Device and method for on-line enrichment of magnetite and metallic iron particles in melt

Abstract

The present invention introduces a device and method for on-line enrichment of magnetite and metallic iron particles in a melt. Among them, a device for on-line enrichment of magnetite and metallic iron particles in a melt includes a ladle and an electromagnet unit; the electromagnet unit is evenly surrounded on the outer wall of the ladle; in this application, the enrichment of magnetite and metallic iron particles in the melt is realized by the adsorption of the electromagnet, and combined with the multiple pouring of secondary slag, the technical effect that all the secondary slag poured into the slag pot does not need to be crushed and magnetic separated is realized. Only the magnetite, metallic iron particles and residual secondary slag after the last pouring need to be cooled to room temperature and then crushed and magnetic separated, greatly reducing the workload of the crushing and magnetic separation processes, and finally realizing the high-efficiency and low-energy consumption enrichment of magnetite and metallic iron particles, and ultimately realizing the efficient recovery of iron elements.

Description

Technical Field

[0001] The present invention relates to the field of metallurgy, and particularly to an apparatus and method for on-line enrichment of magnetite and metallic iron particles in a melt. Background Art

[0002] The quality characteristics of "poor, fine, miscellaneous, and scattered" of iron ore in China make it difficult to meet the development of the steel industry. Since the imported iron ore volume exceeded 1 billion tons in 2016, it has remained high, and the external dependence also remains at about 80%. Therefore, domestic metallurgists have focused on seeking alternative resources for iron ore. In order to realize the recycling of iron components in iron-rich metallurgical slags such as copper slag, nickel slag, and steel slag, the existing main idea is to first reduce / oxidize the iron-containing phase in the slag to iron particles / magnetite particles, then cool it to room temperature, and finally obtain iron powder or magnetite after crushing and magnetic separation.

[0003] Chinese patents CN101713008A, CN103343228A, and CN106636498A respectively disclose a method for reducing molten nickel slag, copper slag, and steel slag. After the reduced slag is cooled, iron powder can be obtained through crushing and magnetic separation. Chinese patents CN104988302A, CN110453064A, and CN103849695A respectively disclose a method for oxidizing, cooling molten nickel slag, copper slag, and steel slag, and obtaining magnetite through crushing and magnetic separation. Among the above patents, except that Chinese patents CN101713008A and CN103343228A mention that the apparatuses used are electric furnaces and slag ladles, other patents do not involve apparatuses. Most importantly, the above methods and patents only deal with single-batch slags, and do not consider the connection and continuity between the treatments of each batch of slags from the perspective of process design. Therefore, after each batch of slag treatment is completed, it needs to be cooled to room temperature, and then the iron components are recovered through crushing - magnetic separation.

[0004] The technical solutions provided by the above patents all have the technical problems of low recycling efficiency, long cycle, large crushing volume and magnetic separation volume, and high energy consumption of magnetite and metallic iron particles. Because magnetite, metallic iron, and secondary slag in each batch of slag need to be cooled to room temperature separately first, and then crushed and magnetically separated. After separating the secondary slag, magnetite / iron powder is obtained; magnetite and metallic iron in each batch are not related to each other. Especially when the magnetite and metallic iron obtained by magnetic separation are reused in steel smelting, magnetite and metallic iron need to consume energy for secondary heating, further highlighting the disadvantages of low reuse efficiency of magnetite and metallic iron and poor process connection; in addition, magnetite, metallic iron, and secondary slag cooled to room temperature all enter the crushing-magnetic separation process. The huge material crushing volume and magnetic separation volume not only increase the process load and energy consumption, but also reduce the magnetic separation efficiency. Therefore, it is particularly important to design a device and method for enriching iron components in molten slag to achieve high-efficiency and low-energy consumption enrichment of magnetite and metallic iron particles and facilitate subsequent reuse. Summary of the Invention

[0005] To solve the above problems and achieve high-efficiency and low-energy consumption enrichment of magnetite and metallic iron particles, and further achieve efficient recovery of iron elements and low-energy consumption smelting.

[0006] To achieve the above effects, the present invention designs a device and method for on-line enrichment of magnetite and metallic iron particles in a melt.

[0007] A device for enriching magnetite and metallic iron particles in a melt, which includes a ladle and an electromagnet unit;

[0008] The electromagnet unit is evenly surrounded on the outer wall of the ladle;

[0009] A small hook of the ladle body is provided at the bottom of the ladle;

[0010] Trunnions are correspondingly provided on both sides of the outer wall of the upper part of the ladle.

[0011] Preferably, the electromagnet unit includes a first electromagnet unit and other electromagnet units;

[0012] The bottoms of the first electromagnet unit and other electromagnet units are flush with the inner bottom of the ladle;

[0013] The number of other electromagnet units is multiple;

[0014] The first electromagnet unit and other electromagnet units are evenly surrounded on the outer wall of the ladle;

[0015] The first electromagnet unit is located directly below the ladle mouth;

[0016] The axis of the first electromagnet unit is perpendicular to the axis of the trunnion;

[0017] The axis of the first electromagnet unit is coplanar with that of the small hook of the ladle body.

[0018] Preferably, the number of the other electromagnet units is two, specifically including a second electromagnet unit and a third electromagnet unit;

[0019] The second electromagnet unit and the third electromagnet unit are symmetric about the small hook of the ladle body;

[0020] The included angle θ between the axes of the electromagnet units is 120°;

[0021] The radian of the electromagnet unit is π / 3;

[0022] The height of the electromagnet unit does not exceed 1 / 2 of the height of the steel ladle body.

[0023] Preferably, the electromagnet unit is fixed on the wall of the steel ladle by direct welding or mechanical external hanging.

[0024] Preferably, the current used by the electromagnet unit is direct current, the current increases with the increase of the ladle capacity, and the duty cycle TD of the electromagnet unit is <20%.

[0025] A method for using an on-line enrichment device for magnetite and metallic iron particles in a melt includes the following steps:

[0026] Step S1: Fill the steel ladle with slag within a specific time and perform oxidation or reduction treatment;

[0027] Step S2: After the oxidation or reduction treatment is completed, energize the electromagnet unit and let the steel ladle stand for a certain time;

[0028] Step S3: After standing, first use the main hook of the overhead crane to lift the trunnion, and then smoothly lift the steel ladle to the slag pot; then use the auxiliary hook of the overhead crane to lift the small hook of the ladle body at a specific speed and gradually pour the secondary slag in the steel ladle into the slag pot;

[0029] Step S4: When the steel ladle is tilted to a certain angle, gradually release the auxiliary hook of the overhead crane at a specified speed, right the steel ladle and make it reset;

[0030] Step S5: Disconnect the current of the electromagnet unit;

[0031] Step S6: Refill the steel ladle with slag;

[0032] Step S7: Repeat the above steps until the amount of secondary slag poured out of the steel ladle is less than 1 / 3 of the ladle capacity.

[0033] Preferably, in step S2, the standing time of the steel ladle is 10 - 20 minutes.

[0034] Preferably, in step S3, if a single slag ladle is used to receive the secondary slag, the capacity of the slag ladle should be at least 80% of the capacity of the ladle. If two slag ladles are used to receive the secondary slag, the capacity of each slag ladle should be at least 50% of the capacity of the ladle.

[0035] Preferably, in step S3, during the pouring process of the secondary slag, the average speed of the auxiliary hook of the crane to lift the small hook of the ladle body is 20°±5° per minute, and the lifting speed decreases with the increase of the ladle capacity. The minimum inclination angle of the ladle during the pouring process is 10°, and the inclination angle increases by 10°±2° for each additional pouring.

[0036] Preferably, in step S4, if there is still a small amount of secondary slag remaining in the ladle after the inclination angle of the ladle reaches the predetermined angle, this part of the secondary slag will directly enter the next cycle together with the magnetite and metallic iron particles.

[0037] The advantages and effects of this application are as follows:

[0038] 1. In this application, the magnetite and metallic iron particles in the molten slag are adsorbed on the inner wall of the ladle by the magnetic force of the electromagnet, and combined with the operation of pouring the secondary slag, the on-line enrichment of magnetite and metallic iron particles in each batch of molten slag is realized. The enriched magnetite and metallic iron can directly enter the steel smelting process, not only making full use of the high-temperature sensible heat they carry, but also saving the energy consumption of the cooling, crushing - magnetic separation process and its reheating. Therefore, the enrichment and recovery efficiency of iron components can be improved, the operation cycle can be shortened, and the energy consumption can be significantly reduced.

[0039] 2. This application improves the enrichment degree of magnetite and metallic iron particles in the molten slag, making them separated from the secondary slag to the greatest extent. When conventional cold-state material crushing - magnetic separation is required, it is beneficial to improve the dissociation degree of magnetite and metallic iron particles and reduce the amount of gangue entrained in the magnetite and metallic iron particles. Therefore, the total iron grade of the obtained magnetite and metallic iron can be improved.

[0040] 3. This application can realize the on-line enrichment of magnetite and metallic iron particles in the melt by magnetic force, and combined with multiple pourings of the secondary slag. When conventional cold-state material crushing - magnetic separation is required, all the secondary slag poured into the slag ladle does not need to be crushed and magnetically separated. Only the residual secondary slag after the last pouring of the ladle and the enriched magnetite and metallic iron particles enter the crushing - magnetic separation process, greatly reducing the workload and operation time of the crushing - magnetic separation process, improving the operation efficiency of the crushing - magnetic separation process, and significantly reducing the energy consumption.

[0041] The above description is only an overview of the technical solution of this application. In order to understand the technical means of this application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of this application more obvious and understandable, the following takes the preferred embodiments of this application and combines with the drawings to elaborate in detail as follows.

[0042] Those skilled in the art will better understand the above and other objects, advantages and features of the present application from the following detailed description of specific embodiments of the present application in conjunction with the accompanying drawings. Description of the Drawings

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings. In all the drawings, similar elements or parts are generally denoted by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to actual scale.

[0044] Figure 1 Three-view drawings of the structure of the device of the present invention;

[0045] Figure 2 Process flow chart of the method of the present invention;

[0046] Figure 3 Process text flow chart of the method of the present invention;

[0047] Reference numerals: 1, ladle; 2, first electromagnet unit; 3, trunnion; 4, small hook of the ladle body; 5, second electromagnet unit; 6, third electromagnet unit; 11, slag; 12, magnetite and metallic iron particles; 13, secondary slag; 14, slag pot. Detailed Embodiments

[0048] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present application in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. In the following description, specific details such as specific configurations and components are provided only to assist in a comprehensive understanding of the embodiments of the present application. Therefore, those skilled in the art should clearly understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Additionally, descriptions of known functions and structures are omitted for clarity and conciseness.

[0049] It should be understood that the "one embodiment" or "the present embodiment" mentioned throughout the specification means that a specific feature, structure or characteristic related to the embodiment is included in at least one embodiment of the present application. Therefore, the "one embodiment" or "the present embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.

[0050] In addition, this application may repeat reference numerals and / or letters in different instances. This repetition is for the purpose of simplicity and clarity, and in itself does not indicate the relationship between the various embodiments and / or arrangements discussed.

[0051] The term "and / or" in this text is merely a description of the associated relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, B exists alone, and A and B exist simultaneously. The term " / and" in this text is a description of another associated object relationship, indicating that there can be two relationships. For example, A / and B can represent: A exists alone, and A and B exist alone. In addition, the character " / " in this text generally indicates that the associated objects before and after are in an "or" relationship.

[0052] The term "at least one" in this text is merely a description of the associated relationship of the associated objects, indicating that there can be three relationships. For example, at least one of A and B can represent: A exists alone, A and B exist simultaneously, and B exists alone.

[0053] It should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion.

[0054] Embodiment 1

[0055] This embodiment mainly introduces the basic design and usage method of an on-line enrichment device for magnetite and metallic iron particles in a melt.

[0056] An enrichment device for magnetite and metallic iron particles in a melt, which includes a ladle 1 and an electromagnet unit;

[0057] The electromagnet unit is evenly surrounded on the outer wall of the ladle 1;

[0058] A ladle hook 4 is provided at the bottom of the ladle 1;

[0059] Trunnions 3 are correspondingly provided on both sides of the upper outer wall of the ladle 1.

[0060] Furthermore, the electromagnet unit is fixed on the ladle wall of the ladle 1 by direct welding or mechanical external hanging.

[0061] Furthermore, the current used by the electromagnet unit is direct current, the current increases with the increase of the capacity of the ladle 1, and the duty cycle TD of the electromagnet unit < 20%.

[0062] A method for using an on-line enrichment device for magnetite and metallic iron particles in a melt, comprising the following steps:

[0063] Step S1: Pour molten slag 11 into ladle 1 within a specific time, and perform oxidation or reduction treatment;

[0064] Step S2: After the oxidation or reduction treatment is completed, energize the electromagnet unit and let ladle 1 stand still for a certain time;

[0065] Step S3: After standing still, first use the main hook of the overhead crane to lift trunnion 3, and then smoothly hoist ladle 1 to the slag pot 14; then use the auxiliary hook of the overhead crane to lift the small hook 4 of the ladle body at a specific speed, and gradually pour the secondary slag 13 in ladle 1 into slag pot 14;

[0066] Step S4: When ladle 1 is tilted to a certain angle, gradually release the auxiliary hook of the overhead crane at a specified speed, right ladle 1 and make it reset;

[0067] Step S5: Cut off the current of the electromagnet unit;

[0068] Step S6: Pour molten slag 11 into ladle 1 again;

[0069] Step S7: Repeat the above steps until the amount of secondary slag 13 poured out of ladle 1 is less than 1 / 3 of the capacity of ladle 1.

[0070] Further, in step S2, the standing time of ladle 1 is 10 - 20 minutes.

[0071] Further, in step S3, if a single slag pot 14 is used to receive secondary slag 13, the capacity of slag pot 14 is at least 80% of the capacity of ladle 1; if two slag pots 14 are used to receive secondary slag 13, the capacity of slag pot 14 is at least 50% of the capacity of ladle 1.

[0072] Further, in step S3, during the pouring process of secondary slag 13, the average speed of the auxiliary hook of the overhead crane to lift the small hook 4 of the ladle body is 20° ± 5° per minute, and the lifting speed decreases as the capacity of ladle 1 increases; the minimum inclination angle of ladle 1 during the pouring process is 10°, and the inclination angle increases by 10° ± 2° for each additional pouring.

[0073] Further, in step S4, if there is still a small amount of secondary slag 13 in ladle 1 that has not been poured out after the inclination angle of ladle 1 reaches the predetermined angle, this part of secondary slag 13 directly enters the next cycle together with magnetite and metallic iron particles 12.

[0074] In this application, magnetite and metallic iron particles in the molten slag are adsorbed on the inner wall of the ladle online by magnetic force, and combined with the operation of pouring secondary slag, the magnetite and metallic iron particles enriched online can directly enter the iron and steel smelting process, thus realizing the maximum degree and highest efficiency of enrichment and reuse of magnetite and metallic iron particles in different batches of molten slag.

[0075] Example 2

[0076] Based on the above Example 1, this example mainly introduces the optimal design of an online enrichment device for magnetite and metallic iron particles in the melt.

[0077] For a device for online enriching magnetite and metallic iron particles in the melt, please refer to Figure 1 , the Figure 1 Three-view drawings of the structure of a device for enriching magnetite and metallic iron particles in the melt;

[0078] Among them, a device for enriching magnetite and metallic iron particles in the melt includes a ladle 1 and an electromagnet unit;

[0079] The electromagnet unit is evenly surrounded on the outer wall of the ladle 1;

[0080] A small hook 4 of the ladle body is provided at the bottom of the ladle 1;

[0081] Trunnions 3 are correspondingly provided on both sides of the outer wall of the upper part of the ladle 1.

[0082] Furthermore, the electromagnet unit is fixed on the ladle wall of the ladle 1 by direct welding or mechanical external hanging.

[0083] Furthermore, the electromagnet unit includes a first electromagnet unit 2 and other electromagnet units;

[0084] The bottoms of the first electromagnet unit 2 and other electromagnet units are flush with the inner bottom of the ladle 1;

[0085] The number of other electromagnet units is multiple;

[0086] The first electromagnet unit 2 and other electromagnet units are evenly surrounded on the outer wall of the ladle 1;

[0087] The first electromagnet unit 2 is located directly below the ladle opening of the ladle 1;

[0088] The axis of the first electromagnet unit 2 is perpendicular to the axis of the trunnion 3;

[0089] The axis of the first electromagnet unit 2 and the axis of the small hook 4 of the ladle body are coplanar.

[0090] Furthermore, the axis angle θ between the multiple electromagnet units is 120°; the radian of the electromagnet units is π / 3; the height of the electromagnet units does not exceed 1 / 2 of the height of the ladle 1; the three electromagnet units of equal height can be directly welded and fixed on the outer wall of the ladle, or can be mechanically attached to the ladle wall; the current used by the electromagnet units is direct current with a voltage of 220V, the current increases with the increase of the ladle capacity, and the power-on duration TD is <20%.

[0091] Based on the fact that the enriched magnetite and metallic iron particles of the present application are more likely to aggregate, cold crushing at room temperature is also more likely to increase the dissociation degree of magnetite and metallic iron, effectively reducing the amount of entrained gangue and increasing the total iron grade of magnetite and metallic iron.

[0092] Example 3

[0093] Based on the above examples 1-2, this example mainly introduces a method for optimizing the use of a device for enriching magnetite and metallic iron particles in a melt. For specific steps, please refer to Figure 2 Graphical flowcharts and Figure 3 Text flow chart.

[0094] A method for online enrichment of magnetite and metallic iron particles in a melt, comprising the following steps:

[0095] The molten slag 11 is poured into the ladle 1 at a uniform speed within 3 to 5 minutes, and the liquid level does not exceed the slag line of the ladle 1;

[0096] Supplying power to the electromagnet unit 2 generates magnetic force;

[0097] Ladle 1 is left to stand for 10 to 20 minutes;

[0098] The magnetite and metallic iron particles 12 in the ladle 1 are tightly adsorbed on the lower portion of the inner wall of the ladle 1;

[0099] Stable lifting of the ladle 1 means that during the transportation process, the melt in the ladle 1 is allowed to have a small fluctuation near the slag line, but the liquid level must not fluctuate back and forth, and the melt is absolutely not allowed to overflow the ladle 1;

[0100] The slag pot 14 for holding the secondary slag 13 can be placed on a slag car or directly transported to a designated location by an overhead crane;

[0101] The designated position refers to a position where the secondary slag 13 can be poured out and directly fall into the center of the bottom of the slag pot 14;

[0102] If a single slag pot 14 is used to receive the secondary slag 13, its capacity should be at least 80% of the capacity of the ladle 1. If a small amount of secondary slag 13 remains in the ladle after the ladle 1 has reached the predetermined inclination angle, this portion of the secondary slag 13 will directly enter the next cycle along with the magnetite and metallic iron particles 12.

[0103] If two slag ladles 14 are used to receive the secondary slag 13, their capacity should be at least 50% of the capacity of the ladle 1, and the two slag ladles 14 must be placed closely, for example, on the same slag truck. When the first slag ladle 14 is about to be filled with the secondary slag 13, lower the auxiliary hook of the overhead crane that hooks the small hook 4 of the ladle body to increase the inclination angle of the ladle 1 by 5°±1° to prevent the secondary slag 13 from flowing out. The second slag ladle 14 must be moved to the designated position, that is, the original position of the first slag ladle 14, within 20 seconds±5 seconds after the secondary slag 13 in the ladle 1 stops flowing out.

[0104] During the pouring process of the secondary slag 13, the average speed of the auxiliary hook of the overhead crane to lift the small hook of the ladle body is 20°±5° per minute, and the lifting speed decreases with the increase of the capacity of the ladle 1.

[0105] The minimum inclination angle of the ladle 1 during the pouring process is 10°, and the inclination angle increases by 10°±2° for each additional pouring time.

[0106] After the secondary slag 13 is poured out, slowly release the auxiliary hook of the overhead crane at a uniform speed to make the ladle 1 return to the upright position within 30 seconds and finally reset.

[0107] Repeat the above steps until the amount of secondary slag poured out of the ladle 1 is less than 1 / 3 of the capacity of the ladle 1.

[0108] The amount of secondary slag poured out can be calculated by weighing the ladle 1 with the overhead crane: the amount of secondary slag poured out = the weight of the ladle 1 before pouring - the weight of the ladle 1 after returning to the upright position.

[0109] In this application, an electromagnet is used to realize the online enrichment of magnetite and metallic iron particles in the melt, so that they are separated from the secondary slag. Combined with multiple pourings of the secondary slag, all the secondary slag poured into the slag ladle does not need to be crushed and magnetic separated. Only the magnetite, metallic iron particles and residual secondary slag after the last pouring need to be cooled to room temperature and then crushed and magnetic separated. The secondary slag poured into the slag ladle does not need to enter the crushing-magnetic separation process, which greatly reduces the workload of the crushing and magnetic separation processes, significantly reduces the amount of crushing and magnetic separation, further reduces the energy consumption, improves the efficiency of the crushing-magnetic separation process, and shortens the operation time.

[0110] The above are only the preferred embodiments of the present invention, and they do not limit the protection scope of the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any changes, modifications, substitutions, integrations and parameter changes made to these embodiments by means of conventional substitutions or capable of realizing the same functions without departing from the principle and spirit of the present invention fall within the protection scope of the present invention.

Claims

1. A method for using an on-line enrichment device for magnetite and metallic iron particles in a melt, characterized in that, The device includes a ladle and an electromagnet unit; A small hook of the ladle body is provided at the bottom of the ladle; Trunnions are correspondingly provided on both sides of the outer wall of the upper part of the ladle; The electromagnet unit includes a first electromagnet unit and other electromagnet units; The bottoms of the first electromagnet unit and other electromagnet units are flush with the inner bottom of the ladle; The number of other electromagnet units is multiple; The first electromagnet unit and other electromagnet units are evenly arranged around the outer wall of the ladle; The usage method includes the following steps: Step S1: Pour the molten slag into the ladle evenly within 3 - 5 minutes for oxidation or reduction treatment; Step S2: After the oxidation or reduction treatment is completed, energize the electromagnet unit and let the ladle stand for a certain period of time; Step S3: After standing, first use the main hook of the overhead crane to lift the trunnion, and then hoist the ladle smoothly to the slag pot; then use the auxiliary hook of the overhead crane to lift the small hook of the ladle body. The average lifting speed of the auxiliary hook of the overhead crane for lifting the small hook of the ladle body is 20° ± 5° per minute, and the lifting speed decreases with the increase of the ladle capacity, and gradually pour the secondary slag in the ladle into the slag pot; Step S4: After the ladle is tilted to a certain angle, gradually release the auxiliary hook of the overhead crane at a specified speed, return the ladle to its original position and reset it; Step S5: Cut off the current of the electromagnet unit; Step S6: Pour molten slag into the ladle again; Step S7: Repeat the above steps until the amount of secondary slag poured out of the ladle is less than 1 / 3 of the ladle capacity; In Step S3, if a single slag pot is used to receive the secondary slag, the capacity of the slag pot is at least 80% of the ladle capacity. If two slag pots are used to receive the secondary slag, the capacity of the slag pot is at least 50% of the ladle capacity; In Step S3, the minimum inclination angle of the ladle during the pouring process of the secondary slag is 10°, and the inclination angle increases by 10° ± 2° for each additional pouring time; In Step S4, if there is still a small amount of secondary slag left in the ladle after the ladle reaches the predetermined angle, this small amount of secondary slag directly enters the next cycle along with magnetite and metallic iron particles.

2. The method of using an on-line enrichment device for magnetite and metallic iron particles in a melt according to claim 1, characterized in that, The first electromagnet unit is located directly below the ladle mouth; The axis of the first electromagnet unit is perpendicular to the axis of the trunnion; The axis of the first electromagnet unit and the axis of the small hook of the ladle body are coplanar.

3. The method of using an on-line enrichment device for magnetite and metallic iron particles in a melt according to claim 2, characterized in that, The number of other electromagnet units is two, specifically including a second electromagnet unit and a third electromagnet unit; The second electromagnet unit and the third electromagnet unit are symmetric about the small hook of the ladle body.

4. A method for using an on-line enrichment device for magnetite and metallic iron particles in a melt according to any one of claims 1 or 2, characterized in that, The electromagnet unit is fixed on the ladle wall by direct welding or mechanical external hanging; The included angle θ between the axes of the electromagnet units is 120°; The radian of the electromagnet unit is π / 3; The height of the electromagnet unit does not exceed 1 / 2 of the height of the ladle body.

5. A method for using an on-line enrichment device for magnetite and metallic iron particles in a melt according to any one of claims 1 or 2, characterized in that, The current used by the electromagnet unit is direct current, and the current increases with the increase of the ladle capacity. The duty cycle TD of the electromagnet unit is < 20%.

6. The method of using a device for on-line enrichment of magnetite and metallic iron particles in a melt according to claim 1, characterized in that In Step S2, the standing time of the ladle is 10 - 20 minutes.

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