CN114085938A - Process for smelting limestone type fluorine-containing fluxed pellets under high-pellet-ratio condition of large blast furnace - Google Patents
Process for smelting limestone type fluorine-containing fluxed pellets under high-pellet-ratio condition of large blast furnace Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
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- C21B5/008—Composition or distribution of the charge
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Abstract
The invention discloses a process for smelting limestone type fluorine-containing fluxed pellets under the condition of high pellet ratio of a large blast furnace, which comprises the following steps: independently loading sintered ore, limestone type fluorine-containing flux pellets, acid pellets, coke and silica into a receiving tank, controlling the proportion of the four materials by controlling the process parameters of a vibrating screen and a batching facility on the receiving tank, discharging each material into a feeding belt according to a set proportion, and then conveying the materials into a receiving ore tank at the top of a furnace; the loading amount of the materials comprises: the batch weight of ore is 47-50 t/batch, the batch weight of coke is 12.0-13.0 t/batch, and the batch weight of silica is 0-0.6 t/batch; the proportion of the iron material of the ore batch is controlled as follows: the proportion of the agglomerate is 45-50%, the proportion of the acid pellet is 15-20%, and the proportion of the limestone type fluorine-containing melting agent pellet is 30-35%. The method determines that the optimum value is 1500m2An operation system for smelting limestone type fluorine-containing fluxing pellets under the condition of blast furnace blast ball ratio.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a process for smelting limestone type fluorine-containing fluxed pellets under the condition of high pellet ratio of a large-scale blast furnace.
Background
770 million tons of Bayan Obo iron ore concentrates produced annually belong to ultrafine-granularity magnet ore concentrates, the proportion of 200 meshes is more than 90 percent, and the proportion of 325 meshes is more than 75 percent, so the method is more suitable for pellet production compared with the method for sintering raw materials. But because harmful elements such as potassium, sodium, fluorine and the like are contained at the same time, the reduction expansion rate of the pellet ore is high, the proportion of the special bayan obo concentrate ore cannot exceed 35 percent when the acid pellet ore is produced, and the problem that how to improve the large-proportion application of the bayan obo iron concentrate ore in the pellet production is needed to be solved urgently for steel cladding. Previous studies have shown that: the reduction expansion rate of the pellet prepared by using a large proportion of baiyuneboite concentrate can be inhibited by carrying out the production of the melt pellet.
Compared with the sintering process, the energy consumption of the oxidized pellet process is only half of that of the sintering process; the pellet ore has high iron-containing grade, is beneficial to improving the output of the blast furnace and reducing the fuel ratio; the emission of pollutants such as NOx, dioxin and the like is reduced, so that the proportion of the pellets in the raw materials of the blast furnace is improved, the active improvement of the quality of the pellets is an important direction for realizing iron-making concentrate, saving energy and reducing emission, and the requirements of environment-friendly and efficient upgrading of iron-making are met.
In 6 middle of the month in 2020, a company stops the production of a 2# machine according to the regional emission reduction requirement, a gap of nearly 6000t every day appears in the sintered ore of the whole company, and in order to ensure the structural balance of the raw materials charged into a blast furnace, an iron-making part of an iron-making plant gradually improves the proportion of the acid pellets to replace the shortage of the sintered ore. The industrial test is mainly carried out in a large-scale blast furnace (No. 5), and the proportion of the pellets fed into the furnace is gradually increased from 23 percent to 50 percent. From the overall test results, the yield is basically stabilized at 3850t/d, but the yield is also reduced slightly due to the influence of factors such as the improvement of the pellet proportion, the adjustment of the distribution system, the adjustment of the slag alkalinity, the increase of the coke ratio by theoretical calculation (the current limestone proportion is 1.5 t/batch), and the like, and the fuel ratio is high. The method shows that the blast furnace smelting is not favorable by completely using the acidic pellet ore under the high-ball-ratio smelting condition.
In order to improve the comprehensive feeding grade and technical economic indexes of a large-scale blast furnace under the condition of high-sphericity ratio smelting and reduce the addition of limestone, the technical research of smelting alkaline pellets in the large-scale blast furnace is required, and the exploration of a proper operation system and a charge material structure is imperative.
Disclosure of Invention
In order to solve the above technical problems, the present invention provides a 1500m optical fiber cable2The method for smelting limestone type fluorine-containing fluxed pellets under the condition of high pellet ratio of blast furnace determines that the method is suitable for 1500m2An operation system for smelting limestone type fluorine-containing fluxing pellets under the condition of blast furnace blast ball ratio.
In order to solve the technical problems, the invention adopts the following technical scheme:
the invention relates to a process for smelting limestone type fluorine-containing fluxed pellets under the condition of high pellet ratio of a large blast furnace, which comprises the following steps:
independently loading sintered ore, limestone type fluorine-containing flux pellets, acid pellets, coke and silica into a receiving tank, controlling the proportion of the four materials by controlling the process parameters of a vibrating screen and a batching facility on the receiving tank, discharging each material into a feeding belt according to a set proportion, and then conveying the materials into a receiving tank at the top of a furnace; the loading amount of the materials comprises: the batch weight of ore is 47-50 t/batch, the batch weight of coke is 12.0-13.0 t/batch, and the batch weight of silica is 0-0.6 t/batch; the proportion of the iron material of the ore batch is controlled as follows: the proportion of the agglomerate is 45-50%, the proportion of the acid pellet ore is 15-20%, and the proportion of the limestone type fluorine-containing melting agent pellet ore is 30-35%.
Further: the quality control requirements of the limestone type fluorine-containing fluxed pellets are as follows: TFe is more than or equal to 62.0 percent, FeO content is less than 0.5 percent, S content is less than 0.15 percent, MgO content is more than or equal to 1.0 percent, SiO2The content is less than or equal to 3.5 percent, the content of F is less than or equal to 0.30 percent, and ROMore than or equal to 1.0, the compressive strength more than or equal to 2200N/P, the drum strength more than or equal to 96 percent and the abrasion resistance index less than or equal to 3.5 percent.
Further: the quality control requirements of the acid pellets are as follows: TFe is more than or equal to 61.5 percent, FeO content is less than 1.0 percent, S content is less than 0.05 percent, and SiO2The content is less than or equal to 5.5 percent, the content of F is less than or equal to 0.05 percent, and RONot more than 0.3 percent, the compressive strength not less than 2200N/P, the drum strength not less than 96 percent and the abrasion resistance index not more than 3.0 percent.
Further: the sintered mineral mass control requirements are as follows: more than or equal to 55.5.0 percent of TFe, 8 to 9 percent of FeO, less than 0.03 percent of S, 2.0 to 2.2 percent of MgO and SiO2The content is 5.0 to 5.2 percent, and the content of F is less than or equal to0.15％， RO2.10 +/-0.05 and the drum strength is more than or equal to 78 percent.
Further: the coke quality control requirements are as follows: the ash content is less than or equal to 13.5 percent, the S content is less than or equal to 0.95 percent, the volatile matter is less than or equal to 1.5 percent, the reactivity is less than or equal to 28.0 percent, and the strength after reaction is more than or equal to 67.0 percent.
Further: the silica control requires: SiO 22The content is more than or equal to 95.0 percent.
Further: and (3) loading each batch into the blast furnace through a furnace top distributor according to a distribution matrix.
Further: the blast furnace matrix is shown in table 1:
TABLE 1 blast furnace matrix
Further: and blowing hot air into the blast furnace from the tuyere according to an air supply system.
Further: the air supply system has the control requirements that: the air volume is 3150m3/min～3250m3/min, air-blast kinetic energy of 8100kg (f) -9100 kg (f), furnace top pressure of 0.190-0.200 MPa, air permeability index of 1.95-2.10, hot air pressure of 0.349-0.355 MPa, hot air temperature of 1180 +/-5.0 ℃, oxygen enrichment rate of 3.35-3.80%, comprehensive load of 2.65-2.80, and coal gas utilization rate of 40.00-42.50%.
Further: under the smelting condition that the charging proportion of the charged baiyuneboio fluorine-containing iron ore concentrate is 47 to 51 percent, the proper heat system and slagging system for the limestone type fluorine-containing melting pellets smelted by the large-scale blast furnace are proved, and the heat system control requirement is as follows: the temperature of molten iron is not less than 1480 ℃, [ Si ]]The content is less than or equal to 0.550 percent and the content is S]The content is less than or equal to 0.040%; the control requirements of the slagging system are as follows: free basicity of 1.15 +/-0.05 and Al2O3The content is less than or equal to 13.0 percent, the MgO content is 9.0 to 9.5 percent, and K20.35 to 0.50 percent of O and Na2O content of 0.60％～0.80％。
Compared with the prior art, the invention has the beneficial technical effects that:
the technical result of smelting 30-35% limestone type fluorine-containing fluxing pellets under the condition of 50% pellet ratio of a large blast furnace is obtained, and the result proves that the blast furnace is stable and smooth in furnace condition and the fuel ratio is reduced through accurate and efficient operation system adjustment.
Detailed Description
The following examples further illustrate embodiments of the present invention, but the embodiments of the present invention are not limited to the following examples.
1500m are utilized in various embodiments3When limestone type fluorine-containing fluxed pellets are smelted in a blast furnace, the structure of the furnace charge, the distribution system, the components of the raw materials, the process parameters, the operation system and the smelting indexes are respectively shown in tables 2 to 9.
TABLE 2 structural changes in the charge of a large-sized blast furnace during the practice of the invention
| Example numbering | Proportioning limestone type fluxed pellets% | Acid pellet ore ratio, percent | Ratio of sinter ore% |
| Comparative example | - | 50 | 50 |
| Example 1 | 35 | 15 | 50 |
| Example 2 | 30 | 15 | 55 |
| Example 3 | 30 | 16 | 54 |
| Example 4 | 32 | 18 | 50 |
As can be seen from Table 2:
during the implementation period of the invention, the proportion of the sintering ore fed into the large-scale blast furnace is 50-55 percent, the proportion of the limestone type melting agent pellets is 30-35 percent, the proportion of the acid pellets is 15-18 percent, and the alkalinity of the furnace slag is 1.15 +/-0.05.
TABLE 3 adjustment of the stock distribution system during the practice of the invention
As can be seen from Table 3:
during the implementation of the invention, in order to overcome the characteristic of easy rolling of the pellets, the ore is mainly distributed in the middle ring belt, the central coke addition ratio is increased, the center and the edge are loosened, and the stability of two air flows is ensured.
TABLE 4 sinter composition and Properties during the practice of the invention
As can be seen from Table 4: during the implementation of the invention, the quality index of the sintered ore used by the blast furnace is stable.
TABLE 5 composition and Properties of acid pellets during the practice of the invention
As can be seen from Table 5: during the implementation period of the invention, the quality index of the acid pellets used by the blast furnace is stable.
TABLE 6 ingredients and Properties of limestone type fluorine-containing fluxing pellets during the practice of the invention
As can be seen from Table 6: during the implementation of the invention, the chemical components of the finished product ball are stable, the TFe mean value of the pellet ore is about 62.61 percent, the CaO content mean value is 3.39 percent, and SiO is2The average content was 3.18%, the F content was 0.21%, and the average alkalinity was 1.08. The TFe of limestone type fluxed pellets is improved by 0.16 percent compared with acid pellets; the average value of the FeO content is reduced by 1.29 percent compared with that of the acid pellets; the average CaO content is improved by 1.88 percent compared with the acid pellets; SiO 22The content average value is reduced by 1.88 percent compared with the acid pellets; the alkalinity is improved by 0.78 compared with the acidity pellet. Due to the fluorine-philic and sulfur-fixing characteristics of the fluxed pellets, the average value of S content residue is 0.09%, and the average value is improved by 0.086 percent compared with that of the acid pellets; the average value of the F content residual quantity is 0.20 percent, which is improved by 0.14 percent compared with the acid pellet. Cold strength of limestone type fluxed pelletThe smelting requirement of a large-scale blast furnace can be met by the aid of the smelting furnace and the metallurgical performance.
TABLE 7 Coke Performance during the practice of the invention%
As can be seen from Table 7: during the implementation of the invention, the sintered mineral quality index used by the blast furnace is overall stable.
TABLE 8 blast furnace thermal schedule during the practice of the invention
As can be seen from Table 8: during the project, the furnace temperature is sufficient, and the pig iron sulfur is slightly increased.
TABLE 9 blast furnace slagging System during the practice of the invention
As can be seen from Table 9: during the project implementation, the free alkalinity of the slag is 1.15 +/-0.05, the MgO content of the slag is 9.1-9.4%, and the sulfur content in the slag is in a trend of increasing.
TABLE 10 important technical parameters during the implementation of the invention
As can be seen from table 10: under the conditions that the proportion of the pellets entering the furnace is stabilized at 50 percent and the proportion of the fluorine-containing iron ore concentrate entering the furnace is increased by about 13 percent, all the technological parameters are stable.
TABLE 11 blast furnace technical economic indicators during the practice of the invention
As can be seen from Table 11: during the implementation of the invention, a basic process system for smelting the fluxed pellets in a large blast furnace under the condition of 45-50% of pellet ratio is formed, and under the condition that the proportion of the pellets entering the furnace is stabilized at 50% and the proportion of the fluorine-containing iron concentrate entering the furnace is increased by about 13%, the technical economic index of the limestone type fluorine-containing fluxed pellets smelted in the large blast furnace coated with steel is superior to that of the comparative proportion of the smelted acid pellets, thereby achieving a better level, wherein the yield is increased by 4.07t/d, the fuel ratio is reduced by 19.04kg/t, and the coke ratio is reduced by 6.54 kg/t.
The above-mentioned embodiments are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (9)
1. A process for smelting limestone type fluorine-containing fluxed pellets under the condition of high pellet ratio of a large blast furnace is characterized by comprising the following steps: the method comprises the following steps: independently loading sintered ore, limestone type fluorine-containing flux pellets, acid pellets, coke and silica into a receiving tank, controlling the proportion of the four materials by controlling the process parameters of a vibrating screen and a batching facility on the receiving tank, discharging each material into a feeding belt according to a set proportion, and then conveying the materials into a receiving ore tank at the top of a furnace; the loading amount of the materials comprises: the batch weight of ore is 47-50 t/batch, the batch weight of coke is 12.0-13.0 t/batch, and the batch weight of silica is 0-0.6 t/batch; the proportion of the iron material of the ore batch is controlled as follows: the proportion of the agglomerate is 45-50%, the proportion of the acid pellet is 15-20%, and the proportion of the limestone type fluorine-containing melting agent pellet is 30-35%.
2. The process for smelting limestone type fluorine-containing fluxed pellets under the condition of the blast furnace blast ball ratio as claimed in claim 1, which is characterized in that: the quality control requirements of the limestone type fluorine-containing fluxed pellets are as follows: TFe is more than or equal to 62.0 percent, FeO content is less than 0.5 percent, S content is less than 0.15 percent, MgO content is more than or equal to 1.0 percent, and SiO2The content is less than or equal to 3.5 percent, the content of F is less than or equal to 0.30 percent, RO is more than or equal to 1.0, the compressive strength is more than or equal to 2200N/P, the drum strength is more than or equal to 96 percent, and the abrasion resistance index is less than or equal to 3.5 percent.
3. The process for smelting limestone type fluorine-containing fluxed pellets under the condition of the blast furnace blast ball ratio as claimed in claim 1, which is characterized in that: the quality control requirements of the acid pellets are as follows: TFe is more than or equal to 61.5 percent, FeO content is less than 1.0 percent, S content is less than 0.05 percent, SiO2The content is less than or equal to 5.5 percent, the content of F is less than or equal to 0.05 percent, RO is less than or equal to 0.3 percent, the compressive strength is more than or equal to 2200N/P, the drum strength is more than or equal to 96 percent, and the abrasion resistance index is less than or equal to 3.0 percent.
4. The process for smelting limestone type fluorine-containing fluxed pellets under the condition of the blast furnace blast ball ratio as claimed in claim 1, which is characterized in that: the sintered mineral mass control requirements are as follows: more than or equal to 55.5.0 percent of TFe, 8 to 9 percent of FeO, less than 0.03 percent of S, 2.0 to 2.2 percent of MgO and SiO2The content is 5.0-5.2%, the F content is less than or equal to 0.15%, the RO is 2.10 +/-0.05, and the drum strength is more than or equal to 78%.
5. The process for smelting limestone type fluorine-containing fluxed pellets under the condition of the blast furnace blast ball ratio as claimed in claim 1, which is characterized in that: the coke quality control requirements are as follows: the ash content is less than or equal to 13.5 percent, the S content is less than or equal to 0.95 percent, the volatile matter is less than or equal to 1.5 percent, the reactivity is less than or equal to 28.0 percent, and the strength after reaction is more than or equal to 67.0 percent.
6. The process for smelting limestone type fluorine-containing fluxed pellets under the condition of the blast furnace blast ball ratio as claimed in claim 1, which is characterized in that: the silica control requires: SiO 22The content is more than or equal to 95.0 percent.
7. The process for smelting limestone type fluorine-containing fluxed pellets under the condition of the blast furnace blast ball ratio as claimed in claim 1, which is characterized in that: and (3) loading each batch into the blast furnace through a furnace top distributor according to a distribution matrix.
8. The process for smelting limestone type fluorine-containing fluxed pellets under the condition of the blast furnace blast ball ratio as claimed in claim 1, which is characterized in that: and (3) controlling the air supply system: the air flow is 3150m3/min to 3250m3/min, the air-blowing kinetic energy is 8100kg (f) m/s to 9100kg (f) m/s, the furnace top pressure is 0.190MPa to 0.200MPa, the air permeability index is 1.95 to 2.10, the hot air pressure is 0.349MPa to 0.355MPa, the hot air temperature is 1180 +/-5.0 ℃, the oxygen enrichment rate is 3.35 percent to 3.80 percent, the comprehensive load is 2.65 to 2.80, and the coal gas utilization rate is 40.00 to 42.50 percent.
9. The process for smelting limestone type fluorine-containing fluxed pellets under the condition of the blast furnace blast ball ratio as claimed in claim 1, which is characterized in that: under the smelting condition that the charging proportion of the charged baiyuneboio fluorine-containing iron ore concentrate is 47 to 51 percent, the proper thermal system and slagging system for large-scale blast furnace smelting of limestone type fluorine-containing melting pellets are proved, and the thermal system control requirements are as follows: the temperature of molten iron is not less than 1480 ℃, [ Si ]]The content is less than or equal to 0.550 percent and the content is S]The content is less than or equal to 0.040%; the control requirement of the slagging system is as follows: free basicity of 1.15 +/-0.05 and Al2O3The content is less than or equal to 13.0 percent, the MgO content is 9.0 to 9.5 percent, and K20.35 to 0.50 percent of O and Na2The content of O is 0.60 to 0.80 percent.
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| CN115386666A (en) * | 2022-09-15 | 2022-11-25 | 包头钢铁（集团）有限责任公司 | Method for increasing yield and reducing consumption of blast furnace under smelting condition of special Baiyunebo ore |
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