Semi-solid pulping equipment and semi-solid pulping method
By designing a semi-solid pulping equipment including a sealed liquid storage tank, a gas-liquid mixing device and a negative pressure bubble removal device, the problems of uneven bubble distribution, local supercooling, and excessive oxide impurity content and gas content in the semi-solid pulping technology are solved, and a higher quality and stable semi-solid slurry production is achieved.
Patent Information
- Application Number
- CN202411717797.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-27
- Publication Date
- 2025-02-25
AI Technical Summary
In the existing semi-solid pulping technology, there are problems of uneven bubble distribution, local supercooling, and excessive oxide impurity content and gas content, which affects the quality of the slurry and the stability of the pulping process.
A semi-solid pulping equipment is designed, including a sealed liquid storage tank, a gas-liquid mixing device and a negative pressure bubble removal device. By optimizing the pulping process and equipment design, a more uniform bubble distribution is achieved, local supercooling is reduced, and oxide impurities and gas content are reduced.
Through this equipment and method, the quality of the semi-solid slurry and the stability of the pulping process can be significantly improved, ensuring crystal uniformity and bubble-free semi-solid slurry production.
Smart Images
Figure CN119499901A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of semi-solid forming, and in particular to a semi-solid pulping device and a semi-solid pulping method. Background Art
[0002] In the current field of semi-solid pulping technology, gas induced semi-solid pulping technology (GISS) as a cutting-edge method has shown its advantages in preparing refined semi-solid pulp. However, this technology still faces some challenges and problems in practical applications, which limit its wide application in industrial production.
[0003] Uneven distribution of bubbles: In GISS technology, inert gas is introduced into the alloy melt through a graphite rod to achieve the nucleation of the melt and the breakage of dendrites. However, since the vent holes on the graphite rods are of the same size and the gas flow rate is basically the same, more bubbles gather near the graphite rods, while fewer bubbles gather in the area away from the graphite rods. This uneven distribution of bubbles affects the formation of metal nuclei, which in turn leads to uneven distribution of nucleation points, affecting the uniformity of the slurry crystal structure.
[0004] Local overcooling problem: The heat exchange between the inner wall of the pulping container and the semi-solid pulp may cause local overcooling, which will cause uneven grain growth and affect the quality of the final product. Local overcooling may also cause thermal stability problems in the pulping process, increasing the complexity of the pulping process.
[0005] Problems with oxide impurity content and gas content: Although the traditional mechanical stirring method of pulping is highly efficient, it can easily lead to oxidation and air absorption when the alloy liquid is turned over in the pulper, increasing the oxide impurity content and gas content, thus affecting the quality of the die-casting products.
[0006] In view of the above problems, the present invention aims to propose a semi-solid pulping device and a semi-solid pulping method to solve the problems of uneven bubble distribution, local overcooling, and excessive oxide impurity content and gas content in the prior art. By optimizing the pulping process and equipment design, a more uniform bubble distribution is achieved, local overcooling is reduced, and the oxide impurity content and gas content are reduced, thereby improving the quality of the semi-solid slurry and the stability of the pulping process. Summary of the invention
[0007] The purpose of the present application is to provide a semi-solid pulping device and a semi-solid pulping method to solve the problems of uneven bubble distribution, local overcooling, and excessive oxide impurity content and gas content in the prior art. By optimizing the pulping process and equipment design, a more uniform bubble distribution is achieved, local overcooling is reduced, and the oxide impurity content and gas content are reduced, thereby improving the quality of the semi-solid slurry and the stability of the pulping process.
[0008] To achieve the above-mentioned purpose, an embodiment of the present application provides a semi-solid pulping equipment, including a sealed liquid storage tank with a liquid storage chamber, a gas-liquid mixing device and a negative pressure defoaming device; the liquid storage chamber is used to store molten metal, a first air inlet is arranged at the top of the sealed liquid storage tank, the first air inlet is connected to the liquid storage chamber and is used to supply inert gas to be injected into the liquid storage chamber, and a first liquid outlet is arranged at the bottom of the sealed liquid storage tank; the gas-liquid mixing device has a second air inlet, a first liquid inlet and a second liquid outlet, the first liquid inlet is connected to the first liquid outlet, the second air inlet is used to supply inert gas to enter the gas-liquid mixing device; the negative pressure defoaming device The device is connected to the second liquid outlet; wherein, the sealed liquid storage tank, the gas-liquid mixing device and the negative pressure debubbling device are all provided with a thermal insulation coating, and when the inert gas is injected into the liquid storage cavity through the first air inlet, the molten metal stored in the liquid storage cavity is pressed out of the liquid storage cavity and flows into the gas-liquid mixing device, and the molten metal flowing into the gas-liquid mixing device is mixed with the inert gas flowing into the gas-liquid mixing device to produce a semi-solid slurry with uniform crystals, and flows into the negative pressure debubbling device from the second liquid outlet, and the negative pressure debubbling device removes bubbles in the semi-solid slurry by the action of negative pressure to produce a semi-solid slurry with uniform crystals without bubbles.
[0009] In some embodiments of the present application, the first air inlet is further connected to an airflow control valve, and the airflow control valve is connected to the liquid storage chamber via the first air inlet to control the flow rate of the inert gas entering the liquid storage chamber.
[0010] In some embodiments of the present application, a first liquid flow valve is further provided between the first liquid outlet and the first liquid inlet, and the first liquid flow valve is used to control the flow rate of the metal solution entering the first liquid outlet from the first liquid outlet.
[0011] In some embodiments of the present application, a second liquid inlet is further provided at the bottom end of the sealed liquid storage tank, the second liquid inlet is connected to the liquid storage cavity, and the second liquid inlet is used to supply molten metal to enter the liquid storage cavity.
[0012] In some embodiments of the present application, the second liquid inlet is connected to a second liquid flow valve, and the second liquid flow valve is connected to the liquid storage chamber via the second liquid inlet to control the flow rate of the molten metal entering the liquid storage chamber.
[0013] In some embodiments of the present application, the gas-liquid mixing device includes a Venturi nozzle and a turbulent mixer, and the turbulent mixer includes a tank body, an intermediate column and a protruding block; the intermediate column is arranged in the tank body, and the intermediate column and the inner side wall of the tank body jointly enclose a descending flow channel, the protruding block is located between the inner side wall of the tank body and the intermediate column, and a plurality of protruding blocks are arranged at intervals along the height direction of the tank body, and are alternately fixed to the intermediate column and the inner wall of the tank body to form a descending flow channel that turns downward along the height direction of the tank body, the first liquid inlet is located at one end of the Venturi nozzle, and the protruding block is located between the inner side wall of the tank body and the intermediate column. The other end of the venturi nozzle is connected to the top of the tank body and communicated with the tank body, the second air inlet is a venturi air port opened on the side of the venturi nozzle, and the second liquid outlet is arranged at the bottom end of the tank body; wherein, the molten metal flowing into one end of the venturi nozzle from the first liquid outlet, in the process of flowing to the other end of the venturi nozzle, sucks the inert gas in the venturi air port into the venturi nozzle, and flows into the tank body along with the molten metal, generates turbulence in the process of descending in the descending flow channel, thereby generating a semi-solid slurry with uniform crystals, and flows out from the second liquid outlet.
[0014] In some embodiments of the present application, a plurality of the raised blocks are arranged around the middle column, and the Venturi nozzle is installed in a cut-in manner on the tank body, so that the molten metal and inert gas injected into the tank body by the Venturi nozzle enter the tank body along the inner wall of the tank body.
[0015] In some embodiments of the present application, the Venturi nozzle is arranged to be tilted upward along the height direction of the tank body, and a plurality of the Venturi nozzles are arranged at intervals around the tank body.
[0016] In some embodiments of the present application, the top end of the intermediate column is connected to the tank body, and the connection between the two forms an irregular wave shape; the bottom of the inner wall of the tank body forms an irregular wave shape.
[0017] To achieve the above object, the present application also provides a semi-solid pulping method using the semi-solid pulping device of any of the above embodiments, characterized in that it includes the following steps: Inert gas at 5-10°C and 0.5-1MPa above the liquidus line of the metal solution is injected into the liquid storage cavity of the sealed liquid storage tank through the first gas inlet, so that the molten metal stored in the liquid storage cavity is pressed out of the liquid storage cavity and flows into the gas-liquid mixing device; The molten metal in the gas-liquid mixing device is kept above the liquidus line at 20°C, and an inert gas at 20-30°C is connected to the second air inlet of the gas-liquid mixing device, so that the molten metal flowing into the gas-liquid mixing device is mixed with the inert gas flowing into the gas-liquid mixing device to produce a semi-solid slurry with uniform grains, and flows into the negative pressure debubbling device from the second liquid outlet. The negative pressure debubbling device removes bubbles in the semi-solid slurry through the action of negative pressure to produce a bubble-free, crystal-uniform semi-solid slurry.
[0018] Compared with the prior art, the semi-solid pulping equipment of the embodiment of the present application includes a sealed liquid storage tank with a liquid storage cavity and a gas-liquid mixing device; the liquid storage cavity is used to store molten metal, a first air inlet is arranged at the top of the sealed liquid storage tank, the first air inlet is connected with the liquid storage cavity, and is used to supply inert gas to be injected into the liquid storage cavity, and a first liquid outlet is arranged at the bottom of the sealed liquid storage tank; the gas-liquid mixing device has a second air inlet, a first liquid inlet and a second liquid outlet, the first liquid inlet is connected with the first liquid outlet, the second air inlet is used to supply inert gas to enter the gas-liquid mixing device, and a thermal insulation coating is arranged in the sealed liquid storage tank, the gas-liquid mixing device and the negative pressure defoaming device, so as to protect the sealed liquid storage tank, the gas-liquid mixing device and the negative pressure defoaming device. The molten metal in the mixing device and the negative pressure debubbling device is insulated to avoid excessive heat exchange between the inner wall and the semi-solid slurry; when the inert gas is injected into the liquid storage chamber, the molten metal stored in the liquid storage chamber is pressed out of the liquid storage chamber and flows into the gas-liquid mixing device, and the molten metal flowing into the gas-liquid mixing device is mixed with the inert gas flowing into the gas-liquid mixing device to produce a semi-solid slurry with uniform crystals, and flows into the negative pressure debubbling device from the second liquid outlet, and the negative pressure debubbling device removes bubbles in the semi-solid slurry by negative pressure to produce a semi-solid slurry with uniform crystals without bubbles, thereby avoiding uneven bubble distribution, local overcooling, and excessive oxide impurity content and gas content.
[0019] In addition, since the semi-solid pulping method of the embodiment of the present application uses the above-mentioned semi-solid pulping equipment to prepare semi-solid slurry, and the semi-solid pulping method of the embodiment of the present application includes the following steps: injecting an inert gas of 0.5-1MPa and 5-10°C above the liquidus line of the metal solution into the liquid storage cavity of the sealed liquid storage tank through the first air inlet, so that the molten metal stored in the liquid storage cavity is pressed out of the liquid storage cavity and flows into the gas-liquid mixing device; keeping the molten metal in the gas-liquid mixing device above the liquidus line by 20°C, and injecting 20-30°C of inert gas into the liquid storage cavity; The inert gas is connected to the second air inlet of the gas-liquid mixing device so that the molten metal flowing into the gas-liquid mixing device is mixed with the inert gas flowing into the gas-liquid mixing device to produce a semi-solid slurry with uniform grains, and flows into the negative pressure debubbling device from the second liquid outlet. The negative pressure debubbling device removes bubbles in the semi-solid slurry through the action of negative pressure to produce a bubble-free semi-solid slurry with uniform crystals, thereby avoiding uneven bubble distribution, local overcooling, and excessive oxide impurity content and gas content, thereby ensuring that the prepared semi-solid slurry has uniform grains. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the semi-solid pulping equipment according to an embodiment of the present application.
[0022] Figure 2 for Figure 1 Schematic diagram of the internal structure of the sealed liquid storage tank in the semi-solid pulping equipment shown.
[0023] Figure 3 for Figure 1 Schematic diagram of the internal structure of the gas-liquid mixing device in the semi-solid pulping equipment shown.
[0024] Figure 4 for Figure 3 Schematic diagram of the internal structure of the Venturi nozzle in the gas-liquid mixing device shown.
[0025] Figure 5 This is a metallographic diagram of a casting prepared by a semi-solid pulping method using the semi-solid pulping equipment of an embodiment of the present application. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0027] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0028] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.
[0029] First of all, in the description of the embodiments of the present application, it needs to be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.
[0030] Secondly, the terms "first", "second", "third", etc. are only used to distinguish descriptions, without any distinction of order or importance, and cannot be understood as indicating or implying relative importance. The characteristics specified as "first" or "second" may explicitly or implicitly include one or more of such characteristics.
[0031] Furthermore, the terms "horizontal" and "vertical" do not mean that the components must be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted; the term "along a certain direction" does not mean that it must be absolutely parallel to the direction, but can be offset, that is, it only needs to have a component in the direction.
[0032] In addition, in the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, an electromagnetic connection, or even a communication connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0033] In addition, the “and / or” in this application, such as “Feature 1 and / or Feature 2”, refers to the three cases that it can be “Feature 1” alone, “Feature 2” alone, or “Feature 1” plus “Feature 2”. The “and / or” in this application, such as “Feature 1 and / or Feature 2”, refers to the three cases that it can be “Feature 1” alone, “Feature 2” alone, or “Feature 1” plus “Feature 2”.
[0034] like Figure 1-4As shown, the semi-solid pulping equipment 100 of the embodiment of the present application includes a sealed liquid storage tank 110 with a liquid storage chamber 110a and a gas-liquid mixing device 120; the liquid storage chamber 110a is used to store molten metal, and a first air inlet 110b is arranged at the top of the sealed liquid storage tank 110, the first air inlet 110b is connected to the liquid storage chamber 110a, and is used to supply high-temperature and high-pressure inert gas to the liquid storage chamber 110a, and a first liquid outlet 110c is arranged at the bottom of the sealed liquid storage tank 110; the gas-liquid mixing device 120 has a second air inlet 120a, a first liquid inlet 120b and a second liquid outlet 120c, and the first liquid inlet 120b and the first liquid outlet 110c are connected. The second air inlet 120a is connected to the gas-liquid mixing device 120, and is used to supply low-temperature inert gas to enter the gas-liquid mixing device 120; thereby, when the high-temperature and high-pressure inert gas is injected into the liquid storage chamber 110a, the molten metal stored in the liquid storage chamber 110a is pressed out of the liquid storage chamber 110a and flows into the gas-liquid mixing device 120, and the molten metal flowing into the gas-liquid mixing device 120 is mixed with the low-temperature inert gas flowing into the gas-liquid mixing device 120 to produce a semi-solid slurry with uniform crystals, and flows into the negative pressure debubbling device 130 from the second liquid outlet 120c, and the negative pressure debubbling device 130 removes bubbles in the semi-solid slurry by the negative pressure to produce a semi-solid slurry with uniform crystals without bubbles.
[0035] In the semi-solid pulping equipment 100 of the embodiment of the present application, the sealed liquid storage tank 110, the gas-liquid mixing device 120 and the negative pressure degassing device 130 are all provided with a heat insulation coating to avoid local overcooling caused by heat exchange between the inner wall and the semi-solid slurry, thereby avoiding uneven grain growth and affecting the quality of the final product. More specifically, as follows: like Figure 1-4 As shown, the first air inlet 110b is also connected to an air flow control valve 140, which is connected to the liquid storage chamber 110a through the first air inlet 110b to control the flow rate of the high-temperature and high-pressure inert gas entering the liquid storage chamber 110a.
[0036] like Figure 1-4 As shown, a first liquid flow valve 150 is further disposed between the first liquid outlet 110c and the first liquid inlet 120b to control the flow rate of the metal solution entering the first liquid inlet 120b from the first liquid outlet 110c.
[0037] like Figure 1-4 As shown, a second liquid inlet 110d is further provided at the bottom end of the sealed liquid storage tank 110, and the second liquid inlet 110d is communicated with the liquid storage cavity 110a so as to supply molten metal into the liquid storage cavity 110a.
[0038] like Figure 1-4As shown, the second liquid inlet 110d is connected to the second liquid flow valve 160, and the second liquid flow valve 160 is connected to the liquid storage chamber 110a through the second liquid inlet 110d to control the flow rate of the molten metal entering the liquid storage chamber 110a.
[0039] like Figure 1-4 As shown, the gas-liquid mixing device 120 includes a venturi nozzle 121 and a turbulent mixer 122, and the turbulent mixer 122 includes a tank body 1221, an intermediate column 1222 and a protruding block 1223; the intermediate column 1222 is arranged in the tank body 1221, and the intermediate column 1222 and the inner side wall of the tank body 1221 jointly enclose a descending flow channel 122a, the protruding block 1223 is located between the inner side wall of the tank body 1221 and the intermediate column 1222, and a plurality of protruding blocks 1223 are arranged at intervals along the height direction of the tank body 1221, and are alternately fixed to the intermediate column 1222 and the inner wall of the tank body 1221 to form a descending flow channel 122a that turns downward along the height direction of the tank body 1221, the first liquid inlet 120b is located at one end of the venturi nozzle 121, and the venturi nozzle 121 is provided with a plurality of protruding blocks 1223. The other end of the inner nozzle 121 is connected to the top of the tank body 1221 and communicates with the tank body 1221. The second air inlet 120a is a Venturi air port opened on the side of the Venturi nozzle 121. The second liquid outlet 120c is arranged at the bottom end of the tank body 1221. The molten metal flowing into one end of the Venturi nozzle 121 from the first liquid outlet 110c, in the process of flowing to the other end of the Venturi nozzle 121 at high speed, sucks the inert gas of normal temperature and pressure in the Venturi air port into the Venturi nozzle 121, and flows into the tank body 1221 along with the molten metal, generates turbulence of the gas-liquid mixture in the process of descending in the descending channel 122a, thereby producing a semi-solid slurry with uniform crystals, and flows into the negative pressure defoaming device 130 from the second liquid outlet 120c.
[0040] like Figure 1-4 As shown, a plurality of raised blocks 1223 are arranged around the middle column 1222, and the venturi nozzle 121 is installed in a cut-in manner on the tank body 1221, so that the molten metal and inert gas injected into the tank body 1221 by the venturi nozzle 121 enter the tank body 1221 along the inner wall of the tank body 1221, so as to further increase the turbulence of the gas-liquid mixture generated in the descending process of the molten metal in the descending channel 122a.
[0041] like Figure 1-4 As shown, the venturi nozzle 121 is arranged to be tilted upward along the height direction of the tank body 1221, and a plurality of venturi nozzles 121 are arranged at intervals around the tank body 1221 to form more turbulent flows of the gas-liquid mixture.
[0042] like Figure 1-4As shown, the top of the middle column 1222 is connected to the tank body 1221, and the connection between the two is an irregular wave shape so that the gas-liquid mixture generates more turbulence here; the bottom of the inner wall of the tank body 1221 is an irregular wave shape so that the gas-liquid mixture generates more turbulence here.
[0043] The semi-solid pulping method of the embodiment of the present application is performed using the semi-solid pulping device 100 of the embodiment of the present application, and includes the following steps: Inert gas at 5-10°C and 0.5-1MPa above the liquidus line of the metal solution is injected into the liquid storage chamber 110a of the sealed liquid storage tank 110 through the first gas inlet 110b, so that the molten metal stored in the liquid storage chamber 110a is pressed out of the liquid storage chamber 110a and flows into the gas-liquid mixing device 120; The molten metal in the gas-liquid mixing device 120 is kept above the liquidus line at 20°C, and an inert gas at 20-30°C is connected to the second air inlet 120a of the gas-liquid mixing device 120, so that the molten metal flowing into the gas-liquid mixing device 120 is mixed with the 20-30°C inert gas flowing into the gas-liquid mixing device 120 to produce a crystalline uniform semi-solid slurry, and then flows into the negative pressure debubbling device 130 from the second liquid outlet 120c. The negative pressure debubbling device 130 removes bubbles in the semi-solid slurry by the action of negative pressure to produce a bubble-free, crystalline uniform semi-solid slurry.
[0044] The inert gas at 20-30° C. is generally 0.09-0.11 MPa, preferably 0.1 MPa.
[0045] It should be particularly pointed out that in the semi-solid pulping equipment 100 and the semi-solid pulping method of the embodiment of the present application, the molten metal enters the gas-liquid mixing device 120 and absorbs 20-30°C inert gas into it to form a gas-liquid mixture. The gas-liquid mixture undergoes heat exchange and shearing during the flow in the gas-liquid mixing device 120, and the flow rate of the gas-liquid mixture changes rapidly through the pipeline design, that is, more turbulence is generated, thereby enhancing heat exchange and shear force. The molten metal in the gas-liquid mixture can nucleate around the inert gas to produce refined crystals. Compared with the traditional GISS pulping equipment's method of bubbling gas into the liquid, on the one hand, the solution of the present application allows the gas to be evenly distributed in the liquid, without having to worry about the problem of solution splashing due to too fast a gas flow rate, or the problem of bubbles not being evenly distributed due to too low a gas flow rate; on the other hand, the temperature of the liquid inside the pulping container can be controlled at above 20°C of the liquidus line, without having to worry about local crystal coarsening due to heat exchange between the liquid and the pulping container; on the other hand, semi-solid slurry can be prepared instantly; in addition, the gas flow rate and pressure can be controlled to separate the bubbles from the liquid portion in the gas-liquid mixture, and the bubbles can be further removed by the negative pressure action of the negative pressure debubbling device 130.
[0046] like Figure 1 As shown, a flow divider 170 is disposed between the first liquid outlet 110 c and the first liquid inlet 120 b to achieve connection between the first liquid outlet 110 c and the plurality of venturi nozzles 121 .
[0047] like Figure 1 As shown, the second air inlet 120a of the venturi nozzle 121 is connected to an inert gas storage tank 180 to provide the venturi nozzle 121 with an inert gas at 20-30°C. Figure 4 As shown, the venturi nozzle 121 is provided with a plurality of venturi channel-shaped second air inlets 120a.
[0048] like Figure 5 As described above, it can be seen that the grains in the casting are uniformly equiaxed, which means that the present embodiment can produce a semi-solid slurry with uniform crystal cores.
[0049] It should be noted that in the present application, high temperature and high pressure inert gas refers to inert gas at 5-10°C and 0.5-1MPa above the liquidus of the metal solution; inert gas at normal temperature and pressure refers to inert gas at 0.09-0.11MPa and 20-30°C, but is not limited to this.
[0050] Compared with the prior art, the semi-solid pulping equipment 100 of the embodiment of the present application includes a sealed liquid storage tank 110 with a liquid storage chamber 110a and a gas-liquid mixing device 120; the liquid storage chamber 110a is used to store molten metal, and a first air inlet 110b is provided at the top of the sealed liquid storage tank 110, the first air inlet 110b is connected to the liquid storage chamber 110a, and is used to supply high-temperature and high-pressure inert gas to be injected into the liquid storage chamber 110a, and a first liquid outlet 110c is provided at the bottom of the sealed liquid storage tank 110; the gas-liquid mixing device 120 has a second air inlet 120a, a first liquid inlet 120b and a second liquid outlet 120c, the first liquid inlet 120b is connected to the first liquid outlet 110c, the second air inlet 120a is used to supply 20-30°C inert gas to enter the gas-liquid mixing device 120, and both the sealed liquid storage tank 110 and the gas-liquid mixing device 120 are A heat-insulating coating is provided to insulate the molten metal in the sealed liquid storage tank 110, the gas-liquid mixing device 120 and the negative pressure debubbling device 130, so as to avoid excessive heat exchange between the inner wall and the semi-solid slurry; when the high-temperature and high-pressure inert gas is injected into the liquid storage chamber 110a, the molten metal stored in the liquid storage chamber 110a is pressed out of the liquid storage chamber 110a and flows into the gas-liquid mixing device 120, and the molten metal flowing into the gas-liquid mixing device 120 is mixed with the inert gas at room temperature and pressure flowing into the gas-liquid mixing device 120 to produce a semi-solid slurry with uniform crystals, and flows into the negative pressure debubbling device 130 from the second liquid outlet 120c, and the negative pressure debubbling device 130 removes the bubbles in the semi-solid slurry by the negative pressure to produce a bubble-free, crystal-uniform semi-solid slurry, thereby avoiding uneven bubble distribution, local overcooling, and excessive oxide impurity content and gas content.
[0051] In addition, since the semi-solid pulping method of the embodiment of the present application uses the above-mentioned semi-solid pulping equipment 100 to prepare semi-solid slurry, and the semi-solid pulping method of the embodiment of the present application includes the following steps: injecting an inert gas of 0.5-1MPa at 5-10°C above the liquidus line of the metal solution into the liquid storage chamber 110a of the sealed liquid storage tank 110 through the first gas inlet 110b, so that the molten metal stored in the liquid storage chamber 110a is pressed out of the liquid storage chamber 110a and flows into the gas-liquid mixing device 120; keeping the molten metal in the gas-liquid mixing device 120 above the liquidus line by 20°C, and mixing the molten metal in the gas-liquid mixing device 120 by 20-3 The 0°C inert gas is connected to the second air inlet 120a of the gas-liquid mixing device 120, so that the molten metal flowing into the gas-liquid mixing device 120 is mixed with the 20-30°C inert gas flowing into the gas-liquid mixing device 120 to produce a semi-solid slurry with uniform crystals, and flows into the negative pressure debubbling device 130 from the second liquid outlet 120c. The negative pressure debubbling device 130 removes bubbles in the semi-solid slurry through the negative pressure to produce a bubble-free, crystal-uniform semi-solid slurry, thereby avoiding uneven bubble distribution, local overcooling, and excessive oxide impurity content and gas content, thereby ensuring crystal uniformity.
[0052] The above disclosure is only a preferred example of the present application, and its role is to facilitate the technical personnel in this field to understand and implement it, but it cannot be used to limit the scope of rights of the present application. Therefore, equivalent changes made within the scope recorded in this application still fall within the scope covered by this application.
Claims
1. A semi-solid pulping device, characterized in that: include: A sealed liquid storage tank having a liquid storage cavity, the liquid storage cavity being used to store molten metal, a first air inlet being provided at the top of the sealed liquid storage tank, the first air inlet being communicated with the liquid storage cavity and being used to supply inert gas to inject into the liquid storage cavity, and a first liquid outlet being provided at the bottom of the sealed liquid storage tank; A gas-liquid mixing device, the gas-liquid mixing device having a second gas inlet, a first liquid inlet and a second liquid outlet, the first liquid inlet is connected to the first liquid outlet, and the first gas inlet is used to supply inert gas to enter the gas-liquid mixing device; as well as A negative pressure debubbling device, the negative pressure debubbling device is connected to the second liquid outlet; Among them, the sealed liquid storage tank, the gas-liquid mixing device and the negative pressure debubbling device are all provided with a thermal insulation coating. When the inert gas is injected into the liquid storage cavity through the first air inlet, the molten metal stored in the liquid storage cavity is pressed out of the liquid storage cavity and flows into the gas-liquid mixing device. The molten metal flowing into the gas-liquid mixing device is mixed with the inert gas flowing into the gas-liquid mixing device to produce a semi-solid slurry with uniform crystals, and flows into the negative pressure debubbling device from the second liquid outlet. The negative pressure debubbling device removes bubbles in the semi-solid slurry through the action of negative pressure to produce a semi-solid slurry with uniform crystals without bubbles.
2. The semi-solid pulping equipment according to claim 1, characterized in that: The first air inlet is also connected to an air flow control valve, and the air flow control valve is connected to the liquid storage chamber through the first air inlet to control the flow rate of the inert gas entering the liquid storage chamber.
3. The semi-solid pulping equipment according to claim 1, characterized in that: A first liquid flow valve is further provided between the first liquid outlet and the first liquid inlet, for controlling the flow rate of the metal solution entering the first liquid outlet from the first liquid outlet.
4. The semi-solid pulping equipment according to claim 1, characterized in that: The bottom end of the sealed liquid storage tank is also provided with a second liquid inlet, the second liquid inlet is communicated with the liquid storage cavity, and the second liquid inlet is used for supplying molten metal into the liquid storage cavity.
5. The semi-solid pulping equipment according to claim 4, characterized in that: The second liquid inlet is connected to a second liquid flow valve, and the second liquid flow valve is communicated with the liquid storage chamber via the second liquid inlet, so as to control the flow rate of the molten metal entering the liquid storage chamber.
6. The semi-solid pulping equipment according to claim 1, characterized in that: The gas-liquid mixing device comprises a venturi nozzle and a turbulent mixer, and the turbulent mixer comprises a tank body, an intermediate column and a protruding block. The intermediate cylinder is arranged in the tank body, and the intermediate cylinder and the inner wall of the tank body jointly enclose a descending flow channel, the protruding block is located between the inner wall of the tank body and the intermediate cylinder, and a plurality of protruding blocks are arranged at intervals along the height direction of the tank body, and are alternately fixed to the intermediate cylinder and the inner wall of the tank body to form a descending flow channel that turns downward along the height direction of the tank body, the first liquid inlet is located at one end of the Venturi nozzle, and the other end of the Venturi nozzle is connected to the top of the tank body and communicates with the tank body, the second air inlet is a Venturi air port opened on the side of the Venturi nozzle, and the second liquid outlet is arranged at the bottom end of the tank body; The molten metal flowing into one end of the venturi nozzle from the first liquid outlet absorbs the inert gas in the venturi gas port into the venturi nozzle during the process of flowing toward the other end of the venturi nozzle, and flows into the tank body along with the molten metal, generating turbulence during the descending process in the descending flow channel, thereby producing a semi-solid slurry with uniform crystals, and flowing out from the second liquid outlet.
7. The semi-solid pulping equipment according to claim 6, characterized in that: A plurality of the raised blocks are arranged around the middle column, and the venturi nozzle is installed in the tank body in a cut-in manner, so that the molten metal and the inert gas injected into the tank body by the venturi nozzle enter the tank body along the inner wall of the tank body.
8. The semi-solid pulping equipment according to claim 6, characterized in that: The venturi nozzle is arranged to be inclined upward along the height direction of the tank body, and a plurality of venturi nozzles are arranged at intervals around the tank body.
9. The semi-solid pulping equipment according to claim 6, characterized in that: The top end of the intermediate column is connected to the tank body, and the connection between the two forms an irregular wave shape; the bottom of the inner wall of the tank body forms an irregular wave shape.
10. A semi-solid pulping method using the semi-solid pulping equipment according to any one of claims 1 to 9, characterized in that: The following steps are involved: Injecting an inert gas at 5-10°C and 0.5-1MPa above the liquidus line of the metal solution into the liquid storage cavity of the sealed liquid storage tank through the first gas inlet, so that the molten metal stored in the liquid storage cavity is pressed out of the liquid storage cavity and flows into the gas-liquid mixing device; The molten metal in the gas-liquid mixing device is maintained at above the liquidus line at 20°C, and an inert gas at 20-30°C is connected to the second air inlet of the gas-liquid mixing device, so that the molten metal flowing into the gas-liquid mixing device is mixed with the inert gas flowing into the gas-liquid mixing device to produce a semi-solid slurry with uniform grains, and flows into the negative pressure debubbling device from the second liquid outlet. The negative pressure debubbling device removes bubbles in the semi-solid slurry through the action of negative pressure to produce a bubble-free, crystal-uniform semi-solid slurry.