CN103740893B - High alkalinity composite particles insulating covering agent and production method thereof - Google Patents

High alkalinity composite particles insulating covering agent and production method thereof Download PDF

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Publication number
CN103740893B
CN103740893B CN201410006501.0A CN201410006501A CN103740893B CN 103740893 B CN103740893 B CN 103740893B CN 201410006501 A CN201410006501 A CN 201410006501A CN 103740893 B CN103740893 B CN 103740893B
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covering agent
insulating covering
composite particles
high alkalinity
granulation
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CN103740893A (en
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程立
康彦萍
蔡书云
高晓梅
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Taiyuan Iron and Steel Group Co Ltd
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Taiyuan Iron and Steel Group Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/20Recycling

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Abstract

The present invention discloses a kind of high alkalinity composite particles insulating covering agent, it is characterized in that: the raw material comprising following component: carbonization stalk 59.5% ~ 70%, lime 29.5 ~ 40%, binding agent CMC(carboxymethyl cellulose) 0.5%.Present invention also offers the production method of this insulating covering agent: desired raw material is pulverized grinding in proportion, the material mixed is squeezed into the finished product of 0.2mm ~ 4mm granularity by granulating equipment.The high alkalinity composite particles insulating covering agent carbon content < 0.5% that the method is produced, R (basicity) > 1.2, production technique is simple, cost is low, for ladle and Metal in Tundish insulation, molten steel not carburetting can be ensured, and environmentally friendly, be particluarly suitable for using as ladle covering agent in the smelting of low-carbon (LC) and ultra low-carbon steel.

Description

High alkalinity composite particles insulating covering agent and production method thereof
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 the subsidiary material joining in ladle a kind of synthetic covering molten steel surface in smelting molten steel process.It has following functions:
(1) adiabatic heat-insulation, prevent molten steel face from crusting.Insulating covering agent has significant adiabatic heat-insulation effect.Insulating covering agent covers molten steel surface, prevents the exposed liquid steel temperature that causes in atmosphere of molten steel from declining rapidly, thus causes that liquid level crusts, the mouth of a river freezes;
(2) completely cut off air, prevent secondary oxidation of steel.After insulating covering agent adds, form the liquid slag layer of poor air permeability, molten steel and air exclusion are opened, prevents the secondary oxidation of molten steel, decrease the inclusion of molten steel;
(3) non-metallic inclusion on molten steel face is absorbed, purify hot metal.Insulating covering agent forms certain thickness molten slag layer at molten steel surface, can adsorb the seston such as non-metallic inclusion, fire resisting material particle floating to molten steel surface, play the effect of purify hot metal.
What current most of steel mill, most of steel grade used mostly is ordinary steel covering agent, and this type of ladle covering agent is acid, 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, it is possible to the alkaline covering agent of purify hot metal is developed thereupon, but 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 element that must control in Clean Steel production process, the general carbonaceous material that all content is a large amount of 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.Effectively will prevent the carburetting of molten steel in ladle, then preferably use the ladle covering agent of carbon-free or micro-carbon, this just requires that the content of carbonaceous material in ladle covering agent is 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 difference and carbon content is high, the present invention aims to provide the ultralow high alkalinity composite particles insulating covering agent of a kind of high insulating effect, carbon content, product result of use is good, molten steel calorific loss can be reduced, again can purify hot metal, also can not cause molten steel recarburization simultaneously, and environmentally friendly.Present invention also offers 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 comprising 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 DEG C;
Molten speed >=60s;
Unit weight: 0.5 ~ 0.8.
Present invention also offers a kind of production method of high alkalinity composite particles insulating covering agent, it is characterized in that: desired raw material is pulverized grinding in proportion, it is 0.2mm ~ 4mm that the material mixed 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 grinding
Carbonization stalk and lime being crushed to after 1mm through composite crusher and sending into 4R grinding machine through electroshock feeding machine again, is below 100 orders through 4R grinding machine abrasive dust to granularity;
(2) batch mixing
Material after grinding sends into mixer through measuring belt, adds binding agent, after material mixing, enters intermediate bin through chapelet;
(3) roll-in
Material sends into roll squeezer by forced feed machine, 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 made up 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 is by the running of belt drive double output shaft hard-tooth surface speed reducer, and it is connected with roll squeezer roll by shaft coupling, when step-down gear running is also with transmission roller press roll to do extruding work simultaneously.
In described nipping process, pressure is 14MPa, is pressed into the strip-shaped materials of 100*10*5mm.
(4) broken, granulation
The fragment that crushed machine is broken into 4mm is dropped under strip-shaped materials nature; the nearly spherical particles of 4mm is formed again through tablets press; 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 and many broken for rotating cylinder cutter and the aperture 0.2 ~ 4mm screen cloth of grinding is formed; main shaft is driven to do screen cloth granulation, granulation rotating speed: 150 ~ 250rpm by 7.5kW motor ~ belt pulley.
(5) sieve
Finally by screening, the salable product material of 0.2 ~ 4mm granularity enters finished bin, and the material being greater than 4mm turns back in crushed machine, be less than the material of 0.2mm turns back in intermediate bin, re-starts granulation.
Both required not carbon containing for product of the present invention, and required again the target that heat insulation effect is good, the carbonization stalk after carbon elimination calcined by raw material of the present invention under adopting the lime of 29.5 ~ 40% and 59.5% ~ 70% high temperature.The stalk of high-temperature calcination and the use of lime can the high alkalinities of ensuring coverage agent, thus are conducive to purify hot metal; Stalk after high-temperature calcination carbon elimination contains few carbon, can ensure to cause molten steel recarburization; Meanwhile, the minimizing of carbon content does not affect the heat insulation effect of insulating covering agent, and this is determined by the microtexture of carbonization stalk very advantageous.On the one hand, carbonization stalk porous, cellular microtexture effectively can 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, thus non-fusible, serves 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 DEG C, has good mobility and spreadability, can sprawl at molten steel surface 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, achieves the requirement of C content < 0.5%, R (basicity) > 1.2.
High alkalinity composite particles insulating covering agent provided by the invention and production method thereof, the beneficial effect brought:
(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, will, to molten steel recarburization, molten steel composition is guaranteed, be particluarly suitable for using as ladle covering agent 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 a lot of steel mill uses at present is powdery, and the present invention is owing to employing extruding granulation equipment, and make product be particulate state, when particle insulating covering agent uses 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 except 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, pile up problem to solve stalk in field, a large amount of stalk, by open incineration, produces serious environmental pollution, and causes certain potential safety hazard.The present invention take agricultural crop straw as the high value advantageous property that particle insulating covering agent product that main raw material is developed not only make use of stalk at low cost, and protects 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 grinding: 59.5kg carbonization stalk and 40kg lime be crushed to after 1mm through composite crusher and send into 4R grinding machine through electroshock feeding machine again, be below 100 orders by mixture abrasive dust to granularity in 4R grinding machine.
(2) batch mixing: the material mixed is sent into mixer through measuring belt, adds binding agent, after material mixing, enters 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 nipping 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 made up 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 is by the running of belt drive double output shaft hard-tooth surface speed reducer, and it is connected with tablets press roll by shaft coupling, when step-down gear running also drives tablets press roll to do extruder grain work simultaneously.
(4) broken, granulation: drop into the fragment that crushed machine is broken into 4mm under strip-shaped materials nature; the nearly spherical particles of 4mm is formed again through tablets press; 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 and many broken for rotating cylinder cutter and the aperture 0.2 ~ 4mm screen cloth of grinding is formed; drive main shaft to do screen cloth granulation by 7.5kW motor ~ belt pulley, granulation rotating speed is 150 ~ 180rpm.
(5) sieve
Finally by screening, the salable product material of 0.2 ~ 4mm granularity enters finished bin, and the material being greater than 4mm turns back in crushed machine, be less than the material of 0.2mm turns back in intermediate bin, re-starts granulation.
Laboratory EDTA volumetry surveys aluminium, calcium, magnesium; Silicon is surveyed 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) desired raw material is pulverized grinding: 70kg carbonization stalk and 29.5kg lime be crushed to after 1mm through composite crusher and send into 4R grinding machine through electroshock feeding machine again, by below mixture abrasive dust to 100 order in 4R grinding machine.
(2) batch mixing: the material mixed is sent into mixer through measuring belt, adds binding agent, after material mixing, enters 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 nipping process, pressure is 14MPa, is pressed into the strip-shaped materials of 100*10*5mm.
(4) broken, granulation: drop into the fragment that crushed machine is broken into 4mm under strip-shaped materials nature; the nearly spherical particles of 4mm is formed again through tablets press; 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) sieve: finally by screening, the salable product material of 0.2 ~ 4mm granularity enters finished bin, the material being greater than 4mm turns back in crushed machine, be less than the material of 0.2mm and turn back in intermediate bin, re-start granulation.
Laboratory is tested according to EDTA volumetry survey aluminium, calcium, magnesium, surveys silicon, test carbon carbon sulphur instrument by weighting method, measures, record particular product performance parameters as follows with melting point apparatus to fusing point, molten speed:
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) desired raw material is pulverized grinding: 64.75kg carbonization stalk and 34.75kg lime be crushed to after 1mm through composite crusher and send into 4R grinding machine through electroshock feeding machine again, by below mixture abrasive dust to 100 order in 4R grinding machine.
(2) batch mixing: the material mixed is sent into mixer through measuring belt, adds binding agent, after material mixing, enters 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 nipping process, pressure is 14MPa, is pressed into the strip-shaped materials of 100*10*5mm.
(4) broken, granulation: drop into the fragment that crushed machine is broken into 4mm under strip-shaped materials nature; the nearly spherical particles of 4mm is formed again through tablets press; 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) sieve: finally by screening, the salable product material of 0.2 ~ 4mm granularity enters finished bin, the material being greater than 4mm turns back in crushed machine, be less than the material of 0.2mm and turn back in intermediate bin, re-start granulation.
Laboratory is tested according to EDTA volumetry survey aluminium, calcium, magnesium, surveys silicon, test carbon carbon sulphur instrument by weighting method, measures, record particular product performance parameters as follows with melting point apparatus to fusing point, molten speed:

Claims (3)

1. a production method for high alkalinity composite particles insulating covering agent, high alkalinity composite particles insulating covering agent comprises the raw material of following component:
Carbonization stalk 59.5% ~ 70%,
Lime 29.5 ~ 40%,
Binding agent 0.5%;
Described binding agent is CMC carboxymethyl cellulose;
It is characterized in that:
Desired raw material is pulverized grinding in proportion, the material mixed is squeezed into through granulating equipment the finished product that granularity is 0.2mm ~ 4mm, basicity R > 1.2 again, specifically comprises the following steps:
(1) desired raw material is pulverized grinding;
Carbonization stalk and lime being crushed to after 1mm through composite crusher and sending into 4R grinding machine through electroshock feeding machine again, is below 100 orders through 4R grinding machine abrasive dust to granularity;
(2) batch mixing
Material after grinding sends into mixer through measuring belt, adds binding agent, after material mixing, enters intermediate bin through chapelet;
(3) roll-in
Material sends into roll squeezer by forced feed machine, pulverulent material is pressed into strip or cylindric block of material;
(4) broken, granulation
Drop into the fragment that crushed machine is broken into 4mm under strip-shaped materials nature, then form the spherical particles of 4mm through tablets press,
In described fragmentation, granulation process, broken rotating speed is 750 ~ 900rpm, and the mesh size in tablets press is 0.2 ~ 4mm, and granulation rotating speed is 150 ~ 250rpm;
(5) sieve
Finally by screening, the salable product material of 0.2 ~ 4mm granularity enters finished bin, and the material being greater than 4mm turns back in crushed machine, be less than the material of 0.2mm turns back in intermediate bin, re-starts granulation.
2. the production method of 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 DEG C;
Molten speed >=60s;
Unit weight: 0.5 ~ 0.8.
3. the production method of high alkalinity composite particles insulating covering agent according to claim 1, it is characterized in that: in described nipping process, pressure is 14MPa, is pressed into the strip-shaped materials of 100*10*5mm.
CN201410006501.0A 2014-01-07 2014-01-07 High alkalinity composite particles insulating covering agent and production method thereof Active CN103740893B (en)

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CN106305440A (en) * 2016-08-20 2017-01-11 庄美红 Production process of bentonite crushed cat litter and manufacturing equipment 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
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

Citations (1)

* Cited by examiner, † Cited by third party
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

Patent Citations (1)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
Title
新型微碳碱性颗粒覆盖剂的研制及应用;康彦萍等;《2013年连铸新技术及关键耐材长寿化学术研讨会论文集》;20131231;158-162 *

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