Experimental device for simulating erosion of RH insert tube

Abstract

The invention provides an experimental device for simulating corrosion of an RH insert tube, which is characterized by comprising a crankshaft reciprocating device (A), a high-temperature melting device (B) and a refractory material rod piece (9) for simulating the RH insert tube, the crankshaft reciprocating device (A) comprises a crankshaft reciprocating mechanism (1) which is installed on the lifting mechanism (8). The high-temperature melting device (B) comprises a temperature controller (17) and a high-temperature furnace; one end of the refractory material rod piece (9) for simulating the RH insert tube is connected with the crankshaft reciprocating mechanism (1), and the other end of the refractory material rod piece (9) penetrates through the high-temperature furnace and enters the high-temperature furnace. The simulation experiment device is easy to operate, high in stability, suitable for long-time operation, suitable for being widely applied to simulation of erosion experiment research of the insert tube and also capable of being applied to simulation of slag bonding experiment research of the insert tube.

Description

Technical Field

[0001] The invention relates to the field of metallurgy, and in particular to an experimental device for simulating RH insertion tube erosion. Background Art

[0002] The RH refining process is increasingly used to improve the quality of molten steel. By heating, deoxidizing, desulfurizing and removing inclusions from the molten steel, high alloying and homogenization of temperature and composition are achieved, thereby producing high-quality steel. This technology has become a key smelting technology in the modern metallurgical industry. However, the insert tubes used in the RH refining process often have a reduced service life due to severe erosion, and need to be replaced in advance, which not only affects the continuity of production but also increases production costs. Therefore, it is very necessary to have a deep understanding of the interaction between the refractory castable outside the insert tube and the slag in the RH refining process and the behavior of the insert tube being eroded by the slag.

[0003] In the RH refining process, there are many reasons why the refractory material of the insert tube is corroded by the slag, mainly including the composition of the refining ladle slag, the rapid change of temperature, the material of the refractory material, the type of steel smelted and the smelting process conditions.

[0004] Since the RH insert tube is in a high-temperature and changeable complex environment during the RH refining process, it is difficult and costly to conduct qualitative observations and quantitative tests on the erosion of the insert tube by slag directly at the production site. Therefore, most research on the erosion of the insert tube needs to be carried out in the laboratory.

[0005] The erosion problem of RH insert tube is essentially the interaction problem between the refractory material used as the insert tube and the slag. At present, there are many studies on testing the slag erosion of refractory materials at home and abroad. Except for a few experiments using simple indirect methods, most of them are carried out by simulating the actual erosion conditions of refractory materials during use. These methods can be roughly divided into the following two categories: static methods represented by the crucible method and dynamic methods represented by the rotating rod method.

[0006] In the actual production process, as the ladle refining process proceeds, the slag liquid level in contact with the RH insertion tube presents a periodic rise-fall change, resulting in a periodic change in the surface temperature of the insertion tube. The relative movement between the RH insertion tube and the slag in contact with it and the temperature change caused by it will inevitably affect the interaction between the insertion tube and the slag, and thus will also affect the erosion problem of the insertion tube. Obviously, the traditional simulation test method based on the static crucible method and the simulation test method based on the dynamic rotation method cannot reflect the phenomenon that the slag liquid level in contact with the RH insertion tube presents a periodic rise-fall change, resulting in a deviation between the simulated erosion conditions and the actual erosion conditions, which will affect the accuracy of the experimental results. On the other hand, in the actual production process, the RH insert tube is usually used continuously for many times in multiple-furnace ladle refining. The insert tube will experience changes in the surrounding medium conditions when it is lowered into the slag and lifted out of the slag many times. This periodic change in conditions of the insert tube lowering into the slag and lifting out of the slag will also affect the erosion problem of the RH insert tube. It is difficult to simulate the impact of such condition changes on the erosion of the insert tube using the traditional static crucible method and dynamic rotation law. Summary of the invention

[0007] The present invention aims at the disadvantages of the existing experimental method for the RH insertion tube erosion problem and provides a simulation experimental device for studying the RH insertion tube erosion problem.

[0008] The technical solution of the present invention is as follows: An experimental device for simulating RH insert tube erosion, comprising a crankshaft reciprocating device (A), a high temperature melting device (B) and a refractory rod (9) simulating the RH insert tube;

[0009] The crankshaft reciprocating device (A) comprises:

[0010] A crankshaft reciprocating mechanism (1), wherein the crankshaft reciprocating mechanism (1) is mounted on the lifting mechanism (8);

[0011] The high temperature melting device (B) comprises: a temperature controller (17) and a high temperature furnace;

[0012] One end of the refractory rod (9) simulating the RH insertion tube is connected to the crankshaft reciprocating mechanism (1), and the other end passes through the high-temperature furnace and enters the interior of the high-temperature furnace.

[0013] Preferably, the crankshaft reciprocating device (1) comprises:

[0014] The aluminum alloy base (5) is fixed to one side of the lifting mechanism (8) in parallel with the connecting piece surface and at a certain distance.

[0015] A reciprocating mechanism rocker arm pull rod (2) has one end connected to a reciprocating motor (3) and the other end connected to a speed regulating telescopic rod (6), and the reciprocating mechanism rocker arm pull rod (2) and the telescopic rod (6) are located in a space between the aluminum alloy base and the lifting mechanism (8);

[0016] The reciprocating motor (3) is located on the other side of the aluminum alloy base (5) relative to the lifting mechanism (8); and the motor output shaft is connected to the rocker arm pull rod (2) of the reciprocating mechanism;

[0017] The speed controller (4) is electrically connected to the reciprocating motor (3) to control the output shaft speed of the reciprocating motor (3).

[0018] Preferably, the movement mode of the reciprocating mechanism rocker arm pull rod (2) of the crankshaft reciprocating device (A) is a reciprocating cycle.

[0019] Preferably, the lower part of the telescopic rod (6) is provided with a cylindrical connecting piece (7), through which the lower end of the telescopic rod is connected to the upper end of the refractory material rod (9) simulating the RH insertion tube.

[0020] Preferably, the high temperature furnace comprises:

[0021] Furnace body (11);

[0022] A furnace cover (10) is arranged above the furnace body;

[0023] The furnace tube (12) is located in the furnace body.

[0024] A base (16) is arranged at the bottom of the furnace tube (12), and a graphite crucible (13) is arranged on the base;

[0025] The graphite crucible (13) contains slag (14),

[0026] A thermocouple (18) heats the graphite crucible (13) via the base (16);

[0027] One end of the refractory material rod (9) is located in the graphite crucible (13) and can move up and down, making relative movement with the slag (14).

[0028] Preferably, the temperature controller (17) is connected to the thermocouple (18), and the high-temperature furnace is temperature-controlled via the temperature controller (17).

[0029] Preferably, it further comprises a silicon-molybdenum rod (15), which is arranged on the inner side of the furnace body (11) and the outer side of the furnace tube (12).

[0030] Preferably, the lifting mechanism (8) is used to control the ascending and descending movement of the refractory rod (9) simulating the RH insertion tube.

[0031] Preferably, the refractory rod (9) simulating the RH insertion tube is a rod-shaped object determined according to the material of the simulated RH insertion tube, and the refractory material includes: amorphous castables used for the RH insertion tube and refractory materials formed by coatings.

[0032] Preferably, the refractory material is selected from corundum refractory material, corundum-spinel refractory material, corundum-mullite refractory material and chromium-corundum refractory material.

[0033] The RH insertion tube erosion simulation experimental device of the present invention has the following advantages:

[0034] The method can simulate the relative movement between the RH insertion tube and the slag in actual production to reflect the influence of the periodic rise and fall of the slag liquid level in contact with the RH insertion tube in actual production on the erosion of the RH insertion tube by the slag.

[0035] The cyclical change process of the insertion tube descending into the slag and rising away from the slag when the insertion tube is continuously used in multiple-furnace ladle refining can be simulated, so as to simulate the interaction between the slag and the RH insertion tube and the influence of the temperature change of the insertion tube lifting process on the erosion of the insertion tube.

[0036] It can provide samples of refractory material erosion of the insert tube by slag, which is closer to the actual production conditions, for the erosion research of the RH insert tube, and provide basic conditions for subsequent more in-depth experimental analysis based on sample detection (such as phase detection, component analysis, reaction characteristic analysis between the insert tube material and slag, and analysis of the cause and mechanism of insert tube erosion, etc.).

[0037] The simulation experimental device is simple to operate and has high stability, is suitable for long-term operation, and is suitable for being widely used in erosion experimental research of simulated insertion pipes, and can also be used in slag sticking experimental research of simulated insertion pipes. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a structural schematic diagram of the simulation experiment device of the present invention.

[0039] Figure 2 This is a side schematic diagram of the crankshaft reciprocating mechanism 1 provided by the present invention.

[0040] Figure 3 The figure is a schematic diagram simulating the rising and falling process of the refractory rod 9 inserted into the tube in the slag 14 in the graphite crucible 13.

[0041] Figure 4 This is a macroscopic morphology diagram of the erosion process of the refractory rod in Example 1.

[0042] Figure 5This is a macroscopic morphology diagram of the erosion process of the refractory rod in Example 2. DETAILED DESCRIPTION

[0043] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with specific implementation methods.

[0044] The present invention relates to an experimental device for simulating RH insertion tube erosion, the experimental device system comprises a crankshaft reciprocating device, a high-temperature melting device and a refractory material rod simulating the RH insertion tube, wherein the crankshaft reciprocating device is composed of a crankshaft reciprocating mechanism, a lifting control mechanism, a speed regulating reciprocating motor, and a speed regulating controller, the high-temperature melting device is composed of a temperature controller and a high-temperature furnace, and the refractory material rod is a rod-shaped object determined according to the material of the simulated RH insertion tube. The high-temperature furnace in the high-temperature melting device is used to melt slag and maintain a high-temperature environment, and the temperature in the high-temperature furnace is kept constant within a corresponding range through the temperature controller. The crankshaft reciprocating mechanism and the lifting control mechanism in the crankshaft reciprocating device are used to drive the refractory rod used to simulate the RH insertion tube to move up and down, so as to simulate the relative movement between the RH insertion tube and the slag in actual production and the periodic changes in the contact conditions between the insertion tube and the surrounding medium when the insertion tube is continuously used in multiple-furnace ladle refining. On the one hand, it reflects the periodic rise and fall of the slag liquid level in contact with the RH insertion tube in actual production, and on the other hand, it reflects the periodic change process of the insertion tube descending and immersing in the slag-insertion tube rising and leaving the slag when the insertion tube is continuously used in multiple-furnace ladle refining, so as to simulate the interaction between the slag and the RH insertion tube and the influence of temperature changes in the insertion tube lifting process on the erosion of the insertion tube. The simulation experimental device can be used to experimentally observe the erosion of the RH insert tube by slag under different time, temperature and insert tube material conditions, and can also obtain samples of the refractory material of the insert tube being eroded by slag that are closer to the actual production conditions, providing basic conditions for subsequent in-depth experimental analysis based on sample detection (such as phase detection, component analysis, reaction characteristics analysis between the insert tube material and slag, and analysis of the cause and mechanism of insert tube erosion, etc.). The simulation experimental device is simple to operate, has high stability, is suitable for long-term operation, and is suitable for wide application in experimental research on simulated insert tube erosion, and can also be used in experimental research on simulated insert tube slag sticking.

[0045] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0046] like Figure 1The experimental device provided by the present invention includes: a crankshaft reciprocating device A including a crankshaft reciprocating mechanism 1, a reciprocating mechanism rocker arm pull rod 2, a speed regulating reciprocating motor 3, a speed regulating controller 4, an aluminum alloy base 5, a telescopic rod 6, a cylindrical connecting piece 7, and a lifting mechanism 8; a refractory material rod 9 simulating an insertion tube; a high-temperature melting device B including a temperature controller 17 and a furnace cover 10, a furnace body 11, a furnace tube 12, a graphite crucible 13, slag 14, a silicon-molybdenum rod 15, a base 16, a thermocouple 18, and an air inlet 19 in a high-temperature furnace.

[0047] The crankshaft reciprocating device (A) comprises: a crankshaft reciprocating mechanism (1), and the crankshaft reciprocating mechanism (1) is installed on the lifting mechanism (8); the high-temperature melting device (B) comprises: a temperature controller (17) and a high-temperature furnace; one end of the refractory material rod (9) simulating the RH insertion tube is connected to the crankshaft reciprocating mechanism (1), and the other end passes through the high-temperature furnace and enters the interior of the high-temperature furnace.

[0048] Preferably, the crankshaft reciprocating device (1) comprises: an aluminum alloy base (5) fixed to one side of the lifting mechanism (8) in parallel with a connecting piece surface and at a certain distance; a reciprocating mechanism rocker arm pull rod (2) connected to a reciprocating motor (3) at one end and connected to a speed regulating telescopic rod (6) at the other end, and the reciprocating mechanism rocker arm pull rod (2) and the telescopic rod (6) are located in the space between the aluminum alloy base and the lifting mechanism (8); the reciprocating motor (3) is located on the other side of the aluminum alloy base (5) relative to the lifting mechanism (8); and the motor output shaft is connected to the reciprocating mechanism rocker arm pull rod (2); and a speed regulating controller (4) is electrically connected to the reciprocating motor (3) to control the output shaft speed of the reciprocating motor (3).

[0049] According to the present invention, Figure 2 As shown, the reciprocating mechanism rocker arm pull rod (2) is divided into three parts. The first part is a first connecting member connected to the reciprocating motor output shaft through a pivot, a second connecting rod connected to the telescopic rod (6), and a displacement rod connecting the first connecting member and the second connecting rod. The three structures form a similar crankshaft slider structure or a reciprocating connecting rod structure. The vertical reciprocating motion of the second connecting rod is ensured by the limit device below. The mechanism stroke of the reciprocating mechanism rocker arm pull rod in the crankshaft reciprocating device is 20-80mm. The movement mode of the crankshaft reciprocating device is a reciprocating cycle. The speed regulating reciprocating motor in the crankshaft reciprocating device is controlled by a speed controller, and the speed controller uses a 220V power supply.

[0050] According to the present invention, the lower part of the telescopic rod (6) is provided with a cylindrical connecting piece (7), through which the lower end of the telescopic rod is connected to the upper end of the refractory rod (9) simulating the RH insertion tube.

[0051] The speed regulating motor and the speed regulating controller in the crankshaft reciprocating device are used to control the movement of the refractory rod member simulating the RH insertion tube connected as a whole with the telescopic rod, so as to simulate the relative movement between the RH insertion tube and the slag in actual production, so as to reflect the periodic rise and fall of the slag liquid level in contact with the RH insertion tube in actual production. Preferably, the mechanism stroke of the lifting control mechanism in the crankshaft reciprocating device is 0-660mm. The lifting control mechanism is used to control the rising and falling movement of the refractory rod member simulating the RH insertion tube, so as to reflect the periodic change process of the insertion tube descending and immersing in the slag-the insertion tube rising and leaving the slag when the insertion tube is continuously used in multi-furnace ladle refining, so as to simulate the interaction between the slag and the RH insertion tube and the influence of the temperature change of the insertion tube lifting process on the erosion of the insertion tube.

[0052] like Figure 1 As shown, the high-temperature furnace comprises: a furnace body (11); a furnace cover (10) arranged above the furnace body; a furnace tube (12) located in the furnace body, a base (16) is arranged at the bottom of the furnace tube (12), and a graphite crucible (13) is arranged on the base; the graphite crucible (13) contains slag (14) and a thermocouple (18), and the graphite crucible (13) is heated by the base (16); one end of the refractory material rod (9) is located in the graphite crucible (13) and can move up and down, and move relative to the slag (14).

[0053] The temperature controller (17) is connected to the thermocouple (18), and the high-temperature furnace is temperature-controlled via the temperature controller (17).

[0054] In order to obtain the high temperature required for the simulation, the high temperature furnace of the present invention uses a silicon molybdenum rod (15) as a heating element, which is arranged inside the furnace body (11) and outside the furnace tube (12). The temperature controller (17) can be set to a temperature of room temperature to 1800° C., so that the temperature in the high temperature furnace is constant within a corresponding range.

[0055] like Figure 3 As shown, the graphite crucible (13) in the high temperature furnace is used to contain the experimental slag (14). During the experiment, the refractory rod (9) simulating the RH insertion tube will be immersed in the slag or lifted away from the slag, so as to simulate the interaction between the refractory material of the RH insertion tube and the slag, and simulate the process of the RH insertion tube being corroded by the slag.

[0056] The high temperature furnace also includes an air inlet (19) for introducing protective gas, and the furnace body and furnace cover of the high temperature furnace are provided with cooling water inlet and outlet for externally connecting cooling water to cool the furnace body and furnace cover.

[0057] The lifting mechanism (8) is used to control the overall ascending and descending movement of the refractory rod (9) simulating the RH insertion tube.

[0058] According to the present invention, the refractory rod (9) simulating the RH insertion tube is a rod-shaped object determined according to the material of the RH insertion tube to be simulated, and the refractory material can be selected from: the non-shaped castable and coating-molded refractory material used for the RH insertion tube, preferably corundum refractory material, corundum-spinel refractory material or corundum-mullite refractory material and chromium-corundum refractory material.

[0059] The refractory rod simulating the RH insertion tube is a rod-shaped object determined according to the material of the RH insertion tube to be simulated. Replacing the refractory rod with different materials can be used to simulate the erosion experiment of the RH insertion tube with different materials. The specific experimental steps are as follows:

[0060] First, turn on the cooling water, start the high-temperature furnace to start heating, and when the temperature of the high-temperature furnace rises to the experimental temperature, keep it warm.

[0061] Put the experimental slag into the crucible. The slag height should not be higher than 2 / 3 of the crucible height, and the slag volume should be at least greater than 1 / 2 of the crucible capacity. Put the crucible with the experimental slag into a high-temperature furnace that has been heated to a certain temperature, and stir it with a molybdenum rod after the slag is melted. In addition, you can also put the crucible with the experimental slag into the high-temperature furnace before starting the high-temperature furnace to heat up, and then keep it warm when the temperature of the high-temperature furnace rises to the experimental temperature.

[0062] Before the experiment, the upper end of the refractory rod simulating the RH insertion tube is connected to the lower end of the telescopic rod in the crankshaft reciprocating device. The lower part of the telescopic rod is provided with a cylindrical connecting piece, and the connecting piece has a tightening adjustment screw for fixing the telescopic rod and the refractory rod.

[0063] Start the lifting mechanism in the crankshaft reciprocating device, first lower the refractory rod simulating the RH insertion tube to the slag liquid level, then start the speed-regulating reciprocating motor and the speed-regulating controller in the crankshaft reciprocating device to make the refractory rod simulating the RH insertion tube reciprocate up and down in the slag, so as to simulate the effect of the periodic rise and fall of the slag liquid level in contact with the RH insertion tube in actual production on the erosion of the RH insertion tube.

[0064] When the working time of the RH insertion tube is reached, the speed regulating reciprocating motor and the speed regulating controller in the crankshaft reciprocating device are turned off, and then the refractory rods are lifted to about 20 mm above the furnace cover by the lifting mechanism. The refractory rods are then photographed to record the macroscopic morphology of the refractory rods simulating the RH insertion tube after being corroded by the slag, thus completing a furnace of RH insertion tube erosion simulation experiment.

[0065] When time passes to the start working time of the RH insertion tube of the next heat, repeat the above operation to carry out the simulation experiment of the next heat. Repeating multiple experiments on the same refractory rod can reflect the periodic change process of the insertion tube descending and immersing in the slag when it is continuously used in multi-furnace ladle refining-the insertion tube rises and leaves the slag, thereby simulating the influence of changing conditions during multi-furnace ladle refining on the erosion of the insertion tube.

[0066] After the refractory rods have cooled, sampling can be carried out to obtain samples for studying the problem of insert tube erosion, providing basic conditions for subsequent more in-depth experimental analysis based on sample testing (such as phase detection, composition analysis, analysis of the reaction characteristics between the insert tube material and slag, and analysis of the cause and mechanism of insert tube erosion, etc.).

[0067] The graphite crucible containing the molten slag is taken out and air-cooled, and the cooled slag is sampled to obtain a slag sample for research and analysis.

[0068] Turn off the high temperature furnace and complete the experiment.

[0069] The following are specific experimental examples to demonstrate the advantages of the present invention.

[0070] Example 1

[0071] In this embodiment, the high-temperature furnace used to simulate the RH insertion tube erosion experiment is a silicon-molybdenum furnace, and the furnace tube is made of corundum. The heating system of this embodiment is to heat up at 15°C / min when it is lower than 1000°C, and to heat up at 10°C / min when it is higher than 1000°C, and to keep warm at the experimental temperature of 1500°C.

[0072] The dimensions of the graphite crucible used in this experimental example are: outer diameter D=70 mm, inner diameter d=55 mm, outer height H=120 mm, and inner height h=110 mm.

[0073] In this embodiment, the refractory material rod simulating the insertion tube is a corundum rod with a diameter of 6 mm to simulate the outer layer material of the insertion tube made of corundum.

[0074] The slag material used in this example was prepared using analytically pure chemical reagents, and the specific components and their mass fractions are shown in Table 1.

[0075] Table 1 Chemical composition of slag used in the experiment

[0076] Component CaO <![CDATA[SiO 2 ]]> <![CDATA[Al 2 THE 3 ]]> MgO FeO MnO <![CDATA[CaF 2 ]]> <![CDATA[Na 2 The]]> R Mi Mass fraction, % 52.12 17.38 20.00 3.00 1.00 0.50 3.00 3.00 3.00 0.15

[0077] This embodiment uses 250g of slag and the experimental temperature is 1500°C.

[0078] This embodiment adopts Figure 1 The experimental steps for the RH insertion tube erosion simulation experiment using the device in the apparatus are as follows:

[0079] Step 1: Before the experiment, connect the upper end of the refractory rod simulating the RH insertion tube to the lower end of the telescopic rod in the crankshaft reciprocating device, then start the lifting mechanism in the crankshaft reciprocating device, lower the refractory rod to about 20mm above the silicon-molybdenum furnace cover, and take photos before the refractory rod erosion experiment.

[0080] Step 2: Turn on the cooling water to heat up the silicon-molybdenum furnace. After the temperature of the silicon-molybdenum furnace rises to 1500℃, keep it warm. Then put the graphite crucible filled with slag into the furnace for melting. After melting, use a molybdenum rod to stir it evenly.

[0081] Step 3: Start the lifting mechanism in the crankshaft reciprocating device to slowly lower the refractory rod to above the liquid surface. After the temperature stabilizes, start the speed-regulating reciprocating motor and the speed-regulating controller in the crankshaft reciprocating device to make the refractory rod reciprocate up and down in the slag in the graphite crucible, thereby simulating the effect of the periodic rise and fall of the slag liquid level in contact with the RH insert tube in actual production on the erosion of the RH insert tube.

[0082] Step 4: After the refractory rod has been in the slag for 10 minutes, turn off the speed regulating reciprocating motor and the speed controller in the crankshaft reciprocating device, and then use the lifting mechanism to lift the refractory rod to about 20 mm above the furnace cover. Then take pictures of the refractory rod, record the macroscopic morphology of the refractory rod after being corroded by the slag to complete an RH insert tube erosion simulation experiment.

[0083] Step 5: After the refractory rod has cooled for 10 min, repeat the operation and conduct the next simulation experiment; repeat the experiment 4 times on the same refractory rod to reflect the periodic change process of the insert tube descending into the slag and rising out of the slag when it is continuously used in multi-furnace ladle refining, so as to simulate the effect of changing conditions during multi-furnace ladle refining on the erosion of the insert tube. Figure 4 This is the macroscopic morphology of the erosion process of the refractory rod obtained by 5 shots. This figure reflects the macroscopic morphological changes of the refractory rod eroded by slag during the simulation process, that is, with the increase in the number of uses and the extension of the erosion time, the refractory rod inserted into the slag gradually becomes thinner due to the erosion of the slag. By recording the size changes of the refractory rod inserted into the slag each time, the macroscopic law of the erosion of the refractory rod by the slag can be obtained. This device fully considers the consistency of the simulated temperature, slag and refractory properties with the actual working conditions, which can ensure the accuracy of the simulation.

[0084] Step 6: After the refractory rods have cooled, sampling can be performed to obtain samples for studying the problem of insert tube erosion, providing basic conditions for subsequent more in-depth experimental analysis based on sample testing (such as phase detection, composition analysis, analysis of the reaction characteristics between the insert tube material and slag, and analysis of the cause and mechanism of insert tube erosion, etc.).

[0085] Step 7: Take out the graphite crucible containing the slag and air-cool it. Sampling is performed on the cooled slag to obtain a slag sample for research and analysis.

[0086] Step 8: Turn off the high temperature furnace and complete the experiment.

[0087] Example 2

[0088] In this embodiment, the high-temperature furnace used to simulate the RH insertion tube erosion experiment is a silicon-molybdenum furnace, and the furnace tube is made of corundum. The heating system of this embodiment is to heat up at 15°C / min when it is lower than 1000°C, and to heat up at 10°C / min when it is higher than 1000°C, and to keep warm at the experimental temperature of 1500°C.

[0089] The dimensions of the graphite crucible used in this experimental example are: outer diameter D=70 mm, inner diameter d=55 mm, outer height H=120 mm, and inner height h=110 mm.

[0090] In this embodiment, the refractory material rod simulating the insertion tube is a corundum rod with a diameter of 6 mm to simulate the outer layer material of the insertion tube made of corundum.

[0091] The slag material used in this example was prepared using analytically pure chemical reagents, and the specific components and their mass fractions are shown in Table 2.

[0092] Table 2 Chemical composition of slag used in the experiment

[0093] Component CaO <![CDATA[SiO 2 ]]> <![CDATA[Al 2 THE 3 ]]> MgO FeO MnO <![CDATA[CaF 2 ]]> <![CDATA[Na 2 The]]> R Mi Mass fraction, % 55.91 28.1 8.2 2.94 3.94 0.39 2.29 - 1.99 0.224

[0094] This embodiment uses 250g of slag and the experimental temperature is 1500°C.

[0095] This embodiment adopts Figure 1 The experimental steps for the RH insertion tube erosion simulation experiment using the device in the apparatus are as follows:

[0096] Step 1: Before the experiment, connect the upper end of the refractory rod simulating the RH insertion tube to the lower end of the telescopic rod in the crankshaft reciprocating device, then start the lifting mechanism in the crankshaft reciprocating device, lower the refractory rod to about 20mm above the silicon-molybdenum furnace cover, and take photos before the refractory rod erosion experiment.

[0097] Step 2: Turn on the cooling water to heat up the silicon-molybdenum furnace. After the temperature of the silicon-molybdenum furnace rises to 1500℃, keep it warm. Then put the graphite crucible filled with slag into the furnace for melting. After melting, use a molybdenum rod to stir it evenly.

[0098] Step 3: Start the lifting mechanism in the crankshaft reciprocating device to slowly lower the refractory rod to above the liquid surface. After the temperature stabilizes, start the speed-regulating reciprocating motor and the speed-regulating controller in the crankshaft reciprocating device to make the refractory rod reciprocate up and down in the slag in the graphite crucible, thereby simulating the effect of the periodic rise and fall of the slag liquid level in contact with the RH insert tube in actual production on the erosion of the RH insert tube.

[0099] Step 4: After the refractory rod has been in the slag for 10 minutes, turn off the speed regulating reciprocating motor and the speed controller in the crankshaft reciprocating device, and then use the lifting mechanism to lift the refractory rod to about 20 mm above the furnace cover. Then take pictures of the refractory rod, record the macroscopic morphology of the refractory rod after being corroded by the slag to complete an RH insert tube erosion simulation experiment.

[0100] Step 5: After the refractory rod has cooled for 10 minutes, repeat the operation for the next simulation experiment. The same refractory rod is repeated 4 times to reflect the periodic change process of the insert tube descending into the slag and rising out of the slag when it is continuously used in multi-furnace ladle refining, so as to simulate the effect of changing conditions during multi-furnace ladle refining on the erosion of the insert tube. Figure 5 It is the macroscopic morphology of the erosion process of the refractory rod obtained by 5 shooting records. This figure reflects the macroscopic morphological changes of the refractory rods eroded by slag in the simulation process under the conditions of temperature and refractory material being the same as those in Example 1, using slag with a chemical composition different from that in Example 1, that is, with the increase in the number of uses and the extension of the erosion time, the refractory rods inserted in the slag also show a gradual thinning pattern due to slag erosion, but due to the different properties of the slag, the degree of erosion of the refractory rods is different. By recording the size changes of the refractory rods inserted into the slag each time, the macroscopic law of the erosion of the refractory rods by the slag can be obtained. This device fully considers the consistency of the simulated temperature, slag and refractory properties with the actual working conditions, and can ensure the accuracy of the simulation.

[0101] Step 6: After the refractory rods have cooled, sampling can be performed to obtain samples for studying the problem of insert tube erosion, providing basic conditions for subsequent more in-depth experimental analysis based on sample testing (such as phase detection, composition analysis, analysis of the reaction characteristics between the insert tube material and slag, and analysis of the cause and mechanism of insert tube erosion, etc.).

[0102] Step 7: Take out the graphite crucible containing the slag and air-cool it. Sampling is performed on the cooled slag to obtain a slag sample for research and analysis.

[0103] Step 8: Turn off the high temperature furnace and complete the experiment.

[0104] The above are only preferred embodiments of the present invention. It should be noted that the above preferred embodiments should not be regarded as limiting the present invention, and the protection scope of the present invention should be based on the scope defined by the claims. For ordinary technicians in this technical field, several improvements and modifications can be made without departing from the spirit and scope of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An experimental device for simulating RH insertion tube erosion, characterized in that: It includes a crankshaft reciprocating device (A), a high temperature melting device (B) and a refractory rod (9) simulating an RH insertion tube; The crankshaft reciprocating device (A) comprises: A crankshaft reciprocating mechanism (1), wherein the crankshaft reciprocating mechanism (1) is mounted on the lifting mechanism (8); The high temperature melting device (B) comprises: a temperature controller (17) and a high temperature furnace; One end of the refractory rod (9) simulating the RH insertion tube is connected to the crankshaft reciprocating mechanism (1), and the other end passes through the high-temperature furnace and enters the interior of the high-temperature furnace.

2. The experimental device according to claim 1, characterized in that: The crankshaft reciprocating device (1) comprises: The aluminum alloy base (5) is fixed to one side of the lifting mechanism (8) in parallel with the connecting piece surface and at a certain distance. A reciprocating mechanism rocker arm pull rod (2) has one end connected to a reciprocating motor (3) and the other end connected to a speed regulating telescopic rod (6), and the reciprocating mechanism rocker arm pull rod (2) and the telescopic rod (6) are located in a space between the aluminum alloy base and the lifting mechanism (8); The reciprocating motor (3) is located on the other side of the aluminum alloy base (5) relative to the lifting mechanism (8); and the motor output shaft is connected to the rocker arm pull rod (2) of the reciprocating mechanism; The speed controller (4) is electrically connected to the reciprocating motor (3) to control the output shaft speed of the reciprocating motor (3).

3. The experimental device according to claim 2, characterized in that: The movement mode of the reciprocating mechanism rocker arm pull rod (2) of the crankshaft reciprocating device (A) is a reciprocating cycle.

4. The experimental device according to claim 2, characterized in that: The lower part of the telescopic rod (6) is provided with a cylindrical connecting piece (7), through which the lower end of the telescopic rod is connected to the upper end of a refractory rod (9) simulating the RH insertion tube.

5. The experimental device according to claim 1, characterized in that: The high temperature furnace comprises: Furnace body (11); A furnace cover (10) is arranged above the furnace body; The furnace tube (12) is located in the furnace body. A base (16) is arranged at the bottom of the furnace tube (12), and a graphite crucible (13) is arranged on the base; The graphite crucible (13) contains slag (14), A thermocouple (18) heats the graphite crucible (13) via the base (16); One end of the refractory material rod (9) is located in the graphite crucible (13) and can move up and down, making relative movement with the slag (14).

6. The experimental device according to claim 5, characterized in that: The temperature controller (17) is connected to the thermocouple (18), and the high-temperature furnace is temperature-controlled via the temperature controller (17).

7. The experimental device according to claim 5, characterized in that: It also includes a silicon-molybdenum rod (15), which is arranged on the inner side of the furnace body (11) and the outer side of the furnace tube (12).

8. The experimental device according to claim 1, characterized in that: The lifting mechanism (8) is used to control the rising and falling movement of the refractory rod (9) simulating the RH insertion tube.

9. The experimental device according to claim 1, characterized in that: The refractory rod (9) simulating the RH insertion tube is a rod-shaped object determined according to the material of the RH insertion tube to be simulated, and the refractory material includes: amorphous casting material used for the RH insertion tube and a refractory material formed by coating.

10. The experimental device according to claim 9, characterized in that: The refractory material is selected from corundum refractory material, corundum-spinel refractory material, corundum-mullite refractory material and chromium-corundum refractory material.

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