to broken
Broken carbon block is screened, and that chooses 40~50mm of granularity will expect carbon dust feed bin in the carbon block processed.It is too small for granularity
Carbon block, bonded using graphite adhesive (such as: resin glue) and be pressed into granularity 40~50mm standard particle size carbon block and reuse.
Molten steel first samples, determines oxygen with Determining oxygen probe in vacuum chamber, is calculated as follows and is added according to laboratory analysis carbon content
Enter carbon block amount:
Carbon block additional amount C={ (O+K-C1*Q-M)/Q } * T*10
O, which is represented to molten steel Determining oxygen probe in vacuum chamber, determines oxygen value；
K represents vacuum chamber and returns oxygen, generally 200~600PPm；
C1 is represented to the carbon content in vacuum chamber in molten steel steel；
Q represents carbon oxygen consumption coefficient 1.333；
M represents decarburization latter stage residual oxygen and is generally 200PPm or so；
T represents molten steel amount.
Vacuum pays attention to spraying state in observation vacuum chamber after starting to process, generally have largely situation more than needed in steel water oxygen
Under, processing weakens to splash in vacuum chamber, and the carbon block calculated is at this moment added, and oxygen continuation of largely having more than needed in molten steel is reacted with carbon,
It is not in that the excessive slag of carbon dust is added and turns over to wrap even to spray quick-fried accident.Processing reaches decarburization terminal Determining oxygen probe and determines oxygen, decarburization end
Phase residual oxygen is generally 200PPm or so, and carbon also reaches 20PPm hereinafter, completing deoxidation Decarburization Operation with a small amount of aluminum shot final deoxidizing.
In order to better explain the present invention, below in conjunction with the specific embodiment main contents that the present invention is furture elucidated, but
The contents of the present invention are not limited solely to following embodiment.
Embodiment:
In the present embodiment, 80 tons of vacuum drying ovens of certain steel mill, main smelting ultralow-carbon variety steel, LF furnace has a large amount of waste and old electricity in factory
Cartridge will be handled.The waste and old electrode tip of LF furnace in factory is collected, processing factory is sent to, it is processed as carbon block with crusher crumbling method,
Broken carbon block is screened, that chooses 40~50mm of granularity will expect carbon dust feed bin in the carbon block processed.For granularity
Too small carbon block is bonded using a small amount of graphite adhesive (resin glue) is added, and is pressed into 40~50mm of granularity mark with cuber
Quasi- granularity carbon block reuses.
Carbon content of molten steel 0.023wt% in vacuum drying oven, [O] content 821PPm, the vacuum chamber stream quantity of slag is big, estimates vacuum chamber
Return oxygen value K=400PPm, 78 tons of molten steel amount.It calculates and adds carbon block amount are as follows:
Carbon block additional amount C={ (O+K-C1*Q-M)/Q } * T*10
={ (0.0821+0.04-0.023*1.33-0.02)/1.33 } * 78*10
=41.9kg ≈ 42kg
Vacuum starts to process, and starts light tupe, controls vacuum degree in 8KPa.Start automatic material weighing system, claims 42kg
Carbon block is put into loading hopper.Spraying state in vacuum chamber is observed by camera, splash very little in vacuum chamber after processing 2 minutes half,
At this moment charging valve is opened, the carbon block 42kg calculated is added in starting loading hopper electricity vibration (electric and magnetic oscillation), and molten steel starts to restore to seethe
Splash, but splash is not especially severe, big tank molten steel face is slightly stirred.Handle 14 minutes arrival decarburization terminal Determining oxygen probes
Determine oxygen value 230PPm, sampling analysis carbon is 17PPm, completes deoxidation Decarburization Operation.The aluminum shot that granularity is 0.8~1.5mm is added, mends
Aluminium alloying completes steel-making.
Embodiment the result shows that, the present invention collects the waste and old electrode tip of LF furnace in factory, it is bonded with broken cutting, fines material
Briquetting mode is processed as the carbon block (graphite adhesive resin glue) of 40~50mm of granularity.Compared with the carbon dust of other factories 8mm, equally
The reaction between carbon and oxygen surface area of weight carbon block is much smaller than carbon dust surface area, can slow down the reaction speed of oxygen in carbon and steel.Meanwhile root
The formula that carbon block amount is added is calculated according to laboratory analysis carbon content of molten steel, can guarantee that the carbon in vacuum decarburization endpoint molten steel reaches
The level of ultra-low-carbon steel, while the residual oxygen in molten steel is also controlled in 200PPm left and right horizontal, and aluminum shot deoxidation consumption control is arrived
It is minimum.
Other unspecified parts are the prior art.Although above-described embodiment is made that the present invention and retouches in detail
State, but it is only a part of the embodiment of the present invention, rather than whole embodiments, people can also according to the present embodiment without
Other embodiments are obtained under the premise of creativeness, these embodiments belong to the scope of the present invention.
Claims (4)
1. a kind of method of the vacuum carbon block deoxidation of safety and environmental protection, which is characterized in that the waste and old electrode tip of LF furnace in factory is collected, by it
It is processed as the carbon block of 40~50mm granularity with broken cutting mode, carbon dust feed bin will be expected in the carbon block processed；
Molten steel first samples, determines oxygen with Determining oxygen probe in vacuum drying oven, is calculated as follows and is added according to laboratory analysis carbon content of molten steel
Enter carbon block amount:
Carbon block additional amount C={ (O+K-C1*Q-M)/Q } * T*10
O, which is represented to molten steel Determining oxygen probe in vacuum drying oven, determines oxygen value；
K represents vacuum chamber and returns oxygen；
C1 is represented to the carbon content in vacuum drying oven in molten steel steel；
Q represents carbon oxygen consumption coefficient 1.333；
M represents decarburization latter stage residual oxygen；
T represents molten steel amount；
Vacuum pays attention to spraying state in observation vacuum chamber after starting to process, in the case where steel water oxygen has largely situation more than needed, processing is extremely
Splash weakens in vacuum chamber, and the carbon block calculated is at this moment added, and it is not in add that oxygen continuation of largely having more than needed in molten steel is reacted with carbon
Enter carbon dust overflow slag turn over packet even spray quick-fried accident；Processing reaches decarburization terminal and determines oxygen with Determining oxygen probe, is completed with aluminum shot final deoxidizing
Deoxidation Decarburization Operation.
2. the method for the vacuum carbon block deoxidation of safety and environmental protection described according to claim 1, which is characterized in that vacuum chamber returns oxygen
For 200~600PPm.
3. the method for the vacuum carbon block deoxidation of safety and environmental protection described according to claim 1, which is characterized in that in steel water oxygen
Have in largely situation more than needed, oxygen content is 800~1000PPm；It is vacuum-treated 2~splash weakens in vacuum chamber after five minutes, at this moment
The carbon block calculated is added；After carbon block is added, 10~20 minutes arrival decarburization terminal Determining oxygen probes of processing determine oxygen, decarburization latter stage
Residual oxygen is 150~250PPm, and decarburization latter stage residual carbon reaches 20PPm or less.
4. the method for the vacuum carbon block deoxidation of safety and environmental protection described according to claim 1, which is characterized in that too for granularity
Small carbon block is bonded using graphite adhesive and is pressed into granularity 40~50mm standard particle size carbon block and reuses.
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| CN201910910162.1A CN110468254A (en) | 2019-09-25 | 2019-09-25 | A kind of method of the vacuum carbon block deoxidation of safety and environmental protection |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002363635A (en) * | 2001-06-07 | 2002-12-18 | Nkk Corp | Method for determining decarburization terminating point in vacuum degassing apparatus |
| KR20040059575A (en) * | 2002-12-27 | 2004-07-06 | 주식회사 포스코 | Method of refining molten steel to manufacture semi-low carbon steel |
| CN103343182A (en) * | 2013-07-12 | 2013-10-09 | 鞍钢股份有限公司 | Medium carbon steel deoxidation method |
| CN103642970A (en) * | 2013-12-09 | 2014-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting method of low-carbon aluminum killed steel |
| CN106191376A (en) * | 2016-08-24 | 2016-12-07 | 武汉钢铁股份有限公司 | Ultra-low carbon aluminum killed steel vacuum adds carbon pre-deoxidizing technology |
-
2019
- 2019-09-25 CN CN201910910162.1A patent/CN110468254A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002363635A (en) * | 2001-06-07 | 2002-12-18 | Nkk Corp | Method for determining decarburization terminating point in vacuum degassing apparatus |
| KR20040059575A (en) * | 2002-12-27 | 2004-07-06 | 주식회사 포스코 | Method of refining molten steel to manufacture semi-low carbon steel |
| CN103343182A (en) * | 2013-07-12 | 2013-10-09 | 鞍钢股份有限公司 | Medium carbon steel deoxidation method |
| CN103642970A (en) * | 2013-12-09 | 2014-03-19 | 攀钢集团攀枝花钢铁研究院有限公司 | Smelting method of low-carbon aluminum killed steel |
| CN106191376A (en) * | 2016-08-24 | 2016-12-07 | 武汉钢铁股份有限公司 | Ultra-low carbon aluminum killed steel vacuum adds carbon pre-deoxidizing technology |
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Application publication date: 20191119 |
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