CN105543448A - Method for improving yield of antimony element in RH vacuum refining - Google Patents
Method for improving yield of antimony element in RH vacuum refining Download PDFInfo
- Publication number
- CN105543448A CN105543448A CN201510991236.0A CN201510991236A CN105543448A CN 105543448 A CN105543448 A CN 105543448A CN 201510991236 A CN201510991236 A CN 201510991236A CN 105543448 A CN105543448 A CN 105543448A
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- Prior art keywords
- vacuum
- antimony
- molten steel
- vacuum chamber
- recovery rate
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Links
- 238000000034 method Methods 0.000 title claims abstract description 34
- FAWGZAFXDJGWBB-UHFFFAOYSA-N antimony(3+) Chemical compound [Sb+3] FAWGZAFXDJGWBB-UHFFFAOYSA-N 0.000 title claims abstract description 14
- 238000007670 refining Methods 0.000 title claims description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 39
- 239000010959 steel Substances 0.000 claims abstract description 39
- 229910052787 antimony Inorganic materials 0.000 claims abstract description 25
- WATWJIUSRGPENY-UHFFFAOYSA-N antimony atom Chemical compound [Sb] WATWJIUSRGPENY-UHFFFAOYSA-N 0.000 claims abstract description 20
- 238000011084 recovery Methods 0.000 claims description 17
- 238000005275 alloying Methods 0.000 claims description 14
- 238000005261 decarburization Methods 0.000 claims description 6
- 238000006477 desulfuration reaction Methods 0.000 claims description 4
- 230000023556 desulfurization Effects 0.000 claims description 4
- 238000002309 gasification Methods 0.000 abstract description 7
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000002349 favourable effect Effects 0.000 abstract description 2
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 229910052786 argon Inorganic materials 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 229910000976 Electrical steel Inorganic materials 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000003672 processing method Methods 0.000 description 3
- 238000009834 vaporization Methods 0.000 description 3
- 230000008016 vaporization Effects 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- 238000003763 carbonization Methods 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 230000001351 cycling effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 229910052748 manganese Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 241001062472 Stokellia anisodon Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000005304 joining Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
- Heat Treatment Of Sheet Steel (AREA)
Abstract
The invention relates to a method for improving the yield of antimony element refined in RH vacuum, which is characterized in that antimony ingots are independently added from a vacuum chamber within 10min before RH vacuum breaking, and the exposure time of the antimony ingots under the conditions of low pressure and high temperature is reduced as much as possible by controlling the granularity of the antimony ingots, the pressure of the vacuum chamber, the flow rate of the antimony ingots, the temperature of molten steel and other factors, thereby creating favorable conditions for inhibiting the gasification of the antimony ingots, obviously improving the yield of the antimony element and reducing the production cost.
Description
Art
The present invention relates to molten steel furnace external refining field, particularly a kind of method improving RH vacuum refinement antimony element recovery rate.
Background technology
Antimony (Sb), as a kind of thick atom surface active element, adds to after in steel, and material can be made to obtain larger grain-size, higher hardness, and promotes the formation to the favourable texture of magnetism of material energy.When the Sb content in steel reaches 0.05%, the texture component being conducive to magnetism of material energy reaches maximum, and the magnetic induction density of steel is significantly improved, and iron loss obviously reduces.
In the smelting process of steel, particularly smelt in the process of high grade non-oriented silicon steel, in order to improve and the magnetic property stablizing silicon steel need add Sb element.At present in RH refining process, Sb element is just together added in molten steel with other alloying elements simply in the process of alloying, but production practice show, there is following limiting factor, make the recovery rate of antimony element in the process of RH vacuum refinement be difficult to further raising.
(1) there is the Sb that burning generates low melting point in antimony slab contact high-temperature molten steel
2o
3evaporate in air.
(2) according to the analysis of the physico-chemical property to Sb: under condition of normal pressure, the temperature of fusion of Sb is 630 DEG C, gasification temperature is 1590 DEG C, under RH vacuum chamber condition, the gasification temperature of Sb reduces along with the reduction of vacuum chamber pressure, and the temperature range of RH treating processes molten steel is 1575 ~ 1595 DEG C, far above the gasification temperature of Sb, Sb easily gasifies volatilization.
(3) in the process of RH vacuum refinement, melt the Sb that enters in molten steel when being circulated to vacuum chamber, because the Sb gasification temperature that (is about 1 ~ 1.5mbar) under lower pressure is far below steel treatment temperature, part Sb volatilization enters cleaning shaft.
(4) the adding of other alloying elements, particularly the oxidation heat liberation (Al, Si, Mn) of deoxygenated alloy makes the temperature of molten steel rise, and exacerbates the gasification of Sb element.In addition, due to alloying element while add, make Sb long for the cycling time in RH device, amount of vaporization showed increased.
In prior art, antimony slab is when contacting the oxidation heat liberation of high-temperature molten steel or lower pressure and deoxygenated alloy, and Sb easily volatilizees, and Sb element recovery rate is lower.
Summary of the invention
The object of the present invention is to provide a kind of method improving RH vacuum refinement antimony element recovery rate, solve above-mentioned problems of the prior art with this, the RH vacuum refining process target realize significantly improving Sb element recovery rate, reducing smelting cost.
For solving the problems of the technologies described above, the present invention adopts following technical scheme:
Improve a method for RH vacuum refinement antimony element recovery rate, key step comprises: ladle is risen to hydraulic top raise-position, vacuumize, be blown into lift gas, realize Circulating Flow of Molten Steel; The operation of RH vacuum decarburization; Alloying and desulfurization process; Broken unprecedented at RH, separately antimony slab is added from vacuum chamber; Open air valve broken empty, close lift gas winding-up; Thermometric samples, the qualified rear stopping process of molten steel component.
Further, in the method for described raising RH vacuum refinement antimony element recovery rate, the granularity of antimony slab is more than 10mm, and adding opportunity is within RH breaks unprecedented 10 minutes.
Further, in the method for described raising RH vacuum refinement antimony element recovery rate, after antimony slab is added molten steel from vacuum chamber, molten steel temperature controls below 1590 DEG C, the lifting airshed of RH equipment for vacuum refining is 8-12NL/ (min.t), and RH equipment for vacuum refining vacuum chamber pressure is more than 100mbar.
Compared with prior art, the present invention at least has following beneficial effect:
(1) by unprecedentedly individually antimony slab being added by vacuum chamber RH is broken, the joining day of antimony slab being postponed, decreasing the cycling time of antimony element in RH refining is equipped; By controlling antimony slab granularity, antimony slab is added the vacuum chamber pressure after molten steel from vacuum chamber, the factor such as airshed and molten steel temperature that promotes reduce antimony slab low pressure and hot conditions gasification may, significantly reduce the amount of vaporization of antimony slab in RH vacuum refining process.
(2) by improving the recovery rate of Sb element significantly, during minimizing RH vacuum refinement, the amount of vaporization of Sb element, significantly reduces production cost, achieves considerable economic benefit.Meanwhile, the pollution of Sb element to environment is reduced apparently.
Embodiment
Now to choose steel grade for silicon steel W600, the ladle specification of use is 200t, and Metal Weight is 175 ~ 185t, adopts present invention process vacuum-treat to be example, is further described this invention.
Embodiment
The mass percent of RH vacuum cycle molten steel composition before treatment is: C0.021% ~ 0.061%; Si0.0006% ~ 0.0022%; Mn0.05% ~ 0.082%; P0.008% ~ 0.013%; S0.0015% ~ 0.0021%; Al0.0005% ~ 0.0015%; Sb0.0005% ~ 0.0010%; All the other are Fe and inevitable impurity.
The step successively of RH vacuum refining process processing method of the present invention is:
(1) ladle is risen to hydraulic top raise-position, utilize hydraulic efficiency plant by ladle jack-up, soaking tub is made to be immersed in molten steel, to the vacuum chamber of RH vacuum circulation refining device, vacuum tightness is evacuated to below working vacuum degree, sucked by molten steel in the vacuum chamber of RH vacuum circulation refining, argon gas is blown into lift gas, molten steel to be achieved circulating in RH a refining unit by promoting gas blowout pipe by argon gas sending spparatus in soaking tub.
(2) carry out carbonization treatment under vacuum conditions, decarburization time is 15 ~ 20min, and ensures vacuum tightness needed for decarburization;
(3) add the Si of 3500 ~ 4000Kg according to the requirement of steel grades, the Al of the Mn of 660 ~ 890Kg, 650 ~ 860Kg and other a small amount of trace alloying element, alloying, carries out desulfurization process;
(4) within RH breaks unprecedented 10 minutes, add from vacuum chamber Sb90 ~ 120Kg that granularity is 30 ~ 60mm, molten steel temperature controls between 1575 ~ 1585 DEG C, and the lifting airshed of RH equipment for vacuum refining is 100-120Nm
3/ h, RH equipment for vacuum refining vacuum chamber pressure is between 200 ~ 500mbar.
(5) open vacuum valve broken empty, close the winding-up of lift gas;
(6) thermometric sampling, analyze molten steel component, the mass percent of molten steel component is:
C:0.0015% ~ 0.0036%; Si1.29% ~ 1.54%; Mn0.40% ~ 0.49%; P0.012% ~ 0.015%; S0.0020% ~ 0.0031%; Al0.28% ~ 0.32%; All the other are alloying element and some inevitable impurity of Fe and some trace.
At the end of RH refining process, to be 0.045% ~ 0.065%, Sb recovery rate be Sb constituent content: 68.7% ~ 97.2%, average recovery rate 86.72%.
Comparative example
The mass percent of RH vacuum cycle molten steel composition before treatment is: C0.025% ~ 0.058%; Si0.0009% ~ 0.0025%; Mn0.053% ~ 0.091%; P0.009% ~ 0.015%; S0.0018% ~ 0.0027%; Al0.0006% ~ 0.0017%; Sb0.0006% ~ 0.0009%; All the other are Fe and inevitable impurity.
Former technique RH vacuum refining process processing method successively step is:
(1) ladle is risen to hydraulic top raise-position, utilize hydraulic efficiency plant by ladle jack-up, soaking tub is made to be immersed in molten steel, to the vacuum chamber of RH vacuum circulation refining device, vacuum tightness is evacuated to below working vacuum degree, sucked by molten steel in the vacuum chamber of RH vacuum circulation refining, argon gas is blown into lift gas, molten steel to be achieved circulating in RH a refining unit by promoting gas blowout pipe by argon gas sending spparatus in soaking tub.
(2) carry out carbonization treatment under vacuum conditions, decarburization time is 15 ~ 20min, and ensures vacuum tightness needed for decarburization;
(3) add the Si of 3420 ~ 3980Kg according to the requirement of steel grades, the Al of the Mn of 755 ~ 920Kg, 650 ~ 930Kg and other a small amount of trace alloying element, alloying, carries out desulfurization process;
(4) when RH deoxidation alloying, the alloy such as Sb and Al, Si, Mn adds together, Sb168 ~ 235Kg that granularity is 30 ~ 60mm is added from vacuum chamber, molten steel temperature controls between 1570 ~ 1585 DEG C, deoxidation alloying terminates, temperature rises to 1585-1597 DEG C, and the lifting airshed of RH equipment for vacuum refining is 140-160Nm
3/ h, RH equipment for vacuum refining vacuum chamber pressure is below 2mbar;
(5) open vacuum valve broken empty, close the winding-up of lift gas;
(6) thermometric sampling, analyze molten steel component, the mass percent of molten steel component is:
C:0.0018% ~ 0.0041%; Si1.45% ~ 1.57%; Mn0.45% ~ 0.53%; P0.0096% ~ 0.0185%; S0.0015% ~ 0.0040%; Al0.26% ~ 0.31%; All the other are alloying element and some inevitable impurity of Fe and some trace.
At the end of RH refining process, Sb constituent content is 0.042% ~ 0.058%, Sb recovery rate average 44.4%.
Compared with original processing method, novel process recovery rate increases substantially, and achievement is remarkable.
What finally illustrate is, above preferred embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although by above preferred embodiment to invention has been detailed description, but those skilled in the art are to be understood that, various change can be made to it in the form and details, and not depart from claims of the present invention limited range.
Claims (3)
1. improve a method for RH vacuum refinement antimony element recovery rate, it is characterized in that: the key step of the method comprises: ladle is risen to hydraulic top raise-position, vacuumize, be blown into lift gas, realize ladle and circulate; The operation of RH vacuum decarburization; Alloying and desulfurization process; Broken unprecedented at RH, separately antimony slab is added from vacuum chamber; Open air valve broken empty, close lift gas winding-up; Thermometric samples, the qualified rear stopping process of molten steel component.
2. the method for raising RH vacuum refinement antimony element recovery rate according to claim 1, it is characterized in that: the granularity of described antimony slab is more than 10mm, adding opportunity is within RH breaks unprecedented 10 minutes.
3. the method for raising RH vacuum refinement antimony element recovery rate according to claim 1, it is characterized in that: after antimony slab is added molten steel from vacuum chamber, molten steel temperature controls below 1590 DEG C, the lifting airshed of RH equipment for vacuum refining is 8-12NL/ (min.t), and RH equipment for vacuum refining vacuum chamber pressure is more than 100mbar.
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| CN201510991236.0A CN105543448B (en) | 2015-12-25 | 2015-12-25 | Method for improving yield of antimony element in RH vacuum refining |
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| CN201510991236.0A CN105543448B (en) | 2015-12-25 | 2015-12-25 | Method for improving yield of antimony element in RH vacuum refining |
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| CN105543448B CN105543448B (en) | 2017-12-29 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106893798A (en) * | 2017-04-02 | 2017-06-27 | 首钢总公司 | A kind of corrosion-resisting steel adds the smelting process of antimony |
| CN112458302A (en) * | 2020-10-29 | 2021-03-09 | 任志峰 | RH vacuum refining method capable of improving antimony element yield |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102212652A (en) * | 2011-05-17 | 2011-10-12 | 武汉钢铁(集团)公司 | Rapid degassing method of vacuum induction furnace |
| CN102409137A (en) * | 2011-10-25 | 2012-04-11 | 钢铁研究总院 | Method for controlling content of nitrogen in oriented silicon steel |
| CN103966402A (en) * | 2014-05-14 | 2014-08-06 | 东北大学 | RH (Relative Humidity) vacuum refining system and desulfuration method for molten steel desulfuration |
-
2015
- 2015-12-25 CN CN201510991236.0A patent/CN105543448B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102212652A (en) * | 2011-05-17 | 2011-10-12 | 武汉钢铁(集团)公司 | Rapid degassing method of vacuum induction furnace |
| CN102409137A (en) * | 2011-10-25 | 2012-04-11 | 钢铁研究总院 | Method for controlling content of nitrogen in oriented silicon steel |
| CN103966402A (en) * | 2014-05-14 | 2014-08-06 | 东北大学 | RH (Relative Humidity) vacuum refining system and desulfuration method for molten steel desulfuration |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106893798A (en) * | 2017-04-02 | 2017-06-27 | 首钢总公司 | A kind of corrosion-resisting steel adds the smelting process of antimony |
| CN112458302A (en) * | 2020-10-29 | 2021-03-09 | 任志峰 | RH vacuum refining method capable of improving antimony element yield |
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| Publication number | Publication date |
|---|---|
| CN105543448B (en) | 2017-12-29 |
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