CN114864010A - Multifunctional ore blending model building method for pellet ore - Google Patents

Multifunctional ore blending model building method for pellet ore Download PDF

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CN114864010A
CN114864010A CN202210215465.3A CN202210215465A CN114864010A CN 114864010 A CN114864010 A CN 114864010A CN 202210215465 A CN202210215465 A CN 202210215465A CN 114864010 A CN114864010 A CN 114864010A
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ore
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段再基
宋云锋
李丙午
金龙忠
端飞
陈连发
黄菲
陈�峰
林高鹏
樊晶莹
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Maanshan Iron and Steel Co Ltd
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Abstract

The invention discloses a method for building a multifunctional ore blending model of pellet ore, and relates to the technical field of sintering pellets. The multifunctional pellet ore blending model building method is characterized by comprising the following steps: the specific operation is as follows: and S1, calculating the weight gain rate of the oxidation reaction of the FeO content in the magnetite concentrate. The multifunctional pellet ore blending model building method is based on the oxidizing roasting theory of magnetite ore concentrate pellets, and is characterized in that the multifunctional pellet ore blending model is designed, the adaptability of the pellet ore blending model to magnetite ore concentrates with different FeO contents, different raw material-200-mesh proportions, different raw material S contents and different alkali metal contents is improved besides the calculation of a plurality of main components and raw material consumption cost of the pellets, the comprehensiveness and the accuracy of the pellet ore blending model on pellet ore quality prediction are improved, and the pellet ore blending structure is subjected to multi-angle multifunctional evaluation according to pellet ore quality, bentonite unit consumption, process energy consumption, environmental protection, cost and the like.

Description

Multifunctional ore blending model building method for pellet ore
Technical Field
The invention relates to the technical field of sintered pellets, in particular to a method for building a multifunctional ore blending model of pellet ore.
Background
Compared with the sintering process, the pelletizing process has obvious advantages in the aspects of energy conservation, low carbon and waste gas emission. 1. The energy consumption of the pelletizing process is reduced by more than 40 percent compared with that of the sintering process; 2. the emission of flue gas is only about 75 percent of the emission of the sintered SO in each ton of pellet 2 And NO x The discharge amount is only 1/2 and 1/3 respectively, so the environmental protection investment and the operation cost of the pellet production are low relative to the sintering; 3. the sintering ore is bonded by liquid phase, the ideal material layer permeability is the key for smoothly performing the sintering process, and internal carbon preparation with proper proportion is indispensable; the pellets are solidified by solid-phase roasting, coke or coal can be completely omitted in the process, and the selection of clean fuel types meeting the emission reduction control requirements is higher; 4. compared with sintered ore, the pellet ore has the characteristics of high grade, uniform granularity and the like, and easily meets the requirement of blast furnace production on low-carbon emission. Because the grade of the pellet ore is generally higher than that of the sinter ore and the high-proportion pellets are used, the ore level entering the furnace is improved, the slag ratio is reduced, the erosion of the slag on the blast furnace lining, the erosion of the slag flow passing through the coke layer, the influence on soft-melt dripping, air permeability and the like are reduced, and the blast furnace is favorable for strengthening the blast furnace and optimizing the technical and economic indexes of the blast furnace. The preparation of high-quality metallurgical pellets and the smelting of high-proportion pellets in a blast furnace are to be brokenThe method solves the problem of reducing pollutant emission in the long process of Chinese steel and realizes the best measure of low-carbon smelting and sustainable development.
The ore blending models related to sintering are many, but the ore blending models related to pellets are few, the ore blending models of pellets are mostly obtained by reversely deducing raw materials and pellet components, the calculation is not strict according to the pellet theory, and the theoretical component value and the actual value of the pellets often have larger errors, so that the adaptability of the ore blending models of pellets is poor. Because most of the raw materials of the pellet are magnetite concentrate, the magnetite concentrate is increased in weight due to the oxidation of FeO during roasting, the weight of the dry-basis pellet after being sintered is preliminarily calculated to be about 2 percent, and the weight increase has great influence on the theoretical component calculation of the pellet. In addition, the prior ore preparation has a single target, and generally comprises the components of TFe and SiO of pellets 2 、Al 2 O 3 Mainly, in order to increase the adaptability of the ore blending model, the ore blending model is strictly established according to the pellet roasting theory, and harmful elements are added into the ore blending target for calculation (S, P, Zn, alkali metal and TiO) 2 ) And the FeO content (exothermic heat of oxidation during firing) in the mixture.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a multifunctional ore blending model building method for pellets, which solves the problems that in the prior art, most ore blending models for pellets are obtained according to reverse extrapolation of raw materials and pellet components, the theoretical component values and the actual values of the pellets are not strictly calculated according to pellet theories, large errors often occur between the theoretical component values and the actual values of the pellets, the adaptability of the ore blending models for the pellets is poor, most raw materials of the pellets are magnetite concentrates, the weight of the magnetite concentrates is increased due to oxidation of FeO during roasting, the weight increase is roughly calculated to be about 2 percent after the pellets are sintered on a dry basis, and the weight increase has great influence on the theoretical component calculation of the pellets. In addition, the prior ore preparation has a single target, and generally comprises the components of TFe and SiO of pellets 2 、Al 2 O 3 Mainly, the adaptability is not strong.
(II) technical scheme
In order to achieve the purpose, the invention is realized by the following technical scheme: a multifunctional ore blending model building method for pellet ore specifically comprises the following operations:
and S1, calculating the weight gain rate of the oxidation reaction of the FeO content of the magnetite concentrate. FeO oxidation reaction formula:
Figure BDA0003534319110000021
144 16 160；
wherein the oxidation of the FeO content of the magnetite is the weight increasing process, and the weight increasing rate B of the FeO is 16/144 multiplied by 100 percent to 11.1 percent; and S2, calculating the desulfurization efficiency of the magnetite concentrate. Oxidation reaction of S in iron ore concentrate:
4FeS 2 +11O 2 ↑＝2Fe 2 O 3 +8SO 2 ↑
4FeS+7O 2 ↑＝2Fe 2 O 3 +4SO 2 ↑
it can be seen that the oxidation of magnetite concentrate sulfur is a weight loss process, the above reaction requires-600 ℃, and pellets are produced
The roasting temperature is 1250 ℃, so that only a small part of the pellets are remained, the pellets usually contain about 0.005 percent of S, and the desulfurization efficiency of the pellets is (0.080-0.005) ÷ 0.080 × 100% — 93.74% when the concentrate powder contains 0.080 percent of sulfur;
and S3, determining the burning loss value of the bentonite.
Experiments and data examination show that the burning loss rate of the bentonite is 16 percent;
s4, calculating the dry ratio of the raw materials.
The proportion of each raw material of the on-site production line is generally wet-based proportion, and the proportion needs to be converted into dry-based proportion during calculation:
Figure BDA0003534319110000031
in the formula P i Is the dry basis proportion of the ith raw material, J i Is the wet basis proportion of the ith raw material, S i Is the moisture content of the i-th raw material,
Figure BDA0003534319110000032
for each originalMultiplying the wet basis ratio by the sum of (1-water content);
and S5, calculating the sintering amount of the pellet.
Weight gain coefficient Z of each concentrate powder Concentrate ore ＝[P i FeO content in x B x refined powder]- [ concentrate S content X pellet desulfurization efficiency]
Pellet weight gain coefficient Z Pellet of pellet ＝(∑Z Refined flour ) - (dry basis ratio of bentonite x burnout rate)
In the formula P i In terms of the dry basis proportion of the ith raw material, B represents the weight gain rate (11.1%) of FeO, the pellet desulfurization efficiency is 93.74% calculated in the step S2, and the burn-out rate of bentonite is 16% set in the step S3;
pellet firing amount Q ═ 1+ Z Pellet of pellet ；
And S6, calculating the theoretical components of the pellets.
Amount of TFe of pellet brought into each raw material ∑ TFe/amount of fired pellet Q
The rest (SiO) 2 、Al 2 O 3 、Zn、TiO 2 Alkali metals, etc.) and so on;
s7, calculating the proportion of the pelletizing mixture to 200 meshes
L i ＝P i ×A i
Pelletizing mixture in 200 mesh proportion
Figure BDA0003534319110000033
In the formula P i Is the dry basis proportion of the ith raw material, A i Is the proportion of the ith raw material to 200 meshes, and L is the proportion of the pelletizing mixture to 200 meshes, namely L is the sum of all the dry basis proportions of the materials multiplied by the proportion to 200 meshes. Similarly, the FeO content of the pelletizing mixture can be obtained;
s8, pelletizing mixture dry basis sulfur content and flue gas SO 2 Concentration prediction calculation
Third, calculating sulfur content of pelletizing mixture in dry basis
S i ＝P i ×s i
Dry basis S content of pelletizing mixture
Figure BDA0003534319110000041
In the formula P i Is the dry basis proportion of the ith raw material, s i The sulfur content is the i-th sulfur content, and S is the dry-basis sulfur content of the pelletizing mixture, namely S is the sum of all dry-basis mixture ratios of all materials multiplied by the sulfur content of the materials.
Smoke SO 2 Concentration prediction calculation
SO in pellet flue gas 2 Mainly from concentrate powder, and a small part of flue gas SO from the pelletizing process of solid fuel-coal, and calculating total gas 2 Concentration, SO in exhausted flue gas 2 Almost 100% results from the oxidation of the concentrate powder S.
Amount of sulfur oxidation W per hour S Dry basis sulphur content of dry basis pellet amount (t/h) x pelletizing mixture (W x S) according to S and SO 2 Molecular weight relationship, S relative molecular weight 32, SO 2 The relative molecular weight is 64, calculated per
Hourly flue gas SO 2 Measurement of
Figure BDA0003534319110000042
In the formula M so2 Is SO 2 Relative molecular weight, M s Is the relative molecular weight of S, W S Is the amount of sulfur oxidation W per hour S Pellet gas SO 2 Concentration of
Figure BDA0003534319110000043
Wherein the smoke quantity of Q is the total smoke quantity of pellet per hour, N so2 For predicted pellet flue gas SO 2 Concentration in mg/m 3 ；
And S9, calculating the unit consumption of each raw material.
Figure BDA0003534319110000044
In the formula D i Is the unit consumption of the ith raw material, P i The dry basis proportion of the ith raw material is adopted;
and S10, calculating the cost of the raw materials.
C i Unit consumption of a certain raw material x unit price of the raw material D i ×X i
Figure BDA0003534319110000051
(III) advantageous effects
The invention provides a method for building a multifunctional ore blending model of pellet ore. The method has the following beneficial effects:
(1) the multifunctional pellet blending model building method is based on the oxidizing roasting theory of magnetite concentrate pellets, the multifunctional pellet blending model is designed, besides the calculation of a plurality of main components and raw material consumption cost of the pellets, the adaptability of the pellet blending model to magnetite concentrates with different FeO contents, different raw material-200 mesh proportions, different raw material S contents and different alkali metal contents is improved, the comprehensiveness and accuracy of the pellet blending model in pellet quality prediction are improved, and the pellet blending structure is subjected to multi-angle multifunctional evaluation from pellet quality, bentonite unit consumption, process energy consumption, environmental protection, cost and the like.
(2) The method for building the multifunctional pellet blending model calculates the oxidation reaction heat release corresponding to the magnetite concentrates with different FeO contents and the weight gain rate of finished pellets on the basis of the oxidation chemical reaction of the magnetite concentrate pellets, determines the influence of the FeO content of the magnetite concentrate pellets on the pellet components and the process energy consumption, and improves the adaptability of the pellet blending model to the magnetite concentrates with different FeO contents and the accuracy of cost prediction.
(3) The multifunctional ore blending model building method for the pellet ore reads the proportion of each raw material of the pellet ore to 200 meshes, calculates the proportion of the pelletizing mixture to 200 meshes, increases the analysis function of the pellet batching model on the consumption of bentonite, and improves the adaptability of the pellet batching model to different raw material to 200 meshes and the accuracy of cost prediction.
(4) The pellet multifunctional ore blending model building method comprises the steps of reading the S content of each raw material of pellets, calculating the S content of pelletizing mixture, and calculating the S content according to the smoke gas amount in the pellet roasting processOxidation reaction with sulfide to predict pellet flue gas SO 2 The concentration provides basis for ultralow emission of flue gas generated in pellet production, environmental protection accidents are avoided, the adaptability of the pellet batching model to the contents of S in different raw materials is improved, the alkali metal content of the pellets is calculated by reading the alkali metal content of each raw material of the pellets, the change condition of the reduction expansion rate of the pellets is predicted, and the comprehensiveness and the accuracy of the pellet batching model to pellet quality prediction are improved.
Drawings
FIG. 1 is a schematic diagram of EXCEL form entry settings for a compounding model according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating the EXCEL form output setting of the dosing model according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, the present invention provides a technical solution: a multifunctional ore blending model building method for pellet ore specifically comprises the following operations:
and S1, calculating the weight gain rate of the oxidation reaction of the FeO content in the magnetite concentrate. FeO oxidation reaction formula:
Figure BDA0003534319110000061
144 16 160；
wherein the oxidation of the FeO content of the magnetite is the weight increasing process, and the weight increasing rate B of the FeO is 16/144 multiplied by 100 percent to 11.1 percent;
and S2, calculating the desulfurization efficiency of the magnetite concentrate. Oxidation reaction of S in iron ore concentrate:
4FeS 2 +11O 2 ↑＝2Fe 2 O 3 +8SO 2 ↑
4FeS+7O 2 ↑＝2Fe 2 O 3 +4SO 2 ↑
it can be seen that the oxidation of magnetite concentrate sulfur is a weight loss process, the above reaction requires-600 ℃ and the pellet roasting temperature-1250 ℃, so that only a small portion of pellet remains, the pellet usually contains about 0.005% of S, and when the sulfur content of the concentrate powder is 0.080%, the pellet desulfurization efficiency is (0.080-0.005) ÷ 0.080 × 100% — 93.74%;
and S3, determining the burning loss value of the bentonite.
Experiments and data examination show that the burning loss rate of the bentonite is 16 percent;
s4, calculating the dry ratio of the raw materials.
The proportion of each raw material of the on-site production line is generally wet-based proportion, and the proportion needs to be converted into dry-based proportion during calculation:
Figure BDA0003534319110000071
in the formula P i Is the dry basis proportion of the ith raw material, J i Is the wet basis proportion of the ith raw material, S i Is the moisture content of the i-th raw material,
Figure BDA0003534319110000072
multiplying the wet basis proportion of each raw material by the sum of (1-water content);
and S5, calculating the sintering amount of the pellet.
Weight gain coefficient Z of each concentrate powder Concentrate ore ＝[P i FeO content in x B x refined powder]- [ concentrate S content X pellet desulfurization efficiency]
Pellet weight gain coefficient Z Pellet of pellet ＝(∑Z Refined flour ) - (dry basis ratio of bentonite x burnout rate)
In the formula P i In terms of the dry basis proportion of the ith raw material, B represents the weight gain rate (11.1%) of FeO, the pellet desulfurization efficiency is 93.74% calculated in the step S2, and the burn-out rate of bentonite is 16% set in the step S3;
pellet firing amount Q ═ 1+ Z Pellet of pellet ；
And S6, calculating the theoretical components of the pellets.
Amount of TFe of pellet brought into each raw material ∑ TFe/amount of fired pellet Q
The rest (SiO) 2 、Al2O 3 、Zn、TiO 2 Alkali metals, etc.) and so on;
s7, calculating the proportion of the pelletizing mixture to 200 meshes
L i ＝P i ×A i
Pelletizing mixture in 200 mesh proportion
Figure BDA0003534319110000073
In the formula P i Is the dry basis proportion of the ith raw material, A i Is the proportion of the ith raw material to 200 meshes, and L is the proportion of the pelletizing mixture to 200 meshes, namely L is the sum of all the dry basis proportions of the materials multiplied by the proportion to 200 meshes. Similarly, the FeO content of the pelletizing mixture can be obtained;
s8, pelletizing mixture dry basis sulfur content and flue gas SO 2 Concentration prediction calculation
Fifthly, calculating the sulfur content of the pelletizing mixture on the dry basis
S i ＝P i ×s i
Dry basis S content of pelletizing mixture
Figure BDA0003534319110000081
In the formula P i Is the dry basis proportion of the ith raw material, s i The sulfur content is the i-th sulfur content, and S is the dry-basis sulfur content of the pelletizing mixture, namely S is the sum of all dry-basis mixture ratios of all materials multiplied by the sulfur content of the materials.
Sixth, flue gas SO 2 Concentration prediction calculation
SO in pellet flue gas 2 Mainly from concentrate powder, and a small part of flue gas SO from the pelletizing process of solid fuel-coal, and calculating total gas 2 Concentration, SO in exhausted flue gas 2 Almost 100% results from the oxidation of the concentrate powder S.
Amount of sulfur oxidation W per hour S Dry basis sulphur content of dry basis pellet amount (t/h) x pelletizing mixture (W x S) according to S and SO 2 MoleculeQuantitative relationship, S relative molecular weight 32, SO 2 The relative molecular weight is 64, and the calculated smoke SO per hour 2 Measurement of
Figure BDA0003534319110000082
In the formula M so2 Is SO 2 Relative molecular weight, M s Is the relative molecular weight of S, W S Is the amount of sulfur oxidation W per hour S Pellet gas SO 2 Concentration of
Figure BDA0003534319110000083
Wherein the smoke quantity of Q is the total smoke quantity of pellet per hour, N so2 For predicted pellet flue gas SO 2 Concentration in mg/m 3 ；
And S9, calculating the unit consumption of each raw material.
Figure BDA0003534319110000084
In the formula D i Is the unit consumption of the ith raw material, P i The dry basis proportion of the ith raw material is adopted;
and S10, calculating the cost of the raw materials.
C i Unit consumption of a certain raw material x unit price of the raw material D i ×X i
Figure BDA0003534319110000085
Example (b):
1. and calculating the weight gain rate of the oxidation reaction of the FeO content of the magnetite concentrate. FeO oxidation reaction formula:
2FeO+O 2 ↑＝Fe 2 O 3
144 16 160
the oxidation of the FeO content of magnetite is the weight gain process, and the FeO weight gain rate is 16 ÷ 144 × 100% ═ 11.1%.
2. Open EXCEL table.
3. As shown in figure 1, the wet ratio of each raw material, the physical and chemical indexes of the raw materials are input,Unit price, FeO weight gain (11.11%), bentonite burning loss value (generally set to be about 16%), and dry pellet amount in machine hour. Wherein the physical and chemical indexes of the raw materials mainly comprise: h 2 O、TFe、SiO 2 、Al 2 O 3 、S、FeO、P、TiO 2 、Na 2 O+K 2 O, Zn, -200 mesh ratio, etc.
4. As shown in FIG. 2, the output term formula of each ingredient model is set in the EXCEL table
4.1 set up the formula of converting the wet base ratio of each raw material into the dry base ratio in the EXCEL table.
Figure BDA0003534319110000091
In the formula P i Is the dry basis proportion of the ith raw material, J i Is the wet basis proportion of the ith raw material, S i Is the moisture content of the i-th raw material,
Figure BDA0003534319110000092
the wet base ratio of each raw material is multiplied by the sum of (1-water content).
4.2. Setting a formula of the sintering amount of the pellet
Weight gain coefficient Z of each concentrate powder Concentrate ore ＝[P i FeO content in x B x refined powder]- [ concentrate S content X pellet desulfurization efficiency]
Pellet weight gain coefficient Z Pellet of pellet ＝(∑Z Refined flour ) - (dry basis ratio of bentonite x burnout rate)
In the formula P i In terms of the dry basis proportion of the ith raw material, B represents the weight gain rate (11.1%) of FeO, the pellet desulfurization efficiency is 93.74% calculated in the step S2, and the burn-out rate of bentonite is 16% set in the step S3;
pellet firing amount Q ═ 1+ Z Pellet of pellet ；
4.3 setting a calculation formula of the theoretical components of the pellets.
TFe amount of pellet charged with various kinds of raw materials/pellet firing amount Q
The rest (SiO) 2 、Al 2 O 3 、Zn、TiO 2 Alkali metals, etc.) and so on.
4.4 setting the sulfur content and the flue gas SO of the pelletizing mixture on the dry basis 2 Concentration prediction calculation formula
Firstly, calculating the sulfur content of the pelletizing mixture on dry basis
S i ＝P i ×s i
Dry basis S content of pelletizing mixture
Figure BDA0003534319110000101
In the formula P i Is the dry basis proportion of the ith raw material, s i The sulfur content is the i-th sulfur content, and S is the dry-basis sulfur content of the pelletizing mixture, namely S is the sum of all dry-basis mixture ratios of all materials multiplied by the sulfur content of the materials.
② flue gas SO 2 Concentration prediction calculation
Amount of sulfur oxidation W per hour S Dry basis pellet amount (t/h) x pelletizing mixture dry basis sulfur content W x S flue gas per hour 2 Measurement of
Figure BDA0003534319110000102
In the formula M so2 Is SO 2 Relative molecular weight, M s Is the relative molecular weight of S, W S Is the amount of sulfur oxidation W per hour S Pellet flue gas SO 2 Concentration of
Figure BDA0003534319110000103
Wherein the smoke quantity of Q is the total smoke quantity of pellet per hour, N so2 For predicted pellet flue gas SO 2 Concentration in mg/m 3 。
4.5 compiling pelletizing mixture-200 mesh ratio calculation
L i ＝P i ×A i
Pelletizing mixture in 200 mesh proportion
Figure BDA0003534319110000104
In the formula P i Is of the ith kindRaw material dry basis ratio, A i Is the proportion of the ith raw material to 200 meshes, and L is the proportion of the pelletizing mixture to 200 meshes, namely L is the sum of all the dry basis proportions of the materials multiplied by the proportion to 200 meshes. The same theory is used to compile a formula for calculating the FeO content of the pelletizing mixture
4.6 compiling a unit consumption calculation formula of each raw material.
Figure BDA0003534319110000105
In the formula D i Is the unit consumption of the ith raw material, P i Is the dry basis proportion of the ith raw material.
4.7 compiling a raw material cost calculation formula.
C i Unit consumption of a certain raw material x unit price of the raw material D i ×X i
Figure BDA0003534319110000111
In the formula D i Is the unit consumption of the ith raw material, X i Is the unit price of the ith raw material.
4.8 changing the proportion and the components of the raw materials, and outputting the theoretical components of the pellet ore, the proportion of-200 of the pelletizing mixture, the FeO content of the pelletizing mixture (influencing the energy consumption of the working procedure) and the SO of the flue gas through the ore blending model 2 And the calculation results of concentration, cost and the like are used for evaluating the ore blending structure of the pellet from multiple angles and multiple functions such as pellet quality, bentonite unit consumption, process energy consumption, environmental protection, cost and the like.
In conclusion, the multifunctional pellet blending model building method is based on the oxidizing roasting theory of the magnetite concentrate pellet, the multifunctional pellet blending model is designed, besides the calculation of a plurality of main components and raw material consumption cost of the pellet, the adaptability of the pellet blending model to the magnetite concentrates with different FeO contents, different raw material-200-mesh proportions, different raw material S contents and different alkali metal contents is improved, the comprehensiveness and the accuracy of the pellet blending model in pellet quality prediction are improved, and the pellet blending structure is subjected to multi-angle multifunctional evaluation from pellet quality, bentonite unit consumption, process energy consumption, environmental protection, cost and the like.
The building method of the multifunctional pellet blending model is based on the oxidation chemical reaction of the magnetite concentrate pellets, the oxidation reaction heat release corresponding to the magnetite concentrates with different FeO contents and the weight gain rate of finished pellets are calculated, the influence of the FeO content of the magnetite concentrate pellets on pellet components and process energy consumption is determined, and the adaptability of the pellet blending model to the magnetite concentrates with different FeO contents and the accuracy of cost prediction are improved.
The multifunctional pellet blending model building method reads the proportion of each raw material of pellets to 200 meshes, calculates the proportion of pelletizing mixture to 200 meshes, increases the analysis function of the pellet blending model on the consumption of bentonite, and improves the adaptability of the pellet blending model to different raw material to 200 meshes and the accuracy of cost prediction.
The method for building the multifunctional ore blending model of the pellet comprises the steps of reading the S content of each raw material of the pellet, calculating the S content of pelletizing mixture, and predicting pellet flue gas SO according to the flue gas amount and the oxidation reaction of sulfide in the pellet roasting process 2 The concentration provides basis for ultralow emission of flue gas generated in pellet production, environmental protection accidents are avoided, the adaptability of the pellet batching model to the contents of S in different raw materials is improved, the alkali metal content of the pellets is calculated by reading the alkali metal content of each raw material of the pellets, the change condition of the reduction expansion rate of the pellets is predicted, and the comprehensiveness and the accuracy of the pellet batching model to pellet quality prediction are improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (1)

1. A multifunctional ore blending model building method for pellet ore is characterized by comprising the following steps: the specific operation is as follows:
and S1, calculating the weight gain rate of the oxidation reaction of the FeO content of the magnetite concentrate. FeO oxidation reaction formula:
Figure FDA0003534319100000011
144 16 160；
wherein the oxidation of the FeO content of the magnetite is the weight increasing process, and the weight increasing rate B of the FeO is 16/144 multiplied by 100 percent to 11.1 percent;
and S2, calculating the desulfurization efficiency of the magnetite concentrate. Oxidation reaction of S in iron ore concentrate:
4FeS 2 +11O 2 ↑＝2Fe 2 O 3 +8SO 2 ↑
4FeS+7O 2 ↑＝2Fe 2 O 3 +4SO 2 ↑
it can be seen that oxidation of magnetite concentrate sulfur is a weight loss process, the above reaction requires-600 ℃, and the pellet roasting temperature is-1250 ℃, so that only a small part of pellet remains, the pellet usually contains about 0.005% of S, and when the concentrate powder contains 0.080% of sulfur, the pellet desulfurization efficiency is (0.080-0.005) ÷ 0.080 × 100% — 93.74%;
and S3, determining the burning loss value of the bentonite.
Experiments and data examination show that the burning loss rate of the bentonite is 16 percent;
s4, calculating the dry ratio of the raw materials.
The proportion of each raw material of the on-site production line is generally wet-based proportion, and the proportion needs to be converted into dry-based proportion during calculation:
Figure FDA0003534319100000012
in the formula P i Is the dry basis proportion of the ith raw material, J i Is the wet basis proportion of the ith raw material, S i Is the moisture content of the i-th raw material,
Figure FDA0003534319100000013
multiplying the wet basis proportion of each raw material by the sum of (1-water content);
and S5, calculating the sintering amount of the pellet.
Weight gain coefficient Z of each concentrate powder Concentrate ore ＝[P i FeO content in x B x refined powder]- [ concentrate S content X pellet desulfurization efficiency]
Pellet weight gain coefficient Z Pellet of pellet ＝(∑Z Refined flour ) - (dry basis ratio of bentonite x burnout rate)
In the formula P i The dry-basis proportion of the ith raw material is B, the weight gain rate of FeO (11.1%), the pellet desulfurization efficiency is 93.74% calculated in the step S2, and the bentonite burnout rate is 16% set in the step S3;
pellet firing amount Q ═ 1+ Z Pellet of pellet ；
And S6, calculating the theoretical components of the pellets.
TFe amount of pellet charged with various kinds of raw materials/pellet firing amount Q
The rest (SiO) 2 、Al 2 O 3 、Zn、TiO 2 Alkali metals, etc.) and so on;
s7, calculating the proportion of the pelletizing mixture to 200 meshes
L i ＝P i ×A i
Pelletizing mixture in 200 mesh proportion
Figure FDA0003534319100000021
In the formula P i Is the dry basis proportion of the ith raw material, A i Is the proportion of the ith raw material to 200 meshes, and L is the proportion of the pelletizing mixture to 200 meshesFor example, L is the sum of all dry basis ratios of the materials multiplied by their-200 mesh ratio.
Similarly, the FeO content of the pelletizing mixture can be obtained;
s8, pelletizing mixture dry basis sulfur content and flue gas SO 2 Concentration prediction calculation
Firstly, calculating the sulfur content of the pelletizing mixture on dry basis
S i ＝P i ×s i
Dry basis S content of pelletizing mixture
Figure FDA0003534319100000022
In the formula P i Is the dry basis proportion of the ith raw material, s i The sulfur content is the i-th sulfur content, and S is the dry-basis sulfur content of the pelletizing mixture, namely S is the sum of all dry-basis mixture ratios of all materials multiplied by the sulfur content of the materials.
② flue gas SO 2 Concentration prediction calculation
SO in pellet flue gas 2 Mainly from concentrate powder, and a small part of flue gas SO from the pelletizing process of solid fuel-coal, and calculating total gas 2 Concentration, SO in exhausted flue gas 2 Almost 100% results from the oxidation of the concentrate powder S.
Amount of sulfur oxidation W per hour S Dry basis of pelletizing mixture (t/h) x dry basis sulphur content W x S
According to S and SO 2 Molecular weight relationship, S relative molecular weight 32, SO 2 The relative molecular weight is 64, and the calculated smoke SO per hour 2 Measurement of
Figure FDA0003534319100000023
In the formula M so2 Is SO 2 Relative molecular weight, M s Is the relative molecular weight of S, W S Is the amount of sulfur oxidation W per hour S
Pellet gas SO 2 Concentration of
Figure FDA0003534319100000031
Wherein the smoke quantity of Q is the total smoke quantity of pellet per hour, N so2 For predicted pellet flue gas SO 2 Concentration in mg/m 3 ；
And S9, calculating the unit consumption of each raw material.
Figure FDA0003534319100000032
In the formula D i Is the unit consumption of the ith raw material, P i The dry basis proportion of the ith raw material is adopted;
and S10, calculating the cost of the raw materials.
C i Unit consumption of a certain raw material x unit price of the raw material D i ×X i
Figure FDA0003534319100000033
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116759032A (en) * 2023-08-16 2023-09-15 安徽慕京信息技术有限公司 Optimization method for blast furnace steelmaking raw material proportion and application system thereof

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116759032A (en) * 2023-08-16 2023-09-15 安徽慕京信息技术有限公司 Optimization method for blast furnace steelmaking raw material proportion and application system thereof
CN116759032B (en) * 2023-08-16 2023-10-31 安徽慕京信息技术有限公司 Optimization method for blast furnace steelmaking raw material proportion and application system thereof

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