CN102220455A - Production method for high alkalinity steel-making refining slag - Google Patents
Production method for high alkalinity steel-making refining slag Download PDFInfo
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- CN102220455A CN102220455A CN2011101922830A CN201110192283A CN102220455A CN 102220455 A CN102220455 A CN 102220455A CN 2011101922830 A CN2011101922830 A CN 2011101922830A CN 201110192283 A CN201110192283 A CN 201110192283A CN 102220455 A CN102220455 A CN 102220455A
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- lime
- steel
- powder
- refining slag
- limekiln
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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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Abstract
The invention discloses a production method for a high alkalinity steel-making refining slag, which is used for an outer-steel furnace refining technology and solves the problems of hydrated pulverized limestone and slow melting when adding lime block. The method comprises the following steps: fragmenting and milling lime sintered in a limekiln, placing grinded lime fine powder to a boiling bed at a temperature range of 650 - 750 DEG C and introducing exhaust gas and water vapor discharged by sintering calcined lime in the limekiln, using CO2 in the exhaust gas discharged from the calcined lime in the limekiln for performing a passivation and a hydration-proof treatment to the surface of lime, using water vapor to accelerate the passivating treatment to the lime surface by CO2, then mixing the passivated pulverized limestone with cosolvent powder, balling and sieving by a wet method or a dry method. The invention has the advantages of high alkalinity, fast melting speed, good spreadability, low cost and long storing time. Time for outer-steel secondary refining can be shorten, desulfurization rate and dephosphorization rate of the outer-steel secondary refining technology can be improved, simultaneously the CO2 exhaust gas discharged from calcined lime in the limekiln is used.
Description
Technical field
The present invention relates to make steel the production method of refining slag, particularly a kind of production method of high basicity steel-making refining slag.
Background technology
Steel-making furnace outer refining process molten steel takes off S and takes off P requirement refining slag basicity height, burn-off rate is fast, usually adopt adding lime to improve refining slag basicity, but lime fusing point height (2600 ℃), the fusing point of refining slag increases with the increase of lime adding amount, because the easy aquation of lime powder adds with lime block usually, high basicity refining slag outside steel melting furnace in the refining temperature scope (1600～1700 ℃) burn-off rate slow, influence refining effect, outside steel melting furnace, in the refining cycle, can not give full play to the effect of refining slag.Utilize 50%CaO and 50%Al
2O
3The characteristics of melting point compound about 1400 ℃ adopt lime and bauxitic clay (Al
2O
3Be main) mixing fritting, form about CaO50%, Al
2O
3Calcium aluminate pro-molten refining slag about 40% is used to make steel furnace outer refining process.Though the low fusing speed of calcium aluminate pro-molten refining slag fusing point is fast, but its CaO content requirement of not satisfying high basicity on the low side, also need to add lime block and improve refining slag basicity, the burn-off rate of corresponding prolongation refining slag, calcium aluminate pro-molten refining slag cost is higher simultaneously.If can adopt lime powder to mix the burn-off rate that to accelerate lime refining process outside steel melting furnace with the flux pulvis.The applicant once applied for " production method of water-repellancy high-alkalinity steel-making out-furnace refining slag " patent, and authorized.Granted publication CN1332041C, this patent adopts stearic acid surface passivation agent that the lime fine powder is carried out the passivation preventing hydration and handles, then the lime fine powder after the passivation is mixed with solubility promoter fine powders such as fluorites, with the granularity balling-up of wet method or dry method, be used to make steel furnace outer refining process by the requirement of steel-making furnace outer refining process.Solve the lime powder aquation and added the slow problem of lime block fusing.But surface passivation agent such as stearic acid are undesirable to lime fine powder surface passivation preventing hydration treatment effect.
Summary of the invention
The invention provides a kind of production method of high basicity steel-making refining slag, be used to make steel furnace outer refining process, solved the lime powder aquation and added the slow problem of lime block fusing.
The production method of high basicity steel-making refining slag provided by the invention comprises following content:
The lime that the limestone kiln has just been burnt till carries out fragmentation and abrasive dust, and it is 650～750 ℃ ebullated bed that the lime fine powder of wearing into is put into temperature, feeds waste gas and water vapour that the limestone kiln calcined lime is discharged, utilizes the CO in the calcined lime combustion gas of limestone kiln
2The passivation preventing hydration is carried out on the lime surface handle, utilize water vapour to quicken CO
2The Passivation Treatment that the lime surface is carried out.Then the lime powder after the passivation is mixed with the solubility promoter powder, with wet method or dry method balling-up, sieve.
Described solubility promoter powder adopts fluorite.
The present invention compared with prior art has the high characteristics of basicity, can require to adjust according to the steel-making furnace outer refining process.Burn-off rate is fast, spreadability good, cost is low, waiting time is long.Can shorten the outer refining time of steel melting furnace, improve steel-making furnace outer refining process molten steel and take off the S P removal rate; Utilize the CO in the calcined lime combustion gas of limestone kiln simultaneously
2The passive lime powder reduces CO
2The environmental pollution that produces.
Description of drawings
Fig. 1 is the production method FB(flow block) synoptic diagram of high basicity steel-making refining slag.
Embodiment
As shown in Figure 1, the lime that rotary kiln is produced adds in the Raymond machine and is broken into＜100 purpose fine powders, and the fine powder that mill is good is put into ebullated bed, and the temperature of ebullated bed is controlled at 650～750 ℃.The kiln gas that rotary kiln is discharged carries out the secondary-cleaned dedusting.Through the kiln gas of purifying treatment, CO
2Content about 30%.The heat that utilizes rotary kiln to discharge is produced water vapour by thermoconverter.The kiln gas and the water vapour that purified are fed ebullated bed, the lime fine powder carried out 5～20 minutes surface carbon acidification, then that the lime fine powder cooling back of passivation is mixing with solubility promoter fluorite fine powder, be rolled into or make the block ball that the ball extrusion machine is squeezed into size range 5～20mm by the pelletizing pelletizer, the pack packing of sieving.Or with dry method by 1～3 MPa pressing machine directly with the mixing powder that mixes, be pressed into the block ball of size range 5～30mm, the pack packing of sieving.
Claims (2)
1. the production method of one kind high basicity steel-making refining slag is characterized in that this method comprises following content:
The lime that employing has just been burnt till the limestone kiln carries out fragmentation and abrasive dust, and it is 650～750 ℃ ebullated bed that the lime fine powder of wearing into is put into temperature, feeds waste gas and water vapour that the limestone kiln calcined lime is discharged, utilizes the CO in the calcined lime combustion gas of limestone kiln
2The passivation preventing hydration is carried out on the lime surface handle, utilize water vapour to quicken CO
2To the Passivation Treatment that carry out on the lime surface, then the lime powder after the passivation is mixed with the solubility promoter powder, with wet method or dry method balling-up, sieve.
2. the production method of the described high basicity steel-making refining slag of claim 1 is characterized in that said solubility promoter powder adopts fluorite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101922830A CN102220455A (en) | 2011-07-09 | 2011-07-09 | Production method for high alkalinity steel-making refining slag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101922830A CN102220455A (en) | 2011-07-09 | 2011-07-09 | Production method for high alkalinity steel-making refining slag |
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|---|---|
| CN102220455A true CN102220455A (en) | 2011-10-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011101922830A Pending CN102220455A (en) | 2011-07-09 | 2011-07-09 | Production method for high alkalinity steel-making refining slag |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866086A (en) * | 2014-03-19 | 2014-06-18 | 辽宁科技大学 | Production method of double deoxidizer for steelmaking |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1743467A (en) * | 2005-10-05 | 2006-03-08 | 鞍山科技大学 | Water-repellancy high-alkalinity steel-making out-furnace refining slag production method |
-
2011
- 2011-07-09 CN CN2011101922830A patent/CN102220455A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1743467A (en) * | 2005-10-05 | 2006-03-08 | 鞍山科技大学 | Water-repellancy high-alkalinity steel-making out-furnace refining slag production method |
Non-Patent Citations (2)
| Title |
|---|
| 《武钢技术》 20081031 曹同友等 活性石灰碳酸化的研究 21-23 1-2 第46卷, 第5期 * |
| 《钢铁》 20000930 姜周华等 高流动性防潮石灰粉剂的研制及应用 13-16、23 1-2 第35卷, 第9期 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103866086A (en) * | 2014-03-19 | 2014-06-18 | 辽宁科技大学 | Production method of double deoxidizer for steelmaking |
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Application publication date: 20111019 |