Method for producing spray coating from used hot-metal ladle waste bricks and crushing device

Abstract

The invention discloses a method and a crushing device for producing a spray coating from used hot-metal ladle waste bricks, relates to the technical field of production of hot-metal ladle slag isolation coatings, and provides the following scheme that the method comprises the following steps: step (1), collecting the hot-metal ladle waste bricks subjected to tank disassembly, and removing residual iron and impurities; (2) the hot-metal ladle waste bricks are crushed into particles with the particle sizes of 3-1 and 1-0 through a crushing device, and hot-metal ladle waste brick powder is obtained and bagged for use; comprising a collecting hopper, a connecting block is fixed to the side wall of the collecting hopper, a fixing base is connected to the top of one side of the connecting block, and a discharging hole is formed in the middle of the fixing base. According to the method, the used hot-metal ladle waste bricks contain a large amount of SiC and C components, the slag separation effect can be improved, particularly, a hot-state slagging-off process is adopted in a steel mill, so that the C component in the spray coating cannot be volatilized in a large amount before pretreatment, and the method has high adaptability.

Description

Technical Field

[0001] The invention relates to the technical field of slag-isolating coating production for molten iron tanks, and in particular to a method for producing spray coating from used waste bricks of molten iron tanks and a crushing device. Background Art

[0002] The molten iron tank is used to hold molten iron. Before entering the converter for smelting, the molten iron is pretreated to remove impurity elements or recover valuable elements, including desiliconization, desulfurization, and dephosphorization (commonly known as the three dephosphorizations) of the molten iron, as well as vanadium, niobium, and tungsten extraction from the molten iron.

[0003] The process method for pretreatment of hot metal in hot metal tanks mainly adopts injection method and mechanical stirring method. The main components of desulfurizer are passivation lime, passivation magnesium powder, fluorite, etc., and the chemical composition is mainly CaO, MgO, CaF2.

[0004] The damage of lining bricks of molten iron tanks is mainly caused by melting loss and thermal shock peeling, and the service life is about 1,000 times. The residual bricks handed over for dismantling after the use of molten iron tanks are generally seriously damaged at the slag line. Some lining bricks may be replaced during minor repairs. The residual bricks in the middle and lower parts and the bottom are relatively thick, the slag layer is not thick, there is no obvious slag intrusion, and the original brick layer remains intact.

[0005] The thickness of the lining bricks of the hot metal ladle is 190mm-210mm. Generally, the remaining bricks of a large hot metal ladle (more than 200 tons) are about 120-160 tons. Since the residue is closely combined with the original bricks, it is difficult to clean the surface residue. When recycling the remaining bricks of the hot metal ladle, thicker original bricks will be removed during the slag removal process, and a large amount of labor costs will be incurred. This work focuses on the feasibility of using the spent hot metal ladle bricks directly for non-critical products without slag removal.

[0006] A quick method for using used hot metal ladle bricks, which is used for producing hot metal ladle mouth slag spray coating materials according to the appearance characteristics and chemical composition of the used hot metal ladle bricks, and optimizes the product use effect and economic benefits by reasonably adjusting the ratio of binder and sintering agent, and minimizes resource waste. Summary of the invention

[0007] The present invention adopts the following technical solutions:

[0008] A method for producing spray coating from used iron ladle waste bricks, comprising the following steps:

[0009] Step (1): Collect the waste bricks from the dismantled molten iron tank and remove the residual iron and debris;

[0010] Step (2): crushing the waste iron ladle bricks into 3-1 and 1-0 particle sizes using a crushing device to obtain waste iron ladle brick powder, which is bagged for later use;

[0011] Step (3): add 70-80 parts of iron molten ladle waste brick powder, 15-20 parts of alumina powder or gem powder, 2-6 parts of ball clay, 1 part of sodium bentonite, 2-6 parts of 625 alumina cement or 70 cement, 1-2 parts of silica fume, 0.5-1 part of carboxymethyl cellulose, and 0.1-0.15 parts of sodium hexametaphosphate into a mixer, mix for 6-8 minutes, discharge the material, bag it, and store it.

[0012] Preferably, the used iron molten ladle waste brick powder contains 62-65wt% Al2O3, 2.5-3.5wt% Fe2O3, 2.5-3.0wt% CaO, 12-15wt% SiO2, 6-9wt% SiC and 8-10wt% C.

[0013] Preferably, the mass ratio of the used iron ladle waste brick powder, wherein the component with a particle size of 3-1 mm and the component with a particle size of 1-0 mm is 40-50:25-35.

[0014] Preferably, the alumina powder comprises Al2O3≥84.5wt%, Fe2O3≤2.0wt%, CaO≤0.45wt%, SiO2≤7.5wt%, K2O+Na2O≤0.4wt%, and loss on ignition≤0.25wt%; and the gem powder comprises Al2O3≥44wt%, Fe2O3≤1.7wt%, CaO≤0.4wt%, SiO2≥50wt%, K2O+Na2O≤0.3wt%, and loss on ignition≤0.

[0015] Preferably, the alumina powder or gem powder has a particle size of 325 mesh, and the silica fume is 92 silica fume.

[0016] A crushing device for a method of producing spray coating from used waste bricks from a molten iron ladle, comprising a collecting bucket, a connecting block being fixed to a side wall of the collecting bucket, a fixing seat being connected to a top of one side of the connecting block, a feeding hole being arranged in the middle of the fixing seat, and a conical groove being arranged on an upper end face of the fixing seat, a supporting rod being connected to the top of the fixing seat, an L-shaped supporting plate being fixed to the upper end face of the supporting rod, a driving mechanism being installed on one side of a vertical section of the L-shaped supporting plate, a primary crushing assembly connected to the driving mechanism being installed on the lower end face of a horizontal section of the L-shaped supporting plate, a secondary crushing assembly connected to the driving mechanism being installed on the lower end face of the fixing seat, a stirring assembly being connected to the driving mechanism, three supporting legs being welded at equal distances on the bottom outer wall of the collecting bucket, and a discharging valve being arranged in the middle of the bottom end of the collecting bucket.

[0017] Preferably, the driving mechanism includes a servo motor installed on the top of one side of the vertical section of the L-shaped support plate, the output end of the servo motor is connected to a transmission rod, the top of the outer wall of the transmission rod is fixedly sleeved with a first pulley, and the bottom of the outer wall of the transmission rod is fixedly sleeved with a first bevel gear.

[0018] Preferably, the primary crushing assembly includes a support plate fixed on one side of the vertical section of the L-shaped support plate, a hydraulic push rod is installed on the lower end surface of the horizontal section of the L-shaped support plate, the bottom end of the hydraulic push rod is connected to a rotating seat, the lower end of the rotating seat is connected to a spline rod, the outer sliding sleeve of the spline rod is connected to a spline sleeve, the spline sleeve slides through the support plate, the outer wall of the spline sleeve and the second pulley is fixedly sleeved above the support plate, a transmission belt is connected between the first pulley and the second pulley, five support wheels are equidistantly installed on the side of the lower end surface of the second pulley, an annular limit groove is provided on the support plate and on the outer side of the spline sleeve, the five support wheels are all rollingly engaged in the annular limit groove, the bottom end of the spline rod is connected to a crushing cone, and crushing teeth are equidistantly arranged on the inclined surface of the crushing cone.

[0019] Preferably, the secondary crushing assembly includes two end plates symmetrically fixed on the lower end surface of the fixed seat, two crushing rollers are rotatably installed between the two end plates through bearings, one end of the two crushing rollers is installed with a transmission gear, the two transmission gears are meshed with each other, the other end of one of the crushing rollers is connected to a connecting rod, one end of the connecting rod is connected to a second bevel gear, and the first bevel gear and the second bevel gear are meshed with each other.

[0020] Preferably, the stirring assembly includes a rotating rod connected to the bottom end of the transmission rod, and the stirring rod is fixed to the bottom outer wall of the rotating rod.

[0021] The beneficial effects of the present invention are:

[0022] 1. The waste bricks of the used molten iron tank contain a large amount of SiC and C components, which is beneficial to improving the slag separation effect. In particular, the steel plant adopts the hot slag removal process, so that the C component in the spray coating will not volatilize in large quantities before pretreatment, making the invention have strong adaptability.

[0023] 2. The Fe2O3, CaO and TiO2 components in the slag on the surface of the waste bricks of the used molten iron tank can promote sintering in a medium and low temperature environment, and the same product performance can be obtained by reducing the amount of cement and clay added to the spray coating.

[0024] 3. Since the used iron ladle waste bricks do not contain moisture, there is no need to dry and remove water after crushing, which can save energy and labor costs.

[0025] 4. The waste bricks from the molten iron tank are directly crushed into the required particle size and used in the production of slag separation spray coating, which maximizes the use of waste brick resources, reduces the pollution of the cleaned residue to the environment, and achieves the goal of low-carbon environmental protection.

[0026] 5. The present invention can also be used for the production of slag separation coatings for torpedo tank mouths and slag tanks such as steel slag, iron slag, and refined slag by appropriately adjusting the particle size and ratio according to the use conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the stereoscopic structure from a first perspective of a crushing device for producing spray coating material from used iron ladle waste bricks proposed by the present invention.

[0028] Figure 2 This is a schematic diagram of the stereoscopic structure from a second perspective of a crushing device for producing spray coating material from used iron ladle waste bricks proposed by the present invention.

[0029] Figure 3 This is a schematic diagram of the stereoscopic structure from a third perspective of a crushing device for producing spray coating material from used iron ladle waste bricks proposed by the present invention.

[0030] Figure 4 This is a schematic diagram of the first partial structure of a crushing device for producing spray coating material from used iron ladle waste bricks proposed by the present invention.

[0031] Figure 5 This is a second partial structural schematic diagram of a crushing device for producing spray coating material from used iron ladle waste bricks proposed by the present invention.

[0032] Figure 6 This is a third partial structural schematic diagram of a crushing device for producing spray coating material from used iron ladle waste bricks proposed by the present invention.

[0033] Figure 7 The present invention proposes a crushing device for producing spray coating material from waste bricks of used hot metal tanks Figure 6 Enlarged structural diagram at A in the middle.

[0034] In the figure: 1. collecting bucket; 2. supporting leg; 3. fixing seat; 4. crushing cone; 5. supporting plate; 6. spline rod; 7. transmission belt; 8. L-shaped supporting plate; 9. first pulley; 10. transmission rod; 11. first bevel gear; 12. supporting rod; 13. servo motor; 14. connecting block; 15. hydraulic push rod; 16. rotating seat; 17. connecting rod; 18. discharge valve; 19. rotating rod; 20. stirring rod; 21. end plate; 22. crushing roller; 23. transmission gear; 24. second bevel gear; 25. spline sleeve; 26. discharge hole; 27. crushing teeth; 28. supporting wheel; 29. ​​annular limit groove; 30. second pulley. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the present invention.

[0036] Reference Figure 1-7A crushing device for producing spray coating material from waste bricks of used molten iron ladle comprises a collecting bucket 1, a connecting block 14 is fixed to the side wall of the collecting bucket 1, a fixing seat 3 is connected to the top of one side of the connecting block 14, a feeding hole 26 is arranged in the middle of the fixing seat 3, and a conical groove is provided on the upper end surface of the fixing seat 3, a supporting rod 12 is connected to the top of the fixing seat 3, an L-shaped supporting plate 8 is fixed to the upper end surface of the supporting rod 12, a driving mechanism is installed on one side of the vertical section of the L-shaped supporting plate 8, a primary crushing assembly connected to the driving mechanism is installed on the lower end surface of the horizontal section of the L-shaped supporting plate 8, a secondary crushing assembly connected to the driving mechanism is installed on the lower end surface of the fixing seat 3, a stirring assembly is connected to the driving mechanism, three supporting legs 2 are welded at equal distances on the bottom outer wall of the collecting bucket 1, and a discharging valve 18 is arranged in the middle of the bottom end of the collecting bucket 1;

[0037] The driving mechanism includes a servo motor 13 installed on the top of one side of the vertical section of the L-shaped support plate 8, the output end of the servo motor 13 is connected to a transmission rod 10, the top of the outer wall of the transmission rod 10 is fixedly sleeved with a first pulley 9, and the bottom of the outer wall of the transmission rod 10 is fixedly sleeved with a first bevel gear 11;

[0038] The first-stage crushing assembly includes a support plate 5 fixed on one side of the vertical section of the L-shaped support plate 8, a hydraulic push rod 15 is installed on the lower end surface of the horizontal section of the L-shaped support plate 8, the bottom end of the hydraulic push rod 15 is connected to a rotating seat 16, the lower end of the rotating seat 16 is connected to a spline rod 6, the outer sliding sleeve of the spline rod 6 is sleeved with a spline sleeve 25, the spline sleeve 25 slides through the support plate 5, the outer wall of the spline sleeve 25 and the upper part of the support plate 5 are sleeved with a second pulley 30, a transmission belt 7 is connected between the first pulley 9 and the second pulley 30, five support wheels 28 are installed at equal distances on the side of the lower end surface of the second pulley 30, an annular limiting groove 29 is opened on the support plate 5 and located on the outer side of the spline sleeve 25, the five support wheels 28 are all rollingly engaged in the annular limiting groove 29, the bottom end of the spline rod 6 is connected to a crushing cone 4, and crushing teeth 27 are arranged at equal distances on the inclined surface of the crushing cone 4;

[0039] The secondary crushing assembly includes two end plates 21 symmetrically fixed on the lower end surface of the fixed seat 3, two crushing rollers 22 are rotatably mounted between the two end plates 21 through bearings, one end of each of the two crushing rollers 22 is mounted with a transmission gear 23, the two transmission gears 23 are meshed with each other, the other end of one of the crushing rollers 22 is connected to a connecting rod 17, one end of the connecting rod 17 is connected to a second bevel gear 24, and the first bevel gear 11 and the second bevel gear 24 are meshed with each other;

[0040] The stirring assembly includes a rotating rod 19 connected to the bottom end of the transmission rod 10 , and a stirring rod 20 is fixed to the bottom outer wall of the rotating rod 19 .

[0041] Working principle of the crushing device: Place the waste bricks of the molten iron ladle on the fixed seat 3, use the servo motor 13 to drive the transmission rod 10 to rotate, the transmission rod 10 drives the first pulley 9 and the first bevel gear 11 to rotate, and through the transmission of the transmission belt 7, drives the second pulley 30, the spline sleeve 25 and the spline rod 6 to rotate, the spline rod 6 drives the crushing cone 4 to rotate, and at the same time uses the hydraulic push rod 15 to push the spline rod 6 downward, so that the crushing cone 4 rotates and squeezes the waste bricks of the molten iron ladle on the fixed seat 3, so as to realize the crushing of the waste bricks of the molten iron ladle The crushed powder falls from the discharge hole 26, and the first bevel gear 11 drives the second bevel gear 24 and the connecting rod 17 to rotate. The rotation of the connecting rod 17 drives a crushing roller 22 to rotate. At the same time, the meshing action of the two transmission gears 23 makes the two crushing rollers 22 rotate in opposite directions. The two crushing rollers 22 further crush the powder falling from the discharge hole 26, and the crushed powder falls into the collecting bucket 1. The rotating rod 19 and the stirring rod 20 rotate synchronously under the drive of the transmission rod 10, and the stirring rod 20 is used to stir the powder evenly.

[0042] A method for producing spray coating from used iron ladle waste bricks, comprising the following steps:

[0043] Step (1): Collect the waste bricks from the dismantled molten iron tank and remove the residual iron and debris;

[0044] Step (2): crushing the waste iron ladle bricks into 3-1 and 1-0 particle sizes using a crushing device to obtain waste iron ladle brick powder, which is bagged for later use;

[0045] Step (3): add 70-80 parts of iron molten ladle waste brick powder, 15-20 parts of alumina powder, 2-6 parts of ball clay, 1 part of sodium bentonite, 2-6 parts of 625 alumina cement, 1-2 parts of silica fume, 0.5-1 parts of carboxymethyl cellulose, and 0.1-0.15 parts of sodium hexametaphosphate into a mixer, mix for 6-8 minutes, discharge the material, bag it, and store it.

[0046] The method of the present invention is used to produce a molten iron tank mouth spray coating material produced by using used molten iron tank waste bricks according to the production formula (Table 1).

[0047] Table 1:

[0048]

[0049]

[0050] Product inspection indicators (see Table 2)

[0051] Table 2:

[0052]

[0053] From the analysis of the experimental results, the test results of the three experimental schemes are equivalent to a certain product currently in use. From the test results, it can be seen that appropriately reducing the amount of cement and clay added to the spray coating can achieve the effect of producing sintering strength in the use temperature environment. Considering the comprehensive cost and use environment, Scheme 2 is adopted as the production scheme.

[0054] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A method for producing spray coating from used iron ladle waste bricks, characterized in that: The following steps are involved: Step (1): Collect the waste bricks from the dismantled molten iron tank and remove the residual iron and debris; Step (2): crushing the waste iron ladle bricks into 3-1 and 1-0 particle sizes using a crushing device to obtain waste iron ladle brick powder, which is bagged for later use; Step (3): add 70-80 parts of iron molten ladle waste brick powder, 15-20 parts of alumina powder or gem powder, 2-6 parts of ball clay, 1 part of sodium bentonite, 2-6 parts of 625 alumina cement or 70 cement, 1-2 parts of silica fume, 0.5-1 part of carboxymethyl cellulose, and 0.1-0.15 parts of sodium hexametaphosphate into a mixer, mix for 6-8 minutes, discharge the material, bag it, and store it.

2. The method for producing spray coating material from used iron ladle waste bricks according to claim 1, characterized in that: The used iron ladle waste brick powder comprises 62-65wt% Al2O3, 2.5-3.5wt% Fe2O3, 2.5-3.0wt% CaO, 12-15wt% SiO2, 6-9wt% SiC and 8-10wt% C.

3. The method for producing spray coating material from used iron ladle waste bricks according to claim 1, characterized in that: The used iron ladle waste brick powder has a mass ratio of 3-1 mm component and 1-0 mm component of 40-50:25-35.

4. The method for producing spray coating material from used iron ladle waste bricks according to claim 1, characterized in that: The alumina powder comprises Al2O3≥84.5wt%, Fe2O3≤2.0wt%, CaO≤0.45wt%, SiO2≤7.5wt%, K2O+Na2O≤0.4wt%, and loss on ignition≤0.25wt%; the gem powder comprises Al2O3≥44wt%, Fe2O3≤1.7wt%, CaO≤0.4wt%, SiO2≥50wt%, K2O+Na2O≤0.3wt%, and loss on ignition≤0.

5. The method for producing spray coating material from used iron ladle waste bricks according to claim 1, characterized in that: The alumina powder or gem powder has a particle size of 325 mesh, and the silica fume is 92 silica fume.

6. A crushing device for producing spray coating material using the used iron ladle waste bricks according to claim 1, characterized in that: The invention comprises a collecting bucket (1), a connecting block (14) being fixed to the side wall of the collecting bucket (1), a fixing seat (3) being connected to the top of one side of the connecting block (14), a discharge hole (26) being arranged in the middle of the fixing seat (3), and a conical groove being arranged on the upper end surface of the fixing seat (3), a support rod (12) being connected to the top of the fixing seat (3), an L-shaped support plate (8) being fixed to the upper end surface of the support rod (12), a driving mechanism being installed on one side of the vertical section of the L-shaped support plate (8), a primary crushing assembly connected to the driving mechanism being installed on the lower end surface of the horizontal section of the L-shaped support plate (8), a secondary crushing assembly connected to the driving mechanism being installed on the lower end surface of the fixing seat (3), and a stirring assembly being connected to the driving mechanism, three supporting legs (2) being welded at equal distances on the bottom outer wall of the collecting bucket (1), and a discharge valve (18) being arranged in the middle of the bottom end of the collecting bucket (1).

7. The crushing device according to claim 6, characterized in that: The driving mechanism comprises a servo motor (13) mounted on the top of one side of the vertical section of the L-shaped support plate (8); the output end of the servo motor (13) is connected to a transmission rod (10); a first pulley (9) is fixedly sleeved on the top of the outer wall of the transmission rod (10); and a first bevel gear (11) is fixedly sleeved on the bottom of the outer wall of the transmission rod (10).

8. The crushing device according to claim 7, characterized in that: The primary crushing assembly comprises a support plate (5) fixed on one side of the vertical section of the L-shaped support plate (8); a hydraulic push rod (15) is installed on the lower end surface of the horizontal section of the L-shaped support plate (8); the bottom end of the hydraulic push rod (15) is connected to a rotating seat (16); the lower end of the rotating seat (16) is connected to a spline rod (6); the outer portion of the spline rod (6) is slidably sleeved with a spline sleeve (25); the spline sleeve (25) slides through the support plate (5); the outer wall of the spline sleeve (25) and located above the support plate (5) is fixedly sleeved with a second pulley (30), a transmission belt (7) is connected between the first pulley (9) and the second pulley (30), five support wheels (28) are installed at equal distances on the side of the lower end surface of the second pulley (30), an annular limiting groove (29) is opened on the support plate (5) and located on the outer side of the spline sleeve (25), and the five support wheels (28) are all rollingly engaged in the annular limiting groove (29), and the bottom end of the spline rod (6) is connected to a crushing cone (4), and crushing teeth (27) are arranged at equal distances on the inclined surface of the crushing cone (4).

9. The crushing device according to claim 7, characterized in that: The secondary crushing assembly comprises two end plates (21) symmetrically fixed on the lower end surface of the fixed seat (3); two crushing rollers (22) are rotatably mounted between the two end plates (21) via bearings; one end of each crushing roller (22) is mounted with a transmission gear (23); the two transmission gears (23) are meshed with each other; the other end of one of the crushing rollers (22) is connected to a connecting rod (17); one end of the connecting rod (17) is connected to a second bevel gear (24); and the first bevel gear (11) and the second bevel gear (24) are meshed with each other.

10. The crushing device according to claim 9, characterized in that: The stirring assembly comprises a rotating rod (19) connected to the bottom end of the transmission rod (10), and a stirring rod (20) is fixed to the bottom outer wall of the rotating rod (19).

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