Process for removing titanium from sintered ore powder outside blast furnace molten iron

Abstract

The invention relates to the technical field of blast furnace ironmaking, and discloses a process for removing titanium from sintered ore powder outside a blast furnace molten iron furnace, which comprises the following steps: collecting sintered ore return powder from sintered ore screen underflow, sampling, rechecking the FeO content, and putting into a titanium-removing automatic feeding device after ensuring that the requirements are met. The blast furnace operator pre-estimates the titanium content in the molten iron, and notifies a stokehold team; and uniformly adding sintered ore return powder into the molten iron trough through an automatic feeding device according to the estimated titanium content. FeO in the return powder of the sintered ore and Ti in the molten iron are fully mixed and react by utilizing potential energy of height difference of the molten iron falling into the molten iron tank, titanium oxide is generated and separated out, and slag is separated from the molten iron; the molten iron components are detected in a laboratory, and the input amount of the titanium removal agent is finely adjusted by a stokehole worker to ensure that the titanium content meets the standard. According to the process, the returned sintered ore powder serves as a titanium removal agent, the cost is low, the titanium removal cost of each ton of molten iron is reduced by 20.84 yuan, the adding mode is simple, manual operation is reduced, the production efficiency is improved, the returned sintered ore powder components are stable, the titanium removal effect is predicted, the component fluctuation influence is reduced, and potential safety hazards are reduced through an automatic feeding device.

Description

Technical Field

[0001] The invention belongs to the technical field of blast furnace ironmaking, and in particular relates to a titanium removal process for sintered ore powder outside a blast furnace molten iron. Background Art

[0002] In the blast furnace ironmaking process, the titanium content in the molten iron has an important impact on the subsequent cast pipe production. Too high a titanium content will cause defects in the cast pipe and affect the quality of the product. Therefore, the research and application of the out-of-furnace titanium removal process is of great significance to ensure the quality of cast pipe products and improve production efficiency.

[0003] Traditional detitanium methods include using nitrides, iron ore concentrate containing FeO, etc. as detitanium agents, but these methods have problems such as high cost, complex operation, high labor intensity and potential safety hazards.

[0004] Although traditional titanium removal agents such as nitrides have good titanium removal effects, they are expensive and uneconomical. Iron concentrate containing FeO needs to be dried before adding, and the warehouse is prone to bulging during the addition process, which makes the operation difficult. The use of traditional titanium removal agents requires a lot of manual operation, which increases the labor intensity of workers. There is a risk of explosion during the operation of traditional titanium removal agents, which poses a safety hazard.

[0005] The composition of traditional de-titanium agents is unstable, which affects the stability of the de-titanium effect. The quality of the sintered ore powder from the blast furnace fluctuates greatly, which is affected by the type of lump ore and the size of the powder, especially the fluctuation of FeO content, which has an adverse effect on the de-titanium effect.

[0006] In view of the defects of the prior art, a titanium removal process for sintered ore powder outside the blast furnace molten iron using sintered ore powder as a titanium removal agent is proposed. Summary of the invention

[0007] The present invention aims to solve the technical problems that the current detitanium agents such as nitrides in the above-mentioned prior art have good detitanium effect but are very expensive; the detitanium agent for iron ore concentrate containing FeO needs to be dried before adding, is easy to bulge when adding, has high labor intensity, and has the risk of explosion, and has unstable ingredients and high prices.

[0008] To achieve the above object, the present invention provides the following technical solutions:

[0009] A titanium removal process for sintered ore powder outside a blast furnace molten iron furnace specifically comprises the following steps:

[0010] S1. Preparation of de-titanium agent: Collect the sintered ore powder from the sieve of the sintered ore, take samples of the sintered ore powder, and send it to the laboratory for re-testing of the FeO content m% value; ensure that it meets the use requirements; after confirming that the quality meets the requirements, put the sintered ore powder into the de-titanium automatic feeding device next to the blast furnace iron ditch for standby use;

[0011] S2. Estimation of titanium content in molten iron: The blast furnace foreman estimates the titanium content in molten iron during the tapping process and notifies the furnace front team of the estimated results;

[0012] S3. Addition of de-titanium agent: After the furnace front team receives the estimated titanium content in the molten iron from the blast furnace foreman, when the titanium content in the blast furnace molten iron is between 0.06% and 0.085%, the furnace front team, based on the estimated titanium content, evenly adds de-titanium agent, i.e., sintered ore powder, into the molten iron ditch through the de-titanium automatic feeding device during the iron tapping process;

[0013] S4, titanium removal reaction: FeO in the sintered ore powder and Ti in the molten iron use the potential energy of the height difference of the molten iron falling into the molten iron tank to fully mix and react, generating titanium oxide that precipitates from the molten iron, forming slag that is separated from the molten iron, thereby achieving titanium removal;

[0014] S5. Composition testing and adjustment: The molten iron is sent to the laboratory for composition testing. According to the composition of the molten iron shown in the test results, the foreman in front of the furnace will fine-tune the amount of detitanium agent added to ensure that the titanium content in the molten iron meets the standards for molten iron for cast pipes and the detitanium cost is optimal.

[0015] Preferably, in step S1, the particle size of the sintered ore powder is controlled between 2 mm and 5 mm. When the sintered ore powder is used as a de-titanium agent, if the particle size is greater than 5 mm, it will cause a waste of cost when used as a desulfurization agent. If the particle size is less than 2 mm, there will be a lot of dust during the addition process and the FeO content is insufficient, resulting in poor de-titanium effect.

[0016] Preferably, in step S3, 9.8 kg of detitanium agent needs to be added to remove 0.01% of Ti per ton of molten iron.

[0017] Preferably, the m% value is the content of FeO in the sintered ore powder, and the FeO content m% value that meets the use requirements is 8% to 10%. When the FeO content in the sintered ore powder is greater than 10%, although the detitanium effect is good, the sintering cost is high; when the FeO content in the sintered ore powder is less than 8%, the detitanium effect is reduced, and the strength of the sintered ore is also reduced, which is not conducive to the smooth operation of the blast furnace.

[0018] Preferably, the deputy foreman of the blast furnace observes the iron-tapping process every day and visually estimates the silicon and titanium content in the molten iron with an accuracy of 80%, thereby improving the accuracy of visually observing the silicon and titanium content in the molten iron, or uses an online monitor for the silicon content in molten iron to further improve the detection accuracy and process stability.

[0019] Preferably, the automatic titanium removal feeding device includes a bracket, a charging hopper, four electric rollers arranged at the four corners of the bottom of the bracket, a weighing sensor connecting the charging hopper and the bracket, and a steel rail that cooperates with the electric rollers to guide the rolling and drive the bracket and the charging hopper to move; the bracket and the charging hopper are sent to the iron water ditch through the cooperation of the electric rollers and the guide rails, and the titanium removal agent is added to the iron water ditch by opening the flow valve on the feeding spout on the charging hopper.

[0020] Preferably, a weighing display, a distribution box and an active power socket electrically connected to the weighing sensor are installed on the bracket. Through the connection between the weighing sensor and the weighing display, the remaining amount of the material in the container can be monitored in real time, and the material feeding nozzle, the flow valve and the external control device can be used to automatically complete the material discharge action, avoiding the instability and error of manual operation. The distribution box and the active power socket provide power support. Through such connection and working principle, the device can accurately weigh the weight of the titanium removal material and realize automatic control.

[0021] Compared with the prior art, the technical effects and advantages of the present invention are:

[0022] The titanium removal process of sintered ore powder outside the blast furnace uses sintered ore powder as a titanium removal agent, which is cheaper than traditional nitrides and iron concentrate containing FeO. Sintered ore powder is a by-product with a lower acquisition cost, thereby reducing the cost of titanium removal.

[0023] The method of adding sintered ore return powder is simple, and it can be added evenly through the automatic feeding device, which reduces the difficulty of operation and labor intensity. The sintered ore return powder does not need pretreatment such as drying, which reduces the complexity of the operation process. Since the method of adding sintered ore return powder is simple, the labor intensity of workers is reduced and the production efficiency is improved.

[0024] The composition of sintered ore powder is relatively stable, and its de-titaniumization effect can be predicted, reducing the de-titaniumization instability caused by composition fluctuations. As a by-product of the blast furnace, the supply of sintered ore powder is sufficient and stable, providing a guarantee for continuous production. The application of de-titaniumization technology increases the amount of qualified molten iron and ensures the on-time delivery of thin-walled tubes.

[0025] Traditional titanium removal methods have safety risks, such as the risk of blasting, but this process reduces these risks through automated equipment. Using sintered ore return powder as a titanium removal agent can reduce pollution to the environment because it does not require pretreatment processes such as drying, reducing energy consumption and emissions.

[0026] Overall, this process provides the ironmaking industry with a more economical, efficient, stable and environmentally friendly off-furnace titanium removal method by reducing costs, improving efficiency and stability, simplifying operations and increasing safety while ensuring the quality of cast pipe products. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic structural diagram of the automatic feeding device for titanium removal of the present invention;

[0028] Figure 2 For the present invention Figure 1 Schematic diagram of the structure after the middle rail is removed.

[0029] In the figure: 1. bracket; 2. loading hopper; 3. electric roller; 4. weighing sensor; 5. rail; 6. feeding nozzle; 7. flow valve; 8. weighing display; 9. distribution box; 10. movable power socket. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The following is combined with Figure 1 -2 further details of this application,

[0032] The present application embodiment discloses a titanium removal process for sintered ore powder outside a blast furnace molten iron, which specifically comprises the following steps:

[0033] S1. Preparation of de-titanium agent: Collect the sintered ore powder from the sieve of the sintered ore, take samples of the sintered ore powder, and send it to the laboratory to re-test the FeO content m% value; ensure that it meets the use requirements; after confirming that the quality meets the requirements, put the sintered ore powder into the de-titanium automatic feeding device next to the blast furnace iron ditch for standby use; the particle size of the sintered ore powder is required to be controlled between 2mm and 5mm. When the sintered ore powder is used as a de-titanium agent, if the particle size is greater than 5mm, it will waste costs when used as a desulfurization agent. If the particle size is less than 2mm, there will be a lot of dust during the addition process and the FeO content is insufficient, and the de-titanium effect is poor.

[0034] The m% value is the content of FeO in the sintered ore powder. The FeO content m% value that meets the use requirements is 8% to 10%. When the FeO content in the sintered ore powder is greater than 10%, although the de-titanium effect is good, the sintering cost is high; when the FeO content in the sintered ore powder is less than 8%, the de-titanium effect is reduced, and the strength of the sintered ore is also reduced, which is not conducive to the smooth operation of the blast furnace.

[0035] S2. Estimation of titanium content in molten iron: The blast furnace foreman estimates the titanium content in molten iron during the tapping process and notifies the furnace front team of the estimated results;

[0036] S3. Addition of detitaniumizing agent: After the furnace-front team receives the estimated titanium content in the molten iron from the blast furnace foreman, when the titanium content in the blast furnace molten iron is between 0.06% and 0.085%, the furnace-front team will, based on the estimated titanium content, evenly add detitaniumizing agent, i.e., sintered ore return powder, into the molten iron ditch through the detitaniumizing automatic feeding device during the iron-discharging process; 9.8 kg of detitaniumizing agent is required to remove 0.01% of Ti per ton of molten iron.

[0037] S4, titanium removal reaction: FeO in the sintered ore powder and Ti in the molten iron use the potential energy of the height difference of the molten iron falling into the molten iron tank to fully mix and react, generating titanium oxide that precipitates from the molten iron, forming slag that is separated from the molten iron, thereby achieving titanium removal;

[0038] S5. Composition testing and adjustment: The molten iron is sent to the laboratory for composition testing. According to the composition of the molten iron shown in the test results, the foreman in front of the furnace will fine-tune the amount of detitanium agent added to ensure that the titanium content in the molten iron meets the standards for molten iron for cast pipes and the detitanium cost is optimal.

[0039] The deputy foreman of the blast furnace observes the iron-tapping process every day and visually observes the silicon and titanium content in the molten iron with an accuracy of 80%. The accuracy of visual observation of the silicon and titanium content in the molten iron can be improved, or an online monitor for the silicon content in the molten iron can be used to further improve the detection accuracy and process stability.

[0040] like Figure 1-2 As shown, the automatic titanium removal feeding device includes a bracket 1, a charging hopper 2, four electric rollers 3 arranged at the four corners of the bottom of the bracket 1, a weighing sensor 4 connecting the charging hopper 2 and the bracket 1, and a rail 5 that cooperates with the electric roller 3 to guide the rolling and drive the bracket 1 and the charging hopper 2 to move; the bracket 1 and the charging hopper 2 are sent to the iron water ditch through the cooperation of the electric roller 3 and the guide rail, and the titanium removal agent is added to the iron water ditch by opening the flow valve 7 on the feeding nozzle 6 on the charging hopper 2.

[0041] The bracket 1 is equipped with a weighing display 8, a distribution box 9 and an active power socket 10 electrically connected to the weighing sensor 4. Through the connection between the weighing sensor 4 and the weighing display 8, the remaining amount of the material in the container can be monitored in real time, and the feeding nozzle 6, the flow valve 7 and the external control device are used to automatically complete the feeding action, avoiding the instability and error of manual operation. The distribution box 9 and the active power socket 10 provide power support. Through such connection and working principle, the device can accurately weigh the weight of the titanium removal material and realize automatic control.

[0042] The completion status of the off-furnace titanium removal technology using sintered ore return powder as a titanium removal agent is shown in Table 1:

[0043] Table 1 Titanium removal work completion status

[0044]

[0045]

[0046] Table 1 shows the completion of titanium removal work from January 2024 to October 2024. Sintered ore powder is used as a titanium removal agent. The current minimum cost of removing 0.02% titanium from a ton of iron by off-furnace titanium removal technology is 10.76 yuan / t, which shows that the use of sintered ore powder as a titanium removal agent is economically effective. The cost of removing 0.02% of the molten iron for the casting pipe is 31.6 yuan / t, and the cost of titanium removal per ton of molten iron is directly reduced by 31.6-10.76=20.84 yuan / ton of molten iron; compared with the cost of using sintered ore powder, the use of sintered ore powder for titanium removal can directly reduce costs, reducing 20.84 yuan per ton of molten iron, effectively reducing the overall production cost. The use of titanium removal technology provides strong technical support for the company's thin-walled pipe production, increases the number of qualified molten iron, and ensures the on-time delivery of thin-walled pipes.

[0047] Table 1 intuitively shows the comparison of detitanium cost and efficiency. The above shows that the application of detitanium technology provides strong technical support for the company's thin-walled tube production, increases the amount of qualified molten iron, and ensures the on-time delivery of thin-walled tubes.

[0048] The titanium removal process of sintered ore powder outside the blast furnace molten iron uses sintered ore return powder as a titanium removal agent. Sintered ore return powder is the undersize of sintered ore, and its composition is relatively stable, which means that its titanium removal effect can be predicted when used, thereby reducing the problem of unstable titanium removal caused by composition fluctuations. As a by-product of the blast furnace, the supply of sintered ore return powder is sufficient and stable, which provides a guarantee for continuous production. The method of adding sintered ore return powder is relatively simple, and it can be evenly added through an automatic feeding device, which reduces the difficulty of operation and labor intensity. Since the method of adding sintered ore return powder is simple, the labor intensity of workers is reduced and production efficiency is improved. The cost of sintered ore return powder is lower than that of other titanium removal agents, such as nitrides and iron ore concentrate containing FeO, because the acquisition cost of sintered ore return powder as a by-product is relatively low.

[0049] As a by-product of the blast furnace, sintered ore return powder has a low value in itself, but its use as a de-titanium agent can increase its added value while reducing the demand for more expensive de-titanium agents. Sintered ore return powder does not require pretreatment such as drying like other de-titanium agents, which reduces energy consumption and processing costs. Since sintered ore return powder is easy to add, it reduces the complex steps in the operation process and reduces manpower and equipment costs. By using sintered ore return powder, the titanium content in molten iron can be more effectively controlled, reducing production problems caused by excessive titanium content, thereby reducing overall production costs. The advantages of sintered ore return powder as a de-titanium agent are its stability, simplicity and cost-effectiveness, which work together to reduce the cost of de-titaniumization.

[0050] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A process for removing titanium from sintered ore powder outside a blast furnace, characterized in that: The specific steps include: S1. Preparation of de-titanium agent: Collect the sintered ore powder from the sieve of the sintered ore, take samples of the sintered ore powder, and send it to the laboratory for re-testing of the FeO content m% value; ensure that it meets the use requirements; after confirming that the quality meets the requirements, put the sintered ore powder into the de-titanium automatic feeding device next to the blast furnace iron ditch for standby use; S2. Estimation of titanium content in molten iron: The blast furnace foreman estimates the titanium content in molten iron during the tapping process and notifies the furnace front team of the estimated results; S3. Addition of de-titanium agent: After the furnace front team receives the estimated titanium content in the molten iron from the blast furnace foreman, when the titanium content in the blast furnace molten iron is between 0.06% and 0.085%, the furnace front team, based on the estimated titanium content, evenly adds de-titanium agent, i.e., sintered ore powder, into the molten iron ditch through the de-titanium automatic feeding device during the iron tapping process; S4, titanium removal reaction: FeO in the sintered ore powder and Ti in the molten iron use the potential energy of the height difference of the molten iron falling into the molten iron tank to fully mix and react, generating titanium oxide that precipitates from the molten iron, forming slag that is separated from the molten iron, thereby achieving titanium removal; S5. Composition testing and adjustment: The molten iron is sent to the laboratory for composition testing. According to the composition of the molten iron shown in the test results, the foreman in front of the furnace will fine-tune the amount of detitanium agent added to ensure that the titanium content in the molten iron meets the standards for molten iron for cast pipes and the detitanium cost is optimal.

2. The titanium removal process of sintered ore powder outside blast furnace molten iron according to claim 1, characterized in that: In step S1, the particle size of the sintered ore powder is required to be controlled between 2 mm and 5 mm.

3. The titanium removal process of sintered ore powder outside blast furnace molten iron according to claim 1, characterized in that: In step S3, 9.8 kg of detitanium agent is required to be added to remove 0.01% of Ti per ton of molten iron.

4. The titanium removal process of sintered ore powder outside blast furnace molten iron according to claim 1, characterized in that: The m% value is the content of FeO in the sintered return ore powder. The FeO content m% value that meets the use requirements is 8% to 10%.

5. The titanium removal process of sintered ore powder outside blast furnace molten iron according to claim 1, characterized in that: The automatic titanium removal feeding device includes a bracket, a charging hopper, four electric rollers arranged at the four corners of the bottom of the bracket, a weighing sensor connecting the charging hopper and the bracket, and a steel rail that cooperates with the electric rollers to guide the rolling and drive the bracket and the charging hopper to move; the bracket and the charging hopper are sent to the iron water ditch through the cooperation of the electric rollers and the guide rails, and the titanium removal agent is added to the iron water ditch by opening the flow valve on the feeding nozzle of the charging hopper.

6. A titanium removal process for sintered ore powder outside blast furnace molten iron according to claim 5, characterized in that: A weighing display, a distribution box and an active power socket electrically connected to the weighing sensor are installed on the bracket.

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