CN103740893A - High-alkalinity compound particle covering agent and production method thereof - Google Patents
High-alkalinity compound particle covering agent and production method thereof Download PDFInfo
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- CN103740893A CN103740893A CN201410006501.0A CN201410006501A CN103740893A CN 103740893 A CN103740893 A CN 103740893A CN 201410006501 A CN201410006501 A CN 201410006501A CN 103740893 A CN103740893 A CN 103740893A
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
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Abstract
The invention discloses a high-alkalinity compound particle covering agent which is characterized by comprising the following raw materials: 59.5-70 percent of carbonized straw, 29.5-40 percent of lime and 0.5 percent of binder CMC (carboxymethylcellulose). The invention further provides a production method of the covering agent. The production method comprises the steps: crushing and grinding a required raw material according to a ratio, extruding the uniformly mixed material into a finished product with a particle size of 0.2-4mm through granulation equipment. The content of carbon in the high-alkalinity compound particle covering agent produced by the method is less than 0.5 percent and R (alkalinity) is more than 1.2; the production process is simple and low in cost; and the high-alkalinity compound particle covering agent is used for insulation of a steel ladle and a tundish, is capable of ensuring that molten steel is not recarburized, is environmentally friendly, and is especially suitable for being used as a steel ladle covering agent during smelting of low-carbon and ultra-low carbon steel.
Description
Technical field
The present invention relates to a kind of high alkalinity composite particles insulating covering agent and production method thereof, belong to the field of smelting of metallurgical ladle, specifically relate to ladle, refining, casting process insulating covering agent.
Background technology
Ladle covering agent is in smelting molten steel process, to join the subsidiary material that cover a kind of synthetic of molten steel surface in ladle.It has following functions:
(1) adiabatic heat-insulation, prevent molten steel face crust.Insulating covering agent has significant adiabatic heat-insulation effect.Insulating covering agent covers molten steel surface, prevents that the exposed liquid steel temperature that causes in air of molten steel from declining rapidly, thereby causes liquid level crust, the mouth of a river to freeze;
(2) completely cut off air, prevent secondary oxidation of steel.After insulating covering agent adds, form ventilation property poor liquid slag layer, molten steel is completely cut off and opened with air, prevented the secondary oxidation of molten steel, reduced the inclusion of molten steel;
(3) absorb the non-metallic inclusion on molten steel face, purify hot metal.Insulating covering agent forms certain thickness molten slag layer at molten steel surface, can adsorb and float to the sestons such as the non-metallic inclusion, fire resisting material particle of molten steel surface, plays the effect of purify hot metal.
Most steel mill, most of steel grade are used mostly is ordinary steel covering agent, and this type of ladle covering agent be acidity, and main component is SiO
2, Al
2o
3, CaO, MgO, C, wherein, w (SiO
2) > 40%, w (C)=15 ~ 40%, w (CaO)/w (SiO
2) < 0.5.The great advantage of acid insulating covering agent is high insulating effect, and disadvantage is can not purify hot metal, even also may pollute molten steel.Therefore, alkaline covering agent that can purify hot metal is developed thereupon, and still, the disadvantage of alkaline covering agent is that heat retaining property is poor, and its thermal conductivity is acid 2 times.
In addition, in steel, carbon content is one of the element that must control in Clean Steel production process, the general all a large amount of carbonaceous materials of content of insulating covering agent that domestic iron and steel enterprises is used, and this can make the content of carbon in molten steel composition increase.Will effectively prevent the carburetting of molten steel in ladle, preferably use the ladle covering agent of carbon-free or micro-carbon, this just requires the content of carbonaceous material in ladle covering agent low as far as possible.
Summary of the invention
Can not purify hot metal for above acid insulating covering agent, and alkaline covering agent heat insulation effect is poor and carbon content is high, the present invention aims to provide a kind of high insulating effect, the ultralow high alkalinity composite particles insulating covering agent of carbon content, product result of use is good, can reduce molten steel calorific loss, again can purify hot metal, also can not cause molten steel recarburization simultaneously, and environmentally friendly.The present invention also provides the production method of insulating covering agent.
The technical solution used in the present invention is: a kind of high alkalinity composite particles insulating covering agent, is characterized in that: the raw material that comprises following component:
Carbonization stalk 59.5% ~ 70%,
Lime 29.5 ~ 40%,
Binding agent CMC(carboxymethyl cellulose) 0.5%.
The performance perameter of described particle insulating covering agent is:
SiO
2：27.68~37.68%；
Al
2O
3≤7.0%；
CaO：27.09~39.09%；
MgO≤3.79%；
C＜0.5%；
Fusing point >=1200 ℃;
Molten speed >=60s;
Unit weight: 0.5 ~ 0.8.
The present invention also provides a kind of production method of high alkalinity composite particles insulating covering agent, it is characterized in that: desired raw material is pulverized to grinding in proportion, it is 0.2mm ~ 4mm that the material mixing is squeezed into granularity through granulating equipment again, the finished product of basicity R > 1.2, specifically comprises the following steps:
(1) desired raw material is pulverized and ground
Carbonization stalk and lime are sent into 4R grinding machine through electroshock feeding machine again after composite crusher is crushed to 1mm, are below 100 orders through 4R grinding machine abrasive dust to granularity;
(2) batch mixing
Material after grinding is sent into mixer through measuring belt, adds binding agent, after material mixes, through chapelet, enters intermediate bin;
(3) roll-in
Material is sent into roll squeezer by forced feed machine, and pulverulent material is pressed into strip or cylindric block of material; Forced feed system adopts 11kW motor variable-frequency speed-regulating, roll-in main engine power 75kW, total power 87.5kW, is comprised of fixed bearing block and plain bearing housing, two Alloyed Steel Rolls, hydro-cylinder, pumping plant, double output shaft hard-tooth surface speed reducer, shaft coupling, 75kW electric motor.Electric motor drives the running of double output shaft hard-tooth surface speed reducer by belt, and shaft coupling is connected it with roll squeezer roll, when step-down gear running is also with transmission roller press roll to do extruding work simultaneously.
In described roll-in process, pressure is 14MPa, is pressed into the strip-shaped materials of 100*10*5mm.
(4) broken, granulation
Under strip-shaped materials nature, drop into crushed machine and be broken into the fragment of 4mm; through tablets press, form again the nearly spherical particles of 4mm; fragmentation is done high speed rotating by 7.5kW driven by motor main shaft and will be rolled sheet fragmentation; broken rotating speed is 750 ~ 900rpm; tablets press is by granulation casing, and granulation main shaft, is with many broken rotating cylinder cutter and the aperture 0.2 ~ 4mm screen cloth formation of grinding; by 7.5kW motor ~ belt pulley, drive main shaft to do screen cloth granulation, granulation rotating speed: 150 ~ 250rpm.
(5) screening
Finally by screening, the salable product material of 0.2 ~ 4mm granularity enters finished bin, and the material that the material that is greater than 4mm turns back in crushed machine, be less than 0.2mm turns back in intermediate bin, re-starts granulation.
For product of the present invention, both require not carbon containing, required again the target that heat insulation effect is good, under the lime of raw material employing 29.5 ~ 40% of the present invention and 59.5% ~ 70% high temperature, calcined the carbonization stalk after carbon elimination.The stalk of high-temperature calcination and the use of lime can ensuring coverage agent high alkalinity, thereby be conducive to purify hot metal; Stalk after high-temperature calcination carbon elimination contains few carbon, can guarantee can not cause molten steel recarburization; Meanwhile, the minimizing of carbon content does not affect the heat insulation effect of insulating covering agent, and this is to be determined by the microtexture of carbonization stalk very advantageous.On the one hand, carbonization stalk porous, cellular microtexture can effectively reduce thermal conductivity, play good insulation insulation effect; On the other hand, the composition SiO of ash content in carbonization stalk
2, its fusing point exceedes liquid steel temperature, thereby does not melt, and has played the effect of carbon skeleton, makes thermal insulation layer can keep spumescence loose condition (of surface), without obviously subsiding; In addition, carbonization stalk angle of repose is 38.66 ℃, has good mobility and spreadability, can at molten steel surface, sprawl rapidly less calorific loss.
Because carbonization stalk density is too low, during use, dust is serious, easily causes environmental pollution.For this problem, the present invention adopts granulation extrusion equipment, meets the requirement of environmental protection.
To sum up, the present invention, by the design to proportioning raw materials, has realized C content < 0.5%, the requirement of R (basicity) > 1.2.
High alkalinity composite particles insulating covering agent provided by the invention and production method thereof, the beneficial effect bringing:
(1) insulating covering agent of the present invention is high alkalinity composite particles insulating covering agent, is conducive to purify hot metal;
(2) product carbon content of the present invention is few, can be to molten steel recarburization, and molten steel composition is guaranteed, be particluarly suitable for as ladle covering agent, using in the smelting of low-carbon (LC) and ultra low-carbon steel;
(3), from heat insulation effect, the microtexture that carbonization stalk is favourable and physical property make it have splendid heat insulation effect;
(4) insulating covering agent that at present a lot of steel mills are used is powdery, and the present invention, owing to having used extruding granulation equipment, makes product be particulate state, and when particle insulating covering agent is used at the scene, dust is few, environmentally friendly;
(5) production method provided by the invention, production technique is simple, and rich raw material sources, low price, production cost is low, can reduce steel-making cost.
The invention of high alkalinity composite particles insulating covering agent is except producing the beneficial effects such as insulation, purification, not carburetting molten steel, and a large amount of uses of raw material carbonization stalk also have very large social benefit and environmental benefit.In recent years, along with the raising of life in the countryside level, have a large amount of agricultural crop straws of extensive use to be thrown aside, in order to solve stalk in field, pile up problem, a large amount of stalks, by open incineration, produce serious environmental pollution, and cause certain potential safety hazard.The particle insulating covering agent product that the present invention develops take agricultural crop straw as main raw material has not only utilized the high value advantageous property of stalk at low cost, and has protected environment, has very large economic benefit, social benefit and environmental benefit.
Below in conjunction with embodiment and accompanying drawing, the present invention will be further described, but be not limited to following examples.
Accompanying drawing explanation
fig. 1 isthe production scheme of high alkalinity composite particles insulating covering agent.
Embodiment
Embodiment 1: the production method of high alkalinity composite particles insulating covering agent
Choose raw material:
Carbonization stalk 59.5kg
Lime 40kg
Binding agent CMC 0.5kg
Concrete operation steps is:
(1) desired raw material is pulverized and ground: 59.5kg carbonization stalk and 40kg lime are sent into 4R grinding machine through electroshock feeding machine again after composite crusher is crushed to 1mm, are below 100 orders by mixture abrasive dust to granularity in 4R grinding machine.
(2) batch mixing: the material mixing is sent into mixer through measuring belt, add binding agent, after material mixes, enter intermediate bin through chapelet;
(3) roll-in :-100 object mixtures are sent into roll squeezer by forced feed machine, pulverulent material is pressed into strip or cylindric block of material; In roll-in process, pressure is 14MPa, is pressed into the strip-shaped materials of 100*10*5mm.
Forced feed system adopts 11kW motor variable-frequency speed-regulating, main engine power 75kW, total power 87.5kW, is comprised of fixed bearing block and plain bearing housing, two Alloyed Steel Rolls, hydro-cylinder, pumping plant, double output shaft hard-tooth surface speed reducer, shaft coupling, 75kW electric motor.Electric motor drives the running of double output shaft hard-tooth surface speed reducer by belt, and shaft coupling is connected it with tablets press roll, when step-down gear running also drives tablets press roll to do extruder grain work simultaneously.
(4) broken, granulation: the fragment of dropping into crushed machine under strip-shaped materials nature and be broken into 4mm; through tablets press, form again the nearly spherical particles of 4mm; fragmentation is done high speed rotating by 7.5kW driven by motor main shaft and will be rolled sheet fragmentation; broken rotating speed is 750 ~ 800rpm; tablets press is by granulation casing, and granulation main shaft, is with many broken rotating cylinder cutter and the aperture 0.2 ~ 4mm screen cloth formation of grinding; by 7.5kW motor ~ belt pulley, drive main shaft to do screen cloth granulation, granulation rotating speed is 150 ~ 180rpm.
(5) screening
Finally by screening, the salable product material of 0.2 ~ 4mm granularity enters finished bin, and the material that the material that is greater than 4mm turns back in crushed machine, be less than 0.2mm turns back in intermediate bin, re-starts granulation.
Aluminium, calcium, magnesium are surveyed by EDTA volumetry in laboratory; Survey silicon by weighting method; With carbon sulphur instrument carbon determination, with melting point apparatus, fusing point, molten speed are measured, record particular product performance parameters as follows:
embodiment 2:
Choose raw material:
Carbonization stalk 70kg
Lime 29.5kg
Binding agent CMC 0.5kg
Working method is substantially the same manner as Example 1.Concrete operation steps is:
(1) by desired raw material pulverize grind: 70kg carbonization stalk and 29.5kg lime are sent into 4R grinding machine through electroshock feeding machine again after composite crusher is crushed to 1mm, in 4R grinding machine by below mixture abrasive dust to 100 order.
(2) batch mixing: the material mixing is sent into mixer through measuring belt, add binding agent, after material mixes, enter intermediate bin through chapelet;
(3) roll-in :-100 object mixtures are sent into roll squeezer by forced feed machine, pulverulent material is pressed into strip or cylindric block of material; In roll-in process, pressure is 14MPa, is pressed into the strip-shaped materials of 100*10*5mm.
(4) broken, granulation: the fragment of dropping into crushed machine under strip-shaped materials nature and be broken into 4mm; through tablets press, form again the nearly spherical particles of 4mm; fragmentation is done high speed rotating by 7.5kW driven by motor main shaft and will be rolled sheet fragmentation, and broken rotating speed is 800 ~ 850rpm, and granulation rotating speed is 180 ~ 210rpm.
(5) screening: finally by screening, the salable product material of 0.2 ~ 4mm granularity enters finished bin, the material that the material that is greater than 4mm turns back in crushed machine, be less than 0.2mm turns back in intermediate bin, re-starts granulation.
Laboratory is tested according to EDTA volumetry survey aluminium, calcium, magnesium, by weighting method, surveys silicon, and carbon is tested with carbon sulphur instrument, with melting point apparatus, fusing point, molten speed is measured, and records particular product performance parameters as follows:
embodiment 3:
Choose raw material:
Carbonization stalk 64.75kg
Lime 34.75kg
Binding agent CMC 0.5kg
Working method is substantially the same manner as Example 1.Concrete operation steps is:
(1) by desired raw material pulverize grind: 64.75kg carbonization stalk and 34.75kg lime are sent into 4R grinding machine through electroshock feeding machine again after composite crusher is crushed to 1mm, in 4R grinding machine by below mixture abrasive dust to 100 order.
(2) batch mixing: the material mixing is sent into mixer through measuring belt, add binding agent, after material mixes, enter intermediate bin through chapelet;
(3) roll-in :-100 object mixtures are sent into roll squeezer by forced feed machine, pulverulent material is pressed into strip or cylindric block of material; In roll-in process, pressure is 14MPa, is pressed into the strip-shaped materials of 100*10*5mm.
(4) broken, granulation: the fragment of dropping into crushed machine under strip-shaped materials nature and be broken into 4mm; through tablets press, form again the nearly spherical particles of 4mm; fragmentation is done high speed rotating by 7.5kW driven by motor main shaft and will be rolled sheet fragmentation, and broken rotating speed is 850 ~ 900rpm, and granulation rotating speed is 210 ~ 250rpm.
(5) screening: finally by screening, the salable product material of 0.2 ~ 4mm granularity enters finished bin, the material that the material that is greater than 4mm turns back in crushed machine, be less than 0.2mm turns back in intermediate bin, re-starts granulation.
Laboratory is tested according to EDTA volumetry survey aluminium, calcium, magnesium, by weighting method, surveys silicon, and carbon is tested with carbon sulphur instrument, with melting point apparatus, fusing point, molten speed is measured, and records particular product performance parameters as follows:
Claims (5)
1. a high alkalinity composite particles insulating covering agent, is characterized in that: the raw material that comprises following component:
Carbonization stalk 59.5% ~ 70%,
Lime 29.5 ~ 40%,
Binding agent 0.5%;
Described binding agent is CMC carboxymethyl cellulose.
2. high alkalinity composite particles insulating covering agent according to claim 1, is characterized in that: the performance perameter of described particle insulating covering agent is:
SiO
2：27.68~37.68%；
Al
2O
3≤7.0%；
CaO：27.09~39.09%；
MgO≤3.79%；
C＜0.5%；
Fusing point >=1200 ℃;
Molten speed >=60s;
Unit weight: 0.5 ~ 0.8.
3. the production method of the high alkalinity composite particles insulating covering agent described in a claim 1 or 2, it is characterized in that: desired raw material is pulverized to grinding in proportion, it is 0.2mm ~ 4mm that the material mixing is squeezed into granularity through granulating equipment again, the finished product of basicity R > 1.2, specifically comprises the following steps:
(1) desired raw material is pulverized and ground;
Carbonization stalk and lime are sent into 4R grinding machine through electroshock feeding machine again after composite crusher is crushed to 1mm, are below 100 orders through 4R grinding machine abrasive dust to granularity;
(2) batch mixing
Material after grinding is sent into mixer through measuring belt, adds binding agent, after material mixes, through chapelet, enters intermediate bin;
(3) roll-in
Material is sent into roll squeezer by forced feed machine, and pulverulent material is pressed into strip or cylindric block of material;
(4) broken, granulation
Under strip-shaped materials nature, drop into crushed machine and be broken into the fragment of 4mm, then through tablets press, form the spherical particles of 4mm,
(5) screening
Finally by screening, the salable product material of 0.2 ~ 4mm granularity enters finished bin, and the material that the material that is greater than 4mm turns back in crushed machine, be less than 0.2mm turns back in intermediate bin, re-starts granulation.
4. the production method of high alkalinity composite particles insulating covering agent according to claim 3, is characterized in that: in described roll-in process, pressure is 14MPa, is pressed into the strip-shaped materials of 100*10*5mm.
5. the production method of high alkalinity composite particles insulating covering agent according to claim 3, is characterized in that: in described fragmentation, granulation process, broken rotating speed is 750 ~ 900rpm, the mesh size in tablets press is 0.2 ~ 4mm, and granulation rotating speed is 150 ~ 250rpm.
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|---|---|---|---|
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|---|---|---|---|
| CN201410006501.0A CN103740893B (en) | 2014-01-07 | 2014-01-07 | High alkalinity composite particles insulating covering agent and production method thereof |
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| CN103740893B CN103740893B (en) | 2015-09-02 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106305440A (en) * | 2016-08-20 | 2017-01-11 | 庄美红 | Production process of bentonite crushed cat litter and manufacturing equipment thereof |
| CN108480579A (en) * | 2018-06-29 | 2018-09-04 | 西峡县西保冶金材料有限公司 | A kind of special low silicon Ultra-low carbon coverture of automobile slab and preparation method thereof |
| CN110387480A (en) * | 2019-08-21 | 2019-10-29 | 闻喜县凯利达贸易有限公司 | A kind of particle refining agent used for magnesium alloy and preparation method thereof |
| CN111659519A (en) * | 2020-06-29 | 2020-09-15 | 江苏沙钢集团有限公司 | KR desulfurizer circulating granulation method |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1371772A (en) * | 2001-02-23 | 2002-10-02 | 上海宝谊保温材料有限公司 | Alkaline granule steel ladle covering agent |
-
2014
- 2014-01-07 CN CN201410006501.0A patent/CN103740893B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1371772A (en) * | 2001-02-23 | 2002-10-02 | 上海宝谊保温材料有限公司 | Alkaline granule steel ladle covering agent |
Non-Patent Citations (1)
| Title |
|---|
| 康彦萍等: "新型微碳碱性颗粒覆盖剂的研制及应用", 《2013年连铸新技术及关键耐材长寿化学术研讨会论文集》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106305440A (en) * | 2016-08-20 | 2017-01-11 | 庄美红 | Production process of bentonite crushed cat litter and manufacturing equipment thereof |
| CN108480579A (en) * | 2018-06-29 | 2018-09-04 | 西峡县西保冶金材料有限公司 | A kind of special low silicon Ultra-low carbon coverture of automobile slab and preparation method thereof |
| CN108480579B (en) * | 2018-06-29 | 2020-01-31 | 西峡县西保冶金材料有限公司 | Low-silicon ultralow-carbon covering agent special for automobile plate steels and preparation method thereof |
| CN110387480A (en) * | 2019-08-21 | 2019-10-29 | 闻喜县凯利达贸易有限公司 | A kind of particle refining agent used for magnesium alloy and preparation method thereof |
| CN110387480B (en) * | 2019-08-21 | 2020-05-22 | 闻喜县凯利达贸易有限公司 | Particle refining agent for magnesium alloy and preparation method thereof |
| CN111659519A (en) * | 2020-06-29 | 2020-09-15 | 江苏沙钢集团有限公司 | KR desulfurizer circulating granulation method |
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|---|---|
| CN103740893B (en) | 2015-09-02 |
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