CN103045805B - Low-cost melted iron heat preservation agent and manufacturing method thereof - Google Patents
Low-cost melted iron heat preservation agent and manufacturing method thereof Download PDFInfo
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- CN103045805B CN103045805B CN201210543783.9A CN201210543783A CN103045805B CN 103045805 B CN103045805 B CN 103045805B CN 201210543783 A CN201210543783 A CN 201210543783A CN 103045805 B CN103045805 B CN 103045805B
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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
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Abstract
On the one hand, the present invention provides a low-cost melted iron heat preservation agent, on the other hand the present invention provides a manufacturing method of the low-cost melted iron heat preservation agent. The melted iron heat preservation agent includes 60-70% of high-carbon fly ash, 25-35% of water quenching blast furnace slag, and 3-5% of fluorite powder, wherein the content of the fixed carbon in the high carbon fly ash is more than 10%. The manufacturing method includes the steps of drying raw materials, burdening, mixing and packing. In the step of drying raw materials, the raw materials are dried to moisture content below 1.0% by weight. The low-cost melted iron heat preservation agent is manufactured by taking the home-grown slag (high carbon fly ash and water quenching blast furnace slag) as a main material and adding a small amount of fluorite, is good in heat preservation effect, can effectively prevent melted iron bottle from bonding the slag, is low in cost, and can significantly reduce the cost of ironmaking.
Description
Technical field
The invention belongs to field of metallurgy, more particularly, relate to the agent of a kind of hot-metal insulating cheaply and manufacture method thereof.
Background technology
General large blast furnace adopts fish tank car to transport molten iron, medium and small blast furnace generally adopts iron ladle to transport molten iron, fish tank car heat insulation effect is good, generally do not need to add separately heat preserving agent, iron ladle is because heat insulation effect is poor, molten iron directly contacts with air, exposes area to the open air larger, generally by adding the mode of heat preserving agent, carries out covering and heat insulating.Certain factory transports molten iron because cause specific adopts iron ladle always, and adding vermiculite or sial is that heat preserving agent is incubated, average 0.5～0.6 ℃/min of temperature drop.
By patent and non-patent literature, analyze, single carbonization rice husk or the vermiculite of main employing used as hot-metal insulating agent in the past, mainly compound heat preserving agent at present, with sial, be main, by adding heat-generating agent if graphite, carbonization rice husk, heat preserving agent are as floated pearl, dissolving agent if fluorite, whipping agent are as sodium carbonate (calcium) etc., in order to reduce costs, the general raw slag material that adopt, as flyash, flue dust etc. more.
As adding self-produced charing wheat husk in 140t iron ladle, wine steel iron work does hot-metal insulating agent.Charing wheat husk is schistose granular.Its salient features is: ash content approximately 50%, fugitive constituent approximately 10%, fixed carbon approximately 40%, wherein ash content main component is Si0
2(containing 68%), unit weight 0.095g/cm
3, thermal conductivity 0.045W/ (mK), the feature of this charing wheat husk is that burning-point is low, and ash content fusing point is high, and free flowability is good.
Iron ladle heat preserving agent before elder brother's steel mainly adopts vermiculite and carbonization rice husk.Due to carbonization rice husk dust from flying contaminate environment, cost is high, and vermiculite heat insulation effect is poor, easily crust.
Liu Gang adopts blast furnace granulated slag to make main raw material, and the compound molten iron heat preserving agent by adding the good expansive rock of power plant's flue dust, amorphous graphite and heat-insulating property to make, take full advantage of blast furnace subsidiary products grain slag and power plant's flue dust, and technique is simple.Owing to having added the additive that can promote mobility in heat preserving agent, thereby it can fully sprawl on molten iron surface, and uniform fold, on molten iron surface, plays good insulation effect.In addition, by the performance of its absorption slag, can with molten iron in slag form the low intensive insulation slag lid of one deck, prevent heat loss.Slag lid is also quite low with periphery iron ladle bonding strength simultaneously, quite easy during scarfing cinder, the damage to iron ladle refractory brick while reducing scarfing cinder, the life-span of having improved molten iron.
Xuan Gang be take plant carbon compound as main, with addition of other material, has developed hot-metal insulating agent, and result of use is better, effectively reduces iron ladle temperature drop and iron loss, has extended the work-ing life of iron ladle.
And the cost of commodity heat preserving agent is higher, bring certain pressure to enterprise's cost efficiency, therefore a kind of low cost and good hot-metal insulating agent and the manufacture method thereof of heat insulation effect need to be provided.
Summary of the invention
For the deficiencies in the prior art, one of object of the present invention is to solve the one or more problems that exist in above-mentioned prior art.
The object of the present invention is to provide hot-metal insulating agent and manufacture method thereof that a kind of low cost and heat insulation effect are good.
To achieve these goals, an aspect of of the present present invention provides the agent of a kind of hot-metal insulating cheaply, by weight percentage, described hot-metal insulating agent comprises 60～70% high-carbon fly ash, 25～35% water-quenched blast-furnace slag and 3～5% Fluorspar Powder, and the fixed carbon content in described high-carbon fly ash is more than 10%.
According to low-cost hot-metal insulating agent of the present invention embodiment, the particle diameter of described high-carbon fly ash is less than 1mm.
According to low-cost hot-metal insulating agent of the present invention embodiment, by weight percentage, the particle diameter of more than 80% described high-carbon fly ash is less than 75 μ m.
According to low-cost hot-metal insulating agent of the present invention embodiment, the particle diameter of described water-quenched blast-furnace slag is 1～5mm.
According to low-cost hot-metal insulating agent of the present invention embodiment, the particle diameter of described Fluorspar Powder is less than 75 μ m, wherein, and CaF
2content be greater than by weight percentage 95%.
According to low-cost hot-metal insulating agent of the present invention embodiment, the add-on of described hot-metal insulating agent is 1～1.5kg/t
molten iron.
Another aspect of the present invention provides a kind of method of manufacturing above-mentioned low-cost hot-metal insulating agent, described method comprises the step of dried feed, batching, batch mixing and the packing of carrying out successively, in the step of described dried feed, by raw material drying to water content by weight percentage lower than 1.0%.
95% of low-cost hot-metal insulating agent of the present invention is comprised of resources such as metallurgical slags, be mainly used in ironmaking technology field, be characterized in that bulk density is low, thermal conductivity is low, fusing point is lower, easy slagging, carry heat-generating agent and can supplement temperature of molten iron etc., many wheel test in places show that this hot-metal insulating agent has good heat insulation effect, what do not affect on-the-spot iron ladle turns over tank and scarfing cinder operation, and can effectively utilize residue resource, energy-conserving and environment-protective.
Embodiment
Hereinafter, in connection with specific embodiment, describe the present invention in detail.Unless otherwise noted, per-cent of the present invention is all weight percentage.
By weight percentage, low-cost according to an exemplary embodiment of the present invention hot-metal insulating agent comprises 60～70% high-carbon fly ash, 25～35% water-quenched blast-furnace slag and 3～5% Fluorspar Powder, and wherein, the fixed carbon content in high-carbon fly ash is more than 10%.High-carbon fly ash is as the main component of hot-metal insulating agent, the advantage that heat-proof quality is good, Slag Properties is good, carbon supplements heating that in use can make full use of flyash; Water-quenched blast-furnace slag adds in hot-metal insulating agent as particulate material, forms the mixture of particulate material and fine powder material, can improve the addition manner of hot-metal insulating agent, spreadability might as well, and due to its light specific gravity, the feature that heat-proof quality is good, can also improve the heat-insulating property of hot-metal insulating agent effectively.If the add-on of high-carbon fly ash or water-quenched blast-furnace slag is very little, do not have effect, if but add-on is too much, can change the Slag Properties of hot-metal insulating agent, be unfavorable for slagging, and spreadability is also poor.It is molten fast that Fluorspar Powder mainly works to adjust hot-metal insulating agent fusing point, make the change slag of hot-metal insulating agent respond well, its content is slag DeGrain lower than 3% time, and manufacturing cost is higher and heat preserving agent fusing point is lower higher than 5% time, does not meet the requirement of hot-metal insulating agent.
According to the present invention, high-carbon fly ash refers to that the fixed carbon content of electricity generation boiler generation is at more than 10% flyash, and high-carbon fly ash also contains just like compositions such as sial systems; Water-quenched blast-furnace slag is the light granules shape slag sand that blast furnace slag produces after shrend chilling, and main component is sial system; Fluorspar Powder can be by commercially available acquisition.Wherein, in high-carbon fly ash, contain unburnt fixed carbon and float in a large number pearl, mainly play spontaneous heating and insulation effect; Water-quenched blast-furnace slag has coordinated insulation effect with high-carbon fly ash; Fluorspar Powder is plaing a part slag and adjusting heat preserving agent fusing point mainly.
According to the present invention, the particle diameter of high-carbon fly ash is less than 1mm, and the particle diameter of water-quenched blast-furnace slag is 1～5mm, and the particle diameter of Fluorspar Powder is less than 75 μ m, wherein, and CaF
2content be greater than 95%.Preferably, the particle diameter of more than 80% described high-carbon fly ash is less than 75 μ m.Less raw material particle size is conducive to the homogeneity of raw material mixing and can guarantees that heat preserving agent contacts fully with molten iron, is conducive to improve the heat insulation effect of hot-metal insulating agent.
While using low-cost hot-metal insulating agent of the present invention, suggestion starts to add when iron ladle half tank molten iron, until add during molten iron canful, Fibre Bag packing is used in hot-metal insulating agent, during interpolation, directly Fibre Bag is added in iron ladle to reduce airborne dust, Fibre Bag heat is decomposed, and internal insulation agent spreads over molten iron surface effectively, plays good insulation effect.Generally speaking, the add-on of above-mentioned hot-metal insulating agent is 1～1.5kg/t
molten iron.
Another aspect of the present invention provides a kind of manufacture method of above-mentioned low-cost hot-metal insulating agent, described manufacture method comprises the step of dried feed, batching, batch mixing and the packing of carrying out successively, in the step of described dried feed, by raw material drying to water content by weight percentage lower than 1.0%.Particularly, satisfactory high-carbon fly ash, water-quenched blast-furnace slag, Fluorspar Powder are carried out to drying treatment, control water content lower than 1.0%, then will after three kinds of feed proportionings, by blending device, mix, adopt fiber woven bags to carry out quantitative package, can obtain low-cost hot-metal insulating agent product of the present invention.
In order to understand better the present invention, below in conjunction with concrete example, further illustrate the present invention.
According to the proportioning shown in table 1, according to the proportioning of Fluorspar Powder be 5%, the proportioning of high-carbon fly ash be 60%, 65%, 70% and the water-quenched blast-furnace slag of surplus make three groups of hot-metal insulating agent, correspond to respectively example 1 to example 3,4 in table is commodity heat preserving agent.Above four groups of hot-metal insulating agent have been carried out to the performance test of bulk density, thermal conductivity and hot metal temperature drop, result shows, the bulk density of low-cost hot-metal insulating agent of the present invention, thermal conductivity all meet the requirement of hot-metal insulating agent, can effectively slow down 0.06～0.07 ℃/min of iron ladle temperature drop, heat insulation effect is remarkable.
The composition proportion table of table 1 example 1～3
In sum, low-cost hot-metal insulating agent of the present invention adopts self-produced waste residue (high-carbon fly ash, water-quenched blast-furnace slag) for main raw material and adds a small amount of fluorite and is mixed, heat insulation effect is better, can effectively prevent iron ladle dry slag, with low cost and can significantly reduce ironmaking cost.
The invention is not restricted to above-described embodiment, in the situation that not departing from protection domain of the present invention, can carry out various changes and modifications.
Claims (4)
1. a hot-metal insulating agent cheaply, it is characterized in that, by weight percentage, described hot-metal insulating agent comprises 60～70% high-carbon fly ash, 25～35% water-quenched blast-furnace slag and 3～5% Fluorspar Powder, fixed carbon content in described high-carbon fly ash is more than 10%, the particle diameter of described high-carbon fly ash is less than 1mm, and the particle diameter of described water-quenched blast-furnace slag is 1～5mm.
2. low-cost hot-metal insulating agent according to claim 1, is characterized in that, by weight percentage, the particle diameter of more than 80% described high-carbon fly ash is less than 75 μ m.
3. low-cost hot-metal insulating agent according to claim 1, is characterized in that, the particle diameter of described Fluorspar Powder is less than 75 μ m, wherein, and CaF
2content be greater than by weight percentage 95%.
4. the manufacture method of low-cost hot-metal insulating agent as claimed any one in claims 1 to 3, it is characterized in that, described method comprises the step of dried feed, batching, batch mixing and the packing of carrying out successively, in the step of described dried feed, by raw material drying to water content by weight percentage lower than 1.0%.
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| CN201210543783.9A CN103045805B (en) | 2012-12-14 | 2012-12-14 | Low-cost melted iron heat preservation agent and manufacturing method thereof |
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| CN201210543783.9A CN103045805B (en) | 2012-12-14 | 2012-12-14 | Low-cost melted iron heat preservation agent and manufacturing method thereof |
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| CN103045805A CN103045805A (en) | 2013-04-17 |
| CN103045805B true CN103045805B (en) | 2014-08-06 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103537636B (en) * | 2013-10-29 | 2016-01-20 | 新疆华莎能源股份有限公司 | There is the steel of sulfur phosphorus eliminating function, molten iron slag gathering heat insulating covering agent |
| CN103627852B (en) * | 2013-11-29 | 2016-06-08 | 攀钢集团研究院有限公司 | Hot-metal insulating agent and the smelting process containing sefstromite |
| CN107574284A (en) * | 2017-08-25 | 2018-01-12 | 鞍钢股份有限公司 | It is a kind of using metallurgical waste as the hot-metal insulating agent of raw material and its manufacture, application method |
| CN108503376B (en) * | 2018-03-15 | 2021-01-26 | 马鞍山钢铁股份有限公司 | Slag adhesion preventing material for slag tank and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1063432A (en) * | 1991-01-26 | 1992-08-12 | 黄胜利 | Heat preserving agent for liquid steel |
| CN1844015A (en) * | 2006-04-29 | 2006-10-11 | 刘万友 | Composition for manufacturing building block and method thereof |
| CN102191355A (en) * | 2011-04-07 | 2011-09-21 | 攀钢集团有限公司 | Covering agent for steel smelting, and preparation method thereof |
| CN102814472A (en) * | 2012-07-31 | 2012-12-12 | 马鞍山科润冶金材料有限公司 | Casting powder for casting round ingots and manufacture method of casting powder |
-
2012
- 2012-12-14 CN CN201210543783.9A patent/CN103045805B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1063432A (en) * | 1991-01-26 | 1992-08-12 | 黄胜利 | Heat preserving agent for liquid steel |
| CN1844015A (en) * | 2006-04-29 | 2006-10-11 | 刘万友 | Composition for manufacturing building block and method thereof |
| CN102191355A (en) * | 2011-04-07 | 2011-09-21 | 攀钢集团有限公司 | Covering agent for steel smelting, and preparation method thereof |
| CN102814472A (en) * | 2012-07-31 | 2012-12-12 | 马鞍山科润冶金材料有限公司 | Casting powder for casting round ingots and manufacture method of casting powder |
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| CN103045805A (en) | 2013-04-17 |
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