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 and a steel ladle, the powder spraying tank is arranged on the machine table and used for spraying reducing agent powder; the steel ladle is provided with a cavity used for containing steel slag. The rotary spray gun is arranged on the machine table; the rotary spray gun can rotate around the axis; 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 rotation control device is arranged on the rack 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 and a ladle;

[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;

[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 embodiments, the slag processing equipment also includes a fixed pulley and a traction member, the fixed pulley is arranged on the machine platform, one end of the traction member is connected to the lifting control device, and the other end is connected to the rotary spray gun after passing through the fixed pulley; the traction member is used to pull the rotary spray gun to adjust the setting height of the rotary spray gun in the cavity.

[0011] In some embodiments, the slag processing equipment also includes a rotary joint and a coupling; one end of the coupling is connected to the rotary joint, and the other end is connected to the rotary spray gun; the discharge end of the connecting pipe is connected to the rotary joint.

[0012] In some of the embodiments, the slag processing equipment further includes a dust removal device, which is disposed on the machine platform; the ladle has an opening for feeding, and the dust removal device is disposed toward the opening.

[0013] In some embodiments, the length of the blade along the axial direction of the rotary spray gun is 200 mm to 800 mm.

[0014] In some embodiments, the length of the blade along the radial direction of the rotary spray gun is 200 mm to 800 mm.

[0015] 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.

[0016] 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:

[0017] 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;

[0018] 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.

[0019] In some embodiments, the reducing agent powder includes at least one of coal powder, coke powder, carbon powder and ferrosilicon powder.

[0020] In some embodiments, an initial distance between a discharge end of the rotary spray gun and a bottom wall of the cavity is set to 300 mm to 500 mm.

[0021] In some embodiments, the rotation speed of the rotary spray gun is 20 r / min~150 r / min.

[0022] In some embodiments, the reducing agent powder is introduced in an amount of 20 kg / min to 50 kg / 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 20 Nm 3 / h~80Nm 3 / h.

[0024] In some embodiments, the powder spraying pressure of the powder spraying can is 0.3MPa~0.5MPa.

[0025] In some embodiments, the slag processing equipment further 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; the ladle has a steel outlet, and the steel outlet is disposed at the bottom of the ladle; the ladle further includes a sealing device, and the sealing device is used to close the steel outlet;

[0026] The slag treatment method further comprises the following steps:

[0027] After each reduction treatment is completed, the sealing device is opened to allow the molten steel obtained by reducing the hot slag to flow out from the steel outlet;

[0028] Adding the hot slag to be treated into the cavity again;

[0029] Each time the hot slag to be treated is added into the cavity, the distance between the discharge end of the rotary spray gun and the bottom wall of the cavity is controlled by the lifting control device to increase by 500 mm to 1000 mm.

[0030] 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 reducing agent powder can be 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, through the rotation of the rotary spray gun, the reducing agent powder and the slag can be mixed, so that the slag generates metal molten steel under the action of the reduction reaction. Under the combined action of spraying and stirring, the metal molten 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 metal molten steel will sink to the bottom of the cavity, achieving a better separation effect between the metal molten 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 steel slag treatment equipment of the present application can make good use of the physical heat of hot steel slag during use, achieve good mixing and reduction effects through blowing and rotary stirring, can reduce a large amount of FeO in the steel slag, and reduce P2O5 to molten steel liquid, and has a good purification effect on the steel slag. The steel slag treatment equipment of the present application can be used for recycling steel slag, and can improve the recovery rate of metal steel liquid in steel slag and the recycling rate of steel slag. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic diagram of the structure of a slag treatment device provided in one embodiment of the present application;

[0032] Figure 2 A schematic diagram of the partial structure of a rotary spray gun provided in one embodiment of the present application.

[0033] Description of Reference Numerals

[0034] 1. Powder spray tank; 2. Connecting pipe; 3. Rotary joint; 4. Coupling; 5. Rotary spray gun; 51. Paddle; 52. Powder spray tube; 53. Support tube; 54. Insulation tube; 6. Rotation control device; 7. Lifting control device; 8. Fixed pulley; 9. Traction piece; 10. Dust removal device; 11. Ladle; 12. Steel outlet; 13. Sealing device; 14. Steel slag; 15. Molten steel; 16. Machine. DETAILED DESCRIPTION

[0035] 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.

[0036] 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.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] Reference Figure 1As shown, an embodiment of the present application provides a slag processing device, including a machine 16, a powder spray tank 1, a connecting pipe 2, a rotary spray gun 5, a rotation control device 6 and a ladle 11. The powder spray tank 1 is arranged on the machine 16, and the powder spray tank 1 is used to spray reducing agent powder. The ladle 11 has a cavity for holding steel slag. The rotary spray gun 5 is arranged on the machine 16. The rotary spray gun 5 can rotate around its axis. The discharge end of the rotary spray gun 5 is arranged in the cavity. The discharge end of the powder spray tank 1 is connected to the feed end of the rotary spray gun 5 through the connecting pipe 2, and is used to spray reducing agent powder into the cavity. The rotation control device 6 is arranged on the machine 16, and the rotation control device 6 is connected to the rotary spray gun 5 to control the rotation of the rotary spray gun 5.

[0041] 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 11, and the slag can bury the discharge end of the rotary spray gun 5. After the slag is added, the reducing agent powder can be sprayed through the rotary spray gun 5, so that the reducing agent powder is sprayed into the slag through the discharge end of the rotary spray gun 5. At the same time, through the rotation of the rotary spray gun 5, the reducing agent powder and the slag can be mixed, so that the slag generates metal molten steel under the action of the reduction reaction. Under the combined action of spraying and stirring, the metal molten 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 metal molten steel will sink to the bottom of the cavity, achieving a better separation effect between the metal molten 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 steel slag treatment equipment of the present application can make good use of the physical heat of hot steel slag during use, achieve good mixing and reduction effects through blowing and rotary stirring, can reduce a large amount of FeO in the steel slag, and reduce P2O5 to molten steel liquid, and has a good purification effect on the steel slag. The steel slag treatment equipment of the present application can be used for recycling steel slag, and can improve the recovery rate of metal steel liquid in steel slag and the recycling rate of steel slag.

[0042] It can be understood that hot steel slag refers to steel slag with a certain temperature.

[0043] Reference Figure 2 As shown, in some embodiments, the rotary spray gun 5 includes a powder spraying pipe 52, a support pipe 53 and a heat insulation pipe 54 which are nested from the inside to the outside. The discharge end of the powder spraying tank 1 is connected to the feed end of the powder spraying pipe 52 through the connecting pipe 2. The rotation control device 6 is connected to the support pipe 53. The rotary spray gun 5 also includes a paddle 51, which is arranged on the periphery of the heat insulation pipe 54 and close to one side of the bottom of the ladle 11.

[0044] In the rotary spray gun 5, the outermost insulation tube 54 is used to provide thermal insulation protection for the inner powder spray tube 52 and the support tube 53. The support tube 53 is connected to the rotation control device 6 to control the rotary spray gun 5 to rotate around its axis. When in use, the hot slag to be treated can be added into the cavity of the ladle 11, and the slag can bury the paddle 51 of the rotary spray gun 5. At the same time, through the rotation of the rotary spray gun 5, the paddle 51 stirs the slag, which can make the mixing effect between the reducing agent powder and the slag better.

[0045] In some embodiments, the slag processing equipment further includes a lifting control device 7, which is disposed on the machine platform 16. The lifting control device 7 is connected to the rotary lance 5, and the lifting control device 7 is used to control the setting height of the rotary lance 5 in the cavity.

[0046] The height of the rotary spray gun 5 in the cavity can be controlled by the lifting control device 7, so that the initial position of the rotary spray gun 5 is close to the bottom wall of the cavity, so that the reducing agent powder and the steel slag have a better mixing effect.

[0047] In some embodiments, the slag processing equipment further includes a fixed pulley 8 and a traction member 9, wherein the fixed pulley 8 is disposed on the machine platform 16, one end of the traction member 9 is connected to the lifting control device 7, and the other end is connected to the rotary lance 5 after passing through the fixed pulley 8. The traction member 9 is used to pull the rotary lance 5 to adjust the setting height of the rotary lance 5 in the cavity.

[0048] In some embodiments, the slag processing equipment further comprises a rotary joint 3 and a coupling 4. One end of the coupling 4 is connected to the rotary joint 3, and the other end is connected to the rotary lance 5. The discharge end of the connecting pipe 2 is connected to the rotary joint 3.

[0049] In some embodiments, the slag processing equipment further comprises a dust removal device 10, and the dust removal device 10 is disposed on the machine platform 16. The ladle 11 has an opening for feeding, and the dust removal device 10 is disposed toward the opening.

[0050] Since the reducing agent powder is sprayed into the cavity through the powder spraying pipe 52, more dust will be generated. The dust removal device 10 arranged toward the opening of the ladle 11 can collect the generated dust.

[0051] In some embodiments, the length of the blade 51 along the axial direction of the rotary spray gun 5 is 200 mm to 800 mm.

[0052] Optionally, the axial length of the blade 51 along the rotating spray gun 5 is 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm or 800mm, or the axial length of the blade 51 along the rotating spray gun 5 may also be within the range between any two of the above lengths.

[0053] In some embodiments, the length of the blade 51 along the radial direction of the rotary spray gun 5 is 200 mm to 800 mm.

[0054] Optionally, the radial length of the blade 51 along the rotating spray gun 5 is 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm, 650mm, 700mm, 750mm or 800mm, or the radial length of the blade 51 along the rotating spray gun 5 may also be within the range between any two of the above lengths.

[0055] In some embodiments, the ladle 11 has a steel outlet 12, and the steel outlet 12 is arranged at the bottom of the ladle 11. The ladle 11 also includes a sealing device 13, and the sealing device 13 is used to close the steel outlet 12.

[0056] 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 12 is arranged at the bottom of the ladle 11, and the sealing device 13 is used to close the steel outlet 12, so that the tuyere device can be opened to allow the molten steel to flow out from the steel outlet 12 after each slag treatment is completed.

[0057] 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:

[0058] Add the hot slag to be treated into the cavity of the ladle 11 and make the slag cover the discharge end of the rotary lance 5;

[0059] The reducing agent powder is sprayed out from the discharge end of the rotary spray gun 5 through the powder spray tank 1, and the rotary spray gun 5 is controlled to rotate through the rotation control device 6. The reducing agent powder and the hot steel slag are mixed through the rotation of the rotary spray gun 5 to perform a reduction treatment on the hot steel slag.

[0060] The hot steel slag to be treated is added into the cavity of the ladle 11, and the steel slag is buried in the discharge end of the rotary spray gun 5. After the steel slag is added, the reducing agent powder can be sprayed through the rotary spray gun 5, so that the reducing agent powder is sprayed into the steel slag through the discharge end of the rotary spray gun 5. At the same time, through the rotation of the rotary spray gun 5, the reducing agent powder and the steel slag can be mixed, so that the steel slag generates metal steel liquid under the action of the reduction reaction. Under the combined action of spraying and stirring, the metal steel liquid contained in the steel slag and the steel liquid generated by the reaction will converge, and due to the gravity difference between the steel liquid and the steel slag, the metal steel liquid will sink to the bottom of the cavity, achieving a better separation effect between the metal steel liquid and the steel 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 steel slag during the rising process, and continue to react with the steel slag on the upper layer, increasing the effective utilization rate. The steel slag treatment method of the present application can make good use of the physical heat of hot steel slag, achieve good mixing and reduction effects through blowing and rotary stirring, and can reduce a large amount of FeO in the steel slag, and reduce P2O5 to molten steel liquid, which has a good purification effect on the steel slag. The steel slag treatment method of the present application can improve the recovery rate of metal steel liquid in the steel slag and the recycling rate of the steel slag.

[0061] In some embodiments, the reducing agent powder includes at least one of coal powder, coke powder, carbon powder and ferrosilicon powder.

[0062] Exemplarily, the reducing agent powder may react with FeO in the steel slag as follows:

[0063] FeO+C=Fe+CO, or, 2FeO+Si=2Fe+SiO2.

[0064] In some embodiments, the initial distance between the discharge end of the rotary spray gun 5 and the bottom wall of the cavity is set to 300 mm to 500 mm.

[0065] Optionally, the initial distance between the discharge end of the rotary spray gun 5 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 5 and the bottom wall of the cavity can also be set within the range between any two of the above distances.

[0066] In some embodiments, the rotation speed of the rotary spray gun 5 is 20 r / min-150 r / min.

[0067] 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 5. Optionally, the rotation speed of the rotary spray gun 5 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 5 can also be within the range between any two of the above rotation speeds.

[0068] In some embodiments, the reducing agent powder is introduced in an amount of 20 kg / min to 50 kg / min.

[0069] Within the range of the above-mentioned amount of reducing agent powder, a better mixed reduction between reducing agent powder and steel slag can be achieved, and the recovery rate of molten metal in steel slag and the recycling rate of steel slag can be improved. Optionally, the amount of reducing agent powder introduced is 20kg / min, 25kg / min, 30kg / min, 35kg / min, 40kg / min, 45kg / min or 50kg / min, or the amount of reducing agent powder introduced can also be within the range between any two of the above-mentioned amounts.

[0070] 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 20 Nm 3 / h~80Nm 3 / h.

[0071] Optionally, the carrier gas flow rate is 20 Nm 3 / h、25Nm 3 / h、30Nm 3 / h、35Nm 3 / h、40Nm 3 / h、45Nm 3 / h、50Nm 3 / h、55Nm 3 / h、60Nm 3 / h、65Nm 3 / h、70Nm 3 / h、75Nm 3 / h or 80Nm 3 / h, or, the carrier gas flow rate may be within the range between any two of the above flow rates.

[0072] In some embodiments, the carrier gas includes nitrogen.

[0073] In some embodiments, the powder spraying pressure of the powder spraying can 1 is 0.3 MPa-0.5 MPa.

[0074] By applying a certain pressure to spray the reducing agent powder into the cavity and mix it with the steel slag, a better mixed reduction between the reducing agent powder and the steel slag can be achieved, and the recovery rate of the molten metal in the steel slag and the recycling rate of the steel slag can be improved. Optionally, the powder spraying pressure of the powder spraying tank 1 is 0.3MPa, 0.32MPa, 0.34MPa, 0.36MPa, 0.38MPa, 0.4MPa, 0.42MPa, 0.44MPa, 0.46MPa, 0.48MPa or 0.5MPa, or the powder spraying pressure of the powder spraying tank 1 can also be within the range between any two of the above pressures.

[0075] In some of the embodiments, the following steps are also included:

[0076] After each reduction treatment is completed, the sealing device 13 is opened to allow the molten steel obtained by reducing the hot slag to flow out from the steel outlet 12;

[0077] Adding the hot slag to be treated into the cavity again;

[0078] Each time the hot slag to be treated is added into the cavity, the distance between the discharge end of the rotary lance 5 and the bottom wall of the cavity is controlled by the lifting control device 7 to increase by 500 mm to 1000 mm.

[0079] It is understandable that after the molten steel after the primary reaction is discharged, the sealing device 13 can be closed when slag appears at the steel outlet 12, and the treated slag will be retained in the cavity. After the slag to be treated is added to the cavity again, the distance between the discharge end of the rotary spray gun 5 and the bottom wall of the cavity can be increased by 500mm~1000mm through the lifting control device 7, so that the spraying position of the reducing agent powder is closer to the untreated slag, so as to achieve a better treatment effect on the slag.

[0080] Optionally, each time the hot steel slag to be treated is added to the cavity, the distance between the discharge end of the rotary spray gun 5 and the bottom wall of the cavity is controlled by the lifting control device 7 to increase by 500mm, 600mm, 700mm, 800mm, 900mm or 1000mm, or, each time the hot steel slag to be treated is added to the cavity, the distance between the discharge end of the rotary spray gun 5 and the bottom wall of the cavity is controlled by the lifting control device 7 to increase within the range between any two of the above distances.

[0081] The following are specific embodiments

[0082] Example 1

[0083] Production conditions: A 210t converter corresponds to a ladle with an inner diameter of 3.8m and a height of 3.5m, which holds about 80t of hot slag. The slag is tapped 5 times in succession. After each tapping of the molten steel, about 2 / 3 of the slag is poured out. When the converter is splashing slag to protect the furnace (the residual slag is no longer poured out after splashing slag to protect the furnace, and the next furnace is directly charged and smelted), the ladle is transported to the rotary spraying treatment station and carbon powder is sprayed for reduction.

[0084] Production parameters: powder spray tank pressure 0.48MPa, N2 flow 50Nm 3 / h, the reducing agent powder feeding amount is 45kg / h, and each spraying is 15min. The rotating spray gun is inserted for the first time at a distance of 500mm from the bottom wall of the ladle 11 cavity, and is raised by 400mm each time, with a rotation speed of 80r / min.

[0085] Production results: After the fifth treatment, the sealing device was opened and 15 tons of molten steel was released. After testing, the FeO content in the slag was reduced from 25% to 5%, and the P2O5 content was reduced from 1.2% to 0.11%.

[0086] The steel slag treatment equipment and steel slag treatment method of the present application can process the steel slag for recycling, and can improve the recovery rate of the molten metal in the steel slag and the recycling rate of the steel slag.

[0087] 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.

[0088] 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 and a ladle; 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 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 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.

3. The slag processing equipment according to claim 1, characterized in that: 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.

4. The slag processing equipment according to claim 3, characterized in that: The slag processing equipment also includes a fixed pulley and a traction member, the fixed pulley is arranged on the machine platform, one end of the traction member is connected to the lifting control device, and the other end is connected to the rotary spray gun after passing through the fixed pulley; the traction member is used to pull the rotary spray gun to adjust the setting height of the rotary spray gun in the cavity.

5. The slag processing equipment according to claim 1, characterized in that: The slag processing equipment further comprises a rotary joint and a coupling; one end of the coupling is connected to the rotary joint, and the other end is connected to the rotary spray gun; the discharge end of the connecting pipe is connected to the rotary joint; and / or, The slag processing equipment further comprises a dust removal device, which is arranged on the machine platform; the ladle has an opening for feeding, and the dust removal device is arranged towards the opening.

6. The slag processing equipment according to claim 2, characterized in that: The length of the blade along the axial direction of the rotary spray gun is 200 mm to 800 mm; and / or, The length of the paddle along the radial direction of the rotary spray gun is 200 mm to 800 mm.

7. The slag processing equipment according to any one of claims 1 to 6, 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.

8. A method for treating steel slag, characterized in that: Using the steel slag processing equipment according to any one of claims 1 to 7 to process steel slag comprises 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 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.

9. The steel slag treatment method according to claim 8, characterized in that: The reducing agent powder includes at least one of coal powder, coke powder, carbon powder and ferrosilicon powder; and / or, The initial distance between the discharge end of the rotary spray gun and the bottom wall of the cavity is set to 300 mm to 500 mm; and / or, The rotation speed of the rotary spray gun is 20r / min~150r / min; and / or, The amount of reducing agent powder introduced is 20kg / min to 50kg / 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 20 Nm 3 / h~80Nm 3 / h; and / or, The powder spraying pressure of the powder spraying tank is 0.3MPa~0.5MPa.

10. The steel slag treatment method according to claim 8 or 9, characterized in that: The slag processing equipment further 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; 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 treatment method further comprises the following steps: After each reduction treatment is completed, the sealing device is opened to allow the molten steel obtained by reducing the hot slag to flow out from the steel outlet; Adding the hot slag to be treated into the cavity again; Each time the hot slag to be treated is added into the cavity, the distance between the discharge end of the rotary spray gun and the bottom wall of the cavity is controlled by the lifting control device to increase by 500 mm to 1000 mm.

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