CN106282475A - A kind of method efficiently utilizing converter dust-removing ash - Google Patents
A kind of method efficiently utilizing converter dust-removing ash Download PDFInfo
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- CN106282475A CN106282475A CN201610827453.0A CN201610827453A CN106282475A CN 106282475 A CN106282475 A CN 106282475A CN 201610827453 A CN201610827453 A CN 201610827453A CN 106282475 A CN106282475 A CN 106282475A
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- Prior art keywords
- dedusting ash
- ash
- dedusting
- steel
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Classifications
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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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
-
- 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
Abstract
A kind of method efficiently utilizing converter dust-removing ash, belongs to converter steel making method technical field, for efficiently recycling dedusting ash.Its technical scheme is: dedusting ash adds with chute during vanadium extraction goes out half steel, when vanadium extraction goes out half steel to 1/5, open final dusting valve, swivel chute, add dedusting ash, 1 time or 2 times addition can be divided, after dedusting ash adds, front and back walk bag, promote dedusting ash fusing, dedusting valve recovers normal, goes out after half steel terminates, prepares to pneumatic steelmaking iron making.The dedusting ash all standing of the present invention, at half steel liquid level, serves the effect of suppression soot emissions；Dedusting ash forms slag after melting in half ladle, improves a semi-steel making slag difficult problem；Solve dedusting ash and directly return with steel scrap that converter when eating is missing of ignition and electric field venting of dust explosion problem.The present invention is pioneering in pneumatic steelmaking, solves the problem that the dedusting ash not being solved for a long time can effectively utilize, and has that flow process is short, recovery rate of iron is high, the advantage of low cost.
Description
Technical field
The present invention relates to a kind of method in STEELMAKING PRODUCTION, dedusting ash efficiently recycled, belong to pneumatic steelmaking side
Law technology field.
Background technology
Converter dust-removing ash belongs to the solid waste produced in steelmaking process, containing FeO, CaO, Fe2O3、SiO2, etc. become
Point, the especially dedusting ash of semi-steel making, iron content, calcium oxide are high, and ton steel produces about 30kg, is secondary iron-containing resource, FeO-
CaO base has higher value to steel-making.Dedusting ash is because its temperature is high, the little feature of granule, and its comprehensive utilization is more tired
Difficulty, utilizing of especially converter fine ash is particularly difficult.At present, Ge great steel mill is a lot of to the mode of the recycling of dedusting ash,
Majority is dedusting ash to return sintering carry out dispensing, but returns the shortcoming that sintering exists long flow path, beneficial element recovery rate is low；Also
There is Some Enterprises with dedusting ash as major ingredient, add recycling after certain material is processed according to purposes in different ratios,
Solve long flow path and the low shortcoming of recovery rate, but it is high to there is processing cost, does not utilize low-cost production；Also has part dedusting ash
Directly Iron concentrate is replaced to apply in extra furnace dephosphorization process, this kind of way of recycling low cost, but yield and the flux matched difficulty of generation
Degree is big, easily causes dedusting ash and overstocks, is unfavorable for Production Cohesion；Also having part dedusting ash directly to add with steel scrap, flow process is short, cost
Low, but cause converter to open piping and druming fire difficulty, and Primary period part dedusting ash is siphoned away by blower fan, makes dustiness in early stage flue dust increase
Add, bring certain pressure to electric field dedusting.All there is cost pressure in various degree, recovery in these recycling modes at present
Efficiency, STEELMAKING PRODUCTION problem etc., always perplex a difficult problem for iron and steel enterprise, it would be highly desirable to solve.
Summary of the invention
The technical problem to be solved is to provide a kind of method efficiently utilizing converter dust-removing ash, this method
Flow process is short, recovery rate of iron is high, low cost, not only can reduce cost, improve dedusting ash recovery rate, moreover it is possible to effectively alleviate life
Produce pressure, keep cleaning to produce.
The technical scheme solving above-mentioned technical problem is:
A kind of method efficiently utilizing converter dust-removing ash, its employing following steps is carried out:
A. controlling half steel temperature and be more than 1250 DEG C, the upper limit meets vanadium extraction ceiling temperature requirement 1420 DEG C；
B. according to half steel temperature dedusting ash consumption 4-10kg/t；
C. start half steel, when tapping is to 1/5, fully open final dusting valve, it is initially added into dedusting ash with steel stream；
D. after dedusting ash adds, front and back walk bag, increase molten steel wriggling in bag, promote that dedusting ash fusing forms foamed slag；
When e. tapping to 4/5, dedusting valve recovers normal；
F., after tapping terminates, prepare to steelmaking converter iron making；
G. after steelmaking converter iron making terminates, lower rifle blows, and adds bottom ash 4-8kg/t, it is not necessary to adds other and changes slag material；
After the most slag melting, operation recovery is normal.
The above-mentioned method efficiently utilizing converter dust-removing ash, adds dedusting ash and can divide 1-2 addition, every time in described step c
Addition is less than 5kg/t, after for the first time adding dedusting ash, front and back walks bag, to be melted after, second time adds residue dedusting ash,
The most front and back walk bag.
The invention has the beneficial effects as follows:
1., after the method application of the present invention, dedusting ash can all reclaim, and ferrum element conversion ratio is up to more than 90%, the most sharp
With FeO, CaO, SiO in dedusting ash2Etc. multicomponent slag system, impact with steel stream after fusing in half ladle and walk bag kinetic energy, energy
Enough slough part phosphorus, reduce converter and enter stove phosphorus content.This slag system belongs to FeO-CaO base slag, has uniform temperature, basicity, many
Constituent element, may advantageously facilitate converter semi-steel making rapid slagging, changes the slag time and reduces by more than 30 seconds, improves semi-steel making without changing slag thing
During material, a converter slag difficult problem.
2., in the whole application process of the method for the present invention, solving dedusting ash, to add fashionable converter with steel scrap missing of ignition existing
As, it is to avoid add electric field venting of dust explosion during dedusting ash, make to bessemerize early stage dust contained flue gas concentration and reduce 10mg/Nm3Above, and
Effectively reduce electric field load.
3., after the method application of the present invention, dedusting ash is not dispatched from the factory to utilization from unloading ash, and flow process is greatly shortened, and saves fortune
Defeated expense.
The present invention is initiating in pneumatic steelmaking, makes whole dedusting ash obtain effective utilization, solves and the most obtains
The problem that can effectively utilize to the dedusting ash thoroughly solved, this method has that flow process is short, recovery rate of iron is high, low cost excellent
Point, not only can reduce cost, improve dedusting ash recovery rate, moreover it is possible to effectively alleviate production pressure, keeps cleaning to produce, is one
Plant the efficient Land use systems of new dedusting ash, have fabulous popularizing value.
Detailed description of the invention
The present invention is the comprehensive utilization of the full element to dedusting ash.Mainly by the feature that half steel dedusting ash granule is little,
Vanadium extraction operation adds from chute during going out half steel, melts rapidly under the percussion of steel stream in half ladle, and formation has
The slag of certain basicity, covers at half ladle liquid level, plays the effect with air insulated, it is to avoid half steel during half ladle running
Interior carbon and air contact react formation soot emissions in air, the outer row of suppression particulate matter.
In the full element of the present invention comprehensively utilizes, the slag formed after the fusing of the constituent element such as iron content, calcium, silicon, it is possible to slough
Part phosphorus, the feature such as high alkalinity, multicomponent, higher slag temperature promotes the condition that semi-steel making is slag melting just, solves
In the case of half steel is without changing slag material, a half tempered slag difficult problem, reach the purpose of semi-steel making Fast Slag Melting, improve dedusting
The comprehensive utilization of ash element, and make fume amount concentration in Primary period flue gas be effectively controlled, reduce electric field load.
The method efficiently utilizing converter dust-removing ash of the present invention uses following steps to carry out:
A. controlling half steel temperature and be more than 1250 DEG C, the upper limit meets vanadium extraction ceiling temperature requirement 1420 DEG C.
B. according to half steel temperature dedusting ash consumption 4-10kg/t.
C. start half steel, when tapping is to 1/5, fully open final dusting valve, it is initially added into dedusting ash with steel stream, removes
Dirt ash can divide 1-2 addition, and each addition is less than 5kg/t.
D. after dedusting ash adds, front and back walk bag, increase molten steel wriggling in bag, promote that dedusting ash fusing forms foam
Slag.
When e. tapping to 4/5, dedusting valve recovers normal.
F., after tapping terminates, prepare to steelmaking converter iron making.
G. after steelmaking converter iron making terminates, lower rifle blows, and adds bottom ash 4-8kg/t, it is not necessary to adds other and changes slag material.
After the most slag melting, operation recovery is normal.
The method of the present invention is widely used, can be untouchable with Calx face, iron scale, slag etc. granule I recycling
Material is used together, and effect becomes apparent from.
The present invention can extend to apply in fish torpedo ladle molten iron discharging process.
The specific embodiment of the present invention is as follows:
Embodiment 1:
Smelting heat 1: this heat half steel temperature 1280 DEG C, half steel phosphorus content 0.136%.Tapping is shaken dedusting ash 4.3kg/t before starting
Start tapping, when tapping is to 1/5, fully open dedusting valve, add dedusting ash with steel stream, after dedusting ash adds, front and back walk bag 2
Secondary, dedusting ash all melts formation foamed slag and covers half ladle liquid level, and when tapping is to 4/5, dedusting valve recovers normal, half ladle
Producing without obvious flue dust, in sample analysis bag, phosphorus content reduces by 0.006%.After being blended into steelmaking converter, lower rifle blows, and adds bottom ash
8kg/t, changes slag time shortening 32 seconds, and in flue dust, dust content adds fashionable reduction by 10.3 mg/Nm than with steel scrap3。
Embodiment 2:
Smelting heat 2: this heat half steel temperature 1382 DEG C, half steel phosphorus content 0.164%.Tapping is shaken dedusting ash 6.9kg/ before starting
T, starts tapping, when tapping is to 1/5, and fully open dedusting valve, add dedusting ash 4.2kg/t with steel stream, front and back walk bag 2 times,
After to be melted, adding residue dedusting ash, front and back walk bag 1 time, dedusting ash all melts formation foamed slag and covers half ladle liquid level, goes out
When steel is to 4/5, dedusting valve recovers normal, and half ladle produces without obvious flue dust, and in sample analysis bag, phosphorus content reduces by 0.012%.
After being blended into steelmaking converter, lower rifle blows, and adds bottom ash 6kg/t, changes slag time shortening 51 seconds, and in flue dust, dust content ratio is with steel scrap
Add fashionable reduction by 11.4 mg/Nm3。
Embodiment 3:
Smelting heat 3: this heat half steel temperature 1412 DEG C, half steel phosphorus content 0.189%.Tapping is shaken dedusting ash 9.2kg/ before starting
T, starts tapping, when tapping is to 1/5, and fully open dedusting valve, add dedusting ash 5.1kg/t with steel stream, front and back walk bag 2 times,
After to be melted, adding residue dedusting ash, front and back walk bag 1 time, dedusting ash all melts formation foamed slag and covers half ladle liquid level, goes out
When steel is to 4/5, dedusting valve recovers normal, and half ladle produces without obvious flue dust, and in sample analysis bag, phosphorus content reduces by 0.021%.
After being blended into steelmaking converter, lower rifle blows, and adds bottom ash 4kg/t, changes slag time shortening 56s, and in flue dust, dust content ratio is with steel scrap
Add fashionable reduction by 12.6 mg/Nm3。
Claims (2)
1. the method efficiently utilizing converter dust-removing ash, it is characterised in that: it uses following steps to carry out:
A. controlling half steel temperature and be more than 1250 DEG C, the upper limit meets vanadium extraction ceiling temperature requirement 1420 DEG C；
B. according to half steel temperature dedusting ash consumption 4-10kg/t；
C. start half steel, when tapping is to 1/5, fully open final dusting valve, it is initially added into dedusting ash with steel stream；
D. after dedusting ash adds, front and back walk bag, increase molten steel wriggling in bag, promote that dedusting ash fusing forms foamed slag；
When e. tapping to 4/5, dedusting valve recovers normal；
F., after tapping terminates, prepare to steelmaking converter iron making；
G. after steelmaking converter iron making terminates, lower rifle blows, and adds bottom ash 4-8kg/t, it is not necessary to adds other and changes slag material；
After the most slag melting, operation recovery is normal.
The method efficiently utilizing converter dust-removing ash the most according to claim 1, it is characterised in that: described step c adds
Dedusting ash can divide 1-2 addition, and each addition is less than 5kg/t, after adding dedusting ash for the first time, front and back walks bag, to be melted
After, second time adds residue dedusting ash, more front and back walks bag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610827453.0A CN106282475A (en) | 2016-09-18 | 2016-09-18 | A kind of method efficiently utilizing converter dust-removing ash |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610827453.0A CN106282475A (en) | 2016-09-18 | 2016-09-18 | A kind of method efficiently utilizing converter dust-removing ash |
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| CN201610827453.0A Pending CN106282475A (en) | 2016-09-18 | 2016-09-18 | A kind of method efficiently utilizing converter dust-removing ash |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107557517A (en) * | 2017-08-07 | 2018-01-09 | 河钢股份有限公司承德分公司 | A kind of method using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage |
| CN112280937A (en) * | 2020-09-27 | 2021-01-29 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for deep dephosphorization by using dedusting ash |
| CN112301181A (en) * | 2020-09-21 | 2021-02-02 | 河钢股份有限公司承德分公司 | Method for inhibiting generation of vanadium extraction semisteel smoke dust |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275625A (en) * | 2000-06-07 | 2000-12-06 | 昆明理工大学 | Semi-steel dephosphorizing desulfurizing steel-making technology |
| CN103088186A (en) * | 2013-03-07 | 2013-05-08 | 河北钢铁股份有限公司承德分公司 | Slag-making method for rapid dephosphorization of semisteel |
| CN105063279A (en) * | 2015-08-17 | 2015-11-18 | 河北钢铁股份有限公司承德分公司 | Method for using rotary furnace reclaimed dust for assisting semisteel dephosphorization pretreatment |
-
2016
- 2016-09-18 CN CN201610827453.0A patent/CN106282475A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1275625A (en) * | 2000-06-07 | 2000-12-06 | 昆明理工大学 | Semi-steel dephosphorizing desulfurizing steel-making technology |
| CN103088186A (en) * | 2013-03-07 | 2013-05-08 | 河北钢铁股份有限公司承德分公司 | Slag-making method for rapid dephosphorization of semisteel |
| CN105063279A (en) * | 2015-08-17 | 2015-11-18 | 河北钢铁股份有限公司承德分公司 | Method for using rotary furnace reclaimed dust for assisting semisteel dephosphorization pretreatment |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107557517A (en) * | 2017-08-07 | 2018-01-09 | 河钢股份有限公司承德分公司 | A kind of method using converter dust-removing ash auxiliary semi-steel making dephosphorization early stage |
| CN112301181A (en) * | 2020-09-21 | 2021-02-02 | 河钢股份有限公司承德分公司 | Method for inhibiting generation of vanadium extraction semisteel smoke dust |
| CN112301181B (en) * | 2020-09-21 | 2022-05-24 | 河钢股份有限公司承德分公司 | Method for inhibiting generation of vanadium extraction semisteel smoke dust |
| CN112280937A (en) * | 2020-09-27 | 2021-01-29 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for deep dephosphorization by using dedusting ash |
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