CN107552746A - A kind of heat preserving agent for liquid steel and its insulation oxidant layer - Google Patents
A kind of heat preserving agent for liquid steel and its insulation oxidant layer Download PDFInfo
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- CN107552746A CN107552746A CN201710768324.3A CN201710768324A CN107552746A CN 107552746 A CN107552746 A CN 107552746A CN 201710768324 A CN201710768324 A CN 201710768324A CN 107552746 A CN107552746 A CN 107552746A
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Abstract
The invention discloses a kind of heat preserving agent for liquid steel, belongs to heat preserving agent field, and heat preserving agent for liquid steel includes the component of following mass fraction：Carbonization rice husk ash content：70~100 parts；Carbon source：1~10 part；Silicon source：1~30 part；The carbonization rice husk ash content includes the element of following mass percent：C：2~17%；Si：40~60%；Surplus：H、O、S、Ca、Fe、P；The moisture content of the carbonization rice husk ash content is less than the 3% of the heat preserving agent gross mass；0.18~0.35g/cm3 of heap density of the heat preserving agent for liquid steel.Heat preserving agent for liquid steel provided by the invention, relative to the carbonization rice husk with alveolate texture, molten steel surface temperature drop highest can be by 1.56 DEG C of min‑1It is down to 0.78 DEG C of min‑1.Heat preserving agent for liquid steel provided by the invention, thermal conductivity factor is low, and high insulating effect, spreading property is excellent, does not lump, and production cost is low.
Description
Technical field
The present invention relates to heat preserving agent field, more particularly to a kind of heat preserving agent for liquid steel and its insulation oxidant layer.
Background technology
During blast furnace ironmaking, molten steel is transported into steelmaking converter from blast furnace, but often blast furnace and refining
Transportation range between steel converter is remote, stand-by period length, and the temperature drop of molten steel is frequently necessary to add in molten steel and protected than very fast
Warm agent is incubated to molten steel.In recent years, with the gradual increase of production scale and ability, the progress of production technology, steel
The capacity of bag gradually increases, and steel liquid residence time in bag will extend.It is a large amount of to use to meet follow-up technological requirement
Heat preserving agent, the temperature and quality of steel liquid in bag are kept, has become major issue.
The heat preserving agent of molten steel is mainly carbonization rice husk used at present, and its fixation carbon content is higher, is only used for high-carbon
The heat preserving agent of steel, use range is narrow, sprawls that effect is bad, and heat insulation effect also has much room for improvement.
The content of the invention
The defects of in order to overcome prior art, the technical problems to be solved by the invention are to propose a kind of heat preserving agent for liquid steel
And its insulation oxidant layer, it disclosure satisfy that production cost is low, high insulating effect, glues less wait of iron and requires.
To use following technical scheme up to this purpose, the present invention：
The invention provides a kind of heat preserving agent for liquid steel, include the component of following mass fraction：Carbonization rice husk ash content：70~
100 parts；Carbon source：1~10 part；Silicon source：1~30 part；The carbonization rice husk ash content includes the element of following mass percent：C：2
~17%；Si：40~60%；Surplus：H、O、S、Ca、Fe、P；It is total that the moisture content of the carbonization rice husk ash content is less than the heat preserving agent
The 3% of quality；0.18~0.35g/cm of heap density of the heat preserving agent for liquid steel3。
In preferably technical scheme of the invention, the carbon source includes one or both of coke blacking, graphite powder；It is described
Carbon source average grain diameter is no more than 100nm, and particle size range is more than 90% between 90~100nm；The quality of the carbon source and carbon
Percentage is more than 85%.
In preferably technical scheme of the invention, the silicon source is included in dirt perlite, flyash, diatomite, vermiculite
One or more；The carbon source average grain diameter is no more than 100nm, and particle size range is more than 85% between 90~100nm；
The mass percent of the silicon source silicon is more than 92%.
In preferably technical scheme of the invention, the thickness of sprawling of the heat preserving agent for liquid steel is 2~5cm.
In preferably technical scheme of the invention, including the outer layer S1 that heat preserving agent for liquid steel described in claim 1 is formed
Layer, in addition to internal layer S2 layers, the S2 layers include the component of following mass fraction：SiO2：40~60 parts；MgO：15~20 parts；
CaO：30~50 parts；Al2O3：15~20 parts；Y2O3：1~5 part；Cr2O3：1~5 part；Bonding agent：0.5~1 part；Foaming agent：0.5
~1 part.
In preferably technical scheme of the invention, the S2 layers average grain diameter is less than 1mm；The heap density of the S2 layers is
0.35~0.55g/cm3。
In preferably technical scheme of the invention, the bonding agent is carboxymethyl cellulose or sodium carboxymethylcellulose.
In preferably technical scheme of the invention, the foaming agent is in sodium abietate, calcium carbide, bicarbonate, syrup
It is one or two kinds of；When foaming agent is two kinds of materials, the quality of each material is equal.
In preferably technical scheme of the invention, the thickness of sprawling of the S2 layers is 1~2cm.
Beneficial effects of the present invention are：
Carbonization rice husk ash content is used in heat preserving agent for liquid steel provided by the invention, relative to the carbon with alveolate texture
Change rice husk, molten steel surface temperature drop rate reduces, and highest can be by 1.56 DEG C of min-1It is down to 0.78 DEG C of min-1。
Heat preserving agent for liquid steel provided by the invention, thermal conductivity factor is low, and high insulating effect, spreading property is excellent, does not lump, and is produced into
This is low.
Embodiment
Technical scheme is further illustrated below by embodiment.
Embodiment 1
The invention provides a kind of heat preserving agent for liquid steel, include the component of following mass fraction：Carbonization rice husk ash content：70 parts；
Carbon source (coke blacking)：10 parts；Silicon source (dirt perlite)：1 part；The carbonization rice husk ash content includes the member of following mass percent
Element：C：2%；Si：60%；Surplus 38%：H、O、S、Ca、Fe、P；The moisture content of the carbonization rice husk ash content is that the heat preserving agent is total
The 0.7% of quality；The heap density 0.35g/cm of the S1 layers3。
The carbon source average grain diameter is no more than 100nm, and particle size range between 90~100nm for 90%；The carbon
The mass percent of source carbon is 87.15%.The carbon source average grain diameter is no more than 100nm, and particle size range 90~100nm it
Between for 85%；The mass percent of the silicon source silicon is 92.05%.Carbon source and nitrogen source use the powder of Nano grade, and
And most particle diameter can so make better heat preservation close to 100nm.
While heat insulation effect is not only ensured but also in the case of avoiding waste, the thickness of sprawling of the S1 layers is 2cm.
Embodiment 2
The invention provides a kind of heat preserving agent for liquid steel, include the component of following mass fraction：Carbonization rice husk ash content：85 parts；
Carbon source (coke blacking, graphite powder)：5 parts；Silicon source (dirt perlite, flyash)：15 parts；The carbonization rice husk ash content includes as follows
The element of mass percent：C：10%；Si：50%；Surplus 40%：H、O、S、Ca、Fe、P；The moisture content of the carbonization rice husk ash content
For the 1.7% of the heat preserving agent gross mass；The heap density 0.20g/cm of the S1 layers3。
The carbon source average grain diameter is no more than 100nm, and particle size range between 90~100nm for 90%；The carbon
The mass percent of source carbon is 87.15%.The carbon source average grain diameter is no more than 100nm, and particle size range 90~100nm it
Between for 85%；The mass percent of the silicon source silicon is 92%.
The thickness of sprawling of the S1 layers is 3cm.
Embodiment 3
The invention provides a kind of heat preserving agent for liquid steel, include the component of following mass fraction：Carbonization rice husk ash content：100 parts；
Carbon source (graphite powder)：1 part；Silicon source (dirt perlite, flyash, diatomite)：30 parts；The carbonization rice husk ash content includes as follows
The element of mass percent：C：17%；Si：40%；Surplus 43%：H、O、S、Ca、Fe、P；The moisture content of the carbonization rice husk ash content
For the 3% of the heat preserving agent gross mass；The heap density 0.18g/cm of the S1 layers3。
The carbon source average grain diameter is no more than 100nm, and particle size range between 90~100nm for 95%；The carbon
The mass percent of source carbon is 85%.The carbon source average grain diameter is no more than 100nm, and particle size range is between 90~100nm
For 85%；The mass percent of the silicon source silicon is 96%.
The thickness of sprawling of the S1 layers is 5cm.
Embodiment 4
The invention provides a kind of molten steel insulation oxidant layer, outer layer S1 layers include the component of following mass fraction：Carbonization rice husk
Ash content：70 parts；Carbon source (coke blacking)：10 parts；Silicon source (dirt perlite)：1 part；The carbonization rice husk ash content includes following quality
The element of percentage：C：2%；Si：60%；Surplus 38%：H、O、S、Ca、Fe、P；The moisture content of the carbonization rice husk ash content is institute
State the 0.7% of heat preserving agent gross mass；The heap density 0.35g/cm of the S1 layers3。
The carbon source average grain diameter is no more than 100nm, and particle size range between 90~100nm for 90%；The carbon
The mass percent of source carbon is 87.15%.The carbon source average grain diameter is no more than 100nm, and particle size range 90~100nm it
Between for 85%；The mass percent of the silicon source silicon is 92.05%.Carbon source and nitrogen source use the powder of Nano grade, and
And most particle diameter can so make better heat preservation close to 100nm.
Internal layer S2 layers include the component of following mass fraction：SiO2：40 parts；MgO：15 parts；CaO：30 parts；Al2O3：15 parts；
Y2O3：1 part；Cr2O3：1 part；Bonding agent (carboxymethyl cellulose)：0.5 part；Foaming agent (sodium abietate)：0.5 part.Due to S2 layers
It is hardly carbon containing, so the insulation of mild steel or ultra-low-carbon steel is particularly suited for, and heat insulation effect is relatively good.
In order to keep good heat insulation effect, the S2 layers average grain diameter is less than 1mm；The heap density of the S2 layers is
0.35g/cm3。
While heat insulation effect is not only ensured but also in the case of avoiding waste, the thickness of sprawling of the S1 layers is 2cm；It is described
The thickness of sprawling of S2 layers is 1cm.
Embodiment 5
The invention provides a kind of heat preserving agent for liquid steel, outer layer S1 layers include the component of following mass fraction：Carbonization rice husk ash
Point：70 parts；Carbon source (coke blacking)：10 parts；Silicon source (dirt perlite)：1 part；The carbonization rice husk ash content includes following quality hundred
The element of fraction：C：2%；Si：60%；Surplus 38%：H、O、S、Ca、Fe、P；The moisture content of the carbonization rice husk ash content is described
The 0.7% of heat preserving agent gross mass；The heap density 0.25g/cm of the S1 layers3。
The carbon source average grain diameter is no more than 100nm, and particle size range between 90~100nm for 90%；The carbon
The mass percent of source carbon is 87.15%.The carbon source average grain diameter is no more than 100nm, and particle size range 90~100nm it
Between for 85%；The mass percent of the silicon source silicon is 92.05%.Carbon source and nitrogen source use the powder of Nano grade, and
And most particle diameter can so make better heat preservation close to 100nm.
Internal layer S2 layers include the component of following mass fraction：SiO2：50 parts；MgO：17 parts；CaO：40 parts；Al2O3：17 parts；
Y2O3：3 parts；Cr2O3：3 parts；Bonding agent (sodium carboxymethylcellulose)：0.7 part；Foaming agent (calcium carbide, bicarbonate)：0.7 part.
In preferably technical scheme of the invention, the S2 layers average grain diameter is less than 1mm；The heap density of the S2 layers is
0.45g/cm3。
While heat insulation effect is not only ensured but also in the case of avoiding waste, the thickness of sprawling of the S1 layers is 2cm；It is described
The thickness of sprawling of S2 layers is 1.5cm.
Embodiment 6
The invention provides a kind of heat preserving agent for liquid steel, outer layer S1 layers include the component of following mass fraction：Carbonization rice husk ash
Point：70 parts；Carbon source (coke blacking)：10 parts；Silicon source (dirt perlite)：1 part；The carbonization rice husk ash content includes following quality hundred
The element of fraction：C：2%；Si：60%；Surplus 38%：H、O、S、Ca、Fe、P；The moisture content of the carbonization rice husk ash content is described
The 0.7% of heat preserving agent gross mass；The heap density 0.18g/cm of the S1 layers3。
The carbon source average grain diameter is no more than 100nm, and particle size range between 90~100nm for 90%；The carbon
The mass percent of source carbon is 87.15%.The carbon source average grain diameter is no more than 100nm, and particle size range 90~100nm it
Between for 85%；The mass percent of the silicon source silicon is 92.05%.Carbon source and nitrogen source use the powder of Nano grade, and
And most particle diameter can so make better heat preservation close to 100nm.
While heat insulation effect is not only ensured but also in the case of avoiding waste, the thickness of sprawling of the S1 layers is 2cm.
Internal layer S2 layers include the component of following mass fraction：SiO2：60 parts；MgO：20 parts；CaO：50 parts；Al2O3：20 parts；
Y2O3：5 parts；Cr2O3：5 parts；Bonding agent (carboxymethyl cellulose)：1 part；Foaming agent (calcium carbide, syrup)：1 part.
In preferably technical scheme of the invention, the S2 layers average grain diameter is less than 1mm；The heap density of the S2 layers is
0.55g/cm3；The thickness of sprawling of the S2 layers is 1~2cm.
Comparative example：Main component is carbonization rice husk, heap density and to sprawl thickness same as Example 1.
Example 1 to 6 carries out molten steel surface temperature drop test, test result with heat preserving agent made from comparative example respectively
It is as shown in the table：
As seen from table, heat preserving agent made from embodiment 1 to 6 is relative to its molten steel table of the heat preserving agent made from comparative example
Face temperature drop highest can be by 1.56 DEG C of min-1It is down to 0.78 DEG C of min-1.Also, the heat preserving agent master used due to comparative example
To be carbonization rice husk, the content of its fixed carbon is comparatively higher, the insulation for the molten steel being not particularly suited in addition to high-carbon steel.
The present invention is described with reference to the preferred embodiments, and those skilled in the art know, is not departing from the present invention's
In the case of spirit and scope, various changes or equivalence replacement can be carried out to these features and embodiment.The present invention is not by this
The limitation of specific embodiment disclosed in place, other embodiments fallen into claims hereof belong to protection of the present invention
Scope.
Claims (9)
1. a kind of heat preserving agent for liquid steel, it is characterised in that include the component of following mass fraction：
Carbonization rice husk ash content：70~100 parts；Carbon source：1~10 part；Silicon source：1~30 part；The carbonization rice husk ash content includes as follows
The element of mass percent：C：2~17%；Si：40~60%；Surplus：H、O、S、Ca、Fe、P；The carbonization rice husk ash content
Moisture content is less than the 3% of the heat preserving agent gross mass；0.18~0.35g/cm of heap density of the heat preserving agent for liquid steel3。
2. heat preserving agent for liquid steel according to claim 1, it is characterised in that：
The carbon source includes one or both of coke blacking, graphite powder；
The carbon source average grain diameter is no more than 100nm, and particle size range is more than 90% between 90~100nm；
The mass percent of the carbon source and carbon is more than 85%.
3. heat preserving agent for liquid steel according to claim 1, it is characterised in that：
The silicon source includes the one or more in dirt perlite, flyash, diatomite, vermiculite；
The carbon source average grain diameter is no more than 100nm, and particle size range is more than 85% between 90~100nm；
The mass percent of the silicon source silicon is more than 92%.
4. heat preserving agent for liquid steel according to claim 1, it is characterised in that：
The thickness of sprawling of the heat preserving agent for liquid steel is 2~5cm.
A kind of 5. molten steel insulation oxidant layer, it is characterised in that the outer layer S1 formed including the heat preserving agent for liquid steel described in claim 1
Layer, in addition to internal layer S2 layers, the S2 layers include the component of following mass fraction：SiO2：40~60 parts；MgO：15~20 parts；
CaO：30~50 parts；Al2O3：15~20 parts；CaF2：5~10 parts；Y2O3：1~5 part；Cr2O3：1~5 part；Bonding agent：0.5~1
Part；Foaming agent：0.5~1 part.
6. heat preserving agent for liquid steel according to claim 5, it is characterised in that：
The S2 layers average grain diameter is less than 1mm；
The heap density of the S2 layers is 0.35~0.55g/cm3。
7. heat preserving agent for liquid steel according to claim 5, it is characterised in that：
The bonding agent is carboxymethyl cellulose or sodium carboxymethylcellulose.
8. heat preserving agent for liquid steel according to claim 5, it is characterised in that：
The foaming agent is one or two kinds of in sodium abietate, calcium carbide, bicarbonate, syrup；When foaming agent is two kinds of materials
When, the quality of each material is equal.
9. heat preserving agent for liquid steel according to claim 5, it is characterised in that：
The thickness of sprawling of the S2 layers is 1~2cm.
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| CN110578030A (en) * | 2019-08-29 | 2019-12-17 | 内蒙古赛思普科技有限公司 | Desulfurization method of low-phosphorus low-silicon molten iron |
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| CN107552746B (en) | 2020-04-07 |
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