Steel slag treatment equipment and steel slag treatment method

Abstract

The invention relates to steel slag treatment equipment and a steel slag treatment method. The steel slag treatment equipment comprises a machine table, a powder spraying tank, a connecting pipe, a rotary spraying gun, a rotary control device, a steel ladle and an induction coil. The powder spraying tank is arranged on the machine table. The steel ladle is provided with a cavity used for containing steel slag. And the induction coil is wound on the outer wall of the steel ladle. The rotary spray gun is arranged on the machine table. The rotary spray gun can rotate around the axis thereof. And the discharge end of the rotary spray gun is arranged in the cavity. The discharging end of the powder spraying tank is connected to the feeding end of the rotary spraying gun through a connecting pipe and used for spraying reducing agent powder into the cavity. The rotary control device is arranged on the machine table and connected to the rotary spray gun so as to control rotation of the rotary spray gun. The steel slag treatment equipment can be used for recycling the steel slag, and the recovery rate of molten metal in the steel slag and the recycling rate of the steel slag can be increased.

Description

Technical Field

[0001] The present application relates to the technical field of steel slag recycling, and in particular to a steel slag processing device and a steel slag processing method. Background Art

[0002] Converter slag is difficult to be directly recycled because it contains P2O5, which is harmful to the performance of steel. Part of the CaO and MgO contained in the slag is combined with other components in a chemical state, and part of it exists in a free state. Exposure to the air will cause volume expansion. Therefore, the slag must be processed before it can be used in building materials, and the amount used is limited. In view of the characteristics of slag, the existing technologies for recycling slag mainly include hot stewing, hot pouring, and drums. After the slag is crushed and magnetically separated, the iron-rich part is returned to steelmaking, the tailings part is returned to sintering, and the remaining part is used in cement, roadbed or piled up and landfilled. The slag contains a large amount of metal Fe and FeO, CaO, MgO, Al2O3, etc. However, the traditional slag treatment method has a low recovery rate of the metal steel liquid in the slag, and a low recycling rate of the slag. Summary of the invention

[0003] Based on this, it is necessary to provide a steel slag treatment device and a steel slag treatment method. The steel slag treatment device of the present application can be used to recycle steel slag, and can improve the recovery rate of molten metal in the steel slag and the recycling rate of the steel slag.

[0004] In a first aspect, the present application provides a slag processing device, including a machine platform, a powder spraying tank, a connecting pipe, a rotary spray gun, a rotary control device, a ladle, and an induction coil;

[0005] The powder spray can is arranged on the machine platform, and the powder spray can is used for spraying reducing agent powder;

[0006] The ladle has a cavity for holding steel slag; the induction coil is wound on the outer wall of the ladle, and the induction coil is used to heat the steel slag in the cavity;

[0007] The rotary spray gun is arranged on the machine platform; the rotary spray gun can rotate around its axis; the discharge end of the rotary spray gun is arranged in the cavity; the discharge end of the powder spray tank is connected to the feed end of the rotary spray gun through the connecting pipe, which is used to spray the reducing agent powder into the cavity; the rotation control device is arranged on the machine platform, and the rotation control device is connected to the rotary spray gun to control the rotation of the rotary spray gun.

[0008] In some embodiments, the rotary spray gun includes a powder spraying pipe, a support pipe and an insulation pipe which are nested in sequence from the inside to the outside; the discharge end of the powder spraying tank is connected to the feed end of the powder spraying pipe through the connecting pipe; the rotation control device is connected to the support pipe; the rotary spray gun also includes a paddle, which is arranged on the periphery of the insulation pipe and close to one side of the bottom of the ladle.

[0009] In some embodiments, the slag processing equipment also includes a lifting control device, which is disposed on the machine platform; the lifting control device is connected to the rotary spray gun, and the lifting control device is used to control the setting height of the rotary spray gun in the cavity.

[0010] In some of the embodiments, the ladle has a steel outlet, and the steel outlet is arranged at the bottom of the ladle; the ladle also includes a sealing device, and the sealing device is used to close the steel outlet.

[0011] In some embodiments, the slag processing equipment also includes a commutator; the commutator is movably disposed on the discharge side of the steel outlet to receive the material discharged from the steel outlet; the commutator includes a first material transport channel and a second material transport channel with different material transport directions.

[0012] In some embodiments, the slag processing equipment further includes a molten steel collecting device; the molten steel collecting device is disposed on the discharge side of the first material transport channel, and the molten steel collecting device is used to collect the molten steel discharged from the first material transport channel.

[0013] In some embodiments, the slag processing equipment further includes a slide, a blowing device, and a slag collection chamber;

[0014] The slideway is arranged at the discharge side of the second material transport channel, and is used to receive the steel slag discharged from the second material transport channel;

[0015] The air outlet of the blowing device is arranged toward the discharge side of the slideway, and is used for air quenching the steel slag discharged through the slideway;

[0016] The slag collecting chamber is used to receive the steel slag that has been quenched by the blowing device.

[0017] In a second aspect, the present application provides a steel slag treatment method, using any of the steel slag treatment equipment described above to treat steel slag, comprising the following steps:

[0018] Adding the hot steel slag to be treated into the cavity of the ladle and making the steel slag cover the discharge end of the rotary spray gun;

[0019] The steel slag in the cavity is heated by the induction coil to melt the solid metal in the hot steel slag;

[0020] The reducing agent powder is sprayed out at the discharge end of the rotary spray gun through the powder spray tank, and the rotary spray gun is controlled to rotate through the rotation control device. The reducing agent powder and the hot steel slag are mixed through the rotation of the rotary spray gun to perform reduction treatment on the hot steel slag.

[0021] In some embodiments, the power of the induction coil is 500 kwh / t~1000 kwh / t.

[0022] In some embodiments, the heating treatment time is 10 min to 30 min.

[0023] In some embodiments, the reducing agent powder is introduced into the cavity by a carrier gas, and the flow rate of the carrier gas is 40 Nm 3 / h~100Nm 3 / h.

[0024] In some embodiments, the powder spraying pressure of the powder spraying can is 0.4 MPa to 0.8 MPa.

[0025] In some embodiments, the ladle has a steel outlet, and the steel outlet is arranged at the bottom of the ladle; the ladle also includes a sealing device, and the sealing device is used to close the steel outlet; the slag processing equipment also includes a commutator; the commutator is movably arranged on the discharge side of the steel outlet, and is used to receive the material discharged from the steel outlet; the commutator includes a first material transport channel and a second material transport channel with different material transport directions;

[0026] After the hot slag is reduced, the following steps are also included:

[0027] Opening the sealing device to allow the molten steel obtained by reduction to flow out of the ladle;

[0028] The molten steel is transported through the first material transport channel.

[0029] In some embodiments, the slag processing equipment further includes a chute, a blowing device and a slag collecting chamber; the chute is arranged at the discharge side of the second material transport channel, and is used to receive the slag discharged from the second material transport channel; the air outlet of the blowing device is arranged toward the discharge side of the chute, and is used to quench the slag discharged through the chute; the slag collecting chamber is used to receive the slag quenched by the blowing device;

[0030] After the molten steel is transported through the first material transport channel, the following steps are further included:

[0031] When slag is discharged from the steel outlet, the diverter is moved to transfer the slag through the second material transport channel;

[0032] The chute receives the steel slag discharged by the second material transport;

[0033] The steel slag discharged from the discharge side of the slideway is subjected to air quenching by the air blowing device;

[0034] The slag that has been quenched by wind is collected by the slag collecting chamber.

[0035] The above-mentioned slag treatment equipment can be used to recycle and process slag. When in use, the hot slag to be treated can be added into the cavity of the ladle, and the slag can bury the discharge end of the rotary spray gun. After the slag is added, the slag in the cavity is heated by the induction coil. If the slag contains unmelted solid metal, it will heat up and melt under the action of electromagnetic induction; if there is no unmelted solid metal in the slag, the whole iron in the slag will also slowly heat up under the action of electromagnetic induction, thereby enhancing the fluidity of the slag to increase the mixing effect between the reducing agent powder and the slag. The reducing agent powder is then sprayed through the rotary spray gun, so that the reducing agent powder is sprayed into the slag through the discharge end of the rotary spray gun. At the same time, the rotating spray gun can mix the reducing agent powder and the slag, so that the slag generates molten metal under the action of the reduction reaction. Under the combined action of spraying and stirring, the molten metal steel contained in the slag and the molten steel generated by the reaction will converge, and due to the gravity difference between the molten steel and the slag, the molten metal steel will sink to the bottom of the cavity, achieving a better separation effect between the molten metal steel and the slag. At the same time, during the reduction reaction, the CO gas generated by the reaction will continue to be stirred and mixed with the slag during the rising process, and continue to react with the slag on the upper layer, increasing the effective utilization rate. The slag treatment equipment of the present application can make good use of the physical heat of the hot slag in use, and achieve a good mixing and reduction effect through spraying and rotary stirring, so that the FeO in the slag can be reduced in large quantities, and P2O5 can be reduced to the molten steel liquid, which has a good purification effect on the slag. The slag treatment equipment of the present application can be used for the recycling of slag, which can improve the recovery rate of the molten metal steel in the slag and the recycling rate of the slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the structure of a slag treatment device provided in one embodiment of the present application;

[0037] Figure 2 A schematic diagram of the partial structure of a rotary spray gun provided in one embodiment of the present application.

[0038] Description of Reference Numerals

[0039] 1. Lifting control device; 2. Rotation control device; 3. Powder spray tank; 4. Rotating spray gun; 41. Paddle; 42. Powder spray tube; 43. Support tube; 44. Insulation tube; 5. Ladle; 6. Induction coil; 7. Steel slag; 8. Molten steel; 9. Steel outlet; 10. Sealing device; 11. Commutator; 12. Dust removal device; 13. Molten steel collecting device; 14. Slide; 15. Blowing device; 16. Wind-quenched steel slag; 17. Slag collecting chamber; 18. Machine. DETAILED DESCRIPTION

[0040] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0044] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0045] Reference Figure 1 , Figure 2 As shown, an embodiment of the present application provides a slag processing device, including a machine 18, a powder spray tank 3, a connecting pipe, a rotary spray gun 4, a rotating control device 2, a ladle 5 and an induction coil 6. The powder spray tank 3 is arranged on the machine 18, and the powder spray tank 3 is used to spray reducing agent powder. The ladle 5 has a cavity for holding the slag. The induction coil 6 is wound on the outer wall of the ladle 5, and the induction coil 6 is used to heat the slag in the cavity. The rotary spray gun 4 is arranged on the machine 18. The rotary spray gun 4 can rotate around its axis. The discharge end of the rotary spray gun 4 is arranged in the cavity. The discharge end of the powder spray tank 3 is connected to the feed end of the rotary spray gun 4 through a connecting pipe, and is used to spray reducing agent powder into the cavity. The rotating control device 2 is arranged on the machine 18, and the rotating control device 2 is connected to the rotary spray gun 4 to control the rotation of the rotary spray gun 4.

[0046] The above-mentioned slag treatment equipment can be used to recycle slag. When in use, the hot slag to be treated can be added into the cavity of the ladle 5, and the slag can bury the discharge end of the rotary spray gun 4. After the slag is added, the slag in the cavity is heated by the induction coil 6. If the slag contains unmelted solid metal, it will heat up and melt under the action of electromagnetic induction. If there is no unmelted solid metal in the slag, the whole iron in the slag will also slowly heat up under the action of electromagnetic induction, thereby enhancing the fluidity of the slag to increase the mixing effect between the reducing agent powder and the slag. The reducing agent powder is then sprayed through the rotary spray gun 4, so that the reducing agent powder is sprayed into the slag through the discharge end of the rotary spray gun 4. At the same time, the rotating spray gun 4 can be rotated to mix the reducing agent powder and the slag, so that the slag generates molten metal under the action of the reduction reaction. Under the combined action of spraying and stirring, the molten metal steel contained in the slag and the molten steel generated by the reaction will converge, and due to the gravity difference between the molten steel and the slag, the molten metal steel will sink to the bottom of the cavity, achieving a better separation effect between the molten metal steel and the slag. At the same time, during the reduction reaction, the CO gas generated by the reaction will continue to be stirred and mixed with the slag during the rising process, and continue to react with the slag on the upper layer, increasing the effective utilization rate. The slag treatment equipment of the present application can make good use of the physical heat of the hot slag in use, and achieve a good mixing and reduction effect through spraying and rotary stirring, so that the FeO in the slag can be reduced in large quantities, and P2O5 can be reduced to the molten steel liquid, which has a good purification effect on the slag. The slag treatment equipment of the present application can be used for the recycling of slag, which can improve the recovery rate of the molten metal steel in the slag and the recycling rate of the slag.

[0047] It can be understood that hot steel slag refers to steel slag with a certain temperature.

[0048] In some embodiments, the rotary spray gun 4 includes a powder spraying tube 42, a support tube 43, and a heat insulation tube 44 which are nested from the inside to the outside; the discharge end of the powder spraying tank 3 is connected to the feed end of the powder spraying tube 42 through a connecting tube; and the rotation control device 2 is connected to the support tube 43. The rotary spray gun 4 also includes a paddle 41, which is arranged on the outer periphery of the heat insulation tube 44 and close to one side of the bottom of the ladle 5.

[0049] In the rotary spray gun 4, the outermost insulation tube 44 is used to provide thermal insulation protection for the inner powder spray tube 42 and the support tube 43. The support tube 43 is connected to the rotation control device 2 to control the rotary spray gun 4 to rotate around its axis. When in use, the hot slag to be treated can be added into the cavity of the ladle 5, and the slag can bury the paddle 41 of the rotary spray gun 4. At the same time, through the rotation of the rotary spray gun 4, the paddle 41 stirs the slag, which can make the mixing effect between the reducing agent powder and the slag better.

[0050] In some of the embodiments, the slag processing equipment further includes a lifting control device 1, which is disposed on a machine platform 18, and is used to control the height of the rotary spray gun 4 in the cavity.

[0051] The height of the rotary spray gun 4 in the cavity can be controlled by the lifting control device 1, so that the initial position of the rotary spray gun 4 is close to the bottom wall of the cavity, so that the reducing agent powder and the steel slag have a better mixing effect.

[0052] In some embodiments, the ladle 5 has a steel outlet 9, which is disposed at the bottom of the ladle 5. The ladle 5 further includes a sealing device 10, which is used to close the steel outlet 9.

[0053] Due to the gravity difference between the molten steel and the slag, the molten steel will sink to the bottom of the cavity. The steel outlet 9 is arranged at the bottom of the ladle 5, and the sealing device 10 is used to close the steel outlet 9, which can facilitate the opening of the tuyere device after each slag treatment to allow the molten steel to flow out from the steel outlet 9.

[0054] In some embodiments, the slag processing equipment further includes a commutator 11. The commutator 11 is movably disposed on the discharge side of the steel outlet 9, and is used to receive the material discharged from the steel outlet 9. The commutator 11 includes a first material transport channel and a second material transport channel having different material transport directions.

[0055] Since the molten steel sinks to the bottom of the cavity, when the tuyere device is opened, the molten steel first flows out from the steel outlet 9. The molten steel can be transported through the first material transport channel. When the molten steel in the cavity is discharged and the slag is discharged from the steel outlet 9, the commutator 11 can be moved to transport the slag discharged from the steel outlet 9 through the second material transport channel to achieve separation of the molten steel and the slag.

[0056] In some embodiments, the slag processing equipment further includes a molten steel collecting device 13. The molten steel collecting device 13 is disposed at the discharge side of the first material transport channel, and is used to collect the molten steel discharged from the first material transport channel.

[0057] In some embodiments, the slag processing equipment further includes a chute 14, a blowing device 15, and a slag collecting chamber 17. The chute 14 is arranged at the discharge side of the second material transport channel, and is used to receive the slag discharged from the second material transport channel. The air outlet of the blowing device 15 is arranged toward the discharge side of the chute 14, and is used to quench the slag discharged through the chute 14. The slag collecting chamber 17 is used to receive the slag quenched by the blowing device 15.

[0058] It is understood that air quenching refers to a method in which the steel slag is blown away and broken into particles by high-pressure air when it flows out. The steel slag discharged from the second material conveying channel is transported to the air outlet of the blowing device 15 through the slide 14 for air quenching, and the steel slag after air quenching can be collected in the slag collecting chamber 17, which is convenient for recycling the steel slag.

[0059] In some of the embodiments, the slag processing equipment further includes a dust removal device 12, which is disposed on the machine platform 18; the ladle 5 has an opening for feeding, and the dust removal device 12 is disposed toward the opening.

[0060] Since the reducing agent powder is sprayed into the cavity through the powder spraying pipe 42, more dust will be generated. The dust generated can be collected by the dust removal device 12 arranged toward the opening of the ladle 5.

[0061] In some embodiments, the length of the blade 41 along the axial direction of the rotary spray gun 4 is 200 mm to 800 mm.

[0062] Optionally, the axial length of the blade 41 along the rotating spray gun 4 is 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm or 800mm, or the axial length of the blade 41 along the rotating spray gun 4 may also be within the range between any two of the above lengths.

[0063] In some embodiments, the length of the blade 41 along the radial direction of the rotary spray gun 4 is 200 mm to 800 mm.

[0064] Optionally, the radial length of the blade 41 along the rotating spray gun 4 is 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm or 800mm, or, the radial length of the blade 41 along the rotating spray gun 4 may also be within the range between any two of the above lengths.

[0065] Another embodiment of the present application provides a steel slag treatment method, using any of the above steel slag treatment equipment to treat steel slag, comprising the following steps:

[0066] Add the hot slag to be treated into the cavity of the ladle 5 and make the slag cover the discharge end of the rotary lance 4;

[0067] The steel slag in the cavity is heated by the induction coil 6 to melt the solid metal in the hot steel slag;

[0068] The reducing agent powder is sprayed out at the discharge end of the rotary spray gun 4 through the powder spray tank 3, and the rotary spray gun 4 is controlled to rotate by the rotation control device 2. The reducing agent powder and the hot steel slag are mixed by the rotation of the rotary spray gun 4 to perform a reduction treatment on the hot steel slag.

[0069] The hot slag to be treated is added into the cavity of the ladle 5, and the slag is buried in the discharge end of the rotary spray gun 4. After the slag is added, the slag in the cavity is heated by the induction coil 6. If the slag contains unmelted solid metal, it will heat up and melt under the action of electromagnetic induction. If there is no unmelted solid metal in the slag, the whole iron in the slag will also slowly heat up under the action of electromagnetic induction, thereby enhancing the fluidity of the slag to increase the mixing effect between the reducing agent powder and the slag. The reducing agent powder is then sprayed through the rotary spray gun 4, so that the reducing agent powder is sprayed into the slag through the discharge end of the rotary spray gun 4. At the same time, the rotating spray gun 4 can be used to rotate the reducing agent powder and the slag to mix, so that the slag generates molten metal under the action of the reduction reaction. Under the combined action of blowing and stirring, the molten metal steel contained in the slag and the molten steel generated by the reaction will converge, and due to the gravity difference between the molten steel and the slag, the molten metal steel will sink to the bottom of the cavity, achieving a better separation effect between the molten metal steel and the slag. At the same time, during the reduction reaction, the CO gas generated by the reaction will continue to be stirred and mixed with the slag during the rising process, and continue to react with the slag on the upper layer, increasing the effective utilization rate. The slag treatment method of the present application can make good use of the physical heat of the hot slag, achieve good mixing and reduction effects through blowing and rotary stirring, and can reduce a large amount of FeO in the slag, and reduce P2O5 to the molten steel, which has a better purification effect on the slag. The slag treatment method of the present application can improve the recovery rate of the molten metal steel in the slag and the recycling rate of the slag.

[0070] In some embodiments, the reducing agent powder includes at least one of coal powder, coke powder, carbon powder and ferrosilicon powder.

[0071] Exemplarily, the reducing agent powder may react with FeO in the steel slag as follows:

[0072] FeO+C=Fe+CO, or, 2FeO+Si=2Fe+SiO2.

[0073] In some of the embodiments, the initial distance between the discharge end of the rotary spray gun 4 and the bottom wall of the cavity is set to 300 mm to 500 mm.

[0074] Optionally, the initial distance between the discharge end of the rotary spray gun 4 and the bottom wall of the cavity is set to 300mm, 320mm, 340mm, 360mm, 380mm, 400mm, 420mm, 440mm, 460mm, 480mm or 500mm, or the initial distance between the discharge end of the rotary spray gun 4 and the bottom wall of the cavity can also be set within the range between any two of the above distances.

[0075] In some embodiments, the rotation speed of the rotary spray gun 4 is 20 r / min-150 r / min.

[0076] The mixed reduction effect between the reducing agent powder and the steel slag is better within the range of the rotation speed of the rotary spray gun 4. Optionally, the rotation speed of the rotary spray gun 4 is 20r / min, 30r / min, 50r / min, 80r / min, 100r / min, 120r / min, 140r / min or 150r / min, or the rotation speed of the rotary spray gun 45 can also be within the range between any two of the above rotation speeds.

[0077] In some embodiments, the power of the induction coil 6 is 500 kwh / t to 1000 kwh / t.

[0078] In some embodiments, the heating time is 10 min to 30 min.

[0079] Within the range of the power of the induction coil 6 and the time of the heating treatment, the induction coil 6 has a better effect of heating the steel slag in the cavity. Optionally, the power of the induction coil 6 is 500kwh / t, 600kwh / t, 700kwh / t, 800kwh / t, 900kwh / t or 1000kwh / t, or the power of the induction coil 6 can also be within the range between any two of the above powers. Optionally, the time of the heating treatment is 10min, 12min, 14min, 16min, 18min, 20min, 22min, 24min, 26min, 28min or 30min, or the time of the heating treatment can also be within the range between any two of the above times.

[0080] In some embodiments, the reducing agent powder is introduced into the cavity by a carrier gas, and the flow rate of the carrier gas is 40 Nm 3 / h~100Nm 3 / h.

[0081] Optionally, the carrier gas flow rate is 40 Nm 3 / h、50Nm 3 / h、60Nm 3 / h、70Nm 3 / h、80Nm3 / h、90Nm 3 / h or 100Nm 3 / h, or, the carrier gas flow rate may be within the range between any two of the above flow rates.

[0082] In some embodiments, the powder spraying pressure of the powder spraying tank 3 is 0.4 MPa to 0.8 MPa.

[0083] Optionally, the powder spraying pressure of the powder spraying tank 3 is 0.4 MPa, 0.5 MPa, 0.6 MPa, 0.7 MPa or 0.8 MPa, or the powder spraying pressure of the powder spraying tank 3 may also be within a range between any two of the above pressures.

[0084] In some embodiments, the reduction treatment of the hot slag further includes the following steps:

[0085] Open the sealing device 10 to allow the reduced molten steel to flow out of the ladle 5;

[0086] The molten steel is transported through the first material transport channel.

[0087] In some embodiments, after the molten steel is transported through the first material transport channel, the following steps are also included:

[0088] When slag is discharged from the steel outlet 9, the diverter 11 is moved to transfer the slag through the second material transport channel;

[0089] The chute 14 receives the steel slag discharged by the second material transport;

[0090] The steel slag discharged from the discharge side of the chute 14 is quenched by air through the blowing device 15;

[0091] The slag after wind quenching is collected by the slag collecting chamber 17 .

[0092] By using the diverter 11 including the first material transport channel and the second material transport channel with different material transport directions, the molten steel and the slag can be transported and collected through the first material transport channel and the second material transport channel respectively, so as to facilitate the separation of the molten steel and the slag.

[0093] In some of the embodiments, the air outlet pressure of the blowing device 15 is 0.3 MPa~0.8 MPa.

[0094] Optionally, the air outlet pressure of the blowing device 15 is 0.3 MPa, 0.4 MPa, 0.5 MPa, 0.6 MPa, 0.7 MPa or 0.8 MPa, or the air outlet pressure of the blowing device 15 may also be within the range between any two of the above pressures.

[0095] In some embodiments, the air volume of the blowing device 15 is 40000 Nm 3 / h~100000Nm 3 / h.

[0096] Optionally, the air volume of the blowing device 15 is 40000Nm 3 / h、50000Nm 3 / h、60000Nm 3 / h、70000Nm 3 / h、80000Nm 3 / h、90000Nm 3 / h or 100000Nm 3 / h, or, the air volume of the blowing device 15 can also be within the range between any two of the above air volumes.

[0097] In some embodiments, the particle size of the air-quenched steel slag obtained by air-quenching the steel slag is less than 10 mm.

[0098] It can be understood that air-quenched steel slag with spherical particles can be obtained through air quenching.

[0099] The following are specific embodiments

[0100] Example 1

[0101] Production conditions: A ladle with an inner diameter of 2m and a height of 3m contains about 15t~16t of hot slag, which is heated by an induction coil at a power of 600kwh / t for 15min and at a speed of 60Nm 3 / h N2 flow rate to spray carbon powder for reduction. After the reduction treatment is completed, open the sealing device, and let the molten steel enter the liquid collection device through the commutator. After slag appears at the outlet, move the commutator to let the slag slide to the outlet of the blowing device through the slideway. The nozzle of the blowing device sprays high-pressure air with a pressure of 0.6MPa and an air volume of 80000Nm 3 / h, the steel slag is sprayed into wind-quenched steel slag with spherical particles of equivalent diameter <10mm and enters the slag collecting chamber.

[0102] Production results: After testing, the total iron content in the steel slag was reduced from 20% to 4%, and the P2O5 content was reduced from 1.8% to 0.14%.

[0103] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0104] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims, and the description and drawings may be used to interpret the contents of the claims.

Claims

1. A slag processing equipment, characterized in that: It includes a machine, a powder spraying tank, a connecting pipe, a rotary spray gun, a rotary control device, a ladle and an induction coil; The powder spray can is arranged on the machine platform, and the powder spray can is used for spraying reducing agent powder; The ladle has a cavity for holding steel slag; the induction coil is wound on the outer wall of the ladle, and the induction coil is used to heat the steel slag in the cavity; The rotary spray gun is arranged on the machine platform; the rotary spray gun can rotate around its axis; The discharge end of the rotary spray gun is arranged in the cavity; the discharge end of the powder spray tank is connected to the feed end of the rotary spray gun through the connecting pipe, which is used to spray the reducing agent powder into the cavity; the rotation control device is arranged on the machine platform, and the rotation control device is connected to the rotary spray gun to control the rotation of the rotary spray gun.

2. The slag processing equipment according to claim 1, characterized in that: The rotary spray gun comprises a powder spraying pipe, a support pipe and a heat-insulating pipe which are nested in sequence from the inside to the outside; the discharge end of the powder spraying tank is connected to the feed end of the powder spraying pipe through the connecting pipe; the rotation control device is connected to the support pipe; the rotary spray gun also comprises a paddle, which is arranged on the periphery of the heat-insulating pipe and close to one side of the bottom of the ladle; and / or, The slag processing equipment also includes a lifting control device, which is arranged on the machine platform; the lifting control device is connected to the rotary spray gun, and the lifting control device is used to control the setting height of the rotary spray gun in the cavity.

3. The slag processing equipment according to any one of claims 1 to 2, characterized in that: The ladle has a steel outlet, and the steel outlet is arranged at the bottom of the ladle; the ladle also includes a sealing device, and the sealing device is used to close the steel outlet.

4. The slag processing equipment according to claim 3, characterized in that: The slag processing equipment also includes a commutator; the commutator is movably arranged on the discharge side of the steel outlet, and is used to receive the material discharged from the steel outlet; the commutator includes a first material transport channel and a second material transport channel with different material transport directions.

5. The slag processing equipment according to claim 4, characterized in that: The slag processing equipment also includes a molten steel collecting device; the molten steel collecting device is arranged on the discharge side of the first material transport channel, and the molten steel collecting device is used to collect the molten steel discharged from the first material transport channel.

6. The slag processing equipment according to claim 4, characterized in that: The slag processing equipment also includes a slide, a blowing device and a slag collection chamber; The slideway is arranged at the discharge side of the second material transport channel, and is used to receive the steel slag discharged from the second material transport channel; The air outlet of the blowing device is arranged toward the discharge side of the slideway, and is used for air quenching the steel slag discharged through the slideway; The slag collecting chamber is used to receive the steel slag that has been quenched by the blowing device.

7. A method for treating steel slag, characterized in that: The steel slag treatment device according to any one of claims 1 to 6 is used to treat steel slag, comprising the following steps: Adding the hot steel slag to be treated into the cavity of the ladle and making the steel slag cover the discharge end of the rotary spray gun; The steel slag in the cavity is heated by the induction coil to melt the solid metal in the hot steel slag; The reducing agent powder is sprayed out at the discharge end of the rotary spray gun through the powder spray tank, and the rotary spray gun is controlled to rotate through the rotation control device. The reducing agent powder and the hot steel slag are mixed through the rotation of the rotary spray gun to perform reduction treatment on the hot steel slag.

8. The steel slag treatment method according to claim 7, characterized in that: The power of the induction coil is 500kwh / t~1000kwh / t; and / or, The heating treatment time is 10 min to 30 min; and / or, The reducing agent powder is introduced into the cavity through a carrier gas, and the flow rate of the carrier gas is 40 Nm 3 / h~100Nm 3 / h; and / or, The powder spraying pressure of the powder spraying tank is 0.4MPa~0.8MPa.

9. The steel slag treatment method according to claim 7, characterized in that: The ladle has a steel outlet, which is arranged at the bottom of the ladle; the ladle also includes a sealing device, which is used to close the steel outlet; the slag processing equipment also includes a commutator; the commutator is movably arranged on the discharge side of the steel outlet, and is used to receive the material discharged from the steel outlet; the commutator includes a first material transport channel and a second material transport channel with different material transport directions; After the hot slag is reduced, the following steps are also included: Opening the sealing device to allow the molten steel obtained by reduction to flow out of the ladle; The molten steel is transported through the first material transport channel.

10. The steel slag treatment method according to claim 9, characterized in that: The slag processing equipment further includes a chute, a blowing device and a slag collecting chamber; the chute is arranged at the discharge side of the second material transport channel, and is used to receive the slag discharged from the second material transport channel; the air outlet of the blowing device is arranged toward the discharge side of the chute, and is used to quench the slag discharged through the chute; the slag collecting chamber is used to receive the slag quenched by the blowing device; After the molten steel is transported through the first material transport channel, the following steps are further included: When slag is discharged from the steel outlet, the diverter is moved to transfer the slag through the second material transport channel; The chute receives the steel slag discharged by the second material transport; The steel slag discharged from the discharge side of the slideway is subjected to air quenching by the air blowing device; The slag that has been quenched by wind is collected by the slag collecting chamber.

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