CN104313212B - Molten iron heat preservation agent, preparation method of molten iron heat preservation agent and method for preserving temperature of molten iron - Google Patents
Molten iron heat preservation agent, preparation method of molten iron heat preservation agent and method for preserving temperature of molten iron Download PDFInfo
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- CN104313212B CN104313212B CN201410508226.2A CN201410508226A CN104313212B CN 104313212 B CN104313212 B CN 104313212B CN 201410508226 A CN201410508226 A CN 201410508226A CN 104313212 B CN104313212 B CN 104313212B
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- molten iron
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- metal insulating
- heat preservation
- insulating agent
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Abstract
The invention provide a molten iron heat preservation agent comprising the following components by weight percent: 55-80% of carbonised rice husk, 10-35% of coal ash and 5-20% of pearl sand. The molten iron heat preservation agent provided by the invention has low melting point and good spreadability. The molten iron heat preservation agent is not easy to reunite on the surface of molten iron after being added into the molten iron, and then the temperature drop of the molten iron is effectively reduced and the heat preservation performance of the molten iron heat preservation agent is improved. In addition, by utilizing the molten iron heat preservation agent provided by the invention, consumption of raw materials can be reduced, and the production cost is further reduced. The invention provides a preparation method of the molten iron heat preservation agent and also provides a method for preserving temperature of the molten iron.
Description
Technical field
The invention belongs to technical field of smelting, more particularly, to a kind of hot-metal insulating agent, its preparation method and hot-metal insulating
Method.
Background technology
Ironmaking is the technical process extracting metallic iron from the iron-bearing mineral oxide of iron (predominantly), mainly has
Blast furnace process, direct-reduction process, smelting reduction process and plasma method, are the important steps during iron and steel produces.Due to blast furnace ironmaking skill
Art economic indicator is good, process is simple, and output is big, and labor productivity is high, and energy consumption is low, so blast furnace ironmaking is widely used, this
The iron that the method for kind produces accounts for more than the 95% of World Iron total output.
Blast furnace process is continuous flow procedure reduction of iron ore being become the pig iron.During production, from furnace roof (general furnace roof be by
Bell is formed with hopper, and modernized blast furnace is clock valve furnace roof and bell-less BF tep) constantly load iron ore, coke, flux, from
The air port of bottom house blows into hot blast (1000～1300 degrees Celsius), sprays into the fuel such as oil, coal or natural gas.Load in blast furnace
The compound of iron ore, mainly iron and oxygen.At high temperature, an oxidation of the carbon in coke and in injection material and carbon burning generation
Carbon carries out reduction reaction, the oxygen in iron ore is captured out, obtains iron.Iron ore produces the pig iron, molten iron by reduction reaction
Release from tapping hole.
Molten iron is put to hot-metal ladle and carriage, transports to steelmaking converter, you can carry out pneumatic steelmaking.Work according to pneumatic steelmaking
Skill, the heat basic source of pneumatic steelmaking is in the physical thermal of molten iron and chemical heat, under conditions of chemical heat is certain, the thing of molten iron
Can reason heat be to determine to smelt the key factor being smoothed out.But blast furnace transportation range to steelmaking converter is remote, etc.
Treat that the time is long, the temperature drop of molten iron is larger.Molten iron temperature is low to cause converter blow loss big, and steel technology is high, molten steel quality is no protected
The adverse consequences such as barrier and furnace life decline.Molten iron temperature is not only particularly significant to process for making, and the conveying to molten iron also has an impact,
Crust, the dross of hot-metal ladle and carriage if molten iron temperature in course of conveying is too low, can be caused, directly affect normal production operation.
Therefore, the temperature drop during hot metal transport is metallargist's question of common concern.
At present, it is typically employed in molten iron and add hot-metal insulating agent to reach the purpose reducing hot metal temperature drop, but existing
Hot-metal insulating agent composition be carbonization rice husk, heat insulation effect is poor, in 38min, the average temperature drop of molten iron at 169 DEG C about,
The higher demand of production can not be met.
Content of the invention
It is an object of the invention to provide a kind of hot-metal insulating agent, the hot-metal insulating agent heat insulation effect that the present invention provides is relatively
Good.
The present invention provides a kind of hot-metal insulating agent, including the component of following mass fraction：
Carbonization rice husk：55～80%；
Flyash：10～35%；
Pearl sand：5～20%.
Preferably, the mass fraction of described carbonization rice husk is 60～75%.
Preferably, the mass fraction of described flyash is 15～30%.
Preferably, the bulk density of described flyash is 0.7～0.85g/cm3.
Preferably, the mass fraction of described pearl sand is 10～15%.
Preferably, the particle diameter ＞ 0mm and≤1mm of described pearl sand.
The present invention provides a kind of preparation method of hot-metal insulating agent, comprises the following steps：
By mass fraction be 55～80% carbonization rice husk, mass fraction be 10～35% flyash and mass fraction be 5
～20% pearl sand mixing, obtains hot-metal insulating agent.
The present invention provides a kind of method of hot-metal insulating, comprises the following steps：
Heat preserving agent is mixed with molten iron, the molten iron after being incubated；Described heat preserving agent is the iron described in technique scheme
The hot-metal insulating agent that preparation method described in water heat preserving agent or technique scheme obtains.
Preferably, in terms of molten iron per ton, the consumption of described heat preserving agent is 0.4～0.55kg/t.
The invention provides a kind of hot-metal insulating agent, including the component of following mass fraction：Carbonization rice husk：55～80%；
Flyash：10～35%；Pearl sand：5～20%.The hot-metal insulating agent that the present invention provides has relatively low fusing point and good paving
Malleability, after adding molten iron, being difficult to reunite on the surface of molten iron, thus effectively reducing the temperature drop of molten iron, improve hot-metal insulating agent
Heat-insulating property.Experimental data shows, after the hot-metal insulating agent being provided using the present invention, in 40min, the temperature drop of molten iron is
149℃.In addition, the hot-metal insulating agent that the present invention provides can also reduce the consumption of raw material, and then reduce the cost producing.
Specific embodiment
The present invention provides a kind of hot-metal insulating agent, including the component of following mass fraction：Carbonization rice husk：55～80%；Powder
Coal ash：10～35%；Pearl sand：5～20%.
The hot-metal insulating agent that the present invention provides has relatively low fusing point and good spreadability, can effectively reduce molten iron
Temperature drop, improves the heat-insulating property of hot-metal insulating agent.
The hot-metal insulating agent that the present invention provides includes carbonization rice husk, and the mass fraction of described carbonization rice husk is 55～80%,
It is preferably 60～75%, more preferably 65～70%.The present invention does not have special restriction to the source of described carbonization rice husk, can adopt
With the commercial goods of described carbonization rice husk, also can according to the technical scheme preparing carbonization rice husk well known to those skilled in the art from
Row preparation.The present invention preferably obtains carbonization rice husk according to following steps：
Rice husk is carried out carbonization, obtains carbonization rice husk.
The present invention does not have special restriction to the source of described rice husk, using the commercial goods of described carbonization rice husk.
In the present invention, the time of described carbonization is preferably 20～40min, more preferably 25～35min；The temperature of described carbonization is preferred
For 400～600 DEG C, more preferably 420～580 DEG C.
The hot-metal insulating agent that the present invention provides includes flyash, and the mass fraction of described flyash is 10～35%, preferably
For 15～30%, more preferably 20～25%；The bulk density of described flyash is preferably 0.7～0.85g/cm3, more preferably
0.72～0.83, most preferably 0.75～0.8g/cm3.The present invention does not have special restriction to the source of described flyash, can adopt
With the commercial goods of described flyash, the well known to those skilled in the art technical scheme of preparing flyash may also be employed and voluntarily make
Standby.Specifically, in an embodiment of the present invention, the flue gas fine ash that can be produced using coal combustion in power plant.
The hot-metal insulating agent that the present invention provides includes pearl sand, and the mass fraction of described pearl sand is 5～20%, preferably
8～18%, more preferably 10～15%；The particle diameter of described pearl sand be preferably ＞ 0mm and≤1mm, more preferably >=0.2mm and
≤0.8mm.The present invention does not have special restriction to the source of described pearl sand, can adopt the commercial goods of described pearl sand,
Voluntarily can prepare according to the technical scheme of preparation pearl sand well known to those skilled in the art.
Present invention also offers a kind of preparation method of hot-metal insulating agent, comprise the following steps：
By mass fraction be 55～80% carbonization rice husk, mass fraction be 10～35% flyash and mass fraction be
5～20% pearl sand mixing, obtains hot-metal insulating agent.
Flyash and pearl sand are preferably first screened by the present invention, by the flyash after carbonization rice husk and screening and pearl
Sand mixes, and obtains hot-metal insulating agent.
In the present invention, the consumption of described flyash and originate consumption and source one with flyash in technique scheme
Cause, will not be described here；The consumption of described pearl sand is consistent with the consumption of pearl sand in technique scheme and source with source,
Will not be described here.In the present invention, the particle diameter of described screening be preferably ＞ 0mm and≤1mm, more preferably >=0.2mm and≤
0.8mm, most preferably >=0.4mm and≤0.6mm.The present invention does not have special restriction to the method and apparatus of described screening, adopts
With screening technique well known to those skilled in the art and screening installation.
After completing screening, by carbonization rice husk, the flyash obtaining and pearl sand mix the present invention with screening, obtain molten iron and protect
Warm agent.In the present invention, the consumption of described carbonization rice husk and originate consumption and source with carbonization rice husk in technique scheme
Unanimously, will not be described here.The present invention does not have special limit to the mixed method of described carbonization rice husk, flyash and pearl sand
System, can make each component mix.
Present invention also offers a kind of method of hot-metal insulating, comprise the following steps：
Heat preserving agent is mixed with molten iron, the molten iron after being incubated；Described heat preserving agent is the iron described in technique scheme
The hot-metal insulating agent that preparation method described in water heat preserving agent or technique scheme obtains.
In the present invention, described heat preserving agent is consistent with the hot-metal insulating agent described in technique scheme, and here is no longer superfluous
State.The present invention does not have special restriction to the source of described molten iron, and in an embodiment of the present invention, described molten iron is derived from Sichuan moral
Sheng Fan titanium Co., Ltd.
The present invention does not have special restriction to the mode of described mixing, and described hot-metal insulating agent is preferably put into iron by the present invention
In water pot, described hot-metal insulating agent is made to cover on the surface of molten iron.In the present invention, in terms of molten iron per ton, described heat preserving agent
Consumption is preferably 0.4～0.55kg/t, more preferably 0.45～0.5kg/t.
The hot-metal insulating agent that the present invention is obtained puts in hot-metal bottle, carries out the insulation of molten iron, in terms of molten steel per ton, material
Consumption can reduce 0.11kg/t.The present invention provide hot-metal insulating agent production cost lower than existing hot-metal insulating agent 380 yuan/
Ton, molten iron per ton can 0.39 yuan of reduces cost, by often producing the measuring and calculating of 2,000,000 tons of iron per year, direct economic benefit reaches 780,000 yuan/year.And
And, after the hot-metal insulating agent being provided using the present invention, hot-metal bottle packet splicing significantly reduces.
The invention provides a kind of hot-metal insulating agent, including the component of following mass fraction：Carbonization rice husk：55～80%；
Flyash：10～35%；Pearl sand：5～20%.The hot-metal insulating agent that the present invention provides has relatively low fusing point and good paving
Malleability, after adding molten iron, being difficult to reunite on the surface of molten iron, thus effectively reducing the temperature drop of molten iron, improve hot-metal insulating agent
Heat-insulating property.Experimental data shows, after the hot-metal insulating agent being provided using the present invention, in 40min, the temperature drop of molten iron is
149℃.In addition, the hot-metal insulating agent that the present invention provides can also reduce the consumption of raw material, and then reduce the cost producing.
In order to further illustrate the present invention, with reference to embodiments to a kind of hot-metal insulating agent of present invention offer, its system
The method of Preparation Method and hot-metal insulating is described in detail, but can not be understood as limiting the scope of the present invention.
Embodiment 1
Rice husk is carried out carbonization, obtains carbonization rice husk；
Flyash and pearl sand are screened, screening particle diameter be ＞ 0mm and≤1mm, the flyash after screen with
Pearl sand；
28.77kg carbonization rice husk, 8.22kg bulk density are 0.78g/cm3Flyash and 4.11kg pearl sand mix
Close, obtain hot-metal insulating agent；
The hot-metal insulating obtaining agent is thrown to hot-metal bottle, then goes to make steel by hot metal transport.
The temperature of the molten iron that the present embodiment the provides when present invention measures ironmaking respectively and makes steel, result is as shown in table 1, table
1 is the heat insulation effect data of the hot-metal insulating agent that the embodiment of the present invention 1～2 and comparative example 1～3 obtain.
Embodiment 2
Rice husk is carried out carbonization, obtains carbonization rice husk；
Flyash and pearl sand are screened, screening particle diameter be ＞ 0mm and≤1mm, the flyash after screen with
Pearl sand；
24.66kg carbonization rice husk, 10.28kg bulk density are 0.7g/cm3Flyash and 6.16kg pearl sand mix
Close, obtain hot-metal insulating agent；
The hot-metal insulating obtaining agent is thrown to hot-metal bottle, then goes to make steel by hot metal transport.
The temperature of the molten iron that the present embodiment the provides when present invention measures ironmaking respectively and makes steel, result is as shown in table 1, table
1 is the heat insulation effect data of the hot-metal insulating agent that the embodiment of the present invention 1～2 and comparative example 1～3 obtain.
Comparative example 1
Rice husk is carried out carbonization, obtains carbonization rice husk；
Flyash is screened, screening particle diameter is ＞ 0mm and≤1mm, the flyash after being screened；
28.77kg carbonization rice husk is mixed with 12.33kg flyash, obtains hot-metal insulating agent；
Hot-metal insulating agent will be obtained throw to hot-metal bottle, and then go to make steel by hot metal transport.
The temperature of the molten iron that the present embodiment the provides when present invention measures ironmaking respectively and makes steel, result is as shown in table 1, table
1 is the heat insulation effect data of the hot-metal insulating agent that the embodiment of the present invention 1～2 and comparative example 1～3 obtain.
Comparative example 2
Rice husk is carried out carbonization, obtains carbonization rice husk；
Pearl sand is screened, screening particle diameter is ＞ 0mm and≤1mm, the pearl sand after being screened；
28.77kg carbonization rice husk is mixed with 12.33kg pearl sand, obtains hot-metal insulating agent；
Hot-metal insulating agent will be obtained throw to hot-metal bottle, and then go to make steel by hot metal transport.
The temperature of the molten iron that the present embodiment the provides when present invention measures ironmaking respectively and makes steel, result is as shown in table 1, table
1 is the heat insulation effect data of the hot-metal insulating agent that the embodiment of the present invention 1～2 and comparative example 1～3 obtain.
Comparative example 3
Rice husk is carried out carbonization, obtains carbonization rice husk；
50kg is obtained carbonization rice husk throw to hot-metal bottle, then go to make steel by hot metal transport.
The temperature of the molten iron that the present embodiment the provides when present invention measures ironmaking respectively and makes steel, result is as shown in table 1, table
1 is the heat insulation effect data of the hot-metal insulating agent that the embodiment of the present invention 1～2 and comparative example 1～3 obtain.
The heat insulation effect data of the hot-metal insulating agent that table 1 embodiment of the present invention 1～2 and comparative example 1～3 obtain
Not only consumption is few to can be seen that the hot-metal insulating agent of present invention offer by above-described embodiment and comparative example, and protects
Temp effect is good, and be more than the molten iron employing existing hot-metal insulating agent in molten iron online hours in the case of, the temperature drop of molten iron is than existing
Some hot-metal insulating agent reduce about 20 DEG C, and the hot-metal insulating agent high insulating effect that the present invention provides is described.
The above is only the preferred embodiment of the present invention it is noted that ordinary skill people for the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of hot-metal insulating agent, is grouped into by the group of following mass fraction：
Carbonization rice husk：55～80%；
Flyash：10～35%；
Pearl sand：5～20%；
The particle diameter ＞ 0mm of described pearl sand and≤1mm；
The bulk density of described flyash is 0.7～0.85g/cm3.
2. hot-metal insulating agent according to claim 1 it is characterised in that described carbonization rice husk mass fraction be 60～
75%.
3. hot-metal insulating agent according to claim 1 it is characterised in that described flyash mass fraction be 15～
30%.
4. hot-metal insulating agent according to claim 1 it is characterised in that described pearl sand mass fraction be 10～
15%.
5. a kind of preparation method of hot-metal insulating agent, comprises the following steps：
By mass fraction be 55～80% carbonization rice husk, mass fraction be 10～35% flyash and mass fraction be 5～
20% pearl sand mixing, obtains hot-metal insulating agent；
The particle diameter ＞ 0mm of described pearl sand and≤1mm.
6. a kind of method of hot-metal insulating, comprises the following steps：
Heat preserving agent is mixed with molten iron, the molten iron after being incubated；Described heat preserving agent is described in Claims 1 to 4 any one
Hot-metal insulating agent or claim 5 described in the hot-metal insulating agent that obtains of preparation method.
7. method according to claim 6 is it is characterised in that in terms of molten iron per ton, and the consumption of described heat preserving agent is 0.4～
0.55kg/t.
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| CN201410508226.2A CN104313212B (en) | 2014-09-28 | 2014-09-28 | Molten iron heat preservation agent, preparation method of molten iron heat preservation agent and method for preserving temperature of molten iron |
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| CN104313212B true CN104313212B (en) | 2017-02-22 |
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| CN105018663A (en) * | 2015-08-14 | 2015-11-04 | 武钢集团昆明钢铁股份有限公司 | Molten iron biomass composite insulation agent and preparation method and application thereof |
| CN107893145A (en) * | 2017-08-22 | 2018-04-10 | 广西柳钢环保股份有限公司 | Thermal-insulating covering agent |
| CN107552746B (en) * | 2017-08-31 | 2020-04-07 | 赣州鼎洋贸易有限公司 | Molten steel heat-insulating agent and heat-insulating agent layer thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101126114A (en) * | 2007-07-27 | 2008-02-20 | 上海盛宝钢铁冶金炉料有限公司 | Granular charring rice husk thermal insulation agent |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1020335C (en) * | 1990-09-10 | 1993-04-21 | 李新合 | Synthetic protector for ingot casting |
| CN1062313C (en) * | 1996-06-24 | 2001-02-21 | 周光焰 | Heat-insulation molten steel heat-insulating agent |
| CN1098130C (en) * | 2000-08-01 | 2003-01-08 | 郭玉华 | Grcular particles of insulating agent for molten steel and its preparing process |
| CN101892332B (en) * | 2010-07-05 | 2012-05-09 | 北京科技大学 | Energy-saving slag thermal insulator |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101126114A (en) * | 2007-07-27 | 2008-02-20 | 上海盛宝钢铁冶金炉料有限公司 | Granular charring rice husk thermal insulation agent |
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