Receiving method of continuous casting stuffing sand

Abstract

The invention discloses a continuous casting ladle filler sand receiving method, which relates to the technical field of steel production, and comprises the following steps: placing a drainage groove under a long nozzle of a large ladle before casting of the steel ladle; the flowing state of the stuffing sand is observed, whether receiving of the stuffing sand is completed or not is judged, and the drainage groove is moved away after receiving of the stuffing sand is completed; and the treatment mode of the stuffing sand is determined based on the production field, and the stuffing sand is treated. By reasonably placing the drainage groove, accurately judging the flow guide sand amount, judging the brightness of sand and steel flowing out of the ladle nozzle and transferring the drainage groove away in time, the situation that the flow guide sand enters the intermediate tank to pollute molten steel can be effectively avoided, the purity of the molten steel and the yield of continuous casting molten steel casting are improved, and meanwhile the labor intensity of workers and the working environment risk are reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of steel production, in particular to a receiving method of continuous casting drainage sand. BACKGROUND

[0002] The drainage sand plays an auxiliary production role in the steelmaking process. Before the steel ladle is filled with the dephosphorized qualified molten steel in the converter or electric furnace, 30-45 kg / furnace of drainage sand is first injected at the bottom nozzle of the steel ladle. The purpose is to play a drainage role for the continuous casting start pouring, and to ensure the smooth flow of molten steel from the steel ladle into the production process of continuous casting. In production, it is connected with the steel ladle and the tundish. When the slide plate is pulled open, the unsintered part of the lower layer of the drainage sand automatically flows out, and the molten steel breaks the sintered layer of the upper layer of the drainage sand to flow into the tundish. This process is the automatic start pouring.

[0003] The steelmaking is a process of decarburization, dephosphorization, desulfurization, degasification and alloying of molten iron. It is to obtain a product that meets the performance requirements of users. Therefore, the composition and inclusions in the steelmaking process must be controlled. The composition of the drainage sand is quite different from that of the molten steel. It is an auxiliary material that must be used in the steelmaking process. Similar to refractory materials, it must be in contact with the molten steel. During the continuous casting start pouring, it often mixes and rushes into the tundish together with the molten steel. Part of the drainage sand is rolled into the mold, forming an organization inconsistent with the steel, which has a great impact on the performance of the product. After rolling, it will cause surface defects, and during user processing, it will cause quality problems such as cracking. Referring to Figure 1 As shown in Figure 1 , there is a large Cr-containing foreign metal at the cracking position of the product. The deformation resistance of the foreign metal is different from that of the steel, causing cracking at this position. The foreign metal is inside the billet and is fused together with the matrix, which should be brought in during the steelmaking and continuous casting process. That is, the billet rolls in the Cr-containing foreign metal (judged as drainage sand) to cause cracking and breaking.

[0004] In actual production, assuming that all the drainage sand enters the molten steel in the tundish, the mass ratio of the drainage sand and the steel is about 1:1400. Through XRF analysis of its composition, it can be known that the main components of the drainage sand are SiO2, Cr2O3, Fe2O3, Al2O3, MgO and other oxides. Especially the first three are oxidizing components, which are easy to oxidize active elements in the steel. Therefore, when producing high-purity molten steel, it is often necessary to receive the molten steel and the drainage sand to reduce the pollution of the molten steel, which is of great significance for special material steel. SUMMARY

[0005] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a receiving method of continuous casting drainage sand.

[0006] In order to solve the above technical problems, the technical scheme of the present application is as follows: A receiving method of continuous casting drainage sand, comprising: The flow channel is placed directly below the long nozzle of the ladle before the ladle is opened; The flow state of the flow sand is observed to determine whether the flow sand is received, and the flow channel is removed after the flow sand is received; The processing mode of the flow sand is determined based on the production site, and the flow sand is processed.

[0007] As a preferred scheme of the receiving method of the continuous casting flow sand, the observation of the flow state of the flow sand and the determination of whether the flow sand is received include: The flow sand operator observes the color of the flow sand, and removes the flow channel when the color of the flow sand changes from black to red.

[0008] As a preferred scheme of the receiving method of the continuous casting flow sand, the observation of the flow state of the flow sand and the determination of whether the flow sand is received include: The brightness of the long nozzle of the ladle is collected in real time by a brightness collection device, and the temperature of the flow sand is detected by a temperature collection device; When the collected brightness is greater than a first threshold value or the detected temperature of the flow sand is greater than a second threshold value, the flow channel is switched to a sand receiving position.

[0009] As a preferred scheme of the receiving method of the continuous casting flow sand, the first threshold value is 50 cd / m 2 , and the second threshold value is 150°C.

[0010] As a preferred scheme of the receiving method of the continuous casting flow sand, the observation of the flow state of the flow sand and the determination of whether the flow sand is received, and the removal of the flow channel after the flow sand is received also include: The bearing and impact force of the flow channel are detected in real time, and when the bearing beam of the flow channel is greater than 50 kg or the impact force is greater than 50 kg, the flow channel is automatically controlled to fall off, and the molten steel is automatically opened.

[0011] As a preferred scheme of the receiving method of the continuous casting flow sand, before the flow channel is placed directly below the long nozzle of the ladle before the ladle is opened, it also includes: The flow channel is checked to determine whether its state meets the use requirements; The ladle slide opening mechanism is checked to determine whether its flexibility and sealing meet the use requirements.

[0012] As a preferred scheme of the receiving method of the continuous casting flow sand, after the processing mode of the flow sand is determined based on the production site, and the flow sand is processed, it also includes: The residues in the flow channel are cleaned until the state of the flow channel meets the use requirements.

[0013] As a preferred scheme of the receiving method of the continuous casting drainage sand, the support frame has a V-shaped cross section, and the inner angle of the V shape is 125-135°.

[0014] As a preferred scheme of the receiving method of the continuous casting drainage sand, the length of the support frame is 600-700 mm.

[0015] As a preferred scheme of the receiving method of the continuous casting drainage sand, the thickness of the support frame is 8-12 mm.

[0016] The present application has the following beneficial effects: The present application can effectively avoid the drainage sand from entering the tundish to contaminate the molten steel, improve the purity of the molten steel and the yield of the continuous casting molten steel pouring, and reduce the labor intensity and the working environment risk of the workers. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0018] Figure 1 Energy spectrum analysis diagram for steel cracking position. DETAILED DESCRIPTION

[0019] In order to make the content of the present application more easily understood, the following will further describe the present application in detail according to the specific embodiments and in combination with the drawings.

[0020] The embodiment of the present application provides a receiving method of continuous casting drainage sand, which specifically comprises the following steps: Step S101: placing the drainage groove directly below the long nozzle of the ladle before the ladle is opened.

[0021] Specifically, the drainage groove is placed directly below the long nozzle of the ladle before the ladle is opened.

[0022] In the embodiment, the drainage groove comprises a support frame and a fiber tank arranged on the upper end surface of the support frame. The cross-sectional shape of the support frame is V-shaped, and the internal angle of the V-shaped is 125-135°. The length of the support frame is 600-700 mm. The thickness of the support frame is 8-12 mm. The support frame of the drainage groove is usually formed by bending a plate.

[0023] Step S102: observing the flow state of the drainage sand, judging whether the drainage sand is received completely, and removing the drainage groove after the drainage sand is received completely.

[0024] Specifically, this step can be controlled manually or automatically, as follows: Manual control: the operator of the drainage sand holds the hand-held rod of the drainage groove tightly with both hands, observes the color of the drainage sand, determines the amount of the received drainage sand, and judges whether the drainage sand is received completely. When the color of the drainage sand changes from black to red, it means that the drainage sand is about to be received completely or has been received completely, at which time the drainage groove is removed immediately.

[0025] Automatic control: observing the flow state of the drainage sand and judging whether the drainage sand is received completely. The brightness of the long nozzle of the ladle is collected in real time by a brightness collection device, and the temperature of the drainage sand is detected by a temperature collection device; when the collected brightness is greater than a first threshold value or the detected temperature of the drainage sand is greater than a second threshold value, the drainage groove is switched to the sand receiving position.

[0026] The first threshold value is 50 cd / m 2 , and the second threshold value is 150℃.

[0027] While the above automatic control is performed, the bearing and impact force of the drainage groove are also detected in real time, and when the bearing beam of the drainage groove is greater than 50 kg or the impact force is greater than 50 kg, the drainage groove is controlled to fall off automatically, so that the molten steel is poured automatically. In this way, on the one hand, the drainage sand can be received in a large proportion, and on the other hand, the safety of production can be ensured. This can reduce the problem of molten steel pollution caused by the drainage sand and improve the quality of the molten steel.

[0028] Step S103: determining the treatment method of the drainage sand based on the production site and treating the drainage sand.

[0029] Specifically, after receiving the drainage sand, appropriate methods can be selected for treatment according to the actual situation of the production site. For example, the collected drainage sand can be stored, cleaned or recycled, etc.

[0030] In order to ensure that the drainage sand is received in place and does not overflow, the following measures need to be taken: Preparation before receiving the drainage sand: Familiar with the equipment: the operator should be familiar with the structure and working principle of the ladle slide pouring mechanism and the drainage sand receiving device, so as to ensure that the equipment can be operated accurately and quickly.

[0031] Inspection of the equipment: Before each casting, the runner sand receiving device should be inspected to ensure that it is in good condition, properly positioned, and stable and reliable. At the same time, check whether the tundish slide opening mechanism is flexible and whether the sealing performance is good.

[0032] Preparation of the runner: Place the runner in the appropriate position to ensure that it can accurately receive the runner sand. The length, width, and height of the runner should be adjusted according to the actual production situation to meet the needs of receiving the runner sand.

[0033] Operation during the process of receiving the runner sand: Observe the flow of the runner sand: When the tundish slide is opened, the operator should closely observe the flow of the runner sand. When the runner sand begins to flow out, immediately align the runner under the nozzle to ensure that the runner sand can smoothly enter the runner.

[0034] Control the opening speed of the slide: By adjusting the speed and amplitude of the slide opening, the amount of runner sand flowing out can be controlled. The operator should adjust the opening speed of the slide according to the flow speed and amount of the runner sand to ensure that the runner sand can flow out uniformly and stably.

[0035] Close the slide in time: When the runner sand is about to flow out or has flowed out, or the light reaches the time, remove the runner sand slot. At this time, the runner should have collected enough amount of runner sand without overflow.

[0036] To ensure smooth production, the following measures are taken for the treatment of the received runner sand: Clean the runner: After each casting, the residues in the runner should be cleaned in time to ensure that the runner can smoothly receive the runner sand for the next use.

[0037] Check the quality of the runner sand: Check the collected runner sand to ensure that its quality meets the production requirements. If necessary, screening, cleaning, and other treatments can be performed.

[0038] Recycling: The runner sand that meets the requirements can be recycled. This not only reduces production costs but also contributes to environmental protection.

[0039] To ensure production safety, the following measures are taken: Avoid overflow of molten steel: During the process of receiving the runner sand, ensure that the molten steel does not overflow from the nozzle. If molten steel overflows, take immediate measures to handle it to prevent injury to equipment and personnel.

[0040] Ensure personnel safety: The operator should wear personal protective equipment such as safety helmets, protective glasses, gloves, etc. During the operation, pay attention to the changes in the surrounding environment to ensure personal safety.

[0041] Strengthen equipment maintenance: regularly on drainage sand receiving device and ladle slide open pouring mechanism maintenance and maintenance, to ensure that it is in good working condition. If found equipment failure or abnormal situation, should be timely stop and notify the maintenance personnel for processing.

[0042] Through the full preparation, correct operation, timely processing and the compliance of the matters needing attention, can ensure that the drainage sand can be received in place and not overflow.

[0043] Therefore, the technical scheme of the present application can effectively avoid the drainage sand into the tundish to pollute the molten steel, improve the purity of molten steel and the yield of continuous casting molten steel casting, and reduce the labor intensity and the working environment risk of workers by reasonably placing the drainage groove, accurately judging the drainage sand amount, judging the brightness of the sand and steel flowed out from the ladle nozzle, and timely transferring the drainage groove.

[0044] In addition to the above embodiments, the present application can have other implementation manners; any technical scheme formed by equivalent replacement or equivalent transformation falls within the protection scope required by the present application.

Claims

1. A method for receiving continuous casting guide sand, characterized in that: include: Before pouring begins, place the drainage channel directly below the long nozzle of the ladle; Observe the flow state of the diversion sand to determine whether the diversion sand has been completely received, and remove the diversion trough after the diversion sand has been received; The treatment method for the diversion sand was determined based on the production site, and the diversion sand was then treated.

2. The method for receiving continuous casting guide sand according to claim 1, characterized in that: The observation of the flow state of the diversion sand and the determination of whether the diversion sand has been completely received include: The operator observes the color of the diversion sand and removes the diversion trough when the color of the diversion sand changes from black to red.

3. The method for receiving continuous casting guide sand according to claim 1, characterized in that: The observation of the flow state of the diversion sand and the determination of whether the diversion sand has been completely received include: The brightness of the large water inlet is collected in real time by a brightness acquisition device, and the temperature of the diversion sand is detected by a temperature acquisition device. When the collected light intensity is greater than the first threshold or the detected temperature of the diversion sand is greater than the second threshold, the diversion trough will be moved to the sand receiving position.

4. The method for receiving continuous casting guide sand according to claim 3, characterized in that: The first threshold is 50 cd / m 2 The second threshold is 150°C.

5. The method for receiving continuous casting guide sand according to claim 1, characterized in that: The process of observing the flow state of the diverting sand, determining whether the diverting sand has been completely received, and removing the diversion trough after the diverting sand has been received also includes: The load-bearing capacity and impact force of the diversion channel are monitored in real time. When the load-bearing beam of the diversion channel is detected to be greater than 50kg or the impact force is greater than 50kg, the diversion channel is controlled to automatically detach, so that the molten steel can be poured automatically.

6. The method for receiving continuous casting guide sand according to claim 1, characterized in that: Before placing the diversion channel directly below the long nozzle of the ladle before pouring begins, the process also includes: Inspect the drainage channel to determine if its condition meets the usage requirements; Inspect the ladle slide opening mechanism to determine whether its flexibility and sealing meet the usage requirements.

7. The method for receiving continuous casting guide sand according to claim 1, characterized in that: After determining the treatment method for the diversion sand based on the production site and treating the diversion sand, the process further includes: Clean the residue inside the drainage channel until the drainage channel meets the usage requirements.

8. The method for receiving continuous casting guide sand according to claim 1, characterized in that: The drainage channel includes a support frame and a fibrous groove disposed on the upper end face of the support frame. The cross-sectional shape of the support frame is V-shaped, and the inner angle of the V-shape is 125~135°.

9. The method for receiving continuous casting guide sand according to claim 8, characterized in that: The length of the support frame is 600~700mm.

10. The method for receiving continuous casting guide sand according to claim 8, characterized in that: The thickness of the support frame is 8~12mm.

Images