CN115494895A - Method and device for simulating blast furnace molten iron carburization - Google Patents
Method and device for simulating blast furnace molten iron carburization Download PDFInfo
- Publication number
- CN115494895A CN115494895A CN202211138509.3A CN202211138509A CN115494895A CN 115494895 A CN115494895 A CN 115494895A CN 202211138509 A CN202211138509 A CN 202211138509A CN 115494895 A CN115494895 A CN 115494895A
- Authority
- CN
- China
- Prior art keywords
- container
- coke
- molten iron
- heating
- blast furnace
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
Abstract
The invention provides a method and a device for simulating blast furnace molten iron carburization. The method for simulating the carburizing of the molten iron in the blast furnace comprises the following steps: a) Placing iron ore and first coke into a first vessel, and placing second coke into a second vessel; b) Heating the first container and the second container, melting the iron ore in the first container into molten iron, wherein the bottom of the first container is provided with a hole, and the molten iron drops onto second coke in the second container from the hole; c) After the heating is stopped, the interface carburization of the solidified molten iron and the second coke is the simulated carburizing condition of the molten iron in the blast furnace. The method can solve the problem that the carburization change of the molten iron in the production process of the blast furnace is difficult to accurately simulate in the prior art, and is suitable for the technical field of iron-making production.
Description
Technical Field
The invention relates to an iron-making production technology, in particular to a method and a device for simulating blast furnace molten iron carburization.
Background
With the development of the coal injection technology, the quality of iron ore is reduced, the high-quality coking coal resources are exhausted increasingly, and the environmental situation is more severe, the contradiction between the higher requirement of the coke quality and the gradual deterioration of the coke quality is more prominent. The modern blast furnace is continuously developed towards the large-scale furnace volume and high-efficiency production, and the importance of long service life and safety of the blast furnace is gradually shown. The hearth burnthrough accident sometimes occurs, and the main reason is that the refractory bricks are corroded by unsaturated molten iron. How to effectively improve the carbon saturation of the molten iron is an important measure for ensuring the safety and long service life of the blast furnace, and has important significance for subsequent negative energy steelmaking.
Coke is a high strength, porous material made from coal heated to 1100 ℃ under an inert atmosphere and can be considered as a heterogeneous composite material consisting of organic carbon, inorganic minerals and pores. The carburizing process of coke in a blast furnace into metallic iron is an important link of iron-making production. The carburizing process of the molten iron mainly comprises two modes, one mode is that carbon atoms in coke are separated from a carbon matrix and are diffused into the molten iron through an interface of the coke and the molten iron to be consumed, and the consumption is called carburizing reaction consumption. The other is that the carbon atoms in the coke and the iron atoms in the molten iron react to generate Fe 3 C is consumed. Because the Gibbs free energy of carbon atom carburization reaction in the carbon matrix is far less than that of Fe at the same temperature 3 The gibbs free energy of the reaction of formation of C, and therefore the molten iron carburization process in this test is mainly a process in which coke is consumed by contact with high-temperature molten iron.
In the position of a reflow zone in a blast furnace, the mass fraction of carbon in the iron-carbon alloy is lower than 4.3 percent, and the melting temperature of molten iron is gradually reduced along with the progress of the carburizing process, so that the softening and dropping of metal iron are accelerated; then molten iron is accumulated at the position of the hearth, and coke at the lower part of the blast furnace is further carburized to form pig iron with certain quality. At present, the test methods for studying the hot metal carburization mainly include a cover method, a fixed/rotating cylinder method, a rotating disc method, a blowing method, a sitting drop method and the like, and specific test methods are shown in fig. 1 (a) to 1 (f). Firstly, heating reduced iron powder into molten iron, and adding coke on the surface of the molten iron in the form of powder or particles by a covering method (shown in figure 1 (a)); the fixed/rotary cylindrical method is to make the coke into a carbon rod, then put the carbon rod into the molten iron and rotate at different speeds (as shown in fig. 1 (b)); the rotary disk method is a method in which coke is made into a carbonaceous disk, and then the disk is brought into contact with the surface layer of molten iron and rotated at different speeds (see fig. 1 (c)); the fixed cylinder method is to make the coke into a carbon rod, and then directly insert the carbon rod into the molten iron (as shown in fig. 1 (d)); the blowing method is that coke particles or powder are directly blown into molten iron from a pipe under the action of inert carrier gas (as shown in figure 1 (e)); the sessile drop method produces coke as a cylindrical substrate and then drops metal on the cylindrical substrate (as shown in fig. 1 (f)).
The 6 experimental methods for the research on the carburization of the molten iron are directly used molten iron prepared from reduced iron powder, and the molten iron has a certain difference from the molten iron produced by a blast furnace in daily life, so that the carburization change of the molten iron in the normal production process of the blast furnace cannot be truly simulated. This is because the molten iron produced in the blast furnace is a slag-iron mixture, and various elements contained therein have a significant influence on the carburizing reaction of the coke in the blast furnace. Therefore, the method for simulating the carburization of the blast furnace molten iron and the molten iron is developed, and has important value for iron-making production.
Disclosure of Invention
The invention mainly aims to provide a method and a device for simulating the carburizing of molten iron in a blast furnace, so as to solve the problem that the carburizing change of the molten iron in the production process of the blast furnace is difficult to accurately simulate in the prior art.
In order to achieve the above object, according to a first aspect of the present invention, there is provided a method for simulating carburizing of molten iron in a blast furnace, the method comprising: a) Placing iron ore and first coke into a first vessel, and placing second coke into a second vessel; b) Heating the first container and the second container, melting the iron ore in the first container into molten iron, wherein the bottom of the first container is provided with a hole, and the molten iron drops onto second coke in the second container from the hole; c) And after the heating is stopped, the interface of the solidified molten iron and the second coke is carburized, namely the condition of simulating the carburizing of the molten iron in the blast furnace.
Further, in a), the first coke comprises a third coke and a fourth coke; placing third coke into the first container, placing iron ore on the third coke after the third coke is flattened, and placing fourth coke on the iron ore after the third coke is flattened; preferably, the mass ratio of the third coke, the iron ore and the fourth coke is 60-100g:450-550g:60-100g; more preferably 75 to 85g:495g-505g:75-85g; more preferably 80g:500g:80g of the total weight of the mixture; preferably, the pressure of the flattening is 1.98 to 2.02kg/cm 2 。
Further, in a), the first coke and the iron ore are dried before being placed, wherein the drying comprises blast drying at 95-105 ℃, and the drying time is more than or equal to 2 hours; preferably, the particle size of the iron ore is 10 to 12.5mm; preferably, the particle size of the first coke is 10.0mm to 12.5mm; preferably, the particle size of the second coke is 55mm to 83mm.
Further, in b), the heating of the first container comprises: the temperature is between room temperature and 900 ℃, and the heating rate is 10 ℃/min; 900-1100 ℃, and the heating rate is 2 ℃/min; 1100-1600 ℃, and the heating rate is 5 ℃/min; when the temperature of the first container reaches 1580 ℃ and then 30min, the heating is stopped.
Further, in b), when the temperature of the first container is less than 500 ℃, the first container is protected by using a first nitrogen atmosphere; when the temperature of the first container is more than or equal to 500 ℃, switching the first nitrogen atmosphere into a reducing gas atmosphere; preferably, the reducing gas atmosphere comprises 30% (v/v) CO and 70% (v/v) N 2 (ii) a Preferably, the ventilation amount of the first nitrogen atmosphere is 4.9-5.1L/min; preferably, the aeration rate of the reducing gas atmosphere is 4.9 to 5.1L/min.
Further, in b), the temperature of a dripping path is 1600-2000 ℃ in the dripping process of molten iron; preferably, the heating temperature of the second vessel is 1600 ℃ to 2000 ℃.
Further, in c), the first container is protected by a second nitrogen atmosphere, and the second nitrogen atmosphere is removed after the temperature of the first container is reduced to 200 ℃; preferably, the second nitrogen atmosphere has an aeration rate of 1 to 3L/min, more preferably 2L/min.
In order to achieve the above object, according to a second aspect of the present invention, there is provided an apparatus for simulating carburizing of molten iron in a blast furnace, the apparatus comprising a first container, a second container, a first heating module, and a second heating module; the bottom of the first container is provided with a hole, and the first container and the hole are arranged above the second container; a first coke and iron ore are placed in the first container, and a second coke is placed in the second container; the first heating module is used for heating the first container, and the second heating module is used for heating the second container.
Further, the device also comprises an atmosphere adjusting device which is used for adjusting the gas atmosphere of the first container; preferably, the first container comprises a graphite crucible having a hole at the bottom.
Further, a third heating module is arranged between the first container and the second container and used for heating the space between the first container and the second container.
By applying the technical scheme of the invention, the method for simulating the carburizing of the blast furnace molten iron is utilized, the iron ore and the first coke are heated together, the actual situation is the same as that in the blast furnace ironmaking, the obtained molten iron is not pure iron but is a slag-iron mixture, and the generation process and the molten iron components of the molten iron in the blast furnace can be accurately simulated, so that the process and the result of the carburizing of the molten iron are accurately simulated. By utilizing the method, the carburization change of the molten iron in the actual production of the blast furnace is accurately simulated, and the research and the production of blast furnace ironmaking are facilitated.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram showing a test method of a prior art hot metal carburization study according to the background of the present invention; wherein (a) represents a masking method; (b) represents a rotating cylinder method; (c) represents a rotating disk method; (d) represents a fixed cylinder method; (e) an infiltration blowing method; (f) represents a sitting drop method.
Figure 2 shows a schematic diagram of an apparatus for simulating carburizing of molten iron in a blast furnace according to embodiment 1 of the present invention. Wherein the figures include the following reference numerals: 1. n is a radical of 2 A mass flow controller; 2. n is a radical of 2 A steel cylinder; 3. a CO mass flow controller; 4. a CO steel cylinder; 5. a gas mixing cylinder; 6. a temperature thermocouple; 7. a load weight; 8. a gas outlet; 9. a U-shaped silicon-molybdenum rod; 10. a heat insulating collar; 11. a corundum protective tube; 12. a graphite straight pipe; 13. sealing sleeves; 14. a gas inlet; 15. heating furnace; 16. an electronic balance; 17. a differential pressure transmitter; 18. sealing the box; 19. a temperature control thermocouple; 20. a graphite crucible; 21. a graphite pressure head; 22. a graphite pressure bar; 23. a displacement transmitter; 24. a master control system; 25. a silicon-molybdenum rod; 26. a furnace door; 27. a drip receiving crucible.
FIG. 3 is a view showing inner samples before and after a drip receiving crucible test according to example 1 of the present invention; wherein A represents the coke in the trickle crucible before testing; b represents the molten iron dropped and cooled in the dropping crucible after the test.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
As mentioned in the background art, the existing test method for iron water carburization research only changes the contact mode of coke and iron water, does not simulate real iron water components, cannot truly simulate the carburization change of iron water in the normal production process of a blast furnace, and cannot explore the influence of the change of the blast furnace burden structure on iron water carburization. The prior art cannot provide a method which can simulate the actual carburization of molten iron in a blast furnace. Therefore, the inventors of the present application have attempted to develop a method capable of simulating the carburization of molten iron in a blast furnace, and have proposed a series of protection schemes of the present application.
In a first exemplary embodiment of the present application, there is provided a method for simulating carburizing of molten iron in a blast furnace, the method comprising: a) Placing iron ore and first coke into a first vessel, and placing second coke into a second vessel; b) Heating the first container and the second container, melting the iron ore in the first container into molten iron, wherein the bottom of the first container is provided with a hole, and the molten iron drops onto second coke in the second container from the hole; c) And after the heating is stopped, the interface of the solidified molten iron and the second coke is carburized, namely the condition of simulating the carburizing of the molten iron in the blast furnace.
After the iron ore and the first coke are placed in the first vessel, the first vessel is heated, the first coke is combusted, and the iron ore is melted to form molten iron and is in contact with the coke, so that a process of producing molten iron in a blast furnace can be simulated. After iron ore is melted to form molten iron, the molten iron drips from the hole in the bottom of the first container and drips into the second container below the hole. And a second coke is placed in the second container, molten iron drops to the surface of the coke, the molten iron can be simulated to be accumulated at the position of a blast furnace hearth, and the coke at the lower part of the blast furnace further carburizes the molten iron. The molten iron in the blast furnace belongs to a slag-iron mixture, and various elements contained in the molten iron have obvious influence on the carburizing reaction of coke in the blast furnace. The molten iron obtained by the above method has complex components, rather than simply molten iron. The raw materials used in the method can be flexibly adjusted, and the influence of different raw materials on the molten iron carburization can be simulated by changing the used raw materials to be the same as the raw materials actually used in industrial production, so that the process and the result of the molten iron carburization in the blast furnace can be simulated more accurately.
In the method for simulating the blast furnace molten iron carburization, the molten iron source is high-temperature molten iron prepared by reducing ores according to the actual charging structure of the blast furnace. Compared with the prior art, the method can better simulate the blast furnace smelting practice. Meanwhile, in the actual production process of blast furnace smelting, the carbon content of the molten iron is closely related to the raw fuel condition, and the carbon content in the molten iron is different according to different charging structures, so that the carburization behavior of the molten iron prepared according to the charging structure of the blast furnace in the method is more practical. In addition, the prior art has requirements on the shape, size and ash content of carbon materials, and the used molten iron is greatly different from molten iron produced by actual blast furnace ironmaking and does not conform to the actual blast furnace smelting.
In a preferred embodiment, in a), the first coke comprises a third coke and a fourth coke; placing third coke into the first container, placing iron ore on the third coke after the third coke is flattened, and placing fourth coke on the iron ore after the third coke is flattened; preferably, the mass ratio of the third coke, the iron ore and the fourth coke is 60-100g:450-550g:60-100g; more preferably 75 to 85g:495g-505g:75-85g; more preferably 80g:500g:80g of the total weight of the mixture; preferably, the pressure of the flattening is 1.98 to 2.02kg/cm 2 。
The coke in contact with the iron ore can play roles in reducing and carburizing, and the third coke below the iron ore can play roles in promoting gas exchange, adjusting the height of the iron ore and ensuring molten iron to drop. By means of the layered arrangement of the third coke, the iron ore and the fourth coke, the distribution of the iron ore in the blast furnace can be well simulated, and therefore simulation of molten iron generated in the blast furnace is achieved.
The first coke, the second coke, the third coke, and the fourth coke are all coke, and are distinguished by the terms "first", "second", "third", and "fourth", and are not sequentially distinguished, but are only for distinguishing the position of the coke. Other expressions may be used, such as a first vessel coke, which may also be referred to as a first upper layer coke, a first lower layer coke, etc., depending on the distribution location, and a second vessel coke.
In a preferred embodiment, in a), the first coke and the iron ore are dried before being placed, and the drying comprises blowing drying at 95-105 ℃, wherein the drying time is more than or equal to 2 hours; preferably, the particle size of the iron ore is 10 to 12.5mm; preferably, the particle size of the first coke is 10.0mm to 12.5mm; preferably, the particle size of the second coke is 55mm to 83mm.
In the above method, the raw materials are dried before the first coke and the iron ore are placed, so as to prevent moisture from being introduced into the reaction, thereby affecting the effect of iron making and the simulation of the conditions in the blast furnace. The particle size of the iron ore is 10-12.5 mm, the iron ore with the particle size being too small is prevented from falling from the hole of the first container, and the iron ore with the unit weight can have a larger surface area in the particle size range, so that the subsequent heating melting and reduction are facilitated. The particle size of the first coke is 10mm to 12.5mm. Too small a particle of coke may block gas permeability and affect gas smooth-going. If the particle size of the coke is too large, the reduction rate decreases, increasing the production time. Controlling the particle size of the coke within this range not only provides good permeability but also provides a high reduction rate.
In a preferred embodiment, in b), the heating of the first container comprises: the temperature is between room temperature and 900 ℃, and the heating rate is 10 ℃/min; 900-1100 ℃, and the heating rate is 2 ℃/min; 1100-1600 ℃, and the heating rate is 5 ℃/min; the heating was stopped 30min after the first vessel (including the iron ore and coke in the first vessel) reached 1580 ℃.
The above-described heating of the first container comprises three stages. The first stage is from room temperature to 900 ℃, and the heating rate is 10 ℃/min; in the second stage, the temperature is increased at the rate of 2 ℃/min from 900 ℃ to 1100 ℃; in the third stage, the temperature is raised from 1100 ℃ to 1600 ℃ at a rate of 5 ℃/min, and the temperature is kept from rising after reaching 1600 ℃. In the third stage, the time is counted when the temperature reaches 1580 ℃, and the heating is stopped after 30 min.
In a preferred embodiment, in b), the first container is protected with a first nitrogen atmosphere at a temperature of < 500 ℃; when the temperature of the first container is more than or equal to 500 ℃, switching the first nitrogen atmosphere into a reducing gas atmosphere; preferably, the reducing gas atmosphere comprises 30% (v/v) CO and 70% (v/v) N 2 (ii) a Preferably, the ventilation amount of the first nitrogen atmosphere is 4.9-5.1L/min; preferably, the aeration rate of the reducing gas atmosphere is 4.9 to 5.1L/min.
In a preferred embodiment, in c), the first container is protected with a second nitrogen atmosphere, and the second nitrogen atmosphere is removed after the temperature of the first container is reduced to 200 ℃; preferably, the second nitrogen atmosphere has an aeration rate of 1 to 3L/min, more preferably 2L/min.
By using the above reaction conditions, reduction smelting of iron ore and carburizing of molten iron can be achieved in the first vessel, and the reaction principle and phenomenon are very similar to those of the reaction occurring in the blast furnace. The method can simulate the actual production condition of the blast furnace, the reduction condition of the iron ore and the carburizing condition of the molten iron, and can simulate and subsequently detect the carburizing in the first container or the second container, thereby obtaining more real data.
In a preferred embodiment, the second vessel is heated to a temperature of 1600 ℃ to 2000 ℃.
In a preferred embodiment, in b), the temperature of the dropping path is 1600 ℃ to 2000 ℃ during the dropping process of the molten iron.
In the actual production of the blast furnace, a large amount of oxygen-enriched hot air is blown into the blast furnace from the bottom of the blast furnace to reach the top of the blast furnace to provide oxygen and heat. In the reduction of iron ore at the top of a blast furnace, complex physical and chemical reactions occur. There is a large difference in the temperature of the respective portions in the blast furnace. The temperature of the second container and/or the molten iron dropping path can be flexibly adjusted, so that different temperatures of molten iron dropping behind in different environments in the blast furnace can be more accurately simulated, and the simulation of molten iron carburization is more accurate.
In the device, the first container corresponds to Gao Luna reflow belt, and the second container corresponds to the lower dropping belt area of the blast furnace reflow belt. In the actual production of the blast furnace, the temperature of the dripping zone area at the lower part of the reflow zone is higher than that of the reflow zone and is more than 1600-2000 ℃. The device can simulate the actual condition of blast furnace smelting by setting different temperatures.
The material distribution of the blast furnace in the actual production is that coke and ore are alternately arranged in layers, and a plurality of layers are arranged. In the method for simulating the blast furnace molten iron carburization, the same raw materials as those used in the blast furnace are used, the proportion of the raw materials is ensured to be the same as that of the blast furnace, and the raw materials are not required to be completely the same as those of the blast furnace burden distribution in multilayer arrangement.
In a second exemplary embodiment of the present application, an apparatus for simulating carburizing of blast furnace molten iron is provided, the apparatus comprising a first vessel, a second vessel, a first heating module, and a second heating module; the bottom of the first container is provided with a hole, and the first container and the hole are positioned above the second container; a first coke and iron ore are placed in the first container, and a second coke is placed in the second container; the first heating module is used for heating the first container, and the second heating module is used for heating the second container.
In a preferred embodiment, the apparatus further comprises atmosphere adjusting means for adjusting the atmosphere in which the first container is placed; preferably, the first container comprises a graphite crucible having a hole at the bottom.
In a preferred embodiment, the apparatus further comprises a third heating module for heating the space between the first container and the second container.
By utilizing the method and the device, the process conditions of blast furnace ironmaking can be simulated, and real molten iron can be obtained in a simulated manner, so that the carburization change of the molten iron in the normal production process of the blast furnace can be simulated, and more practical and usable production data can be provided for enterprises.
The advantageous effects of the present application will be explained in further detail below with reference to specific examples.
Example 1
Selecting actual furnace burden charged in a blast furnace on site, and screening pellets to obtain an experimental sample with the particle size range of 10.0-12.5 mm; the natural lump ore and the sintered ore are screened out to obtain a part larger than 12.5mm, the part is crushed to ensure that the whole part passes through a 16.0mm sieve, then the parts smaller than 12.5mm are combined, and an experimental sample with the granularity range of 10.0mm-12.5mm is obtained by sieving. And uniformly mixing the obtained iron ore sample according to the actual charging structure of the furnace, wherein the sample is not less than 3000g. Sampling and preparing according to the GB/T1997, crushing and screening to obtain test samples with the particle size range of 10.0mm-12.5mm of not less than 600g.
3000g of iron ore sample and 600g of coke sample are placed in a digital display air drying oven at 105 +/-5 ℃ for drying for not less than 2h actually, cooled to room temperature and transferred into a dryer for later use.
The same sample was measured at least 2 times. The dried sample mass was 500 g. + -. 2g, and the coke sample mass was 160 g. + -. 2g. Stone (stone)The bottom of the graphite crucible (i.e. the first container) is provided with a hole, 80g of coke is flatly placed at the bottom of the graphite crucible, then the crucible is placed on a sample flattening thickness gauge, and a load is started to apply pressure to the sample by 2kg/cm 2 ±0.02kg/cm 2 After the sample is pressed and flattened, 500g +/-2 g of iron ore sample is placed on the upper surface of the bottom coke particles, and the flattening thickness gauge is started again to apply 2kg/cm to the sample 2 ±0.02kg/cm 2 Finally, 40g of coke is placed on the iron ore sample under pressure, and a flattening thickness gauge is started to flatten the whole sample.
And (3) putting the graphite crucible into a high-temperature molten drop furnace, namely, heating the graphite crucible by using the high-temperature molten drop furnace and controlling the atmosphere. Sealing the upper opening of the graphite crucible, and introducing 5L/min N into the high-temperature sealing system before the test 2 And observing the differential pressure display value, and if the differential pressure is not less than 20000Pa, the test is qualified, and the formal test can be started.
Putting the graphite crucible into a high-temperature molten drop furnace, and starting temperature programming: the temperature is between room temperature and 900 ℃, and the heating rate is 10 ℃/min; 900-1100 ℃, and the heating rate is 2 ℃/min; 1100-1600 ℃, and the heating rate is 5 ℃/min; when the temperature of the sample reached 1580 ℃, the sample was kept for 30min, and the test was finished. Introducing nitrogen before the furnace temperature is 500 ℃, switching to 30% (v/v) CO and 70% (v/v) N reducing gas at the flow rate of 5L/min and at the temperature of 500 DEG C 2 The flow rate is 5L/min +/-0.1L/min, nitrogen is introduced after the test is finished, the flow rate is 2L/min, and the introduction of nitrogen is stopped when the temperature of a material layer is lower than 200 ℃.
Three silicon-molybdenum rod heating bodies are additionally arranged on the lower portion of the high-temperature molten drop furnace, a molten iron dropping interval and a drop bearing crucible (namely a second container) are uniformly surrounded, the temperature of the three heating bodies is set to be 2000 ℃ during a test, the drop bearing crucible and the dropping interval are heated, so that the molten iron is always kept in a liquid state in the process that the molten iron drops to the drop bearing crucible, and the actual situation of the blast furnace smelting process is simulated. The apparatus used in example 1 to simulate carburizing of blast furnace molten iron is shown in fig. 2.
And cooling the material layer to room temperature, taking out the coke in the drip-bearing crucible, and detecting and observing the carburization condition of the iron-carbon interface. Internal samples before and after the drip crucible test are shown in fig. 3. Wherein A represents coke in the drip pan prior to testing; b represents the molten iron dropped and cooled in the dropping crucible after the test.
And (4) detecting the content of the components, particularly the carbon content, in the molten iron dripped and cooled in the dripping crucible after the test shown as B in the figure 3, wherein the detection method is shown in GB/T223.86-2009. And comparing the simulated actual blast furnace molten iron with the simulated actual blast furnace molten iron, wherein the result shows that the simulated molten iron is similar to the actual blast furnace molten iron in composition, and the carburization change of the molten iron in the normal production process of the blast furnace can be simulated.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects: by utilizing the method for simulating the carburizing of the molten iron in the blast furnace, the generation process and the components of the molten iron in the blast furnace can be accurately simulated, so that the process and the result of the carburizing of the molten iron can be accurately simulated. And the method can be correspondingly adjusted according to the change of the raw materials used in the actual production, can overcome the problem that different batches of raw materials influence the simulation accuracy, and is favorable for the research and the actual production of blast furnace iron making.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method for simulating blast furnace molten iron carburization, characterized by comprising:
a) Placing iron ore and first coke into a first vessel, and placing second coke into a second vessel;
b) Heating the first container and the second container to melt the iron ore in the first container into molten iron, wherein the bottom of the first container is provided with a hole, and the molten iron drops onto the second coke in the second container from the hole;
c) And after the heating is stopped, the interface carburization of the solidified molten iron and the second coke is the simulated carburizing condition of the blast furnace molten iron.
2. The method of claim 1 wherein in a), the first coke comprises a third coke and a fourth coke;
placing the third coke into the first container, flattening the third coke, placing the iron ore on the third coke, and flattening the third coke and placing the fourth coke on the iron ore;
preferably, the mass ratio of the third coke, the iron ore and the fourth coke is 60-100g:450-550g:60-100g; more preferably 75 to 85g:495g-505g:75-85g; more preferably 80g:500g:80g of the total weight of the mixture;
preferably, the pressure for flattening is 1.98-2.02 kg/cm 2 。
3. The method according to claim 1, wherein in the step a), the first coke and the iron ore are dried before being placed, the drying comprises blast drying at 95-105 ℃, and the drying time is more than or equal to 2 hours;
preferably, the particle size of the iron ore is 10-12.5 mm;
preferably, the particle size of the first coke is 10.0mm to 12.5mm;
preferably, the particle size of the second coke is 55mm to 83mm.
4. The method according to claim 1, wherein in b),
heating the first container comprises: the temperature is between room temperature and 900 ℃, and the heating rate is 10 ℃/min; 900-1100 ℃, and the heating rate is 2 ℃/min; 1100-1600 ℃, and the heating rate is 5 ℃/min; and stopping heating after the first container reaches 1580 ℃ for 30 min.
5. The method according to claim 3, wherein in b),
protecting the first container by utilizing a first nitrogen atmosphere when the temperature of the first container is less than 500 ℃;
when the temperature of the first container is more than or equal to 500 ℃, switching the first nitrogen atmosphere into a reducing gas atmosphere;
preferably, the reducing gas atmosphere comprises 30% (v/v) CO and 70% (v/v) N 2 ；
Preferably, the ventilation amount of the first nitrogen atmosphere is 4.9-5.1L/min;
preferably, the ventilation amount of the reducing gas atmosphere is 4.9 to 5.1L/min.
6. The method according to claim 1, wherein in the b), the temperature of a dropping path is 1600-2000 ℃ during the dropping process of the molten iron;
preferably, the heating temperature of the second container is 1600 ℃ to 2000 ℃.
7. The method according to claim 1, wherein in c), the first container is protected by a second nitrogen atmosphere, and the second nitrogen atmosphere is removed after the temperature of the first container is reduced to 200 ℃;
preferably, the second nitrogen atmosphere has an aeration rate of 1-3L/min, more preferably 2L/min.
8. An apparatus for simulating blast furnace molten iron carburization is characterized by comprising a first container, a second container, a first heating module and a second heating module;
the bottom of the first container is provided with a hole, and the first container and the hole are arranged above the second container;
a first vessel having a first coke and iron ore disposed therein,
a second coke is placed in the second vessel;
the first heating module is for heating the first container,
the second heating module is used for heating the second container.
9. The apparatus of claim 8, further comprising atmosphere adjusting means for adjusting a gas atmosphere in which the first container is placed;
preferably, the first container comprises a graphite crucible having a hole at the bottom.
10. The apparatus of claim 8, wherein a third heating module is provided between the first container and the second container for heating the space between the first container and the second container.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211138509.3A CN115494895A (en) | 2022-09-19 | 2022-09-19 | Method and device for simulating blast furnace molten iron carburization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211138509.3A CN115494895A (en) | 2022-09-19 | 2022-09-19 | Method and device for simulating blast furnace molten iron carburization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115494895A true CN115494895A (en) | 2022-12-20 |
Family
ID=84471011
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211138509.3A Pending CN115494895A (en) | 2022-09-19 | 2022-09-19 | Method and device for simulating blast furnace molten iron carburization |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115494895A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB156643A (en) * | 1918-04-27 | 1921-12-22 | Koppers Gmbh Heinrich | Improvements in the method of, and apparatus for, operating smelting and reducing furnaces, more particularly iron smelting blast furnaces |
| JPS5464033A (en) * | 1977-10-31 | 1979-05-23 | Shimadzu Corp | Drip type carburization furnace |
| CN101104873A (en) * | 2007-07-31 | 2008-01-16 | 东北大学 | Method for fusing reducing iron by employing iron ore hot pressing carbon-containing agglomerate |
| CN107543777A (en) * | 2017-10-11 | 2018-01-05 | 辽宁科技大学 | The test device and method of blast furnace ferrous furnace charge soft melting dropping characteristic |
| CN108279246A (en) * | 2017-12-20 | 2018-07-13 | 北京科技大学 | A kind of experimental rig and method of evaluation refractory material anti-hot metal erosion energy |
| CN109991125A (en) * | 2019-05-16 | 2019-07-09 | 重庆大学 | A kind of pressure swing type soft melting dropping performance test method and equipment |
| CN113624794A (en) * | 2021-07-05 | 2021-11-09 | 北京科技大学 | Test device and method for evaluating molten iron corrosion resistance of blast furnace carbon brick |
| CN113791108A (en) * | 2021-09-17 | 2021-12-14 | 苏州大学 | Method for measuring reflow dripping performance of iron-containing raw material |
-
2022
- 2022-09-19 CN CN202211138509.3A patent/CN115494895A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB156643A (en) * | 1918-04-27 | 1921-12-22 | Koppers Gmbh Heinrich | Improvements in the method of, and apparatus for, operating smelting and reducing furnaces, more particularly iron smelting blast furnaces |
| JPS5464033A (en) * | 1977-10-31 | 1979-05-23 | Shimadzu Corp | Drip type carburization furnace |
| CN101104873A (en) * | 2007-07-31 | 2008-01-16 | 东北大学 | Method for fusing reducing iron by employing iron ore hot pressing carbon-containing agglomerate |
| CN107543777A (en) * | 2017-10-11 | 2018-01-05 | 辽宁科技大学 | The test device and method of blast furnace ferrous furnace charge soft melting dropping characteristic |
| CN108279246A (en) * | 2017-12-20 | 2018-07-13 | 北京科技大学 | A kind of experimental rig and method of evaluation refractory material anti-hot metal erosion energy |
| CN109991125A (en) * | 2019-05-16 | 2019-07-09 | 重庆大学 | A kind of pressure swing type soft melting dropping performance test method and equipment |
| CN113624794A (en) * | 2021-07-05 | 2021-11-09 | 北京科技大学 | Test device and method for evaluating molten iron corrosion resistance of blast furnace carbon brick |
| CN113791108A (en) * | 2021-09-17 | 2021-12-14 | 苏州大学 | Method for measuring reflow dripping performance of iron-containing raw material |
Non-Patent Citations (3)
| Title |
|---|
| 华福波等: "焦炭床内铁水渗碳行为", 华福波等, vol. 31, no. 7, pages 612 - 619 * |
| 吴胜利;庹必阳;张丽华;武建龙;孙颖;: "预还原含铁炉料在高炉内的软熔滴落行为", 钢铁, no. 05 * |
| 李长荣,邓守强,施月循: "高炉铁水滴落过程的渗碳研究", 贵州工业大学学报(自然科学版), no. 04 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8211204B2 (en) | Self-fluxing pellets for blast furnace and method for manufacturing the same | |
| CN101936979A (en) | Strength determination method and device for reacted blast furnace coke | |
| US20210010753A1 (en) | Device And Method For Measuring Softening And Melting Performances Of Iron Ore In Blast Furnace Under Reducing Condition | |
| CN105543633B (en) | A kind of method of utilization crystal scrap silicon smelting duriron | |
| Ujisawa et al. | Subjects for achievement of blast furnace operation with low reducing agent rate | |
| KR20220157507A (en) | Method for manufacturing liquid pig iron with DRI products | |
| CN101743330B (en) | Process for producing molten iron | |
| CN110346538A (en) | A kind of continuous transformation of high temperature becomes iron ore performance measurement method under atmospheric condition | |
| Takeuchi et al. | Evaluation of sinter quality for improvement in gas permeability of blast furnace | |
| CN115494895A (en) | Method and device for simulating blast furnace molten iron carburization | |
| JPH0733528B2 (en) | Blast furnace operation method | |
| CN217237920U (en) | Powdery iron ore direct reduction and comprehensive thermal analysis and determination system | |
| CN111220643A (en) | Method for measuring high-temperature interaction reactivity between iron-containing furnace charges of blast furnace | |
| KR20040057191A (en) | A method for making molten iron by using hot compaction of fine dri and calcined additives in non-coking coal based iron making process | |
| Li et al. | Effect of briquetting pressure on the properties, reduction behavior, and reduction kinetics of cold-bonded briquette prepared from return fines of sinter | |
| CN113916676A (en) | Device and method for testing high-temperature strength of iron-making raw material | |
| CN113362904B (en) | Method for detecting shape of swirl zone of blast furnace tuyere | |
| JP3589016B2 (en) | Blast furnace operation method | |
| JP2970460B2 (en) | Blast furnace operation method | |
| RU2813429C1 (en) | Method of producing liquid cast iron from dri-product | |
| WO2024070135A1 (en) | Iron ore pellet production method | |
| KR100293203B1 (en) | Pseudo reduction method for evaluating high temperature reducing property of iron ore in shaft type reduction furnace, reducing characteristics evaluation method and pseudo reduction apparatus | |
| Lee | Reduction and softening/melting behaviour of olivine pellet in the experimental blast furnace | |
| CN116829739A (en) | Pig iron production method | |
| Shiau | Real-time indices focus on slag flowability and coke strength for blast furnace operation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |