CN112941268A - Production process of crack-free long-life composite desulfurization powder gun and powder gun structure - Google Patents
Production process of crack-free long-life composite desulfurization powder gun and powder gun structure Download PDFInfo
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- C04B35/10—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on aluminium oxide
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- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/34—Non-metal oxides, non-metal mixed oxides, or salts thereof that form the non-metal oxides upon heating, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
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- C04B2235/5236—Zirconia
Abstract
A production process and a powder gun structure of a crack-free long-life composite desulfurization powder gun are disclosed, wherein the production process comprises the following steps: assembling and welding a steel structural member, and welding a spring positioning plate on an outer-layer square tube of the steel structural member; coating polyurethane on the surface of the outer layer square tube of the steel structural member; sequentially sleeving a spring and a spring baffle on a steel structural member from the lower part of the steel structural member, sleeving a refractory machine pressed brick on the steel structural member, installing a prefabricated gun head on the end part of the steel structural member, and smearing high-strength cement paste between the refractory machine pressed brick and between the refractory machine pressed brick and the prefabricated gun head for sealing; the self-flowing castable is injected through a grouting opening on the refractory machine pressed brick provided with the grouting opening. The invention relates to a novel design of a composite desulfurization powder gun scheme and a manufacturing process, aiming at improving the transverse crack condition of a desulfurization spray gun in the use process, aiming at different use conditions of different positions, adopting a composite scheme, pertinently improving the use effect, reducing the cost and shortening the manufacturing period.
Description
Technical Field
The invention relates to the technical field of desulfurization equipment and materials in molten iron pretreatment, in particular to a production process of a crack-free long-life composite desulfurization powder gun and a powder gun structure.
Background
The content of sulfur in steel directly influences the service performance of steel, and the external desulfurization technology is an important means for modern steel smelting. The desulfurizing spray gun is an important component of molten iron pre-desulfurizing equipment. The working principle is that a desulfurizing agent such as passivated lime powder, passivated magnesium powder and the like is blown into a ladle by a desulfurizing spray gun by taking high-pressure inert gas argon or nitrogen as a carrier, so that molten iron is stirred violently, and the aim of pre-desulfurizing the molten iron is fulfilled.
In the molten iron desulphurization process, as the desulphurization gun is repeatedly and intermittently used, the desulphurization gun has to bear high temperature, the scouring of molten iron and molten slag, chemical erosion and thermal shock damage; the appearance of its damage is: the surface of the gun body has large longitudinal cracks and transverse cracks, the slag line part is corroded and broken, and the gun head is damaged; the specific damage mechanism is expressed as follows:
1. the abrasion of high-pressure stirring and repeated cold and hot alternate treatment cause transverse crack, longitudinal crack and spalling of the casting material. In the desulfurization process, the high-pressure gas drives the molten iron to stir, so that the amplitude fluctuation of the desulfurization gun body is large, more transverse cracks appear in the castable of the desulfurization gun, the cracks where the cracks appear continue to extend and expand, and the castable is peeled off under the scouring of the molten iron; the cracks are larger and larger along with the use, and finally the castable peels off and falls off, especially after the castable is easy to be damaged by thermal shock to generate cracks during intermittent use or generate cracks during baking, the cracks are increased by the invasion of steel slag and the scouring of molten iron to cause more serious peeling and falling off, and even a gun head is fused.
2. Is corroded and damaged due to chemical reaction between the casting material and the flux. The castable is easy to react with Fe in molten slag in the using process2O3The low-melting substances are generated by the reaction, so that the castable is usedThe melting loss in the process is larger as the casting material is closer to a slag line, and the casting material is easy to be damaged by the scouring of molten iron after cracks are generated or low-melting substances are generated.
3. The pouring material is cracked and the crack is diffused to be damaged due to the expansion of the metal pipe, which is one of the most important damage factors generated in the using process. In the using process, the gun body is rapidly heated by high-temperature metal, and the carrier gas and the desulfurizer flowing at high speed in the gun core tube cool the gun body in a convection cooling mode. Under the combined action of heating and cooling, the temperature distribution condition of the gun body is gradually changed from normal-temperature uniform distribution to continuous reduction from outside to inside, and along with the extension of the blowing soaking time, the temperature of the outer side of the refractory material pouring layer of the gun body continuously and rapidly rises due to the heating of high-temperature molten iron, the core part of the gun body is subjected to convection cooling of air-carrying agent and desulfurizer in the main pipe, and the temperature rising speed is relatively slow, so that the temperature difference between the inside and the outside of the gun body is continuously increased; after the desulfurization gun is used, the surface temperature of the castable is reduced, the temperature of the inner metal pipe does not decrease or even tends to increase, so that the expansibility between the metal pipe and the anchoring piece and the castable deviates, and the thermal expansibility between the castable and the metal pipe is greatly different, so that the castable cracks, damages are caused, and the service life of the desulfurization gun is limited finally.
In the actual production process of the desulfurization spray gun, the overall length of the desulfurization spray gun is about 8-10 m generally, vertical pouring is usually adopted during pouring, and due to the length limitation of the desulfurization spray gun, a factory building which is high enough and wide enough space is required on the pouring site of refractory materials. In the process of carrying and hoisting, the castable is required to have enough normal temperature strength, and because links such as pouring construction, curing, drying and the like are often controlled by temperature environment change, the control is difficult, and the castable is limited by factors such as water adding amount, stirring time, vibration effect of a motor and the like during pouring construction; the cast desulfurization lances also require long curing times, thus severely delaying the production cycle of the desulfurization lances.
Based on the defects and problems of the cast desulfurization spray gun during production and use, a novel desulfurization spray gun and a manufacturing method thereof are urgently needed, so that transverse cracks and longitudinal cracks of a gun body castable are reduced to the maximum extent, the production process is simplified, the production period is shortened, and the manufacturing difficulty is reduced.
Disclosure of Invention
The invention aims to provide a production process of a crack-free long-life combined type desulfurization powder spray gun and a powder spray gun structure.
The invention relates to a novel design of a composite desulfurization powder gun scheme and a manufacturing process, aiming at improving the transverse crack condition of a desulfurization spray gun in the use process, aiming at different use conditions of different positions of the desulfurization spray gun, adopting a composite scheme, pertinently improving the use effect, reducing the cost and simultaneously shortening the manufacturing period.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production process of a crack-free long-life composite desulfurization powder gun comprises the following steps:
1) assembling and welding a steel structural member, and welding a spring positioning plate on an outer-layer square tube of the steel structural member;
2) coating polyurethane on the surface of an outer layer square tube of the steel structural member, wherein the thickness is not less than 2 mm;
3) sequentially sleeving a spring and a spring baffle on a steel structural member from the lower part of the steel structural member, sleeving a refractory machine press brick on the steel structural member and butting the refractory machine press brick with the spring baffle, smearing high-strength cement between the refractory machine press brick and the refractory machine press brick for sealing, and finally installing a prefabricated gun head at the end part of the steel structural member, wherein the refractory machine press brick and the prefabricated gun head are bonded by adopting the high-strength cement;
4) the self-flowing castable is injected through a grouting opening on the refractory machine pressed brick provided with the grouting opening.
The refractory machine-pressed brick at the slag line part in the refractory machine-pressed brick is prepared from the following raw materials in parts by weight: 15-25 parts of alumina with the granularity of 5-3mm, 15-25 parts of alumina with the granularity of 3-1mm, 5-10 parts of brown corundum with the granularity of 3-1mm, 10-20 parts of brown corundum with the granularity of 1-0mm, 5-10 parts of silicon carbide with the granularity of 1-0mm, 2.8-3.0 parts of thermoplastic resin, -195 graphite 8-13 parts, 0.5-2 parts of metal aluminum powder with the granularity of 200 meshes, 3-8 parts of silicon carbide with the granularity of 200 meshes, 8-15 parts of brown corundum with the granularity of 200 meshes and 0.2-0.4 part of urotropine.
The refractory machine-pressed brick at the non-slag line part in the refractory machine-pressed brick is prepared from the following raw materials in parts by weight: 10-20 parts of alumina with the granularity of 5-3mm, 20-30 parts of alumina with the granularity of 3-1mm, 20-30 parts of alumina with the granularity of 1-0mm, 2.8-3.0 parts of thermoplastic resin, 8-15 parts of-194 graphite, 1-3 parts of metal aluminum powder with 200 meshes, 8-15 parts of silicon carbide with 200 meshes, 8-15 parts of brown corundum with 200 meshes and 0.2-0.4 part of urotropine.
The precast piece castable of the precast gun head is prepared from the following raw materials in parts by weight: 20-30 parts of fused mullite with the granularity of 5-10mm, 10-20 parts of fused mullite with the granularity of 3-6mm, 10-15 parts of flint clay with the granularity of 1-3mm, 10-20 parts of flint clay with the granularity of 0-1mm, 3-6 parts of active alumina micro powder with the granularity of 5 mu m, 3-8 parts of pure calcium aluminate cement, 5-8 parts of silicon carbide with the granularity of 200 meshes, 4-8 parts of kyanite with the granularity of 40 meshes, 3-5 parts of white corundum with the granularity of 240 meshes, 0.5-0.8 part of a high-efficiency water reducing agent and 0.08-0.12 part of zirconia fiber.
The utility model provides an adopt spray gun structure of production technology production of crackle-free long-life combined type desulfurization spray gun, includes steel structure, spring pressure device, prefabricated rifle head, resistant material machine pressure brick suit is in the outside of steel structure, the bottom at steel structure is installed to the prefabricated rifle head, spring pressure device sets up the upper end at resistant material machine pressure brick, makes resistant material machine pressure brick and prefabricated rifle head compress tightly sealed it has the pouring material layer that flows automatically to fill between resistant material machine pressure brick and the steel structure.
The steel structure includes inlayer pipe, outer side's pipe, the inlayer pipe sets up in outer side's pipe the outer wall surface of outer side's pipe is paintd the polyurethane layer.
The spring pressure device comprises a spring positioning plate, a spring and a spring baffle, the spring positioning plate is fixedly connected with the steel structural member, the spring is sleeved outside the steel structural member and below the spring positioning plate, and the spring baffle is arranged at the bottom of the spring and is in sliding sleeve connection with the steel structural member.
The refractory machine pressing bricks are sealed by inserting the annular grooves and the annular bulges, and the refractory machine pressing bricks and the prefabricated gun head are sealed by inserting the annular grooves and the annular bulges.
And grouting ports are arranged on the refractory machine pressing bricks.
The prefabricated gun head comprises a steel nozzle and a prefabricated casting material, the prefabricated casting material is wrapped outside the steel nozzle, and the steel nozzle is connected with a steel structural member through threads.
Compared with the prior art, the invention has the beneficial effects that:
1) the refractory material of the gun body is assembled in a mechanical pressing brick mode for the first time. Compared with the traditional pouring desulfurization spray gun, the anti-corrosion and anti-scouring capability is stronger; compared with the traditional casting desulfurization spray gun, the steel structure has larger difference in thermal expansion coefficient with the traditional casting refractory due to the adoption of an assembly form, and although certain raw materials such as kyanite and andalusite are usually added into the casting material to increase the thermal expansion coefficient, the actual use process is always satisfactory, transverse cracks generated by internal stress release can be generated more or less, and the service life of the spray gun is further influenced. The invention effectively avoids cracks and expansion generated by internal stress release through split type assembly, relieves the cracks and the expansion through the spring pressure device, effectively solves the problems of crack generation and expansion, and releases stress damage energy brought in the thermal shock process through the spring pressure device. Taking 240 tons of hot metal ladles in four parts of a certain large steel mill in northeast as an example, the average service life of the original casting desulfurization spray gun is 26 times, and the proportion of the desulfurization spray gun which is off-line due to overlarge horizontal and longitudinal cracks is 38.46 percent; the average life of the desulfurization spray gun manufactured by the invention is 41 times, but the desulfurization spray gun which is off-line due to the transverse crack and the longitudinal crack is almost not.
2) The production is efficient. The traditional desulfurization spray gun adopts a vertical pouring method, and because the length of the pouring material is too long, the pouring is assisted by devices such as a vibrating motor vibrating rod and the like, the pouring quality is difficult to guarantee, and the production period is long. Most of the invention adopts machine-pressed bricks, the brick shapes are fixed, the production is efficient and convenient, only assembly is needed, the production period is greatly shortened, the production period of the cast desulfurization spray gun is about 20 days generally, and the invention only needs 7 days.
3) The height limit of the factory building is effectively released, and high-altitude operation is avoided. The traditional desulfurization spray gun adopts a vertical pouring method, and the overall length of the desulfurization spray gun is generally about 8-10 meters, a high-rise factory building is needed, and high-altitude operation is needed; the invention only needs to be produced and assembled on the ground, thereby being safer to operate.
4) The structural part at the nozzle is fixed by a plurality of rib plates, so that each pipe of the structure is stressed by 360 degrees, and the structure is more stable in the using process.
5) The steel structural member can be repeatedly used. The off-line desulfurization spray gun is usually dismantled by adopting an air pick; the steel structure can be disassembled only by opening the spring pressing device, so that the labor intensity of workers is greatly reduced, the disassembled steel structure can be repeatedly utilized, and the aims of saving cost and protecting environment are fulfilled.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a crack-free long-life compound desulfurization powder gun of the invention.
Fig. 2 is a schematic structural view of a steel structural member and a spring pressure device.
Fig. 3 is a schematic view of an assembly structure of the refractory machine pressing brick and the prefabricated gun head.
Fig. 4 is an enlarged view of the structure of the preformed lance tip.
Fig. 5 is a schematic structural view of a steel nozzle.
Figure 6 is a top view of a refractory machine pressed brick.
Fig. 7 is a top view of a refractory machine pressed brick provided with a grout injection port.
FIG. 8 is a flow chart of the production process of the present invention.
In the figure: 1. an outer layer square tube; 2. an inner layer circular tube; 3. a spring positioning plate; 4. a spring baffle; 5. a spring; 6. pressing bricks by a refractory machine; 7. high-strength daub; 8. a self-flowing castable layer; 9. prefabricating a gun head; 9-1 steel nozzle; 9-2 of a pull rib plate; 9-3, casting a prefabricated part; 10. refractory machine pressed bricks with grouting ports; 10-1 grouting port.
Detailed Description
The following further illustrates embodiments of the invention:
as shown in fig. 1-8, a production process of a crack-free long-life compound desulfurization powder gun comprises the following steps:
1) and assembling and welding the steel structural member, and welding and fixing the spring positioning plate 3 on the outer-layer square tube of the steel structural member.
The desulfurization spray gun steel structure spare takes double-deck steel construction design, and bottom welded fastening between two pipes is managed 2 in inlayer pipe, outer side, and the top is welded fastening not for the flexible of adaptation temperature variation production, will guarantee outer side's pipe 1, the coincidence of 2 central lines of inlayer pipe.
2) Coating polyurethane on the surface of the outer layer square tube 1 of the steel structural member, wherein the thickness is not less than 2 mm; the aim is to prevent the high-alumina self-flowing material from directly contacting with a steel structural member, and the polyurethane is melted at high temperature and disappears, so that a gap is reserved between the steel structural member and the material, and a space is reserved for high-temperature expansion of the steel structure.
3) The spring 5 and the spring baffle plate 4 are sequentially sleeved on the steel structural member from the lower part of the steel structural member, the spring 5 is connected with the spring positioning plate 3 in a jacking mode, the refractory machine pressing brick 6 is sleeved on the steel structural member and connected with the spring baffle plate 4 in a jacking mode, high-strength cement gum 7 is smeared between the refractory machine pressing brick 6 and the refractory machine pressing brick 6 for sealing, the prefabricated gun head 9 is installed at the end part of the steel structural member, and the refractory machine pressing brick 6 and the prefabricated gun head 9 are bonded through the high-strength cement gum 7.
The welding of the spring positioning plate 3 in the step 1) can adopt spot welding for temporary fixation, when the spring pressure device is adjusted, the spring positioning plate 3 can be fixed in a resetting mode after being detached for adjusting the spring pressure device, and after the whole body is locked, the gap of each part is guaranteed to be smaller than 2 mm.
4) The self-flowing casting material is injected through a grouting opening 10-1 on the refractory machine pressing brick 10 provided with a grouting opening, so that the inner gap is filled. The self-flow castable is high-alumina self-flow castable.
The refractory machine-pressed brick at the slag line part in the refractory machine-pressed brick 6 is prepared from the following raw materials in parts by weight: 15-25 parts of 88 alumina with the granularity of 5-3mm, 15-25 parts of 88 alumina with the granularity of 3-1mm, 5-10 parts of brown corundum with the granularity of 3-1mm, 10-20 parts of brown corundum with the granularity of 1-0mm, 5-10 parts of silicon carbide with the granularity of 1-0mm, 2.8-3.0 parts of thermoplastic resin, -195 graphite 8-13 parts, 0.5-2 parts of metal aluminum powder with the granularity of 200 meshes, 3-8 parts of silicon carbide with the granularity of 200 meshes, 8-15 parts of brown corundum with the granularity of 200 meshes and 0.2-0.4 part of urotropine.
The refractory machine-pressed brick at the non-slag line part in the refractory machine-pressed brick 6 is prepared from the following raw materials in parts by weight: 10-20 parts of 88 alumina with the granularity of 5-3mm, 20-30 parts of 88 alumina with the granularity of 3-1mm, 20-30 parts of 88 alumina with the granularity of 1-0mm, 2.8-3.0 parts of thermoplastic resin, -8-15 parts of 194 graphite, 1-3 parts of 200 meshes of metal aluminum powder, 8-15 parts of 200 meshes of silicon carbide, 8-15 parts of 200 meshes of brown corundum and 0.2-0.4 part of urotropine.
The precast piece castable 9-3 of the precast gun head is prepared from the following raw materials in parts by weight: 20-30 parts of fused mullite with the granularity of 5-10mm, 10-20 parts of fused mullite with the granularity of 3-6mm, 10-15 parts of flint clay with the granularity of 1-3mm, 10-20 parts of flint clay with the granularity of 0-1mm, 3-6 parts of active alumina micro powder with the granularity of 5 mu m, 3-8 parts of pure calcium aluminate cement, 5-8 parts of 95 silicon carbide with the granularity of 200 meshes, 4-8 parts of kyanite with the granularity of 40 meshes, 3-5 parts of white corundum with the granularity of 240 meshes, 0.5-0.8 part of a high-efficiency water reducing agent and 0.08-0.12 part of zirconia fiber.
Referring to fig. 1-7, the powder gun structure produced by adopting the production process of the crack-free long-life composite desulfurization powder gun comprises a steel structural member, a spring pressure device, a prefabricated gun head 9 and a refractory machine pressed brick 6, wherein the refractory machine pressed brick 6 is sleeved outside the steel structural member, the prefabricated gun head 9 is installed at the bottom of the steel structural member, the spring pressure device is arranged at the upper end of the refractory machine pressed brick 6, so that the refractory machine pressed brick 6 and the prefabricated gun head 9 are pressed and sealed, and a self-flowing castable layer 8 is filled between the refractory machine pressed brick 6 and the steel structural member.
The steel structure includes inlayer pipe 2, outer side pipe 1, inlayer pipe 2 sets up in outer side pipe 1 the outer wall surface of outer side pipe 1 has scribbled the polyurethane layer.
Spring pressure device includes spring location board 3, spring 5, spring baffle 4, spring location board 3 and steel structure fixed connection, spring 5 cup joints outside the steel structure, under spring location board 3, spring baffle 4 sets up in the bottom of spring 5 and cup joints with the steel structure slip.
The refractory machine pressing bricks 6 are sealed by inserting the annular grooves and the annular bulges, and the refractory machine pressing bricks 6 and the prefabricated gun heads 9 are sealed by inserting the annular grooves and the annular bulges.
And grouting ports 10-1 are arranged on a plurality of refractory machine pressed bricks. In fig. 1, the bottom refractory press brick is a refractory press brick 10 provided with a grouting opening.
The prefabricated gun head 9 comprises a steel nozzle 9-1 and a prefabricated casting material 9-3, the prefabricated casting material 9-3 is wrapped outside the steel nozzle 9-1, and the steel nozzle 9-1 is connected with a steel structural member through threads.
According to the position of the desulfurization spray gun in molten iron, the invention pertinently adopts refractory materials with different materials and manufacturing processes: the refractory material at the nozzle of the desulfurization spray gun is in a prefabricated part form, the castable mainly takes mullite-flint clay as a main material, is combined with low cement, is compounded with various micro powder and fibers, and has high strength, scouring resistance and high-temperature micro expansion; the refractory material of the gun body part adopts a mechanical pressing brick form, wherein the refractory material of the mechanical pressing brick at the slag line part is Al-SiC-C with excellent slag resistance, the refractory material of the mechanical pressing brick at the other part adopts Al-C, and the bricks are bonded by high-strength daub.
The water adding amount of the castable formula for the prefabricated gun head of the desulfurization spray gun is 3.5-5.5 wt%; the drying compressive strength can reach more than 20MPa at 110 ℃ for 24 h; the peeling phenomenon does not occur after the thermal vibration for 20 times at 1100 ℃, and the residual compressive strength can reach more than 5 MPa. The formula composition can greatly improve the high-temperature strength, reduce the heat conductivity coefficient of the refractory material, improve the anti-oxidation performance of the refractory material and improve the scouring resistance of the refractory material in molten steel.
The hole pattern of the nozzle can adopt various hole patterns of Y-shaped, T-shaped, three-hole, four-hole and the like, and the invention adopts a mode of welding a plurality of pull rib plates 9-2 for fixing aiming at each round pipe of a structural member at the position of the nozzle. In the embodiment, three-hole powder spraying is taken as an example for illustration, an included angle between each steel pipe is 120 degrees, and a plurality of rib plates 9-2 are fixed around each pipe, so that each pipe of the structure can be stressed at 360 degrees; the three-hole distribution can ensure that the desulfurizer is uniformly sprayed out in three directions, so that the desulfurization gun body is uniformly stressed in all directions, thereby reducing the shaking of the desulfurization gun in the use process and the occurrence of the phenomena of desulfurization transverse cracking and gun bending.
The volume density of the refractory machine pressed brick at the slag line part can reach 3.0g/cm3The normal temperature compressive strength can reach more than 50Mpa, and the high temperature rupture strength is more than 5 Mpa. The formula has good slag corrosion resistance and thermal shock resistance.
The volume density of the refractory machine pressed bricks at other parts can reach 2.8g/cm3The normal temperature compressive strength can reach more than 45Mpa, and the high temperature rupture strength is more than 5 Mpa. The formula has good high-temperature strength and thermal shock property.
Example 1:
taking 240 tons of hot metal ladles in four parts of a certain large steel mill in northeast as an example, the invention specifically provides a crack-free long-life composite desulfurization powder gun and a production process thereof.
Since the desulfurization gun desulfurization process of the four-branch plant of the steel mill is put into production and used formally, the service life is long and the process is not stable all the time for more than 20 years, and particularly in recent years, because the content of S, N in molten iron is high, the desulfurization time is obviously increased, and the addition proportion of a desulfurizing agent is also obviously increased. Therefore, the proportion of abnormal off-line of the desulfurization spray gun, such as slag line corrosion fracture, gun head damage and the like, is gradually increased due to horizontal and longitudinal cracks.
Based on long-term observation and a large number of tests, the invention improves the traditional cast type desulfurization spray gun as follows:
1. the production mode of directly pouring the steel structural member and the castable is changed, a split assembly mode is adopted, the gun head is in a prefabricated member mode, the desulfurization spray gun is assembled in a gun body pressing brick mode, and the bricks are bonded with the bricks and the prefabricated member by high-strength cement paste. The desulfurizing gun used in the steel mill has a total length of 9 m, wherein the total length of the refractory part is 5m, and the outer diameter is 280 mm. The gun head prefabricated part 9 used in the invention is positioned at the bottommost part of the desulfurization gun, the total height is 500mm, the external diameter of the refractory material is 280mm, and the internal steel structural part and the upper steel structural part are connected by adopting pipe threads. The refractory machine-pressed brick 6 used in the invention is 300mm in height and 280mm in external diameter, and consists of 15 machine-pressed bricks, wherein the 11 th to 14 th bricks are slag line parts from bottom to top, and the 3 rd and 15 th bricks are refractory machine-pressed bricks 10 provided with grouting ports.
Wherein, the compositions of the refractory castable of the gun head prefabricated part 9 part are shown in table 1, and the water adding amount in the formula production of the castable is 4.5-4.8 wt%; the drying compressive strength is about 26MPa at 110 ℃ for 24 h; the peeling phenomenon does not occur after the thermal vibration for 20 times at 1100 ℃, and the residual compressive strength is about 6 MPa. Compared with the common desulfurization spray gun castable, the formula has the advantages that the high-temperature strength is improved, the heat conductivity coefficient of the refractory is reduced, the oxidation resistance of the refractory is improved, and the scouring resistance of the refractory in molten steel is improved. The nozzle of the gun head adopts three holes for spraying powder, the included angle between each steel pipe is 120 degrees, and a plurality of rib plates 9-2 are fixed around each pipe, so that each pipe of the structure is stressed at 360 degrees; the three-hole distribution can ensure that the desulfurizer is uniformly sprayed out in three directions, so that the desulfurization gun body is uniformly stressed in all directions, thereby reducing the shaking of the desulfurization gun in the use process and the occurrence of the phenomena of desulfurization transverse cracking and gun bending. The prefabricated member is prepared from materials on site and then cast for curing, and the whole process can be finished in 6 days.
Table 1: example 1 gun head prefabricated part refractory castable formula
The refractory machine pressed brick of the slag line part has the formula composition shown in table 2: the volume density of the machine-pressed brick formed by the modified formula is 3.1g/cm3The normal temperature compressive strength is 56Mpa, and the high temperature bending strength is 6.8 Mpa. The formula has good slag corrosion resistance and thermal shock resistance.
Table 2: example 1 refractory machine-pressed brick formulation for slag line section
The refractory machine pressed bricks at other parts adopt Al-C materials, and the formula composition is shown in a table 3: the volume density of the product can reach 2.8g/cm3The normal temperature compressive strength can reach more than 45Mpa, and the high temperature rupture strength is more than 5 Mpa. The formula has good high-temperature strength and thermal shock property.
Table 3: example 1 refractory machine-pressed brick formulation for non-slag line part
The production of the mechanical pressed brick can be completed in a production cycle of only 3 days from the batching to the stirring and pressing and then the drying.
2. Polyurethane is smeared on the surface of the outer layer square tube 1, the thickness is larger than 2mm, the purpose is to prevent direct contact between high-aluminum self-flowing materials and steel structural members, the polyurethane is melted at high temperature and disappears, so that gaps are reserved between the steel structural members and the materials, and spaces are reserved for high-temperature expansion of the steel structure.
3. The refractory materials assembled on all parts are pressed through the spring pressure device, so that the problems of crack generation and crack expansion are effectively solved, the energy of stress damage caused in the thermal shock process is released through the spring pressure device, and cracks and crack expansion caused by internal stress release are effectively avoided.
The implementation effect is as follows:
1. the production period is greatly shortened, the production period of the cast type desulfurization spray gun is about 20 days generally, all parts of the desulfurization spray gun can be synchronously manufactured, most of the desulfurization spray gun is made of machine-pressed bricks, the brick shapes are relatively fixed, the production is efficient and convenient, the desulfurization spray gun can be assembled only, and the whole process only needs 7 days. The production is efficient. The traditional desulfurization spray gun adopts a vertical pouring method, and because the length of the pouring material is too long, the pouring is assisted by devices such as a vibrating motor vibrating rod and the like, the pouring quality is difficult to guarantee, and the production period is long.
2. The abnormal off-line conditions of large longitudinal cracks and transverse cracks on the surface of the gun body, erosion and fracture of a slag line part, gun head damage, gun body bending, internal gun blockage and the like are obviously improved. During the statistics period of 3-6 months in the year, the average service life of the pouring desulfurization spray gun is 26 times, and the proportion of the desulfurization spray gun which is off-line due to overlarge horizontal and longitudinal cracks is 38.46 percent; the average life of the desulfurization spray gun manufactured by the invention is 41 times, but almost no desulfurization spray gun is off-line due to abnormal phenomena such as horizontal and longitudinal cracks.
As can be seen from the above table, through various measures, the abnormal off-line conditions of large longitudinal cracks and transverse cracks on the surface of the gun body, erosion fracture of a slag line part, damage of the gun head, bending of the gun body, internal gun blockage and the like are improved, the service life of the desulfurization gun is obviously prolonged, the increase range is 57.7 percent, and therefore, on one hand, the requirements of steel plant smelting are well met, and meanwhile, considerable benefits are created for refractory material manufacturers.
Claims (10)
1. A production process of a crack-free long-life composite desulfurization powder gun is characterized by comprising the following steps:
1) assembling and welding a steel structural member, and welding a spring positioning plate on an outer-layer square tube of the steel structural member;
2) coating polyurethane on the surface of an outer layer square tube of the steel structural member, wherein the thickness is not less than 2 mm;
3) sequentially sleeving a spring and a spring baffle on a steel structural member from the lower part of the steel structural member, sleeving a refractory machine press brick on the steel structural member and butting the refractory machine press brick with the spring baffle, smearing high-strength cement between the refractory machine press brick and the refractory machine press brick for sealing, and finally installing a prefabricated gun head at the end part of the steel structural member, wherein the refractory machine press brick and the prefabricated gun head are bonded by adopting the high-strength cement;
4) the self-flowing castable is injected through a grouting opening on the refractory machine pressed brick provided with the grouting opening.
2. The production process of the crack-free long-life composite desulfuration powder gun according to claim 1, characterized in that the refractory machine-pressed brick at the slag line part of the refractory machine-pressed brick is prepared from the following raw materials in parts by weight: 15-25 parts of alumina with the granularity of 5-3mm, 15-25 parts of alumina with the granularity of 3-1mm, 5-10 parts of brown corundum with the granularity of 3-1mm, 10-20 parts of brown corundum with the granularity of 1-0mm, 5-10 parts of silicon carbide with the granularity of 1-0mm, 2.8-3.0 parts of thermoplastic resin, -195 graphite 8-13 parts, 0.5-2 parts of metal aluminum powder with the granularity of 200 meshes, 3-8 parts of silicon carbide with the granularity of 200 meshes, 8-15 parts of brown corundum with the granularity of 200 meshes and 0.2-0.4 part of urotropine.
3. The production process of the crack-free long-life compound desulfurization powder gun according to claim 1, characterized in that the refractory machine-pressed brick at the non-slag line part of the refractory machine-pressed brick is prepared from the following raw materials in parts by weight: 10-20 parts of alumina with the granularity of 5-3mm, 20-30 parts of alumina with the granularity of 3-1mm, 20-30 parts of alumina with the granularity of 1-0mm, 2.8-3.0 parts of thermoplastic resin, 8-15 parts of-194 graphite, 1-3 parts of metal aluminum powder with 200 meshes, 8-15 parts of silicon carbide with 200 meshes, 8-15 parts of brown corundum with 200 meshes and 0.2-0.4 part of urotropine.
4. The production process of the crack-free long-life composite desulfuration powder gun according to claim 1, characterized in that the precast piece castable of the precast gun head is prepared from the following raw materials in parts by weight: 20-30 parts of fused mullite with the granularity of 5-10mm, 10-20 parts of fused mullite with the granularity of 3-6mm, 10-15 parts of flint clay with the granularity of 1-3mm, 10-20 parts of flint clay with the granularity of 0-1mm, 3-6 parts of active alumina micro powder with the granularity of 5 mu m, 3-8 parts of pure calcium aluminate cement, 5-8 parts of silicon carbide with the granularity of 200 meshes, 4-8 parts of kyanite with the granularity of 40 meshes, 3-5 parts of white corundum with the granularity of 240 meshes, 0.5-0.8 part of a high-efficiency water reducing agent and 0.08-0.12 part of zirconia fiber.
5. A powder gun structure produced by adopting the production process of the crack-free long-life compound type desulfurization powder gun according to claim 1, is characterized by comprising a steel structural part, a spring pressure device, a prefabricated gun head and a refractory machine pressing brick, wherein the refractory machine pressing brick is sleeved outside the steel structural part, the prefabricated gun head is installed at the bottom of the steel structural part, the spring pressure device is arranged at the upper end of the refractory machine pressing brick to enable the refractory machine pressing brick and the prefabricated gun head to be pressed and sealed, and a self-flowing castable layer is filled between the refractory machine pressing brick and the steel structural part.
6. The powder gun structure produced by adopting the production process of the crack-free long-life compound desulfurization powder gun as claimed in claim 5, wherein the steel structural member comprises an inner circular tube and an outer square tube, the inner circular tube is arranged in the outer square tube, and a polyurethane layer is coated on the outer wall surface of the outer square tube.
7. The powder gun structure produced by adopting the production process of the crack-free long-life compound desulfurization powder gun as claimed in claim 5, wherein the spring pressure device comprises a spring positioning plate, a spring and a spring baffle plate, the spring positioning plate is fixedly connected with the steel structural member, the spring is sleeved outside the steel structural member and below the spring positioning plate, and the spring baffle plate is arranged at the bottom of the spring and is slidably sleeved with the steel structural member.
8. The powder gun structure produced by adopting the production process of the crack-free long-life compound desulfurization powder gun according to claim 5, wherein the refractory machine pressed bricks are sealed by inserting through annular grooves and protrusions, and the refractory machine pressed bricks are sealed by inserting through annular grooves and protrusions with the prefabricated gun head.
9. The powder gun structure produced by the production process of the crack-free long-life compound desulfurization powder gun according to claim 8, wherein a plurality of the refractory machine-pressed bricks are provided with grouting ports.
10. The powder gun structure produced by adopting the production process of the crack-free long-life compound desulfurization powder gun according to claim 5, wherein the prefabricated gun head comprises a steel nozzle and a prefabricated casting material, the prefabricated casting material is wrapped outside the steel nozzle, and the steel nozzle is connected with a steel structural member through threads.
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| CN114105656A (en) * | 2021-11-25 | 2022-03-01 | 吴丽贤 | Production method of novel roasting-sintering desulfurization gun with high-temperature adhesive |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114105656A (en) * | 2021-11-25 | 2022-03-01 | 吴丽贤 | Production method of novel roasting-sintering desulfurization gun with high-temperature adhesive |
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