CN111286575A - Reduction iron-making complexing agent and preparation method and application thereof - Google Patents
Reduction iron-making complexing agent and preparation method and application thereof Download PDFInfo
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- CN111286575A CN111286575A CN202010328441.XA CN202010328441A CN111286575A CN 111286575 A CN111286575 A CN 111286575A CN 202010328441 A CN202010328441 A CN 202010328441A CN 111286575 A CN111286575 A CN 111286575A
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/008—Use of special additives or fluxing agents
Abstract
The invention relates to a reduction iron-making complexing agent, a preparation method and application thereof, wherein the reduction iron-making complexing agent consists of first particles and second particles, the first particles are particles prepared from components comprising low-sulfur coal dust, water glass and iron ore particles, the second particles are low-sulfur coal particles, and the complexing agent has multiple functions. Adding the reduction iron-making complexing agent into a molten steel slag molten pool to perform a reduction iron reaction, wherein the reaction process is performed in a semi-closed heat-preservation environment, and the temperature of the molten pool is maintained at 1400-1500 ℃. In the process of reducing iron, injecting O into the reducing iron system2Or preheated air. The complexing agent provided by the invention is used for reducing and ironmaking molten steel slag, so that the diffusion condition of a reaction molten pool is greatly improved, the reaction speed of reduced iron is accelerated, and iron oxide in the slag can be completely reduced.
Description
Technical Field
The invention belongs to the technical field of non-blast furnace ironmaking, and particularly relates to a molten steel slag reduction ironmaking complexing agent, and a preparation method and application thereof.
Background
The ratio of converter steelmaking slag to steel is about 8-15%, and the ratio of electric arc furnace steelmaking slag to steel is about 6-10%. The annual crude steel production in China is about 8 hundred million tons, and the annual byproduct steelmaking slag is at least 8000 ten thousand tons. Converter steelmaking slag contains about 16-20% of iron oxide, electric arc furnace steelmaking slag contains about 22-28% of iron oxide, and about 8000 million tons of steelmaking slag are poured in China every year, the steelmaking slag contains about 1600 million tons of pure iron oxide, which is equivalent to about 2700 million tons of iron ore concentrate every year, and which is equivalent to 200 billions of yuan of iron ore according to the current iron-making raw material with the price of about 750 yuan/ton.
The iron oxide content in the steel-making slag belongs to low grade, but the temperature of the steel-making slag when discharged from the furnace is up to 1450-1650 ℃, and the steel-making slag is in a molten state. Therefore, how to fully utilize the iron oxide and the heat thereof in the molten steel slag to realize non-blast furnace ironmaking with low energy consumption, low emission and low cost is a technical problem which is eagerly solved in the field.
Disclosure of Invention
The invention aims to solve the technical problem of realizing non-blast furnace reduction ironmaking by utilizing molten steel slag, thereby providing a reduction ironmaking complexing agent, a preparation method thereof and a method for carrying out reduction ironmaking on the molten steel slag by utilizing the reduction ironmaking complexing agent.
According to one aspect of the invention, the reduction iron-making complexing agent is composed of first particles and second particles, wherein the first particles are particles prepared from components comprising low-sulfur coal powder, water glass and iron ore particles, and the iron ore particles are selected from one or more of blast furnace dust, rolled iron phosphorus or iron concentrate powder; the second particles are low-sulfur coal particles.
Preferably, the first and second particles each have a particle size of 2 to 6 mm.
Preferably, the specific gravity of the low-sulfur coal powder and the iron ore particles in the first particle component is greater than the density of the molten steel slag, and the mass ratio of the water glass is 3-5% of the total mass of the iron ore particles and the low-sulfur coal powder.
Preferably, the water glass in the first particulate component is dehydrated water glass Na having a melting point of 790-810 ℃2SiO3。
According to another aspect of the invention, the preparation method of the reduction iron-making complexing agent is characterized by mixing iron ore particles, low-sulfur coal powder and water glass, adding water accounting for 11-13% of the mass of the raw materials, fully stirring, carrying out extrusion forming, drying, crushing, and screening to obtain first particles with the particle size of 2-6 mm; uniformly mixing the first particles and the second particles with the particle size of 2-6 mm.
According to another aspect of the invention, the use of the above-mentioned reduction iron-making complexing agent for high-temperature liquid molten steel slag reduction iron making is provided.
In the above uses, the reduction iron-making complexing agent is used as a reducing agent, a binder, a curing agent, a stirring agent, a catalyst, a diluent and a heat generating agent.
According to another aspect of the invention, a method for reducing and ironmaking by using molten steel slag is provided, wherein the above-mentioned reduction and ironmaking complexing agent is added into a molten steel slag molten pool to perform a reduced iron reaction, the reaction process is performed in a semi-closed heat preservation environment, and the temperature of the molten pool is maintained at 1400-1500 ℃.
Preferably, during the reaction of reduced iron, O is injected into the reduced iron system2Or preheated air.
Preferably, the reducing ironmaking complexing agent is carried by 0.5-1MPa compressed air and added into the steel slag molten pool by rotary spraying.
Compared with the prior art, the method has the following beneficial effects: the complexing agent provided by the invention is used for reducing and ironmaking molten steel slag, so that the diffusion condition of a reaction molten pool is greatly improved, the reaction speed of reduced iron is accelerated, and iron oxide in the slag can be completely reduced. The non-blast furnace ironmaking with low energy consumption, environmental protection and low cost can be continuously realized; the solid waste of the steel slag can be reduced by about 20 percent, and the waste is changed into valuable.
Detailed Description
Reduction iron-smelting complexing agent
The reduction iron-making complexing agent consists of first particles and second particles, wherein the first particles are particles prepared from components comprising low-sulfur coal powder, water glass and iron ore particles, and the iron ore particles are selected from one or more of rotary furnace ash, steel rolling iron phosphorus or iron concentrate powder; the second particles are low-sulfur coal particles.
When the reduction ironmaking complexing agent is used for reduction ironmaking of molten steel slag, the reduction ironmaking complexing agent at least has the following seven functions of being used as a reducing agent, a binder, a curing agent, a stirring agent, a catalyst, a diluent and a heat generating agent.
The coal in the complexing agent is used as a reducing agent, and the following reduced iron reaction is completed by mainly utilizing fixed carbon in the coal: FeO + C is Fe + CO, the reducing coal and the prepared stirring agent particles are moderate, too large specific surface area is reduced, fast reaction is not facilitated, too small specific surface area is easily carried away by flue gas, and preferably, the reducing agent is 2-6mm of particle coal. Preferably, the reductant coal is low-sulfur coal particles containing a substantial amount of volatile components. At temperatures above 1450 ℃, carbon also dissolves in the iron bath in a suitable amount to reduce the Si, Mn and carbon contained in the slag. The addition amount of the reducing agent is determined according to the content of iron oxide in the steel slag and the weight of the molten slag and the proper excess principle of equivalent weight of carbon, oxygen and the like, the reducing agent is used as a stirring agent and is prepared by adding water into low-sulfur coal powder, iron ore particles and water glass, stirring, then carrying out extrusion forming, drying, then crushing and screening to obtain first particles with the particle size of 2-6mm, and the specific gravity of the first particles is greater than the density of the molten steel slag. Preferably, the mass ratio of the water glass in the first particles is 3-5% of the total mass of the iron ore particles and the low-sulfur coal powder, and the specific gravity of the low-sulfur coal powder and the iron ore particles is greater than the density of the molten steel slag. The purity of ferric oxide in the stirring agent is improved as much as possible, and the heat loss of non-ferric oxide impurities caused by heating and melting is reduced as much as possible.
The preparation of the stirring agent needs to be noticed, wherein the particle sizes of iron ore particles and coal are thinned as much as possible, for example, the particle sizes of the iron ore particles (converter ash, steel rolling iron phosphorus and iron concentrate powder) and low-sulfur coal powder are respectively 200 meshes, and the three substances of the catalyst are stirred uniformly as much as possible; thirdly, the molding pressure is required to be properly large to ensure that the specific gravity of the finished product is greater than the density of the molten slag.
The stirring agent is added into the molten steel slag and naturally sinks to the lower part and the bottom of the steel slag, iron ore in the particles and carbon in the coal generate reduced iron reaction, CO is byproduct, and volatile matter H in the coal is released2When the gas is aggregated into bubbles, the bubbles float upwards until overflowing from the molten steel slag, and the effect of stirring the molten steel slag from bottom to top is achieved, so that the original iron oxide in the molten steel slag is accelerated to diffuse and meets coal particles of a reducing agent, and the iron is reduced more quickly and thoroughly. The purpose of reducing more iron with low energy consumption and low cost can be realized by increasing the adding amount of the stirring agent.
The catalyst is sodium silicate ions in the mixture particles, which is favorable for adsorbing and capturing CO and H2As reducing agent gas and as secondary hand to remove CO and H2Transferring to FeO, and carrying out indirect reduction reaction.
Sodium silicate Na2SO3The catalyst is used as a catalyst, a binder and a curing agent, and is beneficial to forming of the stirring agent.
The diluent is water glass, in particular to dehydrated water glass Na with the melting point of 790 ℃ and 810 DEG C2SiO3。Dehydrated water glass Na having a preferred melting point of 800 DEG C2SiO3。
The exothermic agent refers to coal gas CO which is the byproduct of the reduced iron and H volatilized from volatile matters in the coal by heating2And (4) waiting for combustible gas, and burning to release heat.
The molten steel slag reduction iron-making complexing agent provided by the invention is preferably a mixture of low-sulfur coal particles with equivalent volatile matter and particle sizes of 2-6mm, iron ore particles with particle sizes of 2-6mm, coal and sodium salt, which are obtained by extrusion and screening, and the two particles according to a certain proportion. The addition amount of the simple coal particles is determined by calculating the appropriate increment of equivalent carbon (fixed carbon in coal) equal to O in iron oxide in the slag. The specific gravity is easy to reduce due to much carbon, and the coal blending amount in the stirring agent is determined by calculating the equivalent carbon (fixed carbon in coal) of O in iron ore.
Preparation method of reduction iron-making complexing agent
Mixing iron ore particles, low-sulfur coal powder and water glass, adding water accounting for 11-13% of the mass of the raw materials, fully stirring, carrying out extrusion forming, drying, crushing, and screening to obtain first particles with the particle size of 2-6 mm; uniformly mixing the first particles and the second particles with the particle size of 2-6 mm.
Preferably, the specific gravity of the low-sulfur coal powder and the iron ore particles in the first particle component is greater than the density of the molten steel slag; the mass ratio of the water glass is 3-5% of the total mass of the iron ore particles and the low-sulfur coal powder.
Because the densities of the steel slag at different temperatures of different steel mills are different, the extrusion molding pressure is such that the specific gravity of the mixture particles is greater than the density of the molten steel slag. Preferably, a double-shaft strong stirrer is used for stirring, the water mixing amount is small, and the material uniformity is high. Due to CO2Can be rapidly cured with high strength by reaction with water glass, and preferably contains CO2And the smoke at about 250 ℃ is in countercurrent forced drying with the wet extrusion block.
Method for reducing iron making by utilizing molten steel slag
The reduction iron-making complexing agent provided by the invention is used for reducing iron-making by high-temperature liquid molten steel slag.
The method for reducing and ironmaking by utilizing molten steel slag is characterized by adding the reducing and ironmaking complexing agent provided by the invention into a molten steel slag molten pool to perform a reduced iron reaction, wherein the reaction process is performed in a semi-closed heat-insulating environment, and the temperature of the molten pool is maintained at 1400-1500 ℃.
The amount of the complexing agent added into the molten steel slag is determined by calculation according to the equivalent weight of the fixed carbon of the coal particles in the complexing agent and the oxygen in the ferric oxide in the steel slag. The addition amount of the stirring agent and the catalyst particles in the complexing agent is determined by calculation according to the heat balance of a reduced iron system, and the addition of the stirring agent and the catalyst can reduce energy consumption, reduce cost and produce more iron on the premise of heat allowance.
In the iron-making reaction, FeO + C ═ Fe + CO is directly reduced iron, is an endothermic reaction, and lowers the temperature of molten slag, so that the slag temperature is too low to support diffusion, the reaction speed is lowered, and even solidification is carried out, and the reaction cannot be continued.
And FeO + CO ═ Fe + CO2Or FeO + H2＝Fe＋H2O is indirectly reduced iron and is an exothermic reaction.
Therefore, it is necessary to increase the indirect iron reduction reaction as much as possible, and the sodium salt of the catalyst is added properly within the range of 3-5% of the total weight of the iron ore particles and the low-sulfur coal powder. Secondly, CO and H overflowing the slag surface2Injecting O into the reduced iron system in a relatively closed heat-preserving reaction system in time when combustible gas reacts2Or preheated air for supporting combustion of CO generated as by-product of reduced iron and H in volatile matter in coal2And the temperature of the combustible gas is increased, the temperature gradient between the temperature of the flue gas and the temperature of the molten slag is increased, and the heat transfer to the molten slag is facilitated. The released combustion heat is transferred to the molten slag, the heat required by the reduced iron endothermic reaction and the system heat dissipation is compensated, and the temperature of the molten pool is maintained.
In the actual coal preparation, the volatile matter content in the reduced coal is selected according to the heat balance calculation and the experimental verification and correction so as to increase or reduce the combustible gas (H)2Etc.) to maintain the temperature of the reaction bath at 1400-1500 ℃.
The reducing ironmaking complexing agent is carried by 0.5-1MPa compressed air and is added into the steel slag melting tank by rotary spraying, and a feeding spray gun is adopted, so that the complexing agent is favorably sunk into slag, molten steel slag liquid mass is favorably splashed, and the heat absorption area of the molten steel slag is enlarged.
The technical solution and its effects claimed by the present invention are further illustrated by some specific examples.
Example 1
Preparing a reduction iron-making complexing agent 1. Mixing iron phosphorus, low-sulfur coal powder and water glass in steel rolling, adding water accounting for 11% of the raw materials by mass, fully stirring, carrying out extrusion forming, drying, crushing, screening to obtain first particles with the particle size of 2mm, wherein the mass ratio of the water glass is 3% of the total mass of the iron phosphorus and the low-sulfur coal powder in the steel rolling; the first granules and the second granules with the grain diameter of 2mm are mixed evenly.
Aiming at the steel slag components of the first factory: tfe19.8% (in slag as FeO), procured coal: 78.6 percent of fixed carbon and 10.03 percent of volatile matter, and the steel rolling iron phosphorus (96 percent of FeO) is used in the stirring agent.
The formula of the complexing agent needed to be added for 1 ton of molten slag reduction iron making is calculated as follows:
the dosage of the reducing agent coal particles is 198Kg multiplied (12 divided 72 divided 78.6 percent to 42 Kg/ton slag,
the adding amount of the iron and the phosphorus in the stirring agent is 100Kg per ton of slag,
the amount of coal powder in the stirring agent is 100Kg multiplied by 96% × (12/72) ÷ 78.6% ═ 20.4 Kg/ton of slag,
the amount of water glass used in the stirring agent is (100 + 20.4). times.3%. 3.6 Kg/ton of slag.
Example 2
Preparing a reduction iron-making complexing agent 2. Mixing iron ore concentrate powder, low-sulfur coal powder and water glass, adding water accounting for 13% of the raw materials by mass, fully stirring, carrying out extrusion forming, drying, crushing, screening to obtain first particles with the particle size of 6mm, wherein the mass ratio of the water glass is 4% of the total mass of the iron ore concentrate powder and the low-sulfur coal powder; the first granules and the second granules with the grain diameter of 6mm are mixed evenly.
Aiming at the steel slag components of the second plant: tfe24.74% (in slag as FeO), procured coal: 53.3 percent of fixed carbon and 20.21 percent of volatile matter, and iron concentrate powder (Fe) is used in the stirring agent3O4Content 91.4%).
The formula of the complexing agent needed to be added for 1 ton of molten slag reduction iron making is calculated as follows:
the coal grain consumption of the reducing agent is 247.4Kg multiplied by (12 divided by 72 divided by 53.3 percent divided by 77.4 Kg/ton of slag,
the dosage of the iron concentrate powder in the stirring agent is 100Kg per ton of slag,
the amount of coal powder in the stirring agent is 100Kg multiplied by 91.4% × (48 ÷ 232) ÷ 53.3% >, 35.5Kg per ton of slag,
the amount of water glass in the stirring agent is (100 + 35.5). times.4%. 5.4 Kg/ton of slag
Example 3
Preparing a reduction iron-making complexing agent 3. Mixing converter ash, low-sulfur coal powder and water glass, adding water accounting for 12% of the raw materials by mass, fully stirring, carrying out extrusion forming, drying, crushing and screening to obtain first particles with the particle size of 4mm, wherein the mass ratio of the water glass is 5% of the total mass of the converter ash and the low-sulfur coal powder, and the water glass, the iron concentrate powder and the low-sulfur coal powder are 200 meshes; the first granules and the second granules with the grain diameter of 5mm are mixed evenly.
Aiming at the steel slag components of the third plant: tfe27.12% (in slag as FeO), procured coal: 82% of fixed carbon and 2% of volatile matter, and converter ash (Fe) is used as the stirring agent2O3Content 72.86%).
The formula of the complexing agent needed to be added for 1 ton of molten slag reduction iron making is calculated as follows:
the amount of the reducing agent coal particles is 271.2Kg x (12/72)/82% >, 55.1 Kg/ton of slag,
the dosage of the converter ash in the stirring agent is 100Kg per ton of slag,
the amount of coal powder in the stirring agent is 100Kg multiplied by 77.4% × (36/160) ÷ 82% >, 21.2Kg per ton of slag,
the amount of water glass used in the stirring agent is (100 + 21.2). times.5%. 6.1 Kg/ton of slag.
Example 4
Preparing a reduction iron-making complexing agent 4. Mixing iron ore concentrate powder, low-sulfur coal powder and water glass, adding water accounting for 12% of the raw materials by mass, fully stirring, carrying out extrusion forming, drying, crushing and screening to obtain first particles with the particle size of 5mm, wherein the mass ratio of the water glass is 4% of the total mass of the iron ore concentrate powder and the low-sulfur coal powder, and the water glass is dehydrated water glass Na with the melting point of 790-810 DEG C2SiO3. Mixing the first granules and the second granules with the diameter of 5mm。
Aiming at the steel slag components of the butane factory: tfe9.81% (in slag as FeO), procured coal: 65.11% of fixed carbon and 15.32% of volatile matter, and iron ore concentrate powder (Fe) is used as the stirring agent3O4Content 91.4%).
The formula of the complexing agent needed to be added for 1 ton of molten slag reduction iron making is calculated as follows:
the coal grain consumption of the reducing agent is 98.1Kg x (12/72)/65.11% >, 77.4 Kg/ton slag,
the dosage of the iron concentrate powder in the stirring agent is 100Kg per ton of slag,
the amount of coal powder in the stirring agent is 100Kg multiplied by 91.4% × (48 divided by 232) ÷ 53.3% >, 25.1Kg per ton of slag,
the amount of water glass used in the stirring agent is (100 + 25.1). times.4%. 5 Kg/ton of slag.
Example 5
Preparing a reduction iron-making complexing agent 5. Mixing iron phosphorus, low-sulfur coal powder and water glass in steel rolling, adding water accounting for 12% of the raw materials by mass, fully stirring, carrying out extrusion forming, drying, crushing and screening to obtain first particles with the particle size of 5mm, wherein the mass ratio of the water glass is 3% of the total mass of the iron phosphorus and the low-sulfur coal powder in the steel rolling, and the water glass is dehydrated water glass Na with the melting point of 790-810 DEG C2SiO3. The first granules and the second granules with the grain diameter of 5mm are mixed evenly.
Aiming at the steel slag components of the Wu factory: tfe19.07% (in slag as FeO), procured coal: 74 percent of fixed carbon and 19.01 percent of volatile matter, and the steel rolling iron phosphorus (the FeO content is 95.4 percent) is used in the stirring agent.
The formula of the complexing agent needed to be added for 1 ton of molten slag reduction iron making is calculated as follows:
the dosage of the reducing agent coal particles is 190.7Kg x (12/72)/74% >, 43 Kg/ton slag,
the dosage of the iron concentrate powder in the stirring agent is 100Kg per ton of slag,
the amount of coal powder in the stirring agent is 100Kg multiplied by 95.4% × (12/72) ÷ 74% >, 21.5Kg per ton of slag,
the amount of water glass used in the stirring agent is (100 + 21.5). times.3%. 3.6 Kg/ton of slag.
Examples 1 to 5 were obtained by calculating the equivalent weight (unequal weight) of carbon oxygen in the reduced iron reaction based on various slag and raw material components. The practical application needs to be corrected and adjusted through heat balance calculation, and two kinds of coal are usually needed to meet the requirement.
Example 6
The complexing agent obtained in the embodiment 5 is utilized to carry out reduction ironmaking on ferronickel molten slag. Adding reducing ironmaking complexing agent carried by 0.5-1MPa compressed air into a steel slag molten pool by rotary spraying to perform reduced iron reaction, wherein the reaction process is performed in a semi-closed heat-preservation environment, and in the reduced iron reaction process, O is injected into a reduced iron system2Or preheated air, and the temperature of the molten pool is maintained between 1400 and 1500 ℃.
Table 1 is the experimental assay data:
the change of the components of the ferronickel slag before and after reducing iron can be seen, the TFe in the slag is reduced by 5.06 percent, and the iron reduction rate reaches 73 percent; the SiO2 in the slag was reduced by 0.27%, and a small amount of silicon was reduced.
The components of the reduced iron are as follows:
meanwhile, experiments show that the energy consumption for iron making is extremely low and the cost per ton of iron is less than 1000 yuan per ton of iron by utilizing the heat energy of the molten slag and the iron oxide raw material in the slag; emission reduction of solid slag emission is more than or equal to 73 percent/iron oxide content in slag, and production line strives to reach 90 percent; the complexing agent provided by the invention is used for reducing and ironmaking molten steel slag, the investment is very small, and the benefit is extremely high.
The above examples are intended to illustrate embodiments of the invention without going beyond the scope of the subject matter of the invention, the scope of protection of which is not limited by the examples. Unless otherwise specifically indicated, the materials and reagents used in the present invention are available from commercial products in the art.
Claims (10)
1. A reduction iron-making complexing agent is characterized in that: the iron ore granule is composed of a first granule and a second granule, wherein the first granule is a granule prepared from components including low-sulfur coal powder, water glass and iron ore granules, and the iron ore granules are selected from one or more of rotary furnace dust, steel rolling iron phosphorus or iron concentrate powder; the second particles are low-sulfur coal particles.
2. The reduction iron making composite agent according to claim 1, wherein: the particle sizes of the first particles and the second particles are both 2-6 mm.
3. The composite agent for reducing ironmaking according to claim 1 or 2, characterized in that the specific gravity of the low-sulfur coal dust and the iron ore particles in the first particle component is greater than the density of the molten steel slag, and the mass ratio of the water glass is 3-5% of the total mass of the iron ore particles and the low-sulfur coal dust.
4. The reduction iron making composite agent according to claim 3, wherein: the water glass in the first particle component is dehydrated water glass Na with the melting point of 790-810 DEG C2SiO3。
5. The method for preparing a reducing ironmaking complexing agent according to any one of claims 1 to 4, characterized in that: mixing iron ore particles, low-sulfur coal powder and water glass, adding water accounting for 11-13% of the mass of the raw materials, fully stirring, carrying out extrusion forming, drying, crushing, and screening to obtain first particles with the particle size of 2-6 mm; uniformly mixing the first particles and the second particles with the particle size of 2-6 mm.
6. Use of the reduction ironmaking composite according to any one of claims 1 to 4 for high temperature liquid molten steel slag reduction ironmaking.
7. Use according to claim 6, characterized in that: the reduction iron-making complexing agent is used as a reducing agent, a binder, a curing agent, a stirring agent, a catalyst, a diluent and a heating agent.
8. A method for reducing and ironmaking by utilizing molten steel slag is characterized in that: the composite agent for reducing iron making according to any one of claims 1 to 4 is added into a molten steel slag molten pool to perform a reduced iron reaction, the reaction process is performed in a semi-closed heat-preserving environment, and the temperature of the molten pool is maintained at 1400 ℃ to 1500 ℃.
9. The method of claim 8, wherein: in the process of reducing iron, injecting O into the reducing iron system2Or preheated air.
10. The method according to claim 8 or 9, wherein the reducing iron-making complexing agent is carried by 0.5-1MPa compressed air and added into the steel slag molten pool by rotary spraying.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115323094A (en) * | 2022-08-18 | 2022-11-11 | 郭瑛 | Molten steel slag reduction iron-making system and iron-making method |
| CN115323094B (en) * | 2022-08-18 | 2023-12-22 | 郭瑛 | Molten steel slag reduction iron-making system and iron-making method |
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