CN115083536A - Method for calculating different time solubility of iron ore in high-temperature liquid slag - Google Patents
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Abstract
The invention discloses a method for calculating the solubility of iron ores in high-temperature liquid slag at different time periods, and belongs to the technical field of smelting production of liquid molten iron by a non-blast furnace ironmaking smelting reduction process in ferrous metallurgy. The calculation method comprises the following steps: s1, determining the initial diameter of the iron ored(ii) a S2, determining the temperature of the high-temperature liquid slagT(ii) a S3, substituting the parameters into a formula; s4, obtaining a calculation equation of the change of the iron ore dissolution degree along with time; and S5, inputting the melting time, and obtaining the degree of dissolution of the iron ore in the high-temperature liquid slag corresponding to the melting time through calculation. The method has the advantages of simple determination mode of the required process parameters, accurate calculation mode and capability of effectively guiding the adding flow of the raw fuels such as iron ore, reducing agent, flux and the like in the smelting reduction process in timeAnd the components are matched with each other, so that the production rhythm of the smelting reduction process is optimized.
Description
Technical Field
The invention belongs to the technical field of liquid molten iron production by smelting of a non-blast furnace ironmaking smelting reduction process in ferrous metallurgy, and relates to a method for calculating the degree of fusion of iron ore in high-temperature liquid slag at different times.
Background
Smelting reduction is a general term for a type of process in non-blast furnace ironmaking process in the field of ferrous metallurgy, and refers to all methods for producing liquid molten iron without blast furnace smelting. In the smelting reduction smelting process, the process that sinter ore, pellet ore, lump ore or powder ore with certain pre-reduction degree or without pre-reduction is directly sprayed or falls into a high-temperature liquid iron slag molten pool under the action of gravity is involved, the iron ore is firstly melted into the slag in the high-temperature liquid slag, and meanwhile, the melted carbon in the iron slag and oxides in the slag are subjected to reduction reaction, so that the smelting reduction process is completed.
In the actual production process, because the change of the degree of fusion of iron ore in the high-temperature liquid slag along with time can not be accurately mastered, the production rhythm can not be reasonably and accurately arranged, and the adding time and the adding amount of raw materials such as iron ore, coal powder, flux and the like in the smelting process can not be reasonably matched and accurately controlled.
In the prior art, no specific calculation method for the solubility of the iron ore in the high-temperature liquid slag at different time is provided, and particularly only the high-temperature soft melting characteristic of the iron ore and the melting performance of the slag are focused.
For example: chinese patent CN102890098A discloses an analysis method for high-temperature soft melting characteristics of iron ore, which is based on TG-DSC (thermal-Differential Scanning calorimetry) thermal analysis technology, and has simple process and accurate detection result, and can effectively solve the problem of detection of high-temperature soft melting characteristics of iron ore, and provide necessary basic data for the blending and sintering processes of the subsequent iron-making process. The soft melting characteristic of the slag is not the change of the degree of dissolution of the iron ore in the high-temperature liquid slag with time, but the liquid phase quantity generated in the soft melting process of the iron ore in a crucible and SiO in the ore 2 The correlation relationship between the content and the eta value is studied.
Chinese patent CN102479290A discloses a method for calculating the meltability temperature of slag, which comprises: acquiring a plurality of groups of viscosity data and corresponding temperature data of the slag; according to the multiple groups of viscosities, the data of the viscosities corresponding to the multiple groups of viscosities and the functional relation of the viscosities changing along with the temperatures, a viscosity-temperature curve is fitted, and in a coordinate system where the viscosity-temperature curve is located, the unit of a vertical axis representing the viscosities is Pa.s, and the unit of a horizontal axis representing the temperatures is Pa.s; and taking the temperature corresponding to the tangent point of the viscosity-temperature curve and the straight line with the slope of-1/(50-70) as the melting temperature of the slag. The key point is that the calculated melting temperature can accurately express the characteristics of viscosity mutation and fluidity qualitative change, and the change of the melting degree of the iron ore in the high-temperature liquid slag along with time is not researched.
Disclosure of Invention
The invention aims to solve the technical problems that in the actual production process, the change of the solubility of iron ore in high-temperature liquid slag along with time cannot be accurately grasped, the calculation mode of the solubility of iron ore in high-temperature liquid slag is difficult to predict, the production rhythm cannot be reasonably and accurately arranged, and the adding time and the adding amount of raw materials such as iron ore, coal powder, flux and the like cannot be reasonably matched and accurately controlled in the smelting process.
In order to solve the technical problems, the invention provides the following technical scheme:
a method for calculating the degree of fusion of iron ore in high-temperature liquid slag at different times comprises the following steps:
s1, determining the initial diameter of the iron ored；
S2, determining the temperature of the high-temperature liquid slagT；
S3, substituting the parameters into
In the formula (1); wherein:
the degree of dissolution of iron ore in high-temperature liquid slag;
is the initial diameter of iron ore in mm;Tis the temperature of the high temperature liquid slag, in units of K;tthe time of iron ore melting in the high-temperature liquid slag is unit s; e is a natural constant with the value of 2.718,dimensionless;
s4, obtaining a calculation equation of the change of the iron ore dissolution degree along with time;
and S5, inputting the melting time, and obtaining the degree of dissolution of the iron ore in the high-temperature liquid slag corresponding to the melting time through calculation.
Preferably, the initial diameter of the iron ore in the step S1dThe maximum diameter, or average diameter, or screened particle size of the iron ore entering the high temperature liquid slag.
Preferably, the iron ore in the step S1 is characterized in that: minerals rich in iron oxide and capable of being economically utilized include, but are not limited to, sintered ore, pellet, lump ore, fine ore, etc. of different particle sizes.
Preferably, the initial diameter of the iron ore in the step S1dIs 1-30 mm.
Preferably, the temperature of the high temperature liquid slag in the step S2TAnd obtaining and determining the slag temperature detected in the furnace or detected outside the furnace when slag is discharged in the last furnace.
Preferably, the high temperature liquid slag in step S2 is characterized by: generated in pyrometallurgical process including but not limited to CaO, SiO 2 、FeO、MgO、Al 2 O 3 And high-temperature liquid melt with the oxide as the main component.
Preferably, the temperature of the high temperature liquid slag in the step S2T1673 and 1773K.
Preferably, the time for melting the iron ore in the high temperature liquid slag in the step S3tIs obtained by the difference between the time end point and the time zero point, wherein: the time when the iron ore enters the high-temperature liquid slag molten pool is taken as a time zero point, and any time in the iron ore melting process is taken as a time terminal.
Preferably, the time for melting the iron ore in the high temperature liquid slag in the step S3tIs 10-100 s.
Preferably, the degree of fusion in step S5αThe ratio of the mass of iron ore dissolved into the slag to the initial mass of the iron ore is more than or equal to 0αLess than or equal to 1. When iron ore is melted in high-temperature liquid slagTime of solutiontIncrease to a range in which the degree of melting is increasedαWhen the calculated value of (b) is greater than 1, the degree of melting at that time is meaningless.
Preferably, the degree of dissolution of the iron ore in the high temperature liquid slag in the step S5 is 0.284 to 0.910.
Compared with the prior art, the invention has the following beneficial effects:
in the scheme, the method can accurately and quickly calculate the corresponding fusion degrees of the iron ore in the high-temperature liquid slag at different times through the designed formula, so that the adding time and the adding amount of raw materials such as the iron ore, the coal powder and the flux required at different times are accurately adjusted, and the method is favorable for large-scale industrial popularization and use.
The method has the advantages of simple determination mode of the required process parameters, accurate calculation mode, timely and effective guidance of the adding flow and mutual proportion of the raw fuels such as iron ore, reducing agent, flux and the like in the smelting reduction process, and optimization of the production rhythm of the smelting reduction process.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for calculating the degree of fusion of iron ore in high-temperature liquid slag at different times, which is provided by the invention.
Detailed Description
The technical solutions and the technical problems to be solved in the embodiments of the present invention will be described below with reference to the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the patent of the invention, not all embodiments.
Example 1
A method for calculating the degree of fusion of iron ore in high-temperature liquid slag at different times, as shown in fig. 1, the method comprises the following steps:
s1, determining that the iron ore component is 92.93 percent Fe 2 O 3 -0.07%CaO-3.75%SiO 2 -0.07%MgO-2.06%Al 2 O 3 Initial diameter thereofdSelecting the maximum diameter of the iron ore entering the high-temperature liquid slag to be 1.0 mm;
s2, determining the components of the high-temperature liquid slag to be selected from 5.56 percent of FeO, 37.47 percent of CaO and 30.3 percent of SiO 2 -9.48%MgO-17.16%Al 2 O 3 Temperature thereofTObtaining 1673K of the slag temperature detected outside the furnace when slag is discharged in the last furnace;
s3, substituting the parameters into
In the formula (1); wherein:
the degree of dissolution of iron ore in high-temperature liquid slag;
is the initial diameter of iron ore in mm;Tis the temperature of the high temperature liquid slag, in units of K;tthe time of iron ore melting in the high-temperature liquid slag is unit s; e is a natural constant, the value is 2.718, and the dimension is not large;
s4, obtaining a calculation equation of the change of the iron ore dissolution degree along with time;
s5, inputting the time for melting the iron ore in the high-temperature liquid slagtThe melting degree of the iron ore in the high-temperature liquid slag corresponding to the melting time is calculated to be 0.284 after 10 s.
Example 2
A method for calculating the degree of fusion of iron ore in high-temperature liquid slag at different times, as shown in fig. 1, the method comprises the following steps:
s1, determining that the iron ore component is 92.93 percent Fe 2 O 3 -0.07%CaO-3.75%SiO 2 -0.07%MgO-2.06%Al 2 O 3 Initial diameter ofdAccording to the average diameter of iron ore entering the high-temperature liquid slagSelecting the thickness to be 5.0 mm;
s2, determining the components of the high-temperature liquid slag to be selected from 5.56 percent of FeO, 37.47 percent of CaO and 30.3 percent of SiO 2 -9.48%MgO-17.16%Al 2 O 3 Temperature thereofTPassing through the furnace and detecting as 1703K;
s3, substituting the parameters into
In the formula (1); wherein:
the degree of dissolution of iron ore in high-temperature liquid slag;
is the initial diameter of iron ore in mm;Tis the temperature of the high temperature liquid slag, in units of K;tthe time of iron ore melting in the high-temperature liquid slag is unit s; e is a natural constant, the value is 2.718, and the dimension is not large;
s4, obtaining a calculation equation of the change of the iron ore dissolution degree along with time;
s5, inputting the time for melting the iron ore in the high-temperature liquid slagtThe melting degree of the iron ore in the high-temperature liquid slag corresponding to the melting time is 0.385 through calculation at 30 s.
Example 3
A method for calculating the degree of fusion of iron ore in high-temperature liquid slag at different times, as shown in fig. 1, the method comprises the following steps:
s1, determining that the iron ore component is 92.93 percent Fe 2 O 3 -0.07%CaO-3.75%SiO 2 -0.07%MgO-2.06%Al 2 O 3 Initial diameter ofdSelecting the granularity of 10.0mm according to the screening grain size of the iron ore entering the high-temperature liquid slag;
s2, determining the components of the high-temperature liquid slag to be selected from 5.56 percent of FeO, 37.47 percent of CaO and 30.3 percent of SiO 2 -9.48%MgO-17.16%Al 2 O 3 Temperature thereofTThe temperature of the slag detected outside the furnace during the last slag discharge is 1723K;
s3, mixingIntroduction of the above parameters
In the formula (1); wherein:
the degree of dissolution of iron ore in high-temperature liquid slag;
is the initial diameter of iron ore in mm;Tis the temperature of the high temperature liquid slag, in units of K;tthe time of iron ore melting in the high-temperature liquid slag is unit s; e is a natural constant, the value is 2.718, and the dimension is not large;
s4, obtaining a calculation equation of the change of the iron ore dissolution degree along with time;
s5, inputting the time for melting the iron ore in the high-temperature liquid slagtThe time is 45s, and the degree of dissolution of the iron ore in the high-temperature liquid slag corresponding to the melting time is 0.480 through calculation.
Example 4
A method for calculating the degree of fusion of iron ore in high-temperature liquid slag at different times, as shown in fig. 1, the method comprises the following steps:
s1, determining that the iron ore component is 92.93 percent Fe 2 O 3 -0.07%CaO-3.75%SiO 2 -0.07%MgO-2.06%Al 2 O 3 Initial diameter ofdSelecting the average diameter of the iron ore entering the high-temperature liquid slag to be 20.0 mm;
s2, determining the components of the high-temperature liquid slag to be selected from 5.56 percent of FeO, 37.47 percent of CaO and 30.3 percent of SiO 2 -9.48%MgO-17.16%Al 2 O 3 Temperature thereofTPassage through the furnace was detected as 1743K;
s3, substituting the parameters into
In the formula (1); wherein:
the degree of dissolution of iron ore in high-temperature liquid slag;
is the initial diameter of iron ore in mm;Tis the temperature of the high temperature liquid slag, in units of K;tthe time of iron ore melting in the high-temperature liquid slag is unit s; e is a natural constant, the value is 2.718, and the dimension is not needed;
s4, obtaining a calculation equation of the change of the iron ore dissolution degree along with time;
s5, inputting the time for melting the iron ore in the high-temperature liquid slagtThe time is 60s, and the solubility of the iron ore in the high-temperature liquid slag corresponding to the melting time is 0.534 through calculation.
Example 5
A method for calculating the degree of fusion of iron ore in high-temperature liquid slag at different times, as shown in fig. 1, the method comprises the following steps:
s1, determining that the iron ore component is 92.93 percent Fe 2 O 3 -0.07%CaO-3.75%SiO 2 -0.07%MgO-2.06%Al 2 O 3 Initial diameter ofdSelecting the maximum diameter of the iron ore entering the high-temperature liquid slag to be 30.0 mm;
s2, determining the components of the high-temperature liquid slag to be selected from 5.56 percent of FeO, 37.47 percent of CaO and 30.3 percent of SiO 2 -9.48%MgO-17.16%Al 2 O 3 Temperature thereofTThe pass through the furnace was detected as 1773K;
s3, substituting the parameters into
In the formula (1); wherein:
the degree of dissolution of iron ore in high-temperature liquid slag;
is the initial diameter of iron ore in mm;Tis the temperature of the high temperature liquid slag, in units of K;tfor iron ore in high-temperature liquidTime in units of s for melting in the slag; e is a natural constant, the value is 2.718, and the dimension is not large;
s4, obtaining a calculation equation of the change of the iron ore dissolution degree along with time;
s5, inputting the time for melting the iron ore in the high-temperature liquid slagtThe melting degree of the iron ore in the high-temperature liquid slag corresponding to the melting time is calculated to be 0.910 after 100 s.
The change of the ore fusion degree judged according to experience along with time in production cannot establish a relation with parameters such as slag temperature, ore strength and the like, so that the error is large and the timeliness is low.
For example, in example 1, it was empirically determined that the degree of ore fusion was 0.228 in ten seconds, and the flow rate of pulverized coal was 22.37t/h and the flow rate of flux was 6.39t/h in accordance with the raw fuel ratio, and it was manually determined and adjusted. According to the method of the invention, the ore fusion degree is judged to be 0.284 at ten seconds, and the coal powder flow rate is 27.84t/h and the flux flow rate is 7.95t/h at the moment according to the raw fuel proportion. In the embodiment, the solubility judged by the method is higher than the solubility judged by experience, so that the flow of the pulverized coal and the flux is higher, the temperature of a molten pool is higher, and the smelting efficiency is higher. And the judgment process of the method can be carried out by using a computer and the flow of the raw fuel is correspondingly calculated, so that the errors and the hysteresis of manual operation are eliminated.
In the scheme, the designed formula can accurately and quickly calculate the corresponding solubility of the iron ore in the high-temperature liquid slag at different times, so that the adding time and the adding amount of raw materials such as the iron ore, the coal powder and the flux required at different times are accurately adjusted, and the method is favorable for industrial large-scale popularization and application.
The method has the advantages of simple determination mode of the required process parameters, accurate calculation mode, timely and effective guidance of the adding flow and mutual proportion of the raw fuels such as iron ore, reducing agent, flux and the like in the smelting reduction process, and optimization of the production rhythm of the smelting reduction process.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (9)
1. A method for calculating the degree of fusion of iron ore in high-temperature liquid slag at different times is characterized by comprising the following steps:
s1, determining the initial diameter of the iron ored；
S2, determining the temperature of the high-temperature liquid slagT；
S3, substituting the parameters into
In the formula (1); wherein:
the degree of dissolution of iron ore in the high-temperature liquid slag;dis the initial diameter of iron ore in mm;Tis the temperature of the high temperature liquid slag, in units of K;tthe time of iron ore melting in the high-temperature liquid slag is unit s; e is a natural constant, the value is 2.718, and the dimension is not large;
s4, obtaining a calculation equation of the change of the iron ore dissolution degree along with time;
and S5, inputting the melting time, and obtaining the degree of dissolution of the iron ore in the high-temperature liquid slag corresponding to the melting time through calculation.
2. The method for calculating the degree of dissolution of iron ore in high-temperature liquid slag at different times according to claim 1, wherein the initial diameter of iron ore in step S1dThe maximum diameter, or average diameter, or screened particle size of the iron ore entering the high temperature liquid slag.
3. The method for calculating the degree of dissolution of iron ore in high-temperature liquid slag at different times according to claim 2, wherein the initial diameter of the iron ore in the step S1dIs 1-30 mm.
4. The method for calculating the time-varying degree of dissolution of iron ore in high-temperature liquid slag according to claim 1, wherein the temperature of the high-temperature liquid slag in the step S2TAnd obtaining and determining the slag temperature detected in the furnace or detected outside the furnace when slag is discharged in the last furnace.
5. The method for calculating the time-varying degree of dissolution of iron ore in high-temperature liquid slag according to claim 4, wherein the temperature of the high-temperature liquid slag in the step S2T1673 and 1773K.
6. The method of claim 1, wherein the time for melting the iron ore in the high temperature liquid slag in step S3 is longer than the time for melting the iron ore in the high temperature liquid slag in the step S3tIs obtained by the difference between the time end point and the time zero point, wherein: the time when the iron ore enters the high-temperature liquid slag molten pool is taken as a time zero point, and any time in the iron ore melting process is taken as a time terminal.
7. The method of claim 6, wherein the time for melting the iron ore in the high temperature liquid slag in step S3 is longer than the time for melting the iron ore in the high temperature liquid slag in the step S3tIs 10-100 s.
8. The method for calculating the degree of dissolution of iron ore in high-temperature liquid slag at different times according to claim 1, wherein the degree of dissolution in step S5αIs the ratio of the mass of the iron ore dissolved into the slag to the initial mass of the iron ore,
。
9. the method of claim 1, wherein the degree of dissolution of the iron ore in the high temperature liquid slag at different times is 0.284 to 0.910 in the step S5.
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| CN103103341A (en) * | 2013-01-29 | 2013-05-15 | 东北大学 | Control method of iron particle granularity in deep reduction material |
| JP2014181369A (en) * | 2013-03-18 | 2014-09-29 | Kobe Steel Ltd | Method of producing reduced iron |
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| CN107557519A (en) * | 2017-10-23 | 2018-01-09 | 安徽工业大学 | A kind of method of reduction of iron ore rate in control converter |
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2022
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| CN103103341A (en) * | 2013-01-29 | 2013-05-15 | 东北大学 | Control method of iron particle granularity in deep reduction material |
| JP2014181369A (en) * | 2013-03-18 | 2014-09-29 | Kobe Steel Ltd | Method of producing reduced iron |
| CN106636669A (en) * | 2015-11-03 | 2017-05-10 | 哈尔滨市永恒鑫科技开发有限公司 | Optimization method for smelting ferronickel through lateritic ore |
| CN107557519A (en) * | 2017-10-23 | 2018-01-09 | 安徽工业大学 | A kind of method of reduction of iron ore rate in control converter |
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