CN115648388A - Pumping pouring method of high-steel fiber castable - Google Patents
Pumping pouring method of high-steel fiber castable Download PDFInfo
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- CN115648388A CN115648388A CN202211702162.0A CN202211702162A CN115648388A CN 115648388 A CN115648388 A CN 115648388A CN 202211702162 A CN202211702162 A CN 202211702162A CN 115648388 A CN115648388 A CN 115648388A
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Abstract
The invention relates to the technical field of blast furnace lining pouring, in particular to a pumping pouring method of a high steel fiber pouring material. The pumping pouring method adopts a layered and step-by-step high steel fiber castable construction mode, can realize the pumping pouring construction of the high steel fiber material, greatly shortens the construction period, improves the construction efficiency, simultaneously can ensure that the service life of the manufactured lining is longer, realizes the high efficiency and the high quality of the pumping of the high steel fiber castable, and improves the application efficiency of the steel fiber.
Description
Technical Field
The invention relates to the technical field of blast furnace lining pouring, in particular to a pumping pouring method of a high steel fiber pouring material.
Background
The blast furnace lining manufacturing mainly comprises the following modes: masonry brick lining, semi-dry or wet injection, pumping casting and cooling wall casting.
The construction period of the brick lining is long, the brick lining is not suitable for overhauling the blast furnace, and the service life of the brick lining is influenced by the operation of the blast furnace. Semi-dry or wet injection works for shorter periods, but the resulting liners also have shorter lifetimes. The pumping casting has short construction period and is suitable for blast furnace maintenance, but the lining made of common pumping casting materials has the problems of surface cracks, thermal expansion at high temperature and the like.
The high steel fiber has high breaking strength (more than 30 MPa) and high heat conducting performance (10W/K.m), and the lining made by adopting the high fiber casting material can prolong the service life of the lining in the slag adhering area in the blast furnace to more than 3 years, and is economical and practical. However, because the castable contains steel fibers (the content is more than 20%), if the castable is pumped, the friction between the steel fibers and the pipeline can cause pipeline blockage in the pumping process, so the high-fiber castable mainly adopts a cooling wall pouring mode of firstly pouring outside the furnace and then installing in the furnace at present.
Although the prior art also discloses that a liner is manufactured by casting a high-fiber casting material in a supporting mold in a furnace, such as step five and step six in CN202010990682.0, the liner can only be cast by pumping by adopting a manual feeding mode, the construction difficulty is higher, the labor is wasted, the casting time can only be within 300mm per day on average, and compared with pumping casting, the construction period is increased by at least 5 times; in the case of a blast furnace of 10m or more, a casting period of 30 days or more is required. Therefore, the high-fiber castable is mainly used for newly building a blast furnace or replacing a cooling wall to maintain the blast furnace at present, and cannot realize online maintenance.
Disclosure of Invention
Aiming at the problem of pouring construction of high steel fiber castable, the invention provides a novel pouring method of high steel fiber castable. The method can realize the pumping and pouring mode of the high-steel fiber material, greatly shorten the construction period, improve the construction efficiency, simultaneously ensure that the service life of the manufactured lining is longer, realize the high efficiency and high quality of the pumping of the high-steel fiber castable material and improve the application efficiency of the steel fiber.
The pumping pouring method of the high steel fiber castable provided by the invention adopts a layered pouring mode, and each layer of pouring comprises three steps of pumping a base material, placing steel fibers and pressing.
The research of the invention finds that except that the high steel fiber casting material can not be poured by pumping, when a manual feeding mode is adopted, the high steel fiber casting material can only be manually fed, more than 30 workers are needed each time, and one-step mold is poured each day, the height of each pouring is not more than 300mm, in order to ensure that the steel fibers are uniformly distributed in the casting material, the stirring at a certain speed is usually needed, so that the horizontal seven-vertical eight distribution of the steel fibers in the casting material is caused, no rule exists, the compactness of a lining material is low, the heat transfer efficiency is low, the problem of the expansion top cooling wall of the lining is easy to occur, and the service life of the lining is reduced.
Therefore, based on the characteristics of the steel fibers and the pouring mode, the invention provides a construction strategy of layered pouring and the adoption of firstly pumping the matrix material for pouring, then placing and pressing the steel fibers. This construction strategy both can accomplish the online formwork pouring of high steel fiber pouring material, shorten construction period greatly, and the production efficiency is improved, can improve steel fiber additive amount and distribute in the pouring material again and have the order, put steel fiber according to same direction, improve the anti shearing capability of pouring body and anti breaking strength, and make the material maintenance process shrink crackless, blast furnace operation process thermal energy is offset by the pouring body is inside, furthest exerts its reinforcing and heat conduction effect, and be favorable to the pouring body surface to hang the sediment, and then the life of blast furnace inside lining has further been improved. In addition, only four persons are needed to be arranged for actual construction by adopting the pumping pouring method, and the four persons are respectively responsible for material pipe moving, steel fiber supplying, steel fiber placing and steel fiber pressing, so that labor and force are saved.
The pumping pouring method has extremely strong practical operability and application value, and solves the most troublesome problem in the construction of the existing high-steel fiber castable.
Further, the pumping casting method comprises the following steps:
step (1): erecting a first-step mold, pumping the matrix material into the first-step mold in a blast furnace, and pouring a first layer to form a first-layer pouring body;
step (2): placing the steel fibers on the surface of the first layer of casting body by using a placing device;
and (3): pressing the steel fibers into the first layer casting body by using a steel pestle;
and (4): after the first layer of casting body is pressed into the steel fiber along the circumferential direction, the next layer is cast;
and (5): repeating the step (2) -the step (4) until the pouring of the first-step mold is completed;
and (6): maintaining;
and (7): after the maintenance is finished, erecting a next step of mold, and repeating the step (1) to the step (6) until all the lining pouring construction is finished;
and (8): and demolding to form the cast lining.
According to the scheme, each layer of pouring comprises the steps of firstly pumping and pouring the matrix material, uniformly discharging in the pumping process, and automatically flowing the matrix material after entering the mold, so that the pouring thickness of each layer of matrix material can be determined according to the discharging time, then placing the steel fibers on the surface of the first layer of pouring body by using a placing device, the furnace burden in a blast furnace is from top to bottom, hot air is from bottom to top, and the lining is mechanically scoured and sheared stress in the vertical direction, the steel fibers placed perpendicular to the cooling wall surface of the blast furnace can improve the overall fracture resistance of the pouring body, namely the scour resistance and the shearing stress resistance, the arrangement of the steel fibers cannot be realized by using a common steel fiber pouring material, in addition, the steel fibers placed by using the placing device are more uniform, and the condition of uneven thickness does not exist. After the steel fibers are placed, the steel fibers are pressed into the casting body, and the operation can avoid the phenomenon that the steel fibers are washed away or deflected when the base materials are cast next.
Further, in the step (2), the placing device comprises a screen frame and a screen plate arranged at the bottom of the screen frame, and a plurality of screen holes are arranged on the screen plate;
in the placing process, the bottom surface of the sieve plate is attached to or close to the surface of the first layer casting body, the steel fibers are added into the sieve frame, the sieve frame is shaken from left to right, and the steel fibers penetrate through the sieve holes under the vibration condition and are placed on the surface of the first layer casting body.
In the above scheme, the placing device comprises a screen frame and a screen plate arranged at the bottom of the screen frame, and the space formed by the screen frame and the screen plate can be used for containing steel fibers. Be provided with a plurality of sieve meshes on the sieve, can put steel fiber to the casting body surface through the sieve mesh directionally. Specifically, in the placing process, the bottom surface of the sieve plate is attached to or close to the surface of the first-layer casting body, the steel fibers are added into the sieve frame, and the steel fibers penetrate through the sieve holes and are placed on the surface of the first-layer casting body under the vibration condition. The vibration can be realized through the oscillator, and the labor can be saved.
Preferably, the sieve holes are orderly and uniformly arranged in an array along the length direction and the width direction of the sieve plate. Thus being beneficial to the uniform arrangement of the steel fibers.
Further, the sieve holes are obliquely arranged in the sieve plate, and the inclination of inclination is 0.2% -0.4%, preferably 0.3%.
Understandably, the sieve holes and the sieve plate plane are obliquely arranged, and the inclination slope is limited in a reasonable range value, so that the directional arrangement of the steel fibers is facilitated, the manual operation is also facilitated, and the steel fibers are prevented from scattering in the operation process.
Further, after the placement is finished, the steel fibers are placed perpendicular to the cooling wall surface of the blast furnace.
It can be understood that the furnace charge in the blast furnace from top to bottom and the hot air from bottom to top both cause mechanical scouring and shearing stress in the vertical direction to the lining, and the steel fiber vertical to the furnace wall surface can further improve the integral fracture resistance of the casting body, namely the scouring resistance and the shearing stress resistance, and can further improve the heat conduction efficiency of the casting body.
The steel fibers scattered by the placing device are distributed uniformly and regularly, the condition of uneven thickness does not exist, and the service life of the lining is prolonged. By scattering the steel fibers embedded in the casting layer through the sieve, more than 90% of the steel fibers are kept at a position vertical or nearly vertical to the cooling wall surface, so that the flexural strength of the casting body is greatly improved, and the heat conduction efficiency of the casting body is improved. It should be noted that the steel fibers can be placed perpendicular or nearly perpendicular to the cooling wall surface by adjusting the angle of the screen plate relative to the cooling wall surface during the screening process. For steel fibers that are not perpendicular to the inner wall, they can be adjusted to a position perpendicular to the cooling wall surface by trimming.
Further, in the step (2), the steel fibers are distributed in the first layer casting body in the following manner: arranging a layer of the steel fibers every 40-60 mm along the height direction of the first layer of casting body; the distance between the steel fibers along the radial direction of the first layer casting body is 4mm-6mm; the spacing between the steel fibers along the circumferential direction of the first layer of casting is 4mm-6mm; the placing area is 0.08m each time 2 -0.1m 2 Preferably 0.09m 2 。
Understandably, the placing of the steel fibers on the first layer of casting body is reasonably arranged, so that the anti-shearing capability and the anti-breaking strength of the casting body can be effectively improved, the reinforcing and heat conducting effects of the casting body are effectively exerted, the slag is hung on the surface of the casting body, and the service life of the blast furnace lining is further prolonged.
Further, in the step (3), the steel fiber is pressed into the first layer casting body by at least 3mm.
It can be understood that by limiting the pressing of the steel fibers into the first layer casting body to at least 3mm, the steel fibers can be more effectively prevented from being washed away or deflected due to the fact that the direction of the steel fibers is not changed due to the pushing of the material flow when the base material is poured next.
Further, in the step (3), the bottom of the steel pestle is flat. The flat bottom can be square or round, and the bottom of the steel pestle is preferably square with the side length of 90mm-120 mm.
Further, in the step (6), the curing time is 6 to 8 hours.
It will be appreciated that by limiting the curing time to a reasonable value, solidification and hardening of the casting body is facilitated, so that sufficient strength is obtained to increase the service life of the casting material.
Further, the thickness of each layer is controlled between 45mm and 55mm during the pouring process of each layer. Preferably, the thickness of each layer is controlled to be 50mm.
Because the matrix material does not contain steel fibers, the matrix material is uniformly discharged in the pumping process and automatically flows after entering the die, and the pouring thickness can be determined according to the pouring time of each layer of matrix material.
Furthermore, the length of the steel fiber is 25mm-35mm, and the diameter of the steel fiber is 0.5mm-1.5mm. Preferably, the diameter is 1mm.
The amount of the steel fiber added can be adjusted according to the actual construction requirements, for example, the content of the steel fiber in the casting material at the furnace belly part is more than 35%, the content of the steel fiber in the casting material at the furnace waist part is more than 25%, the content of the steel fiber in the casting material at the lower part of the furnace body is more than 15%, the content of the steel fiber in the casting material at the middle part of the furnace body is more than 5%, and the content of the steel fiber in the casting material at the upper part of the furnace body is more than 2%. If the addition amount is more than 30%, it is recommended to enlarge the mesh of the screen, and the specific size can be determined by simple experiment before casting.
The invention has the following beneficial effects:
(1) The invention adopts a construction mode of high steel fiber castable with layering and stepping to realize high efficiency and effect of pumping the high steel fiber castable; experiments prove that the construction speed is at least 10t/h (after the connection mode of all working procedures is actually optimized, the construction speed can reach 16 t/h), the pouring height per day is 2m, and the pouring speed is improved by more than 10 times compared with the manual feeding speed. Only 4 people are needed in the furnace in the construction process, the labor intensity is greatly reduced, and the potential safety hazard is reduced.
(2) The pouring method improves the application efficiency of the steel fibers, has good effect by adopting the placing device, is uniform, and can manually adjust the direction of the steel fibers, thereby prolonging the service life of the furnace lining.
Drawings
In order to more clearly illustrate the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic diagram of an exemplary embodiment of an applicator of the present invention at a first angle;
FIG. 2 is a schematic diagram of an exemplary embodiment of the present invention showing the placement device at a second angle;
fig. 3 is an enlarged view at I in fig. 2.
Reference numerals are as follows:
1: placing a device; 11: a screen frame; 12: a sieve plate; 120: and (4) screening holes.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Examples
The embodiment provides a pumping pouring method of a high steel fiber castable, which adopts a layered pouring mode, and each layer of pouring comprises three steps of pumping a base material, placing steel fibers and pressing; the method comprises the following specific steps:
step (1) preparation: the mixing station prepares the matrix material and the pumping equipment, prepares the mould, pours the construction platform in the stove, prepares the steel fiber (length is 30mm, diameter is 1.0 mm) and the placer, and the auxiliary flat bottom steel pestle (bottom is the square with the side length of 100 mm). Wherein, the weight of the placing device is about 1kg, which is convenient for manual carrying and operation. The structure schematic diagram of the placing device is shown in figures 1-3. Put ware 1 and include reel 11 and set up the sieve 12 of reel 11 bottom is provided with a plurality of sieve meshes 120 on sieve 12, and sieve mesh 120 sets up and the slope of slope is 0.3% with 12 plane inclinations on the sieve.
Step (2): and erecting a first-step mold, pumping the matrix material into the first-step mold in the blast furnace, and pouring a first layer with the thickness of 50 +/-5 mm to form a first-layer pouring body.
And (3): moving the material pipe, and placing the steel fibers on the surface of the first layer of casting body by using a placing device 1; in the placing process, one side of the sieve plate 12 is attached to or close to the surface of the first-layer casting body, steel fibers are added into the sieve frame 11 along one side of the sieve plate 12 departing from the first-layer casting body, and the steel fibers pass through the sieve holes 120 under the vibration condition of the oscillator and are placed on the surface of the first-layer casting body. More than 90% of the steel fibers embedded in the pouring layer are kept perpendicular to the wall surface of the cooling wall of the furnace by scatteringStraight or near vertical positions, and for steel fibers that are not perpendicular to the wall surface, they can be adjusted to positions perpendicular to the wall surface by manual trimming. The distribution mode of the steel fibers in the casting body is as follows: arranging a layer of steel fiber every 50mm along the height direction of the casting body; the spacing between the steel fibres is 5mm in the radial direction of the cast body; the spacing between the steel fibres is 5mm along the circumferential direction of the cast body; the area of each placing is 0.09m 2 。
And (4): the steel fibers are pressed into the first layer of casting body by a steel pestle to be less than 2 mm.
And (5): and (5) performing ring construction, and pouring the next layer after the first layer of pouring body is pressed with steel fibers along the circumferential direction.
And (6): and (5) repeating the steps (3) to (5) until the first step of pouring of the mold is completed.
And (7): and after the first-step mold construction is finished, maintaining for 6-8 h.
And (8): and (5) after the maintenance is finished, erecting the next step of mold, and repeating the steps (2) to (7) until all the lining pouring construction is finished.
And (9): and demolding to form the cast lining.
Tests show that the pumping pouring method can realize pumping pouring lining manufacturing of the high steel fiber pouring material, the construction speed can reach 16t/h, the pouring height per day is 2m, and the feeding speed is improved by more than 10 times compared with that of manual feeding. In addition, only 4 people are needed in the furnace in the construction process, the labor intensity is greatly reduced, and the potential safety hazard is reduced.
Meanwhile, due to the layered pouring and the uniform arrangement of the steel fibers, the steel fibers are added in the pouring material in a large proportion and distributed in order, so that the shrinkage of the material in the curing process is crack-free, the thermal expansion of the blast furnace in the operation process is offset by the inside of the pouring body, and the service life of the blast furnace lining is prolonged.
Although the invention has been described in detail with respect to the general description and the specific embodiments thereof, it will be apparent to those skilled in the art that modifications and improvements can be made based on the invention. Accordingly, it is intended that all such modifications and alterations be included within the scope of this invention as defined in the appended claims.
Claims (10)
1. A pumping pouring method of a high steel fiber pouring material is characterized in that a layered pouring mode is adopted, and each layer of pouring comprises three steps of pumping a base material, placing steel fibers and pressing.
2. The pump casting method according to claim 1, comprising the steps of:
step (1): erecting a first-step mold, pumping the matrix material into the first-step mold in a blast furnace, and pouring a first layer to form a first-layer pouring body;
step (2): placing the steel fibers on the surface of the first layer of casting body by using a placing device;
and (3): pressing the steel fibers into the first layer casting body by using a steel pestle;
and (4): after the first layer of casting body is pressed into the steel fiber along the circumferential direction, the next layer is cast;
and (5): repeating the step (2) to the step (4) until the pouring of the first-step mold is completed;
and (6): maintaining;
and (7): after the maintenance is finished, erecting the next step of mold, and repeating the steps (1) and (6) until all the lining pouring construction is finished;
and (8): and demolding to form the cast lining.
3. The pumping casting method according to claim 2, wherein in the step (2), the placer comprises a screen frame and a screen plate arranged at the bottom of the screen frame, and a plurality of screen holes are arranged on the screen plate;
in the placing process, the bottom surface of the sieve plate is attached or pressed close to the surface of the first layer casting body, the steel fibers are added into the sieve frame and are shaken left and right in the sieve frame, and the steel fibers penetrate through the sieve holes under the vibration condition and are placed on the surface of the first layer casting body.
4. The pumping and pouring method according to claim 3, wherein the sieve holes are arranged in the sieve plate in an inclined mode, and the inclined gradient is 0.2% -0.4%.
5. Pump casting method according to claim 3 or 4, characterized in that in step (2), after the laying is completed, the steel fibers are laid perpendicular to the cooling wall of the blast furnace.
6. The pump casting method according to claim 5, wherein in the step (2), the steel fibers are distributed in the first layer casting body in a manner that: arranging a layer of the steel fibers every 40-60 mm along the height direction of the first layer of casting body; the distance between the steel fibers along the radial direction of the first layer casting body is 4mm-6mm; the spacing between the steel fibers along the circumferential direction of the first layer of casting is 4mm-6mm; the placing area is 0.08m each time 2 -0.1m 2 。
7. A pump casting method according to claim 2, wherein in step (3) the steel fibres are pressed into the first layer casting by at least 3mm.
8. The pump casting method according to claim 2, wherein in the step (6), the curing time is 6 to 8 hours.
9. The pump casting method according to claim 1, wherein the thickness of each layer is controlled to be 45mm to 55mm during casting of each layer.
10. A pump casting method according to claim 1, wherein said steel fibers have a length of 25mm to 35mm and a diameter of 0.5mm to 1.5mm.
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| JPH028009A (en) * | 1988-06-27 | 1990-01-11 | Tokai Concrete Kogyo Kk | Centrifugal molding of fiber reinforced concrete product |
| CN1579722A (en) * | 2003-08-06 | 2005-02-16 | 首钢总公司 | Steel-containing fiber pouring material construction method and equipment |
| CN1944344A (en) * | 2006-10-31 | 2007-04-11 | 重庆钢铁(集团)有限责任公司 | Repairing material for shaft furnace lining and its operation |
| CN110193463A (en) * | 2019-06-06 | 2019-09-03 | 西南石油大学 | A kind of steel-fiber diffusing machine being used to prepare fiber concrete |
| CN111660404A (en) * | 2020-05-31 | 2020-09-15 | 太原理工大学 | Device and method for directionally arranging concrete prefabricated parts by steel fibers |
| CN112123544A (en) * | 2020-09-19 | 2020-12-25 | 河南华西耐火材料有限公司 | Construction method of integrated full-cast refractory structure applied to blast furnace lining |
| CN113927730A (en) * | 2021-09-23 | 2022-01-14 | 重庆建工建材物流有限公司 | Device and method for manufacturing tensile light-transmitting concrete |
| CN216000951U (en) * | 2021-10-11 | 2022-03-11 | 铁正检测科技有限公司 | UHPC mixes with steel fibre adds device |
| CN216337752U (en) * | 2021-05-26 | 2022-04-19 | 安阳钢铁股份有限公司 | Novel furnace lining structure for integral casting forming of large-scale blast furnace |
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2022
- 2022-12-29 CN CN202211702162.0A patent/CN115648388B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH028009A (en) * | 1988-06-27 | 1990-01-11 | Tokai Concrete Kogyo Kk | Centrifugal molding of fiber reinforced concrete product |
| CN1579722A (en) * | 2003-08-06 | 2005-02-16 | 首钢总公司 | Steel-containing fiber pouring material construction method and equipment |
| CN1944344A (en) * | 2006-10-31 | 2007-04-11 | 重庆钢铁(集团)有限责任公司 | Repairing material for shaft furnace lining and its operation |
| CN110193463A (en) * | 2019-06-06 | 2019-09-03 | 西南石油大学 | A kind of steel-fiber diffusing machine being used to prepare fiber concrete |
| CN111660404A (en) * | 2020-05-31 | 2020-09-15 | 太原理工大学 | Device and method for directionally arranging concrete prefabricated parts by steel fibers |
| CN112123544A (en) * | 2020-09-19 | 2020-12-25 | 河南华西耐火材料有限公司 | Construction method of integrated full-cast refractory structure applied to blast furnace lining |
| CN216337752U (en) * | 2021-05-26 | 2022-04-19 | 安阳钢铁股份有限公司 | Novel furnace lining structure for integral casting forming of large-scale blast furnace |
| CN113927730A (en) * | 2021-09-23 | 2022-01-14 | 重庆建工建材物流有限公司 | Device and method for manufacturing tensile light-transmitting concrete |
| CN216000951U (en) * | 2021-10-11 | 2022-03-11 | 铁正检测科技有限公司 | UHPC mixes with steel fibre adds device |
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