Apparatus and method for preparing flux for aluminum and aluminum alloy

Abstract

This invention relates to the field of aluminum alloy purification flux technology, and particularly to an apparatus and method for preparing flux for aluminum and aluminum alloys. The preparation apparatus is characterized by comprising: a furnace body having a receiving space and an opening; a furnace cover detachably installed at the opening of the furnace body; a heating element disposed outside the furnace body for heating the raw materials inside the furnace body; and a vent pipe with a filter screen, configured to: evacuate the furnace body before the heating step and expel hydrochloric acid gas from the furnace body during the heating step. When using the preparation apparatus of this invention to prepare flux for aluminum and aluminum alloys, damage to the furnace body from corrosive hydrochloric acid gas can be effectively prevented, thereby extending the furnace body's service life. Furthermore, the flux prepared using the preparation apparatus of this invention has a low magnesium oxide content, significantly improving the quality of the finished flux product and ensuring the refining effect of aluminum and aluminum alloys.

Description

Technical Field

[0001] This invention relates to the field of aluminum alloy purification flux technology, and in particular to a preparation apparatus and method for a flux for aluminum and aluminum alloys. Background Technology

[0002] Currently, during the smelting of aluminum and aluminum alloys, the molten aluminum and aluminum alloy readily react with moisture in the air, producing impurities such as hydrogen and oxides. The raw and auxiliary materials added during smelting also contribute harmful elements such as alkali metals to the melt, significantly impacting the quality of aluminum products. Therefore, fluxes with NaCl-MgCl2-KCl as their main components are used for refining during the aluminum and aluminum alloy casting process to remove impurities such as hydrogen, oxides, and alkali metals. However, these fluxes are prone to corrosion reactions with equipment during preparation. The magnesium chloride component in the flux readily reacts with water in the air to form crystalline hydrates, generating magnesium oxide and hydrochloric acid corrosive gases during preparation. These crystalline hydrates not only significantly affect the effectiveness of the fluxes used for aluminum and aluminum alloys but also reduce the lifespan of the equipment. Summary of the Invention

[0003] The purpose of this invention is to provide an apparatus and method for preparing low-magnesium oxide flux for aluminum and aluminum alloys, so as to at least solve the technical problem in the prior art that the flux is prone to corrosion reaction with the equipment during the preparation process, so as to improve the use effect of the flux and the service life of the equipment.

[0004] To at least solve the above-mentioned technical problems, the present invention provides the following technical solution: An apparatus for preparing flux for aluminum and aluminum alloys, comprising: The furnace body has a receiving space inside and an opening is provided on the furnace body; A furnace cover, which is detachably installed at the opening of the furnace body; A heating element is disposed outside the furnace body and is used to heat the raw materials inside the furnace body; A vent pipe is provided with a filter screen. The vent pipe is configured to: evacuate the furnace body before the heating step and discharge the hydrochloric acid gas inside the furnace body during the heating step.

[0005] Optionally, the flux preparation apparatus further includes a sealing ring, which is annular and disposed between the furnace body and the furnace cover.

[0006] Optionally, a cooling ring is fixedly provided at the open end of the furnace body. The cooling ring is used to install the sealing ring. The cooling ring has an annular cavity inside and is provided with an inlet and an outlet for injecting circulating coolant into the cooling ring to cool the sealing ring.

[0007] Optionally, the vent pipe is located at the top of the furnace body and communicates with the interior of the furnace body; and A first hygrometer is installed on the top of the furnace body and / or the furnace cover, and a second hygrometer is installed on the ventilation pipe.

[0008] The present invention also provides a method for preparing flux for aluminum and aluminum alloys, wherein the preparation process of the flux for aluminum and aluminum alloys uses the preparation apparatus as described in any of the above claims, and the preparation method includes: Pretreatment step: After drying the raw materials, add them to the furnace body and mix them evenly; Vacuuming step: Seal the furnace cover onto the furnace body, connect the vent pipe to the vacuum pump, and perform vacuuming on the furnace body; Heating step: The raw material in the furnace is heated by the heating element, and the hydrochloric acid gas in the furnace is discharged through the vent pipe to obtain liquid flux.

[0009] Optionally, the preparation method further includes: Crushing step: In response to the end of the heating step, after the liquid flux solidifies into solid flux, the solid flux is crushed to obtain the flux product, wherein the particle size of the flux product is 2~5mm and the magnesium oxide content in the flux product is less than 0.5%.

[0010] Optionally, the preparation process of the flux for aluminum and aluminum alloys uses the preparation apparatus described in any of the above-mentioned embodiments; and The vacuuming step also includes: Circulating coolant is injected into the cooling ring, and the humidity at the top of the furnace measured by the first hygrometer and the humidity of the exhaust gas measured by the second hygrometer are obtained simultaneously; wherein, the temperature of the coolant is cooling water at 10~20℃.

[0011] Optionally, the preparation method further includes: Determine whether the humidity at the furnace top is greater than the humidity at the exhaust gas level; If so, the operating power of the vacuum pump is reduced to a first preset value; or If not, the operating power of the vacuum pump will be increased to the second preset value.

[0012] Optionally, in response to the furnace top humidity being greater than the exhaust humidity and the duration being not less than a preset duration, the working power of the vacuum pump is intermittently adjusted with a third preset value and a first preset value to form turbulence at the inlet of the vent pipe; the third preset value is between the first preset value and the second preset value.

[0013] Optionally, the raw material comprises, by mass percentage: KCl: 39-61%, MgCl2: 39-61%; or The raw materials, by mass percentage, include: NaCl: 39-61%, MgCl2: 39-61%; In the heating step, the heating temperature is 550~600℃, and the heating time required for each ton of the raw material is 4~6 hours; After the vacuuming step is completed, the vacuum level inside the furnace is 5~20 Pa.

[0014] When using the preparation apparatus of the present invention to prepare flux for aluminum and aluminum alloys, damage to the furnace body caused by hydrochloric acid corrosive gases can be effectively prevented, thereby extending the service life of the furnace body. Furthermore, the flux prepared using the preparation apparatus of the present invention has a low magnesium oxide content, significantly improving the quality of the finished flux and thus ensuring the refining effect of aluminum and aluminum alloys.

[0015] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0016] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings: Figure 1 This is a schematic front view of an apparatus for preparing flux for aluminum and aluminum alloys according to an embodiment of the present invention; Figure 2 This is a schematic left view of an apparatus for preparing flux for aluminum and aluminum alloys according to an embodiment of the present invention; Figure 3 This is a schematic top view of an apparatus for preparing flux for aluminum and aluminum alloys according to an embodiment of the present invention; Figure 4 This is a schematic flowchart of a method for preparing flux for aluminum and aluminum alloys according to an embodiment of the present invention; Figure 5 This is a schematic flowchart illustrating a method for preparing flux for aluminum and aluminum alloys according to an embodiment of the present invention. Detailed Implementation

[0017] The following reference Figures 1 to 5This invention describes an apparatus and method for preparing flux for aluminum and aluminum alloys according to embodiments of the present invention. The terms "front," "rear," "upper," "lower," "top," "bottom," "inner," "outer," and "lateral," etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings. They are used solely for the purpose of facilitating and simplifying the description of the invention, and do not indicate or imply that the apparatus or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0018] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first," "second," etc., may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically stated, this indicates that other features are not excluded and may be further included.

[0019] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," and "coupling," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0020] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0021] Figure 1 This is a schematic structural diagram of the apparatus for preparing flux for aluminum and aluminum alloys according to this application, as shown below. Figure 1 As shown, and refer to Figures 2 to 3 This invention provides an apparatus for preparing flux for aluminum and aluminum alloys, the apparatus comprising a furnace body 10, a furnace cover 20, a heating element and a vent pipe 50.

[0022] The furnace body 10 has an internal space and an opening. The furnace cover 20 is detachably installed at the opening of the furnace body 10. The heating element is located outside the furnace body 10 and is used to heat the raw materials inside the furnace body 10. A filter screen is provided at the vent pipe 50. The vent pipe 50 is configured to: evacuate the furnace body 10 before the heating step and discharge the hydrochloric acid gas inside the furnace body 10 during the heating step.

[0023] Specifically, the filter separates the raw material from the gas, which is air and / or hydrochloric acid gas.

[0024] In this embodiment, during use, the furnace cover 20 is first opened, and the raw material is added into the furnace body 10 through the opening. Then, the furnace cover 20 is placed over the opening of the furnace body 10 to seal the furnace body 10. Next, the air inside the furnace body 10 is extracted through the vent pipe 50 to obtain a vacuum environment. Then, the raw material inside the furnace body 10 is heated by the heating element. The raw material reacts in a vacuum environment, which can effectively prevent the magnesium chloride in the raw material from reacting with the moisture in the air. The amount of magnesium oxide and hydrochloric acid corrosive gas generated during the preparation process is small, thereby reducing the magnesium oxide content in the flux product. In addition, during the heating process, the hydrochloric acid gas inside the furnace body 10 is discharged through the vent pipe 50, which can prevent the hydrochloric acid corrosive gas from damaging the furnace body 10.

[0025] Therefore, when using the preparation apparatus of the present invention to prepare flux for aluminum and aluminum alloys, damage to the furnace body 10 caused by hydrochloric acid corrosive gas can be effectively prevented, thereby enabling the furnace body 10 to have a longer service life. Furthermore, the flux prepared using the preparation apparatus of the present invention has a low magnesium oxide content, which greatly improves the quality of the finished flux product, thus ensuring the refining effect of aluminum and aluminum alloys.

[0026] In some optional embodiments of the present invention, the vent pipe 50 is disposed on the furnace body 10 and communicates with the interior of the furnace body 10. In some alternative embodiments of the present invention, the vent pipe 50 is disposed on the furnace cover 20.

[0027] Preferably, in some optional embodiments of the present invention, the vent pipe 50 is disposed on the upper part of the furnace body 10.

[0028] In this embodiment, the above-mentioned arrangement is more conducive to the discharge of gas from the furnace body 10.

[0029] More preferably, in some optional embodiments of the present invention, the ventilator 50 is horizontally arranged. In other optional embodiments, the ventilator 50 may also be inclined.

[0030] In some optional embodiments of the present invention, the flux preparation apparatus further includes a sealing ring 30, which is annular and disposed between the furnace body 10 and the furnace cover 20.

[0031] In this embodiment, by setting the sealing ring 30, the sealing performance of the preparation device can be further improved, thereby quickly reaching the preset vacuum level and reducing the vacuuming time; and the vacuum level inside the furnace body 10 can be increased, thereby further reducing the probability of the raw materials reacting with water in the air.

[0032] In some optional embodiments of the present invention, a cooling ring 40 is fixedly provided at the open end of the furnace body 10. The cooling ring 40 is used to install the sealing ring 30. The cooling ring 40 has an annular cavity inside and is provided with an inlet and an outlet for injecting circulating coolant into the cooling ring 40 to cool the sealing ring 30.

[0033] In this embodiment, by setting a cooling ring 40, the sealing ring 30 can be cooled, thereby improving the service life of the sealing ring 30; and it can also prevent the sealing ring 30 from deforming due to high temperature environment during use, which would affect its sealing effect. In other words, during use, external air will not enter the furnace body 10 through the deformation gap of the sealing ring 30, thereby further reducing the probability of the raw material reacting with water in the air, and further preventing hydrochloric acid corrosion gas from damaging the furnace body 10, and further reducing the magnesium oxide content in the flux, thereby further improving the service life of the furnace body 10 and the quality of the flux product.

[0034] In some optional embodiments of the present invention, an inlet pipe 41 connected to the liquid inlet is fixed on the cooling ring 40, and an outlet pipe 42 connected to the liquid outlet is also fixed on the cooling ring 40.

[0035] In some optional embodiments of the present invention, the opening is located at the upper end of the furnace body 10. In some optional embodiments of the present invention, the opening of the furnace body 10 may also be located on the side of the furnace body 10.

[0036] In some optional embodiments of the present invention, the vent pipe 50 is disposed on the top of the furnace body 10 and communicates with the interior of the furnace body 10; and a first hygrometer is disposed on the top of the furnace body 10 and / or the furnace cover 20, and a second hygrometer is disposed on the vent pipe 50.

[0037] If the working power of the vacuum pump is too high, it will cause the airflow to accumulate in the inlet area of ​​the vent pipe 50. In other words, it will cause the airflow to accumulate in the upper part of the furnace body. Since the temperature at the top of the furnace body and the furnace cover is relatively lower than the temperature at the bottom of the furnace body, the airflow will easily generate condensate when it accumulates in the above-mentioned positions. A large amount of condensate will fall into the bottom of the furnace body. This part of the water will react with the raw materials, thereby affecting the quality of the flux product.

[0038] In this embodiment, a first hygrometer is used to detect the humidity above the interior of the furnace body, recorded as the furnace top humidity; a second hygrometer is used to detect the humidity inside the vent pipe 50, recorded as the extraction humidity. During use, the operating power of the vacuum pump can be controlled based on the aforementioned furnace top humidity and extraction humidity, thereby preventing airflow from accumulating in the inlet area of ​​the vent pipe 50.

[0039] In other words, by setting a first hygrometer and a second hygrometer, the working power of the vacuum pump can be controlled according to the humidity of the furnace top measured by the first hygrometer and the humidity of the exhaust gas measured by the second hygrometer, so as to avoid the problem of water mist or water droplets forming in the inlet area of ​​the exhaust gas flow due to the accumulation of the exhaust gas flow in the inlet area of ​​the vent pipe 50.

[0040] In some alternative embodiments of the present invention, the furnace cover 20 and the furnace body 10 are connected by bolts.

[0041] Specifically, the furnace cover 20 and the furnace body 10 are provided with corresponding threaded holes, and the bolts are adapted to the threaded holes.

[0042] In this embodiment, the above-mentioned bolt connection has the advantages of simple structure and easy operation.

[0043] In some optional embodiments of the present invention, the bottom of the furnace body 10 is provided with support feet 60.

[0044] In some alternative embodiments of the invention, the heating element includes an induction coil.

[0045] In this embodiment, the induction coil has the advantages of uniform heating and high heating efficiency.

[0046] Preferably, the induction coil is disposed at the bottom of the furnace body 10.

[0047] In some alternative embodiments of the invention, the heating element includes a heating plate, a heating rod, or a heating wire.

[0048] In some optional embodiments of the present invention, a stirring component is provided inside the furnace body 10. The stirring component is made of a high-temperature resistant material and is used to stir the raw materials before the heating step; and to stir the liquid flux during the heating step to improve the uniformity of the flux.

[0049] In some optional embodiments of the present invention, the bottom of the furnace body 10 is provided with support feet 60. In this embodiment, by providing support feet 60, the bottom of the furnace body 10 can be prevented from directly contacting the ground, thereby preventing damage to the ground due to excessive furnace temperature.

[0050] Preferably, the support foot 60 is fixedly welded to the bottom of the furnace body 10, and the bottom of the furnace body 10 has an arc-shaped structure.

[0051] More preferably, the bottom of the furnace body 10 is provided with three support feet 60, which are arranged in a ring around the central axis of the furnace body 10. The angle between adjacent support feet 60 is 120°. The support feet 60 contact the ground, which can make the furnace body 10 stand stably and vertically.

[0052] In some alternative embodiments of the present invention, the furnace body 10 is cast from a corrosion-resistant alloy material.

[0053] In this embodiment, the furnace body 10 can operate stably in a high-temperature corrosive environment, which can further extend the service life of the equipment; in addition, the furnace body 10 has the advantage of low manufacturing cost.

[0054] In some optional embodiments of the present invention, the furnace body 10 has a double-layer structure. Specifically, the furnace body 10 includes an inner furnace body and an outer furnace body, which are welded together. The inner furnace body is cast from a corrosion-resistant alloy material, and the outer furnace body is cast from steel.

[0055] In this embodiment, an outer furnace body is added to the outside of the inner furnace body, which can protect the inner furnace body and further extend its service life.

[0056] In some alternative embodiments of the present invention, the furnace cover 20 is cast from a corrosion-resistant alloy material.

[0057] In some optional embodiments of the present invention, the furnace cover 20 has a double-layer structure. Specifically, the furnace cover 20 includes an inner furnace cover and an outer furnace cover, which are welded together. The inner furnace cover is cast from a corrosion-resistant alloy material; the outer furnace cover is cast from steel.

[0058] In this embodiment, an outer furnace cover is added to the outside of the inner furnace cover, which can protect the inner furnace cover and further extend its service life.

[0059] In some alternative embodiments of the present invention, the sealing ring 30 is made of high-temperature resistant silicone material.

[0060] High-temperature resistant silicone is a new type of lightweight and energy-saving material. It is based on a high molar mass linear polydimethyl (or methyl vinyl, methyl phenyl vinyl, methyl trifluoropropyl, etc.) siloxane polymer, mixed with reinforcing fillers and vulcanizing agents (organosilicon oxides), and vulcanized into an elastomer under heating and pressure.

[0061] High-temperature resistant silicone has advantages such as high temperature resistance, corrosion resistance, good thermal stability, low thermal conductivity, small heat capacity, good resistance to mechanical vibration, small thermal expansion, and good thermal insulation performance. It is a new type of material that can replace ordinary sealing rubber.

[0062] Therefore, in this embodiment, the sealing ring 30 made of high-temperature resistant silicone material has the advantages of high temperature resistance, corrosion resistance, long service life, and good heat preservation effect. That is to say, the sealing ring 30 in this embodiment not only has a sealing function, but also a heat preservation function, which can prevent heat from the furnace body 10 from flowing out through the sealing ring 30 and affecting the heating effect.

[0063] like Figure 4-5 As shown in the figure, the present invention also provides a method for preparing flux for aluminum and aluminum alloys. The preparation process of the flux utilizes the preparation apparatus as described in any of the above embodiments. The preparation method includes: a pretreatment step, a vacuuming step, and a heating step.

[0064] Pretreatment steps: After drying the raw materials, add them to the furnace body 10 and mix them evenly.

[0065] Vacuuming step: Seal the furnace cover 20 onto the furnace body 10, connect the vent pipe 50 to the vacuum pump, and perform vacuuming on the furnace body 10.

[0066] Heating step: The raw material inside the furnace body 10 is heated by the heating element, and the hydrochloric acid gas inside the furnace body 10 is discharged through the vent pipe 50 to obtain liquid flux.

[0067] In this embodiment, drying the raw materials in the pretreatment step reduces the water content, thereby minimizing the reaction between magnesium chloride and water. Performing a vacuuming step before the heating step places the raw materials in a vacuum environment, effectively preventing the following reaction between the raw materials and water vapor in the air during the remelting process: 6℃~117℃: MgCl2·6H2O→MgCl2·4H2O+2H2O 135℃~180℃: MgCl2·4H2O→MgCl2·2H2O+2H2O 185℃~230℃: MgCl2·2H2O→MgCl2·H2O+H2O MgCl2·2H2O→MgOHCl+HCl+H2O Above 230℃: MgCl2·H2O→MgCl2+H2O MgCl2·H2O→MgOHCl+HCl 304℃~554℃: MgCl2+H2O→MgOHCl+HCl Above 527℃: MgOHCl → MgO + HCl Therefore, by using the preparation method of the present invention, the furnace body 10 can be kept in a vacuum state during the heating process, thereby effectively isolating the raw materials from reacting with moisture in the air, reducing the generation of hydrochloric acid corrosive gas, controlling the magnesium oxide content in the flux, greatly improving the quality of the flux product, and thus ensuring the refining effect of aluminum and aluminum alloys.

[0068] In some optional embodiments of the present invention, in the pretreatment step: after the raw material is dried, it is kept warm for a preset time, and then added to the furnace body 10 and mixed evenly.

[0069] In some optional embodiments of the present invention, the preparation method further includes a crushing step, wherein, in response to the end of the heating step, after the liquid flux has solidified into a solid flux, the solid flux is crushed to obtain the flux product.

[0070] Specifically, after the heating step is completed, the liquid flux is solidified into a solid flux, which is then crushed to obtain granular or powdered flux products. The crushing process parameters can be set according to the particle size requirements of the flux products.

[0071] Preferably, in some optional embodiments of the present invention, the particle size of the flux product is 2 to 5 mm (e.g., particle size of 2 mm, 3 mm, 4 mm or 5 mm).

[0072] In some optional embodiments of the present invention, the magnesium oxide content in the flux product is less than 0.5%.

[0073] In some optional embodiments of the present invention, the vacuuming step further includes: injecting circulating coolant into the cooling ring 40 to cool the sealing ring 30.

[0074] Specifically, before or after vacuuming the furnace body 10, circulating coolant is injected into the cooling ring 40 to cool the sealing ring 30.

[0075] In this embodiment, the above-mentioned settings can improve the service life of the sealing ring 30 and reduce the deformation of the sealing ring 30, thereby further improving the sealing effect.

[0076] Preferably, the temperature of the coolant is 10~20℃ (e.g., 10℃, 11℃, 12℃, 13℃, 14℃, 15℃, 16℃, 17℃, 18℃, 19℃ or 20℃). More preferably, the coolant is cooling water. In some alternative embodiments of the invention, the coolant may also be cooling oil.

[0077] In this embodiment, cooling water is used as the coolant, which has the advantage of low operating cost.

[0078] In some optional embodiments of the present invention, the vent pipe 50 of the preparation device used in the preparation process of flux for aluminum and aluminum alloys is disposed at the top of the furnace body 10 and communicates with the interior of the furnace body 10; and a first hygrometer is disposed on the top of the furnace body 10 and / or the furnace cover 20, and a second hygrometer is disposed on the vent pipe 50.

[0079] The vacuuming step also includes: injecting circulating coolant into the cooling ring, and simultaneously obtaining the furnace top humidity measured by the first hygrometer and the exhaust humidity measured by the second hygrometer; wherein the temperature of the coolant is cooling water at 10~20℃.

[0080] Preferably, in some optional embodiments of the present invention, the preparation method further includes: determining whether the humidity at the furnace top is greater than the humidity at the extraction point; if so, reducing the operating power of the vacuum pump to a first preset value; or, if not, increasing the operating power of the vacuum pump to a second preset value.

[0081] Specifically, the furnace top humidity measured by the first hygrometer and the exhaust humidity measured by the second hygrometer are first obtained, and then it is determined whether the furnace top humidity is greater than the exhaust humidity. If the furnace top humidity is greater than the exhaust humidity, the working power of the vacuum pump is reduced to the first preset value. If the furnace top humidity is not greater than the exhaust humidity, the working power of the vacuum pump is increased to the second preset value.

[0082] In this embodiment, if the humidity at the furnace top is greater than the humidity at the extraction point, it indicates that a large amount of gas has accumulated at the furnace top. When a large amount of gas encounters cold air, it forms water mist or water droplets. At this time, reducing the working power of the vacuum pump to the first preset value can reduce the extraction rate and thus prevent the airflow from accumulating at the furnace top.

[0083] In this embodiment, if the humidity at the furnace top is not greater than the humidity at the extraction point, the current extraction rate is relatively low. In this case, increasing the working power of the vacuum pump to the second preset value can improve the efficiency of vacuuming.

[0084] Preferably, in some optional embodiments of the present invention, the preparation method further includes: responding to the furnace top humidity being greater than the exhaust humidity and the duration being not less than a preset time; intermittently adjusting the working power of the vacuum pump with a third preset value and a first preset value to form turbulence at the inlet of the vent pipe; the third preset value being between the first preset value and the second preset value.

[0085] Specifically, when the humidity at the furnace top is greater than the humidity at the exhaust gas level, and the duration is not less than the preset duration, the working power of the vacuum pump intermittently executes the third preset value and the first preset value, which can make the exhaust gas speed increase and decrease intermittently, thereby forming turbulence at the inlet of the vent pipe. This not only prevents the airflow from accumulating at the air inlet, but also has a large exhaust gas efficiency.

[0086] In some optional embodiments of the present invention, the raw materials comprise, by mass percentage: KCl: 39-61%, MgCl2: 39-61%.

[0087] Specifically, the percentages of KCl and MgCl2 in the raw materials are added together to 100%. For example: when the KCl content in the raw materials is 39%, the MgCl2 content is 61%; or, when the KCl content in the raw materials is 50%, the MgCl2 content is 50%; or, when the KCl content in the raw materials is 40%, the MgCl2 content is 60%; or, when the KCl content in the raw materials is 55%, the MgCl2 content is 45%; or, when the KCl content in the raw materials is 45%, the MgCl2 content is 55%; or, when the KCl content in the raw materials is 61%, the MgCl2 content is 39%.

[0088] In some optional embodiments of the present invention, the raw materials comprise, by mass percentage: NaCl: 39-61%, MgCl2: 39-61%.

[0089] Specifically, the percentages of NaCl and MgCl2 in the raw materials add up to 100%. For example, when the raw materials contain 39% NaCl, the MgCl2 content is 61%; or, when the raw materials contain 40% NaCl, the MgCl2 content is 60%; or, when the raw materials contain 45% NaCl, the MgCl2 content is 55%; or, when the raw materials contain 55% NaCl, the MgCl2 content is 45%; or, when the raw materials contain 60% NaCl, the MgCl2 content is 40%; or, when the raw materials contain 61% NaCl, the MgCl2 content is 39%.

[0090] In some optional embodiments of the present invention, the heating temperature in the heating step is 550~600°C, and the heating time required per ton of the raw material is 4~6 hours (e.g., 4 hours, 4.5 hours, 5 hours, 5.5 hours or 6 hours).

[0091] Preferably, the heating time required for each ton of the raw material is 5 hours.

[0092] In some optional embodiments of the present invention, after the vacuuming step is completed, the vacuum degree inside the furnace body 10 is 5~20 Pa (e.g., 5 Pa, 10 Pa, 15 Pa, 20 Pa). Example 1

[0093] The raw materials, by mass percentage, include: NaCl: 59% and MgCl2: 41%.

[0094] The preparation method includes the following steps: Pretreatment steps: After drying the raw materials, add them to the furnace body 10 and mix them evenly.

[0095] Vacuuming step: Seal the furnace cover 20 onto the furnace body 10, connect the vent pipe 50 to the vacuum pump, and perform vacuuming on the furnace body 10.

[0096] Heating step: The raw material in the furnace body 10 is heated by the heating component, and the hydrochloric acid gas in the furnace body 10 is discharged through the vent pipe 50 to obtain liquid flux; wherein the heating temperature is 550℃, and the heating time (remelting time) required for each ton of raw material is 4 hours.

[0097] In response to the end of the heating step, after the liquid flux has solidified into a solid flux, the solid flux is crushed to obtain the finished flux product.

[0098] After preparation, the flux product was tested and found to contain less than 0.5% magnesium oxide. Example 2

[0099] The only difference from Example 1 is the composition of the raw materials. In Example 2, the raw materials, by mass percentage, consist of: KCl: 61% and MgCl2: 39%.

[0100] In Example 2, the magnesium oxide content in the prepared flux product was less than 0.5%. Example 3

[0101] The only difference from Example 1 is the composition of the raw materials. In Example 3, the raw materials, by mass percentage, consist of: KCl: 56% and MgCl2: 44%.

[0102] In Example 3, the magnesium oxide content in the prepared flux product was less than 0.5%. Example 4

[0103] The only difference from Example 1 is the composition of the raw materials. In Example 4, the raw materials, by mass percentage, consist of: KCl: 41% and MgCl2: 59%.

[0104] In Example 4, the magnesium oxide content in the prepared flux product was less than 0.5%.

[0105] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. An apparatus for preparing flux for aluminum and aluminum alloys, characterized in that, include: The furnace body has a receiving space inside and an opening is provided on the furnace body; A furnace cover, which is detachably installed at the opening of the furnace body; A heating element is disposed outside the furnace body and is used to heat the raw materials inside the furnace body; A vent pipe is provided with a filter screen. The vent pipe is configured to: evacuate the furnace body before the heating step and discharge hydrochloric acid gas inside the furnace body during the heating step; the vent pipe is located at the top of the furnace body and communicates with the interior of the furnace body; a first hygrometer is provided on the top of the furnace body and / or the furnace cover, and a second hygrometer is provided on the vent pipe.

2. The preparation apparatus according to claim 1, characterized in that, The flux preparation apparatus further includes a sealing ring, which is annular and disposed between the furnace body and the furnace cover.

3. The preparation apparatus according to claim 2, characterized in that, A cooling ring is fixed at the open end of the furnace body. The cooling ring is used to install the sealing ring. The cooling ring has an annular cavity and is provided with an inlet and an outlet for injecting circulating coolant into the cooling ring to cool the sealing ring.

4. A method for preparing a flux for aluminum and aluminum alloys, characterized in that, The preparation process of the flux for aluminum and aluminum alloys uses the preparation apparatus described in any one of claims 1-3, and the preparation method includes: Pretreatment step: After drying the raw materials, add them to the furnace body and mix them evenly; Vacuuming step: Seal the furnace cover onto the furnace body, connect the vent pipe to the vacuum pump, and perform vacuuming on the furnace body; Heating step: The raw material in the furnace is heated by the heating element, and the hydrochloric acid gas in the furnace is discharged through the vent pipe to obtain liquid flux.

5. The preparation method according to claim 4, characterized in that, The preparation method further includes: Crushing step: In response to the end of the heating step, after the liquid flux solidifies into solid flux, the solid flux is crushed to obtain the flux product, wherein the particle size of the flux product is 2~5mm and the magnesium oxide content in the flux product is less than 0.5%.

6. The preparation method according to claim 5, characterized in that, The flux preparation apparatus further includes a sealing ring, which is annular and disposed between the furnace body and the furnace cover; a cooling ring is fixedly provided at the open end of the furnace body, which is used to install the sealing ring. The cooling ring has an annular cavity inside and is provided with an inlet and an outlet for injecting circulating coolant into the cooling ring to cool the sealing ring. The vacuuming step also includes: Circulating coolant is injected into the cooling ring, and the humidity at the top of the furnace measured by the first hygrometer and the humidity of the exhaust gas measured by the second hygrometer are obtained simultaneously; wherein, the temperature of the coolant is cooling water at 10~20℃.

7. The preparation method according to claim 6, characterized in that, The preparation method further includes: Determine whether the humidity at the furnace top is greater than the humidity at the exhaust gas level; If so, the operating power of the vacuum pump is reduced to a first preset value; or If not, the operating power of the vacuum pump will be increased to the second preset value.

8. The preparation method according to claim 7, characterized in that, In response to the furnace top humidity being greater than the exhaust humidity, and the duration being not less than a preset time; The operating power of the vacuum pump is intermittently adjusted with a third preset value and a first preset value to create turbulence at the inlet of the ventilation pipe; The third preset value is between the first preset value and the second preset value.

9. The preparation method according to claim 7, characterized in that, The raw materials, by mass percentage, include: KCl: 39-61%, MgCl2: 39-61%; or The raw materials, by mass percentage, include: NaCl: 39-61%, MgCl2: 39-61%; In the heating step, the heating temperature is 550~600℃, and the heating time required for each ton of the raw material is 4~6 hours; After the vacuuming step is completed, the vacuum level inside the furnace is 5~20 Pa.

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