CN110672458B - Method for rapidly evaluating vanadium-titanium magnetite concentrate agglomeration economy - Google Patents
Method for rapidly evaluating vanadium-titanium magnetite concentrate agglomeration economy Download PDFInfo
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Abstract
The invention relates to the technical field of ferrous metallurgy, and discloses a rapid evaluation method for vanadium-titanium magnetite concentrate agglomeration economy. The method comprises the following steps: s1, determining the components and the prices of the sintering raw material and the blast furnace raw material; s2, calculating the charging grade of the pellet according to the mixture ratio of the pellet and the bentonite; s3, calculating theoretical ore unit consumption and a blast furnace burden structure table according to the charging grade; s4, calculating the TFe content of the sinter and the unit consumption of the sinter according to the blast furnace burden structure table; s5, constructing a linear equation set according to the slag alkalinity, the TFe content of the sintering ore, the unit consumption of the sintering ore, the sintering fuel ratio and the flux ratio, and solving the unit consumption of the sintering raw materials; and S6, calculating the proportion and the components of the sintering raw materials and the cost of pig iron to obtain the rule of the influence of the change of the proportion of the pellets on the structure of the sintered ore blending. The method can quickly analyze the influence rule of the change of the pellet proportioning on the sintering proportioning structure when the set load of the blast furnace TiO2, the slag alkalinity and the furnace feeding grade are unchanged.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a rapid evaluation method for vanadium-titanium magnetite concentrate agglomeration economy.
Background
Due to TiO in vanadium-bearing titanium magnetite concentrate2Content and slag TiO2The influence of content control, when the different agglomeration modes of vanadium titanium magnetite concentrate are put into the furnace, the structure influence to the sintering material is big, but the essence is that the vanadium titanium magnetite concentrate in the sintering raw material shifts to the pellet ore, and this has great difference with ordinary ore smelting. In brief, after the vanadium-titanium magnetite concentrate is made into pellets and put into a furnace, along with the increase of the proportion of the pellets of the blast furnace, the proportion of the vanadium-titanium magnetite concentrate in sintering is reduced, and the proportion of other common powder ores and a flux and the components of the sinter are greatly changed. The method has important significance in analyzing the influence of the changes of the sintering material structure and the process parameters on the economic indexes of the sintering technology and the economic influence on the blast furnace burden along with the increase of the blast furnace vanadium-titanium pellet ore proportion.
The currently used evaluation method is to adopt a trial calculation method in a compiled Excel file, modify related data for many times, and check whether related results meet assumed requirements to obtain a corresponding scheme, which is time-consuming and labor-consuming.
The patent introduces a rapid evaluation method for vanadium-titanium magnetite concentrate agglomeration economy, which is based on the set TiO of a blast furnace2Under the condition of unchanged load, slag alkalinity and charging grade, the influence rule of blast furnace pellet ore proportioning increase on the sintering ore proportioning structure can be rapidly analyzed, and 9 groups of schemes and economic evaluation results can be obtained at one time.
Disclosure of Invention
The invention aims to solve the problems that the existing evaluation method in the prior art is time-consuming and labor-consuming, and provides a rapid evaluation method for the economical efficiency of vanadium-titanium magnetite concentrate agglomeration, which can rapidly analyze the influence rule of the increase of the blast furnace pellet ratio on the sintering ore proportioning structure.
In order to achieve the aim, the invention provides a method for quickly evaluating the agglomeration economy of vanadium-titanium magnetite concentrates, which comprises the following steps:
s1, determining the components and the price of the sintering raw material and the blast furnace raw material;
s2, calculating the charging grade of the pellet according to the mixture ratio of the pellet and the bentonite;
s3, calculating theoretical ore unit consumption and a blast furnace burden structure table according to the charging grade;
s4, calculating the TFe content of the sinter and the unit consumption of the sinter according to the blast furnace burden structure table;
s5, constructing a linear equation set according to the slag alkalinity, the TFe content of the sintering ore, the unit consumption of the sintering ore, the sintering fuel ratio and the flux ratio, and solving the unit consumption of the sintering raw materials;
and S6, calculating the proportion and the components of the sintering raw materials and the cost of pig iron to obtain the rule of the influence of the change of the proportion of the pellets on the structure of the sintered ore blending.
Preferably, in step S1, the sintering raw material contains vanadium-titanium magnetite concentrate, high-powder ore, medium-powder ore, quicklime, limestone and coke powder,
the vanadium-titanium magnetite concentrate contains 53-60 wt% of TFe and 2-4 wt% of SiO20.1-1 wt% CaO, 2-4 wt% MgO, 2-4 wt% Al2O3And 6-13% by weight of TiO2；
The high-powder ore contains 58-61 wt% of TFe and 5-9 wt% of SiO20.1-1 wt% CaO, 0.5-1.5 wt% MgO and 1-2 wt% Al2O3；
The middling ore contains 40-50 wt% of TFe and 15-25 wt% of SiO21-3 wt% CaO, 2-4 wt% MgO and 4-6 wt% Al2O3。
Preferably, in step S1, the blast furnace raw material contains sintered ore, pellet, bentonite, lump ore, coke and pulverized coal,
the pellet contains 52-60 wt% of TFe and 5-6 wt% of SiO20.1-1 wt% CaO, 2-4 wt% MgO, 3-4 wt% Al2O3And 5-10 wt% TiO2；
The lump ore contains 58-59 wt% of TFe and 8-9 wt% of SiO20.5-1.5 wt% CaO, 0.5-1.2 wt% MgO and 2-3 wt% Al2O3。
Preferably, in step S2, the charged grade of the pellets is calculated according to the following formula,
wherein M represents the charging grade of the pellet, N represents the TFe content of the vanadium-titanium magnetite concentrate, P represents the proportion of the vanadium-titanium magnetite concentrate, and Q represents the proportion of bentonite.
Preferably, in step S3, the ore in the theoretical ore unit consumption is pellet ore and lump ore; the calculation formula of the theoretical ore unit consumption is as follows,
R＝945/A
wherein R represents theoretical ore unit consumption, and A represents furnace charging grade.
Preferably, in step S4, the TFe content of the sintered ore is calculated by the following equilibrium equation:
A＝B1×C1+B2×C2+B3×C3
wherein A represents the charged grade, B represents the charged grade1Represents the proportion of the sintered ore, C1Denotes the TFe content of the sinter, B2Represents the proportion of pellets, C2Represents the TFe content of the pellets, B3Represents the proportion of lump ore, C3Represents the TFe content of the lump ore;
wherein, A, B1、B2、C2、B3、C3Are all known quantities.
Preferably, in step S4, the sintered ore unit consumption is calculated by the following equilibrium equation:
F＝(945/A)×B1
wherein F represents the unit consumption of the sinter, A and B1The meaning of (a) is the same as previously described.
Preferably, in step S5, the system of linear equations includes 5 equilibrium equations:
equation 1: sintering raw material firing residue value of sintering process is unit consumption of sintering ore
Wherein, X2The unit consumption, X, of the vanadium-titanium magnetite concentrate representing the sinter consumption3Denotes unit consumption, X, of high-fines ore4Denotes the unit consumption of middlings, X5Indicating unit consumption of quicklime, X6Denotes the unit consumption of limestone, X7The unit consumption of coke powder is shown, and Sum represents the yield of the sinter;
equation 2: the TFe content of the sintered ore calculated in the blast furnace burden structure table is equal to the TFe content of the corresponding sintered ore in the sintering raw material in the sintering step
Wherein, X2-X7And Sum have the same meaning as previously described;
equation 3: according to the smelting characteristics of the blast furnace process, the SiO of the molten iron is deducted from all the raw materials entering the furnace2Equation of equilibrium of alkalinity
Wherein, X1Vanadium-titanium magnetite concentrate unit consumption, X, representing pellet consumption2-X7Has the same meaning as described above, X8Denotes the unit consumption of bentonite, X9Denotes unit consumption, X, of lump ore10Denotes the unit consumption of coke, X11Representing the unit consumption of coal dust, R2Representing the binary basicity of the slag;
equation 4: the proportion of the quicklime in the sintering mixture is a fixed value D
Wherein, X2-X7The meaning of D is the same as that of the previous description, D represents the proportion of quicklime in the sinter mixture;
equation 5: the initial value of the carbon content in the sintering mixture is a fixed value E
Wherein, X1-X7The meaning of E is the same as that of the previous description, E represents the initial value of the carbon content in the sintering mixture, and 0.85 is the carbon content of the coke powder;
in the calculation process, X1、X2And X8-X11Is a known quantity, X3-X7For unknown quantity, the unique solution X satisfying the equation can be obtained according to 5 balance equations3-X7。
Preferably, in equation 3, R2Is a value actually set according to production.
Preferably, R2Was 1.05.
Preferably, in equation 4, D is a value set according to the basicity, and preferably, D is 0.08.
Preferably, in equation 5, E is a value set according to the sintering process requirements, and preferably, E is 0.035.
The method of the invention sets the TiO of the blast furnace2Under the condition of unchanged load, slag alkalinity and charging grade, the influence rule of the increase of the blast furnace pellet ore proportion on the sintering ore proportioning structure can be rapidly analyzed, and 9 groups of schemes and economic evaluation results can be obtained at one time.
Drawings
FIG. 1 is a graph showing the relationship between the pig iron cost and the pellet ratio in example 2;
FIG. 2 is a solver interface in example 2.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For numerical ranges, each range between its endpoints and individual point values, and each individual point value can be combined with each other to give one or more new numerical ranges, and such numerical ranges should be construed as specifically disclosed herein.
The invention provides a method for quickly evaluating the economy of vanadium-titanium magnetite concentrate agglomeration, which comprises the following steps:
s1, determining the components and the prices of the sintering raw material and the blast furnace raw material;
s2, calculating the charging grade of the pellet according to the mixture ratio of the pellet and the bentonite;
s3, calculating theoretical ore unit consumption and a blast furnace burden structure table according to the charging grade;
s4, calculating the TFe content of the sinter and the unit consumption of the sinter according to the blast furnace burden structure table;
s5, constructing a linear equation set according to the slag alkalinity, the TFe content of the sintering ore, the unit consumption of the sintering ore, the sintering fuel ratio and the flux ratio, and solving the unit consumption of the sintering raw materials;
and S6, calculating the proportion and the components of the sintering raw materials and the cost of pig iron to obtain the rule of the influence of the change of the proportion of the pellets on the structure of the sintered ore blending.
The method of the invention sets the TiO of the blast furnace2Under the condition of unchanged load, slag alkalinity and charging grade, the influence rule of the increase of the blast furnace pellet ore proportion on the sintering ore proportioning structure can be rapidly analyzed, and 9 groups of schemes and economic evaluation results can be obtained at one time. In the present invention, unless otherwise specified, TFe means total iron.
In the method of the present invention, in step S1, the sintering raw material contains vanadium-titanium magnetite concentrate, high-fine ore, medium-fine ore, quicklime, limestone, and coke powder. The mixture of the quicklime and the limestone is a solvent, and the coke powder is sintering fuel.
The vanadium-titanium magnetite concentrate contains 53-60 wt% of TFe and 2-4 wt% of SiO20.1-1 wt% CaO, 2-4 wt% MgO, 2-4 wt% Al2O3And 6-13% by weight of TiO2. The vanadium-titanium magnetite concentrate also contains S and V which influence the desulfurization cost2O5And the like.
The high-powder ore contains TFe 58-61 wt% and SiO 5-9 wt%20.1-1 wt% CaO, 0.5-1.5 wt% MgO and 1-2 wt% Al2O3. The high-fine ore also contains other components such as S, P and the like.
The middling ore contains 40-50 wt% of TFe and 15-25 wt% of SiO21-3 wt% CaO, 2-4 wt% MgO and 4-6 wt% Al2O3. The middlings can also contain other components such as S and P.
In a preferred embodiment, the vanadium-titanium magnetite concentrate contains 54 wt.% of TFe, 3.8 wt.% of SiO20.5 wt% CaO, 2.8 wt% MgO, 3.5 wt% Al2O3And 12.2% by weight of TiO2(ii) a The high-fines ore contained 60 wt.% TFe, 6 wt.% SiO20.5% by weight of CaO, 1.5% by weight of MgO and 2% by weight of Al2O3(ii) a The middlings contained 42.5 wt.% of TFe and 17.5 wt.% of SiO 22% by weight of CaO, 3% by weight of MgO and 5% by weight of Al2O3。
In the method of the present invention, in step S1, the blast furnace raw material contains sintered ore, pellet, bentonite, lump ore, coke, and pulverized coal.
The pellet contains 52-60 wt% of TFe and 5-6 wt% of SiO20.1-1 wt% CaO, 2-4 wt% MgO, 3-4 wt% Al2O3And 5-10 wt% TiO2. The pellet also contains V2O5And the like.
The lump ore contains 58-59 wt% of TFe and 8-9 wt% of SiO20.5-1.5 wt% CaO, 0.5-1.2 wt% MgO and 2-3 wt% Al2O3. The lump ore also contains other components such as C and the like.
In the method of the present invention, in step S2, the charged grade of the pellets is calculated according to the following formula,
wherein M represents the charging grade of the pellet, N represents the TFe content of the vanadium-titanium magnetite concentrate, P represents the proportion of the vanadium-titanium magnetite concentrate, and Q represents the proportion of bentonite.
In step S2, the purpose of calculating the charging grade of the pellet is to calculate the TFe grade of the sintered ore under the condition that the charging grade of the blast furnace ore is specified.
In the method of the invention, in step S3, the ore in the theoretical ore unit consumption is pellet ore and lump ore; the calculation formula of the theoretical ore unit consumption is as follows,
R＝945/A
wherein R represents theoretical ore unit consumption, and A represents furnace charging grade.
In the method of the present invention, in step S4, the TFe content of the sintered ore is calculated by the following equilibrium equation:
A＝B1×C1+B2×C2+B3×C3
wherein A represents a charged ore grade, B represents a charged ore grade1Represents the proportion of the sintered ore, C1Denotes the TFe content of the sinter, B2Represents the proportion of pellets, C2Represents the TFe content of the pellets, B3Represents the proportion of lump ore, C3Represents the TFe content of the lump ore;
wherein, in the equilibrium equation, A, B1、B2、C2、B3、C3Are known amounts.
In the calculation of burningAt TFe content of the agglomerates, B140-75%, B220-60%, B 32 to 5 percent; specifically, B1Can be 65%, 55%, 45%, 75%, B2May be 20%, 22%, 24%, 26%, 28% or 55%, B3May be 2%, 3%, 4% or 5%; preferably, B170% of B 225% of B3The content was found to be 3%.
In the method of the present invention, in step S4, the sintered ore specific consumption is calculated by the following equilibrium equation:
F＝(945/A)×B1
wherein F represents the unit consumption of the sinter, A and B1The meaning of (a) is the same as previously described.
In the method of the present invention, in step S5, the system of linear equations includes 5 equilibrium equations:
equation 1: sintering raw material firing residue value of sintering process is unit consumption of sintering ore
Wherein, X2The unit consumption, X, of the vanadium-titanium magnetite concentrate representing the sinter consumption3Denotes unit consumption, X, of high-fines ore4Denotes the unit consumption of middlings, X5Indicating unit consumption of quicklime, X6Denotes the unit consumption of limestone, X7Indicating the unit consumption of coke powder and Sum indicating the production of sinter.
Equation 2: TFe content of sintered ore calculated in blast furnace burden structure table (TFe content of sintered ore corresponding to sintering raw material in sintering process)
Wherein, X2-X7And Sum have the same meaning as previously described.
Equation 3: according to the smelting characteristics of the blast furnace process, the SiO of the molten iron is deducted from all the raw materials entering the furnace2After alkaliEquation of degree balance
Wherein, X1Vanadium-titanium magnetite concentrate unit consumption, X, representing pellet consumption2-X7Has the same meaning as described above, X8Denotes the unit consumption of bentonite, X9Denotes unit consumption, X, of lump ore10Denotes the unit consumption of coke, X11Representing the unit consumption of coal dust, R2Representing the binary basicity of the slag.
Equation 4: the proportion of the quicklime in the sintering mixture is a fixed value D
Wherein, X2-X7The meaning of D is the same as that described above, and D represents the proportion of quicklime in the sinter mix.
Equation 5: the initial value of the carbon content in the sintering mixture is a fixed value E
Wherein, X1-X7The meaning of E is the same as that described above, E represents the initial value of the carbon content in the sinter mix, and 0.85 represents the carbon content of the coke powder.
In the calculation process, X1、X2And X8-X11Is a known quantity, X3-X7For unknown quantity, the unique solution X satisfying the equation can be obtained according to 5 balance equations3-X7。
In the method of the present invention, in equation 3, R2Is a value set according to production practice, preferably R2Was 1.05.
In the method of the present invention, in equation 4, D is a value set according to the basicity, and preferably, D is 0.08.
In the method of the present invention, in equation 5, E is a value set according to the sintering process requirement, and preferably, E is 0.035.
The present invention will be described in detail below by way of examples, but the scope of the present invention is not limited thereto.
Example 1
S1, selecting components and prices of a vanadium-titanium magnetite concentrate and corresponding sintering raw materials and blast furnace raw materials, wherein the components of the vanadium-titanium magnetite concentrate and corresponding sintering raw materials and blast furnace raw materials are shown in Table 1;
TABLE 1
Cf in Table 1 represents fixed carbon, and Ig is a burnout value, i.e., a weight change width after baking at 1000 ℃ X1-X11Same as described above;
s2, calculating the charging grade of the pellet according to the mixture ratio of the pellet and the bentonite;
s3, specifying the furnace charging grade to be 50.5 percent and furnace charging TiO2When the load is 130kg/t, calculating the theoretical ore unit consumption and a blast furnace burden structure table;
s4, calculating the TFe content of the sinter and the unit consumption of the sinter according to the blast furnace burden structure table;
s5, constructing a linear equation set comprising 5 balance equations, solving the unit consumption of the sintering raw materials,
equation 1: sintering raw material firing residue value of sintering process is unit consumption of sintering ore
Wherein, X2The unit consumption, X, of the vanadium-titanium magnetite concentrate representing the sinter consumption3Denotes unit consumption, X, of high-fines ore4Denotes the unit consumption of middlings, X5Indicating unit consumption of quicklime, X6Denotes the unit consumption of limestone, X7The unit consumption of coke powder is shown, and Sum represents the yield of sinter;
equation 2: the TFe content of the sintered ore calculated in the blast furnace burden structure table is equal to the TFe content of the corresponding sintered ore in the sintering raw material in the sintering step
Wherein, X2-X7And Sum have the same meaning as previously described;
equation 3: according to the smelting characteristics of the blast furnace process, the SiO of the molten iron is deducted from all the raw materials entering the furnace2Equation of equilibrium of alkalinity
Wherein, X1Vanadium-titanium magnetite concentrate unit consumption, X, representing pellet consumption2-X7Has the same meaning as described above, X8Denotes the unit consumption of bentonite, X9Denotes unit consumption, X, of lump ore10Denotes the unit consumption of coke, X11Representing the unit consumption of coal dust, R2Denotes the binary basicity of the slag, R2Is 1.1;
equation 4: the proportion of the quicklime in the sintering mixture is a fixed value of 0.08
Wherein, X2-X7The meaning of (a) is the same as previously described;
equation 5: the initial value of the carbon content in the sintering mixture is a fixed value of 0.035
Wherein, X1-X7Has the same meaning as described above, 0.85 being coke powderThe carbon content;
in the calculation process, X1、X2And X8-X11Is a known quantity, X3-X7For unknown quantity, the unique solution X satisfying the equation can be obtained according to 5 balance equations3-X7；
S6, calculating the proportion and the components of the sintering raw materials and the cost of pig iron, and the rule of the influence of the change of the proportion of the obtained pellet on the structure of the sintered ore blending is shown in Table 2.
TABLE 2
As can be seen from table 2, as the pellet ratio is increased from 20% to 50%, when the vanadium-titanium magnetite concentrate is made of Panzhihua vanadium-titanium magnetite concentrate with 54% of TFe content, the pig iron ore blending cost is in a downward trend; the ratio of vanadium-titanium magnetite concentrate in sintering is reduced from 47.13% to 17.72%, the ratio of high-powder ore is increased from 33.82% to 56.07%, the sintering alkalinity is increased from 1.77 to 2.69, and CaO and SiO in sintered ore2The sum of the contents of (A) is increased from 14.5% to 20.7%. From the experience of sintering practice, the proportion of vanadium-titanium magnetite concentrate is reduced, the proportion of common ore is increased, and the improvement of sintering alkalinity and silicon-calcium level are both beneficial to the improvement of the quality of sintered products.
Example 2
Analyzing the influence rule of the change of the pellet mixture ratio on the sintered ore proportioning structure according to the method described in example 1, except that in step S1, the vanadium-titanium magnetite concentrate is a white martensite-titanium magnetite concentrate with a TFe content of 56%, and the composition thereof is shown in table 3; in step S3, the charged ore grade was 51.5%, and charged TiO was designated2The load is 125 kg/t; in step S5, the slag binary basicity R21.05, the obtained relationship diagram of the pig iron cost and the pellet ratio is shown in fig. 1, the influence rule of the change of the obtained pellet ratio on the sintering ore blending structure is shown in table 4, and the solver interface is shown in fig. 2.
TABLE 3
| Name of article | Tfe/％ | SiO2/％ | CaO/％ | MgO/％ | Al2O3/％ | TiO2/％ | Ig/％ |
| White-horse vanadium-titanium magnetite concentrate | 56.50 | 3.60 | 0.50 | 3.20 | 3.50 | 10.20 | -1.50 |
TABLE 4
As can be seen from Table 4, as the pellet mix ratio is increased from 20% to 60%, the vanadium-titanium magnetite concentrate is completely processed by the martensite with TFe content of 56%When the ilmenite concentrate is produced, the pig iron ore blending cost is in a descending trend; the ratio of vanadium-titanium-iron concentrate in sintering is reduced from 59% to 19.9%, the ratio of high-powder ore is increased from 18.4% to 39.5%, the sintering alkalinity is increased from 1.73 to 2.95, and CaO and SiO in sintered ore2The sum of the contents of (A) is increased from 14.7% to 24.6%. From the experience of sintering practice, the proportion of the vanadium-titanium magnetite concentrate is reduced, the proportion of common ore is increased, and the improvement of the sintering alkalinity and the silicon-calcium level are beneficial to the improvement of the quality of a sintered product. As can be seen from Table 4, when the pellet ratio is 50%, the pig iron ore blending cost is reduced by about 27.6 yuan/ton iron as compared with that when the pellet ratio is 20%.
Example 3
The method of example 1 was used to analyze the influence of the change of the pellet mix ratio on the sintered mix structure, except that in step S1, the vanadium-titanium magnetite concentrate was a white martensite-titanium magnetite concentrate having a TFe content of 59%, and the composition thereof is shown in table 5; in step S3, the charged grade is designated as 53%, and charged TiO is designated2The load was 125 kg/t; in step S5, the slag binary basicity R2The ratio was 1.05, and the rule of the influence of the change in the ratio of the obtained pellets on the structure of the sintered ore blend is shown in Table 6.
TABLE 5
| Name of article | Tfe/％ | SiO2/％ | CaO/％ | MgO/％ | Al2O3/％ | TiO2/％ | Ig/％ |
| White horse vanadium titanium magnetite concentrate | 59.00 | 2.00 | 0.40 | 2.50 | 3.00 | 10.40 | -1.50 |
TABLE 6
As can be seen from table 6, when the feed grade is 53%, the pig iron ore blending cost is in a downward trend when the vanadium-titanium magnetite concentrate is completely used as the amantadine vanadium-titanium magnetite concentrate with the TFe content of 59% as the pellet ratio is increased from 20% to 60%; the ratio of vanadium-titanium magnetite concentrate in sintering is reduced from 63.6% to 28.1%, the ratio of high-powder ore is increased from 10.8% to 25.5%, the sintering alkalinity is increased from 1.75 to 2.47, and CaO and SiO in sintered ore2The sum of the contents of (A) increases from 13.0% to 24.1%. From the experience of sintering practice, the proportion of the vanadium-titanium magnetite concentrate is reduced, the proportion of common ore is increased, and the improvement of the sintering alkalinity and the silicon-calcium level are beneficial to the improvement of the quality of a sintered product. As can be seen from Table 6, when the pellet ratio is 50%, the pig iron ore blending cost is reduced by about 23 yuan/t iron compared with that when the pellet ratio is 20%. Compared with the example 2, the proportion of the middlings is greatly increased, and the middlings are mainly influenced by the low silicon content of the white-mare vanadium-titanium magnetite concentrate with the TFe content of 59%.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (12)
1. A method for rapidly evaluating the agglomeration economy of vanadium-titanium magnetite concentrates is characterized by comprising the following steps:
s1, determining the components and the prices of the sintering raw material and the blast furnace raw material;
s2, calculating the charging grade of the pellet according to the mixture ratio of the pellet and the bentonite;
s3, calculating theoretical ore unit consumption and a blast furnace burden structure table according to the charging grade;
s4, calculating the TFe content of the sinter and the unit consumption of the sinter according to the blast furnace burden structure table;
s5, constructing a linear equation set according to the slag alkalinity, the TFe content of the sintering ore, the unit consumption of the sintering ore, the sintering fuel ratio and the flux ratio, and solving the unit consumption of the sintering raw materials;
s6, calculating the proportion and the components of the sintering raw materials and the pig iron cost to obtain the influence rule of the change of the proportion of the pellet ore on the sintering ore blending structure;
in step S5, the system of linear equations includes 5 equilibrium equations:
equation 1: sintering raw material firing residue value of sintering process is unit consumption of sintering ore
Wherein, X2The unit consumption, X, of the vanadium-titanium magnetite concentrate representing the sinter consumption3Denotes unit consumption, X, of high-fines ore4Denotes the unit consumption of middlings, X5Indicating unit consumption of quicklime, X6Denotes the unit consumption of limestone, X7The unit consumption of coke powder is shown, and SinSum represents the yield of sinter;
equation 2: the TFe content of the sintered ore calculated in the blast furnace burden structure table is equal to the TFe content of the corresponding sintered ore in the sintering raw material in the sintering step
Equation 3: according to the smelting characteristics of the blast furnace process, the SiO of the molten iron is deducted from all the raw materials entering the furnace2Equation of equilibrium of alkalinity
Wherein, X1Vanadium-titanium magnetite concentrate unit consumption, X, representing pellet ore consumption8Denotes the unit consumption of bentonite, X9Denotes unit consumption, X, of lump ore10Denotes the unit consumption of coke, X11Representing the unit consumption of coal dust, R2Representing the binary basicity of the slag;
equation 4: the proportion of the quicklime in the sintering mixture is a fixed value D
Wherein D represents the proportion of quicklime in the sintering mixture;
equation 5: the initial value of the carbon content in the sintering mixture is a fixed value E
Wherein E represents the initial value of the carbon content in the sintering mixture, and 0.85 is the carbon content of the coke powder;
in the calculation process, X1、X2And X8-X11Is a known quantity, X3-X7For unknown quantity, the unique solution X satisfying the equation can be obtained according to 5 balance equations3-X7。
2. The method of claim 1, wherein the sintering raw material contains vanadium-titanium magnetite concentrate, high-fine ore, medium-fine ore, quicklime, limestone and coke powder in step S1,
the vanadium-titanium magnetite concentrate contains 53-60 wt% of TFe and 2-4 wt% of SiO20.1-1 wt% CaO, 2-4 wt% MgO, 2-4 wt% Al2O3And 6-13% by weight of TiO2；
The high-powder ore contains TFe 58-61 wt% and SiO 5-9 wt%20.1-1 wt% CaO, 0.5-1.5 wt% MgO and 1-2 wt% Al2O3；
The middling ore contains 40-50 wt% of TFe and 15-25 wt% of SiO21-3 wt% CaO, 2-4 wt% MgO and 4-6 wt% Al2O3。
3. The method of claim 1, wherein the blast furnace raw material comprises sintered ore, pellet ore, bentonite, lump ore, coke, and fine coal at step S1,
the pellet contains 52-60 wt% of TFe and 5-6 wt% of SiO20.1-1 wt% CaO, 2-4 wt% MgO, 3-4 wt% Al2O3And 5-10 wt% TiO2；
The lump ore contains 58-59 wt% of TFe and 8-9 wt% of SiO20.5-1.5 wt% CaO, 0.5-1.2 wt% MgO and 2-3 wt% Al2O3。
4. The method as claimed in claim 1, wherein, in step S2, the charged grade of the pellets is calculated according to the following formula,
wherein M represents the charging grade of the pellet, N represents the TFe content of the vanadium-titanium magnetite concentrate, P represents the proportion of the vanadium-titanium magnetite concentrate, and Q represents the proportion of bentonite.
5. The method as claimed in claim 1, wherein in step S3, the ore in theoretical ore unit consumption is pellet ore, sinter ore and lump ore; the theoretical ore unit consumption is calculated as follows, R is 945/A
Wherein R represents theoretical ore unit consumption, and A represents furnace charging grade.
6. The method according to claim 1, wherein in step S4, the TFe content of the sinter is calculated by the following equilibrium equation:
A＝B1×C1+B2×C2+B3×C3
wherein A represents the charged grade, B represents the charged grade1Represents the proportion of the sintered ore, C1Denotes the TFe content of the sinter, B2Represents the proportion of pellets, C2Represents the TFe content of the pellets, B3Represents the proportion of lump ore, C3Represents the TFe content of the lump ore;
wherein, A, B1、B2、C2、B3、C3Are all known quantities.
7. The method according to claim 6, wherein in step S4, the sintered ore specific consumption is calculated by the following equilibrium equation:
F＝(945/A)×B1
wherein F represents the unit consumption of the sinter, A and B1The meaning of (a) is the same as previously described.
8. The method of claim 1, wherein in equation 3, R2Is a value actually set according to production.
9. The method of claim 8, wherein the step of removing the metal oxide layer comprises removing the metal oxide layer from the metal oxide layerIn equation 3, R2Was 1.05.
10. The method according to claim 8, wherein in equation 4, D is a value set according to basicity; in equation 5, E is a value set according to the sintering process requirements.
11. The method of claim 10, wherein D is 0.08 in equation 4.
12. The method of claim 10, wherein in equation 5, E is 0.035.
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