CN101704074B - Preparation method of covering agent of alkaline steel ladle or tundish - Google Patents
Preparation method of covering agent of alkaline steel ladle or tundish Download PDFInfo
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- CN101704074B CN101704074B CN2009102727448A CN200910272744A CN101704074B CN 101704074 B CN101704074 B CN 101704074B CN 2009102727448 A CN2009102727448 A CN 2009102727448A CN 200910272744 A CN200910272744 A CN 200910272744A CN 101704074 B CN101704074 B CN 101704074B
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- covering agent
- ladle
- alkaline
- fused mass
- tundish
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Abstract
The invention discloses a preparation method of a covering agent of alkaline steel ladle or tundish. The method comprises the following steps: performing flash distillation drying to the dehydrated calcium silicon slag at 100-120 DEG C to remove adhesive water and obtain powder material, calcining the powder material at 800-1200 DEG C to obtain calcine, grinding, mixing silica and lime in a weight ratio of 40-50:50-60 evenly to reach 100% of weight fraction, fusing, heating to 1350-1550 DEG C for 8-12h to obtain a fused material of which lithofacies is CaO.SiO2; crushing the fused material, and mixing the fused material with the grinded calcine in a weight ratio of 35-45:55-60 evenly to reach 100% of weight fraction and obtain the covering agent of alkaline steel ladle or tundish. The method of the invention fully uses the calcium-silicon slag generated in the production process of the alumina production enterprise to prepare the covering agent of alkaline steel ladle or tundish, the process method is simple and is easy to control; the energy consumption and cost caused by returning ingredients and sintering are eliminated so as to greatly reduce the production cost of the covering agent of alkaline steel ladle or tundish.
Description
Technical field ladle or middle covering agent are specifically related to the production method of a kind of alkaline ladle or middle covering agent.
Background technology
Steel (in) covering agent be added in steel (in) Baogang liquid surface, be a kind of coverture of its main performance with adiabatic heat-insulation.3 basic functions that it must have are: (1) keeps the powder layer of one deck insulation, thermal insulation on liquid slag blanket, stops molten steel to transmit or radiations heat energy to air.The insulation heat-insulating property is the most important technical indicator of ladle covering agent, and tapping temperature is reduced, and saves energy consumption, improves output.(2) isolated molten steel and surrounding air contacts.(3) do not corrode or corrode less cylinder-packing, do not crust after cast finishes, easily come off from cylinder-packing.Except above-mentioned basic function, also must satisfy some conditions as the coverture of producing the cleaning steel: (1) can not pollute molten steel.(2) can absorb field trash in the molten steel, as Al
2O
3Deng.
The first generation, be the ladle covering agent that uses on the traditional handicraft such as oxide pulvis of carbonization rice husk or carbon containing etc., this pulvis can be divided into acidity or alkalescence according to ladle lining, it mainly acts on is adiabatic heat-insulation, but have the following aspects between topic: (1) is because the fusing point height, be not easy to form fine and close melting zone, contacting of difficult thoroughly air-isolation and molten steel can not absorb field trash; (2) carbon containing is higher, can make molten steel recarburization; (3) SiO
2May pass oxygen to molten steel and cause secondary oxidation, and make molten steel increase silicon.
Along with the needs of the production of high-cleanness, high steel such as continuously casting and continuously rolling technology and ultra-low-carbon steel, steel alloy, people to steel (in) metallurgy action of covering agent also more and more payes attention to.Second generation ladle covering agent can also prevent that except that adiabatic heat-insulation air secondary oxidation and absorption are mingled with, and generally is alkaline covering agent, with CaO-Al
2O
3One SiO
2(on a small quantity) is and CaO one MgO one Al
2O
3One SiO
2(on a small quantity) is the basis, by the mechanical impurity that multi mineral is formed, has good heat-insulating property and metallurgical performance.It can form certain thickness liquid slag layer at molten steel surface, can not only secluding air, and the absorption that helps being mingled with.But produce alkaline covering agent now and all adopt multi mineral production, the production cost height.
Sintering process is produced in the alumina process, and sodium aluminate solution deep desiliconization is to generate calcium aluminate by adding milk of lime, reacting with sodium aluminate solution, and its chemical equation is: 3Ca (OH)
2+ 2NaAl (OH)
4+ xNa
2SiO
3-→ 3CaOAl
2O
3XSiO
2(6-2x) H
2O ↓+2 (1+x) NaOH
Product behind desilication reaction is: 3CaO-Al
2O
3-nSiO
2-(6-2n) H
2O is commonly called as calcium-silicon slag.The existing enterprise that produces aluminium oxide all is that calcium-silicon slag is returned batching, burns till, and repeats processing.The utilization rate of this method calcium-silicon slag is lower and power consumption is high.
Summary of the invention
The object of the present invention is to provide a kind of production method of utilizing calcium-silicon slag to produce alkaline ladle or middle covering agent, to address the above problem.
Technical scheme of the present invention is: the production method of alkaline ladle or middle covering agent, it is that dehydration back calcium-silicon slag is carried out expansion drying at 100～120 ℃, slough the granular material that attached water obtains, granular material is pulverized after obtaining calcined material calcining under 800 ℃～1200 ℃; Silica and lime mixed to a hundred per cent weight fraction by weight 40～50: 50～60 proportionings carry out fusion, be warming up to 1350 ℃～1550 ℃, through 8～12 hours, obtaining petrofacies was CaOSiO
2Fused mass; To be to mix to a hundred per cent weight fraction promptly obtain alkaline ladle or middle covering agent at 35～45: 55～60 by weight with the calcined material of pulverizing after the fused mass fragmentation.
Described 0～30% fixed carbon that adds fused mass weight after the fused mass fragmentation is milled to altogether surmised≤1mm.
Pulverize after the described calcined material be with calcining afterwards product wear into the powder of granularity≤0.088mm through cooling off the laggard ball mill of going into.
Described fused mass fragmentation is to obtain petrofacies fused mass CaOSiO
2Be milled to after the fragmentation and surmise≤powder of 1mm.
The present invention simultaneously to the utilization of calcium-silicon slag and basic steel (in) production of covering agent all proposed brand-new thinking, it makes full use of the main component that produces in the alumina producing enterprise production process is 3CaO-Al
2O
3-nSiO
2-(6-2n) H
2Be used for producing alkaline ladle or covering agent after the calcium-silicon slag of O dehydrates, not only all utilized the active ingredient of calcium-silicon slag, and make the basic steel that makes (in) covering agent have very rationally chemical composition and effectively petrofacies form; Its process is simple, and is easy to control; Simultaneously, for alumina producing enterprise, greatly reduced the circular treatment amount of this slag in aluminum oxide production process, eliminated and to have returned batching, burnt till, repeat to process the energy consumption and the cost that are produced, not only optimized the technical-economic index of alumina producer, also greatly reduce owing to its price is extremely low steel (in) production cost of covering agent.
The specific embodiment
Embodiment 1
The back calcium-silicon slag that will dewater carries out expansion drying at 100～120 ℃, sloughs the granular material that attached water obtains;
Granular material behind the expansion drying enters ignition temperature and is 800 ℃～1200 ℃ calcining furnace, and calcining back product is after cooling, and the powder of wearing into granularity≤0.088mm is stand-by; Can adopt ball mill grinding.Ignition temperature can be the arbitrary temp value between 800 ℃～1200 ℃, as 800 ℃, 850 ℃, 900 ℃, 1000 ℃, 1100 ℃ or 1200 ℃, can realize removing the crystallization water in the calcium-silicon slag like this, or realizes the crystalline phase conversion of the material in the calcium-silicon slag.
Chemical composition sees the following form.
| Title | CaO | Al 2O 3 | SiO 2 | Fe 2O 3 | TiO 2 | R 2O | Igloss |
| ％ | 35-48 | 32-42 | ＜3.5 | ＜1.5 | ＜0.02 | 5-10 | ＜8 |
With silica and lime by weight 45: 55 proportionings mix, carry out fusion, melting condition is: be warming up to 1350 ℃～1550 ℃, through 8～12 hours, making it form main petrofacies was CaOSiO
2Fused mass.Surmise≤1mm being milled to after the fused mass fragmentation.
The powder that calcining back is pulverized and the powder of fused mass fragmentation by weight 40: 60 proportionings mix the carbon-free basic steel that obtains mild steel production and need (in) covering agent.
Carbon-free basic steel (in) the covering agent main component the following is:
| Title | CaO | Al 2O 3 | SiO 2 | MgO | R 2O | Fe 2O 3 | Igloss |
| ％ | 30-50 | 12-18 | 15-30 | 0-5 | 3-8 | ≤3 | ≤5 |
Embodiment 2
The back calcium-silicon slag that will dewater carries out expansion drying at 100～120 ℃, sloughs the granular material that attached water obtains;
Granular material behind the expansion drying enters ignition temperature and is 1100 ℃ calcining furnace, and calcining back product is after cooling, and the powder of wearing into granularity≤0.088mm is stand-by; Can adopt ball mill grinding.
Chemical composition sees the following form.
| Title | CaO | Al 2O 3 | SiO 2 | Fe 2O 3 | TiO 2 | R 2O | Igloss |
| ％ | 35-48 | 32-42 | ＜3.5 | ＜1.5 | ＜0.02 | 5-10 | ＜8 |
With silica and lime by weight 45: 55 proportionings mix, carry out fusion, melting condition is: be warming up to 1350 ℃～1550 ℃, through 8～12 hours, making it form main petrofacies was CaOSiO
2Fused mass.Be milled to altogether and surmise≤1mm adding 0～30% fixed carbon according to the difference of steel grade after the fused mass fragmentation.Surmise≤1mm being milled to after the fused mass fragmentation.
The powder that calcining back is pulverized and the powder of fused mass fragmentation by weight 50: 50 proportionings mix the carbon-free basic steel that obtains mild steel production and need (in) covering agent.The carbon containing basic steel (in) the covering agent main component is:
| Title | CaO | Al 2O 3 | SiO 2 | MgO | C | R 2O | Fe 2O 3 | Igloss |
| ％ | 30-45 | 5-15 | 15-30 | 0-5 | 0-15 | 1-5 | ≤3 | ≤5 |
Alkaline ladle or middle covering agent to said method production detect:
1, the spreadability of check coverture;
2, the heat insulation effect of check coverture;
3, check the influence of coverture to the steel carbon content:
1 test steel grade:
WSPCC, TSPA-H, Q235B, No. 45 etc.
2 testing programs:
Producer provides each 3t of covering agent in carbon containing basic steel covering agent and the carbon-free high basicity, carries out type approval test with conticaster respectively on the ladle of 300t.Test is after the molten steel Argon finishes, and every jar of molten steel adds carbon containing basic steel covering agent 30 bags (150kg)
3 physicochemical properties:
Carbon containing basic steel covering agent physicochemical property:
4 interpretations of result:
This test is totally 15 stoves, and the test synthesis result sees the following form:
| Project | Out-station temperature ℃ | Platform temperature ℃ | In bag temperature ℃ | Behind the argon to platform time min | Temperature drop ℃ * min -1 | Big-and-middle bag temperature drop ℃ | Carburetting * 10 -5 |
| Fluctuation range | 1527~ 1589 | 1529~ 1588 | 1504.8~ 1555.5 | 5~10 | 0.13~ 0.43 | 21.8~ 33.8 | -12~ +8 |
| Mean value | 1563.5 | 1563.1 | 1536.6 | 7.2 | 0.28 | 26.12 | 2.3 |
1) Shi Yan two kinds of coverture spreadabilities are good, add fashionable dust and slag and splash lessly, find the crust phenomenon in the process of the test;
2) finishing to the average temperature drop rate of the molten steel of casting platform from Argon is 0.28 ℃/min, and the average temperature drop of molten steel is 26.12 ℃ in the ladle, shows that heat insulation effect is good;
3) by molten steel sample after the Argon and casting finished product sample carbon content check result as can be known, the use of coverture is less to the carbon content of molten steel influence.
5 brief summaries
This type approval test has been obtained the test effect of expection, has obtained affirming of production operation personnel.Result of the test shows that the carbon containing alkalescence molten steel covering agent spreadability and the heat insulation effect of production are good; Molten steel and finished product sample carbon content are basic identical after the Argon, and molten steel composition is not had influence.Can satisfy the production needs of existing high-quality steel grade fully, suggestion enlarges to be used.
Covering agent in the carbon-free alkalescence
1, test technology flow process and scheme
1.1 test technology flow process
40 tons of electric arc furnaces------40 tons of ladle refining furnaces------40 tons of vacuum degassing furnaces------conticaster
1.2 the bag melting steel amount is in the conticaster: 18～20 tons
1.3 testing program
The test steel grade is the 20CrMnTi steel.
Test open water after, middle bag liquid level add during greater than 400mm carbon-free in covering agent 8 bags (10 kilograms of every bags), after add carbonized rice husks 4 bags again.After this casting process no longer adds coverture and carbonized rice husks.
Every stove is got the same in the middle bag of unwrapping greatly after watering 15 minutes with sampler, send the laboratory to do complete analysis; Materials after one heat steel become a useful person and do micro test and observe the field trash situation.
Observe covering agent in the casting process heat insulation effect, add fashionable spreading property and pour the erosion condition of back stopper, cylinder-packing.
2, test results and analysis
2.1, spreadability: it is good to add fashionable spreadability, can scatter immediately.
2.2, heat insulating ability: the casting process heat insulation effect is better, and temperature does not have big fluctuation, and the top of the slag does not have the crust phenomenon.
2.3, to the erosion of cylinder-packing: more no abnormal situation.
2.4, middle Baogang water carburetting situation: with big bag sample ratio, carburetting 0～0.02%, average carburetting 0.0056%, as following table:
2.5, to the molten steel pollution condition:
The check of high power field trash is done in become a useful person back sampling to epicycle first stove, and situation is as follows:
| Heat (batch) number | A | B | C | D |
| 1 | 1.0 | 1.5 | 0.5 | 0.5 |
This shows that the test coverture is to the molten steel non-secondary pollution.
2.6, consumption: 544.794 tons of the total taps of epicycle.Coverture consumption 8 bag * 10Kg/ bag=80Kg, average 0.147Kg/ ton.
3, conclusion
3.1, spreadability: it is good to add fashionable spreadability, can scatter immediately.
3.2, heat insulating ability: adding under the condition of carbonized rice husks, the casting process heat insulation effect is better, and temperature does not have big fluctuation, does not have the crust phenomenon.
3.3, to the etch of cylinder-packing: more no abnormal situation, little to the cylinder-packing etch.
3.4, middle Baogang water carburetting situation: with big bag sample ratio, average carburetting 0.0058%, effect still can.
3.5, to the molten steel pollution condition: the test coverture is to the molten steel non-secondary pollution.
3.6, consumption: test coverture consumption is at 0.147Kg/ ton steel, and economic benefit is obvious.
Claims (5)
1. the production method of an alkaline ladle or middle covering agent, it is that dehydration back calcium-silicon slag is carried out expansion drying for 100～120 ℃, sloughs the granular material that attached water obtains, and granular material is pulverized after obtaining calcined material calcining under 800 ℃～1200 ℃; Silica and lime mixed to a hundred per cent weight fraction by weight 40～50: 50～60 proportionings carry out fusion, be warming up to 1350 ℃～1550 ℃, through 8～12 hours, obtaining petrofacies was CaOSiO
2Fused mass; To be to mix in 40: 60 or 50: 50 to a hundred per cent weight fraction promptly to obtain alkaline ladle or middle covering agent by weight with the calcined material of pulverizing after the fused mass fragmentation.
2. the production method of alkaline according to claim 1 ladle or middle covering agent, it is characterized in that pulverizing after the described calcined material be with calcining afterwards product wear into the powder of granularity≤0.088mm through cooling off the laggard ball mill of going into.
3. the production method of alkaline according to claim 1 ladle or middle covering agent is characterized in that described fused mass fragmentation is to obtain petrofacies fused mass CaOSiO
2Be milled to after the fragmentation and surmise≤powder of 1mm.
4. the production method of alkaline according to claim 1 ladle or middle covering agent is characterized in that described silica and lime mix and are a hundred per cent weight fraction by weight 45: 55 proportioning.
5. the production method of alkaline according to claim 1 ladle or middle covering agent is characterized in that described 0～30% fixed carbon that adds fused mass weight after the fused mass fragmentation is milled to altogether surmise≤1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102727448A CN101704074B (en) | 2009-11-10 | 2009-11-10 | Preparation method of covering agent of alkaline steel ladle or tundish |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009102727448A CN101704074B (en) | 2009-11-10 | 2009-11-10 | Preparation method of covering agent of alkaline steel ladle or tundish |
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| Publication Number | Publication Date |
|---|---|
| CN101704074A CN101704074A (en) | 2010-05-12 |
| CN101704074B true CN101704074B (en) | 2011-08-17 |
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Denomination of invention: Preparation method of covering agent of alkaline steel ladle or tundish Effective date of registration: 20120113 Granted publication date: 20110817 Pledgee: Bank of Hankou, Limited by Share Ltd, Jianghan subbranch Pledgor: Wuhan Zhenhai Technology Co., Ltd. Registration number: 2012990000025 |
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Denomination of invention: Preparation method of covering agent of alkaline steel ladle or tundish Effective date of registration: 20130320 Granted publication date: 20110817 Pledgee: Wuhan East investment Company limited by guarantee Pledgor: Wuhan Zhenhai Technology Co., Ltd. Registration number: 2013990000159 |
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Denomination of invention: Preparation method of covering agent of alkaline steel ladle or tundish Effective date of registration: 20150422 Granted publication date: 20110817 Pledgee: Wuhan East investment Company limited by guarantee Pledgor: Wuhan Zhenhai Technology Co., Ltd. Registration number: 2015990000309 |
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