CN107552746B - Molten steel heat-insulating agent and heat-insulating agent layer thereof - Google Patents
Molten steel heat-insulating agent and heat-insulating agent layer thereof Download PDFInfo
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Abstract
The invention discloses a molten steel heat-insulating agent, belonging to the field of heat-insulating agents, wherein the molten steel heat-insulating agent comprises the following components in parts by weight: carbonizing rice hull ash: 70-100 parts; carbon source: 1-10 parts; silicon source: 1-30 parts; the carbonized rice hull ash comprises the following elements in percentage by mass: c: 2-17%; si: 40-60%; and the balance: H. o, S, Ca, Fe, P; the water content of the carbonized rice hull ash is less than 3% of the total mass of the heat preservation agent; the bulk density of the molten steel heat-preserving agent is 0.18-0.35 g/cm 3. Compared with carbonized rice hulls with honeycomb structures, the molten steel heat preservation agent provided by the invention has the advantages that the highest temperature drop of the molten steel surface can be 1.56 ℃ per minute‑1Cooling to 0.78 deg.C/min‑1. The molten steel heat insulating agent provided by the invention has the advantages of low heat conductivity coefficient, good heat insulating effect, excellent spreading performance, no caking and low production cost.
Description
Technical Field
The invention relates to the field of heat insulating agents, in particular to a molten steel heat insulating agent and a heat insulating agent layer thereof.
Background
In the blast furnace ironmaking process, molten steel is transported from an ironmaking blast furnace to a steelmaking converter, but the transportation distance between the ironmaking blast furnace and the steelmaking converter is long, the waiting time is long, and the temperature of the molten steel is fast, so that a heat preserving agent is often required to be added into the molten steel to preserve the heat of the molten steel. In recent years, with the gradual increase of production scale and capacity and the progress of production technology, the capacity of the steel ladle is gradually increased, and the retention time of molten steel in the ladle is prolonged. In order to meet the subsequent process requirements, a large amount of heat preservation agent is used, and the temperature and the quality of molten iron and steel in the ladle are kept, which is an important problem.
The heat insulating agent for the molten steel used at present is mainly carbonized rice hulls, the fixed carbon content of the heat insulating agent is high, the heat insulating agent can only be used for a heat insulating agent for high-carbon steel, the application range is narrow, the spreading effect is not good, and the heat insulating effect is to be improved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a molten steel heat-insulating agent and a heat-insulating agent layer thereof, which can meet the requirements of low production cost, good heat-insulating effect, less iron adhesion and the like.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a molten steel heat-insulating agent which comprises the following components in parts by weight: carbonizing rice hull ash: 70-100 parts; carbon source: 1-10 parts; silicon source: 1-30 parts; the carbonized rice hull ash comprises the following elements in percentage by mass: c: 2-17%; si: 40-60%; and the balance: H. o, S, Ca, Fe, P; the water content of the carbonized rice hull ash is less than 3% of the total mass of the heat preservation agent; the bulk density of the molten steel heat-insulating agent is 0.18-0.35 g/cm3。
In a preferred technical scheme of the invention, the carbon source comprises one or two of coke powder and graphite powder; the average grain size of the carbon source is not more than 100nm, and the grain size range is more than 90% between 90 nm and 100 nm; the mass percentage of the carbon source carbon is more than 85%.
In a preferred technical scheme of the invention, the silicon source comprises one or more of dusted perlite, fly ash, diatomite and vermiculite; the average particle size of the silicon source is not more than 100nm, and the particle size range is more than 85% between 90 nm and 100 nm; the mass percentage of the silicon source silicon is more than 92%.
In a preferred technical scheme of the invention, the spreading thickness of the molten steel heat-preserving agent is 2-5 cm.
The invention also provides a molten steel heat-preserving agent layer, which comprises an outer S1 layer formed by the molten steel heat-preserving agent and an inner S2 layer, wherein the S2 layer comprises the following components in parts by weight: SiO 22: 40-60 parts; MgO: 15-20 parts of a solvent; CaO: 30-50 parts of a solvent; al (Al)2O3: 15-20 parts of a solvent; y is2O3: 1-5 parts; cr (chromium) component2O3: 1-5 parts; adhesive agent: 0.5-1 part; foaming agent: 0.5-1 part.
In a preferred technical scheme of the invention, the average grain diameter of the S2 layer is less than 1 mm; the bulk density of the S2 layer is 0.35-0.55 g/cm3。
In a preferred technical scheme of the invention, the adhesive is carboxymethyl cellulose or sodium carboxymethyl cellulose.
In a preferred technical scheme of the invention, the foaming agent is one or two of sodium abietate, calcium carbide, bicarbonate and syrup; when the blowing agent is two materials, the mass of each material is equal.
In a preferred technical scheme of the invention, the spreading thickness of the S2 layer is 1-2 cm.
The invention has the beneficial effects that:
the ash content of the carbonized rice hulls is used in the molten steel heat insulating agent provided by the invention, and compared with the carbonized rice hulls with honeycomb structures, the temperature drop rate of the molten steel surface is reduced to 1.56 ℃ per minute at most-1Cooling to 0.78 deg.C/min-1。
The molten steel heat insulating agent provided by the invention has the advantages of low heat conductivity coefficient, good heat insulating effect, excellent spreading performance, no caking and low production cost.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments.
Example 1
The invention provides a molten steel heat-insulating agent which comprises the following components in parts by weight: carbonizing rice hull ash: 70 parts of (B); carbon source (coke powder): 10 parts of (A); silicon source (dusted perlite): 1 part; the carbonized rice hull ash comprises the following elements in percentage by mass: c: 2 percent; si: 60 percent; the balance of 38%: H. o, S, Ca, Fe, P; the water content of the carbonized rice hull ash is 0.7 percent of the total mass of the heat preservation agent; the bulk density of the S1 layer was 0.35g/cm3。
The average grain diameter of the carbon source is not more than 100nm, and the grain diameter range is 90-100 nm; the mass percentage of the carbon source carbon is 87.15%. The average particle size of the silicon source is not more than 100nm, and the particle size range is 85% between 90 nm and 100 nm; the mass percent of the silicon source silicon is 92.05%. The carbon source and the silicon source are both nano-grade powder, and most of the carbon source and the silicon source have the particle size close to 100nm, so that the heat preservation effect is better.
The spread thickness of the S1 layer was 2cm while ensuring the heat retention effect and avoiding waste.
Example 2
The invention provides a molten steel heat-insulating agent which comprises the following components in parts by weight: carbonizing rice hull ash: 85 parts of a mixture; carbon source (coke powder, graphite powder): 5 parts of a mixture; silicon source (dusted perlite, fly ash): 15 parts of (1); the carbonized rice hull ash comprises the following elements in percentage by mass: c: 10 percent; si: 50 percent; the balance of 40%: H. o, S, Ca, Fe, P; the water content of the carbonized rice hull ash is 1.7 percent of the total mass of the heat preservation agent; the bulk density of the S1 layer was 0.20g/cm3。
The average grain diameter of the carbon source is not more than 100nm, and the grain diameter range is 90-100 nm; the mass percentage of the carbon source carbon is 87.15%. The average particle size of the silicon source is not more than 100nm, and the particle size range is 85% between 90 nm and 100 nm; the mass percentage of the silicon source silicon is 92%.
The spread thickness of the S1 layer was 3 cm.
Example 3
The invention provides a molten steel heat-insulating agent which comprises the following components in parts by weight: carbonizing rice hull ash: 100 parts of (A); carbon source (graphite powder): 1 part; silicon source (dusted perlite, fly ash, diatomaceous earth): 30 parts of (1); the carbonized rice hull ash comprises the following elements in percentage by mass: c: 17 percent; si: 40 percent; the balance of 43%: H. o, S, Ca, Fe, P; the water content of the carbonized rice hull ash is 3% of the total mass of the heat preservation agent; the bulk density of the S1 layer was 0.18g/cm3。
The average grain diameter of the carbon source is not more than 100nm, and the grain diameter range is 95% between 90 nm and 100 nm; the mass percentage of the carbon source carbon is 85%. The average particle size of the silicon source is not more than 100nm, and the particle size range is 85% between 90 nm and 100 nm; the mass percent of the silicon source silicon is 96%.
The spread thickness of the S1 layer was 5 cm.
Example 4
The invention provides a molten steel heat-insulating agent layer, wherein an outer layer S1 layer comprises the following components in parts by mass: carbonizing rice hull ash: 70 parts of (B); carbon source (coke powder): 10 parts of (A); silicon source(dusted perlite): 1 part; the carbonized rice hull ash comprises the following elements in percentage by mass: c: 2 percent; si: 60 percent; the balance of 38%: H. o, S, Ca, Fe, P; the water content of the carbonized rice hull ash is 0.7 percent of the total mass of the heat preservation agent; the bulk density of the S1 layer was 0.35g/cm3。
The average grain diameter of the carbon source is not more than 100nm, and the grain diameter range is 90-100 nm; the mass percentage of the carbon source carbon is 87.15%. The average particle size of the silicon source is not more than 100nm, and the particle size range is 85% between 90 nm and 100 nm; the mass percent of the silicon source silicon is 92.05%. The carbon source and the silicon source are both nano-grade powder, and most of the carbon source and the silicon source have the particle size close to 100nm, so that the heat preservation effect is better.
The inner layer S2 comprises the following components in parts by mass: SiO 22: 40 parts of a mixture; MgO: 15 parts of (1); CaO: 30 parts of (1); al (Al)2O3: 15 parts of (1); y is2O3: 1 part; cr (chromium) component2O3: 1 part; binder (carboxymethyl cellulose): 0.5 part; foaming agent (sodium abietate): 0.5 part. The S2 layer contains almost no carbon, so the heat insulation material is more suitable for heat insulation of low-carbon steel or ultra-low-carbon steel, and has better heat insulation effect.
In order to keep good heat preservation effect, the average grain diameter of the S2 layer is less than 1 mm; the bulk density of the S2 layer was 0.35g/cm3。
Under the condition of ensuring the heat preservation effect and avoiding waste, the spreading thickness of the S1 layer is 2 cm; the spread thickness of the S2 layer was 1 cm.
Example 5
The invention provides a molten steel heat-insulating agent, wherein an outer layer S1 layer comprises the following components in parts by mass: carbonizing rice hull ash: 70 parts of (B); carbon source (coke powder): 10 parts of (A); silicon source (dusted perlite): 1 part; the carbonized rice hull ash comprises the following elements in percentage by mass: c: 2 percent; si: 60 percent; the balance of 38%: H. o, S, Ca, Fe, P; the water content of the carbonized rice hull ash is 0.7 percent of the total mass of the heat preservation agent; the bulk density of the S1 layer was 0.25g/cm3。
The average grain diameter of the carbon source is not more than 100nm, and the grain diameter range is 90-100 nm; the mass percentage of the carbon source carbon is 87.15%. The average particle size of the silicon source is not more than 100nm, and the particle size range is 85% between 90 nm and 100 nm; the mass percent of the silicon source silicon is 92.05%. The carbon source and the silicon source are both nano-grade powder, and most of the carbon source and the silicon source have the particle size close to 100nm, so that the heat preservation effect is better.
The inner layer S2 comprises the following components in parts by mass: SiO 22: 50 parts of a mixture; MgO: 17 parts of (1); CaO: 40 parts of a mixture; al (Al)2O3: 17 parts of (1); y is2O3: 3 parts of a mixture; cr (chromium) component2O3: 3 parts of a mixture; binder (sodium carboxymethyl cellulose): 0.7 part; foaming agent (calcium carbide, bicarbonate): 0.7 part.
In a preferred technical scheme of the invention, the average grain diameter of the S2 layer is less than 1 mm; the bulk density of the S2 layer was 0.45g/cm3。
Under the condition of ensuring the heat preservation effect and avoiding waste, the spreading thickness of the S1 layer is 2 cm; the spread thickness of the S2 layer was 1.5 cm.
Example 6
The invention provides a molten steel heat-insulating agent, wherein an outer layer S1 layer comprises the following components in parts by mass: carbonizing rice hull ash: 70 parts of (B); carbon source (coke powder): 10 parts of (A); silicon source (dusted perlite): 1 part; the carbonized rice hull ash comprises the following elements in percentage by mass: c: 2 percent; si: 60 percent; the balance of 38%: H. o, S, Ca, Fe, P; the water content of the carbonized rice hull ash is 0.7 percent of the total mass of the heat preservation agent; the bulk density of the S1 layer was 0.18g/cm3。
The average grain diameter of the carbon source is not more than 100nm, and the grain diameter range is 90-100 nm; the mass percentage of the carbon source carbon is 87.15%. The average particle size of the silicon source is not more than 100nm, and the particle size range is 85% between 90 nm and 100 nm; the mass percent of the silicon source silicon is 92.05%. The carbon source and the silicon source are both nano-grade powder, and most of the carbon source and the silicon source have the particle size close to 100nm, so that the heat preservation effect is better.
The spread thickness of the S1 layer was 2cm while ensuring the heat retention effect and avoiding waste.
The inner layer S2 comprises the following components in parts by mass: SiO 22: 60 parts; MgO: 20 parts of (1); CaO: 50 parts of a mixture; al (Al)2O3: 20 parts of (1); y is2O3: 5 parts of a mixture; cr (chromium) component2O3: 5 parts of a mixture; binder (carboxymethyl cellulose): 1 part; foaming agent (calcium carbide, syrup): 1 part.
In a preferred technical scheme of the invention, the average grain diameter of the S2 layer is less than 1 mm; the bulk density of the S2 layer was 0.55g/cm3(ii) a The spreading thickness of the S2 layer is 1-2 cm.
Comparative example: the main component was carbonized rice husk, and the bulk density and spread thickness were the same as in example 1.
The temperature drop test of the surface of molten steel was carried out by using the heat retaining agents prepared in examples 1 to 6 and comparative example, and the test results are shown in the following table:
as can be seen from the table, the temperature drop of the surface of the molten steel of the heat retaining agent prepared in examples 1 to 6 can be up to 1.56 ℃ per minute compared with the heat retaining agent prepared in comparative example-1Cooling to 0.78 deg.C/min-1. Further, since the heat retaining agent used in the comparative example is mainly the carbonized rice husk, the content of the fixed carbon is relatively high, and it is not suitable for retaining heat of molten steel other than high carbon steel.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the invention. The present invention is not to be limited by the specific embodiments disclosed herein, and other embodiments that fall within the scope of the claims of the present application are intended to be within the scope of the present invention.
Claims (9)
1. The molten steel heat preservation agent is characterized by comprising the following components in parts by mass:
carbonizing rice hull ash: 70-100 parts;carbon source: 1-10 parts; silicon source: 1-30 parts; the carbonized rice hull ash comprises the following elements in percentage by mass: c: 2-17%; si: 40-60%; and the balance: H. o, S, Ca, Fe, P; the water content of the carbonized rice hull ash is less than 3% of the total mass of the heat preservation agent; the bulk density of the molten steel heat-insulating agent is 0.18-0.35 g/cm3；
The average grain size of the carbon source is not more than 100nm, and the grain size range is more than 90% between 90 nm and 100 nm;
the average grain size of the silicon source is not more than 100nm, and the grain size range is more than 85% between 90 nm and 100 nm.
2. The molten steel heat-retaining agent according to claim 1, characterized in that:
the carbon source comprises one or two of coke powder and graphite powder;
the mass percentage of the carbon source carbon is more than 85%.
3. The molten steel heat-retaining agent according to claim 1, characterized in that:
the silicon source comprises one or more of dusted perlite, fly ash, diatomite and vermiculite;
the mass percentage of the silicon source silicon is more than 92%.
4. The molten steel heat-retaining agent according to claim 1, characterized in that:
the spreading thickness of the molten steel heat-insulating agent is 2-5 cm.
5. The molten steel heat insulating agent layer is characterized by comprising an outer S1 layer formed by the molten steel heat insulating agent of claim 1 and an inner S2 layer, wherein the S2 layer comprises the following components in parts by mass: SiO 22: 40-60 parts; MgO: 15-20 parts of a solvent; CaO: 30-50 parts of a solvent; al (Al)2O3: 15-20 parts of a solvent; CaF2: 5-10 parts; y is2O3: 1-5 parts; cr (chromium) component2O3: 1-5 parts; adhesive agent: 0.5-1 part; foaming agent: 0.5-1 part.
6. The molten steel heat-retaining agent layer according to claim 5, characterized in that:
the average grain diameter of the S2 layer is less than 1 mm;
the bulk density of the S2 layer is 0.35-0.55 g/cm3。
7. The molten steel heat-retaining agent layer according to claim 5, characterized in that:
the adhesive is carboxymethyl cellulose.
8. The molten steel heat-retaining agent layer according to claim 5, characterized in that:
the foaming agent is one or two of sodium abietate, calcium carbide, bicarbonate and syrup; when the blowing agent is two materials, the mass of each material is equal.
9. The molten steel heat-retaining agent layer according to claim 5, characterized in that:
the spreading thickness of the S2 layer is 1-2 cm.
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| CN107893145A (en) * | 2017-08-22 | 2018-04-10 | 广西柳钢环保股份有限公司 | Thermal-insulating covering agent |
| 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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