Method for continuously preparing magnesium powder through cutting-grinding

Abstract

The embodiment of the invention provides a method for continuously preparing magnesium powder through cutting-grinding, and relates to the technical field of magnesium powder preparation, the spacing between two adjacent stacks of magnesium ingots is equal everywhere by adjusting the magnesium ingot stacking mode during acid pickling before cutting-grinding and other machining processes, and the magnesium powder is obtained. Therefore, the liquidity of the pickling solution between the two adjacent stacks of magnesium ingots is uniform, the problem that due to the fact that various physicochemical properties of the oxide layer and the magnesium elementary substance are greatly different, the purity of final magnesium powder is easily reduced, and machining defects are caused in the magnesium powder machining process is solved, and particularly, the problem that in the cutting and grinding process, the machining quality of the magnesium powder is affected is solved. And impurity particles on the oxide layer can cause larger processing defects in cutting and grinding.

Description

Technical Field

[0001] The present invention relates to the technical field of magnesium powder preparation, and particularly to a method for continuously preparing magnesium powder by cutting-grinding Background Art

[0002] Magnesium metal, with its excellent physical properties such as high specific strength and specific stiffness, excellent processing and forming ability, excellent damping and shock absorption effect, and strong electromagnetic shielding ability, has occupied a pivotal position in many fields such as automobile manufacturing, aerospace, rail transit, electronic communication, and national defense industry, and is known as the "green engineering material of the 21st century". Its application in the biomedical field is even more remarkable. With excellent biocompatibility and biodegradability, it is known as the "revolutionary medical metal material". In addition to the above applications, the active chemical properties of magnesium also bring more possibilities. Magnesium plays a key role in steel desulfurization and strategic metal reduction. Especially spherical magnesium and magnesium powder, due to their large specific surface area and strong surface activity, are not only widely used in the production of chemical products, the manufacture of explosives, and the fireworks industry, but also become efficient reducing agents, desulfurizing agents, and high-quality raw materials for 3D printing. In addition, magnesium powder has also found its application in high-tech fields such as advanced magnesium powder pigments and conductive pastes for the backplane of solar photovoltaic cells. Especially in the automotive and building materials industries, magnesium powder pigments have demonstrated their unique value.

[0003] China's magnesium resource reserves are extremely rich, and it has maintained the world's leading position in primary magnesium production for many years. With decades of unremitting efforts and continuous research, significant progress and achievements have been made in the applied research of magnesium metal in many fields such as alloy production, hydrogen storage materials, and medical materials. However, in the field of magnesium powder preparation, China's research started relatively late and the development speed is relatively slow. Currently, the processing of magnesium powder mainly includes high-temperature atomization method and mechanical powder making method. The former is suitable for making ultrafine magnesium powder, with high precision and good particle uniformity, but the production efficiency is low. The latter has relatively low precision, but low production cost and high efficiency. Currently, the mechanical powder making method is generally used in general scenarios. However, the existing mechanical powder making method has the problem of low purity of the finished product.

[0004] The information disclosed in the background art section of the present application is only intended to deepen the understanding of the general background art of the present application, and should not be regarded as an admission or any form of suggestion that this information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0005] The applicant found that in the production process of magnesium powder, since the mechanical powder making method is to obtain magnesium chips by cutting magnesium ingots, and then process them into magnesium powder, an oxide layer is easily generated on the surface of the magnesium ingot during storage and transportation, and the oxide layer is easily mixed into the magnesium chips when the magnesium ingot is cut into magnesium chips. Since the various physical and chemical properties of the oxide layer are quite different from those of the magnesium element, it is not only easy to reduce the purity of the final magnesium powder, but also cause processing defects in the magnesium powder processing process, especially in the cutting and grinding process, the impurity particles of the oxide layer will cause large processing defects in cutting and grinding, so it is necessary to pickle the magnesium ingot to remove the oxide layer before cutting.

[0006] When manufacturing and transporting magnesium ingots, in order to facilitate casting demoulding and transportation, magnesium ingots are often made into a terrace shape with a narrow top and a wide bottom. Figure 1 As shown, the existing magnesium ingot pickling is to evenly arrange multiple magnesium ingots and stack them in multiple layers in the pickling cage. The arrangement of the magnesium ingots is shown in the figure, and then the pickling cage is transferred to the pickling tank. However, this arrangement of magnesium ingots causes a large difference in the spacing between the two stacks of magnesium ingots, and the pickling effect of the pickling liquid will be inconsistent due to the different spacing. The pickling effect at the narrower spacing (shown in the figure at dmin) is much different from that at the wider spacing (shown in the figure at dmax) due to the poor fluidity of the pickling liquid. Often, the oxide layer has been completely washed away at the larger spacing, while a thicker oxide layer remains at the smaller spacing, or when the oxide layer is completely washed away at the smaller spacing, a part of the magnesium ingot has been washed away at the larger spacing.

[0007] Based on this, it is necessary to provide a method for preparing magnesium powder by continuous cutting-grinding to address the problem of processing defects caused by incomplete removal of the oxide layer before the magnesium ingot enters the cutting-grinding continuous processing.

[0008] The above purpose is achieved through the following technical solutions: A method for preparing magnesium powder by continuous cutting and grinding comprises the following steps: Prepare terraced magnesium ingots with a mass of 5KG-15KG and a purity greater than 99.8%; Pre-cleaning and pre-drying the magnesium ingots, stacking the pre-dried magnesium ingots in a pickling cage, with the small-sized surface of the magnesium ingots on the lower layer corresponding to the small-sized surface of the magnesium ingots on the upper layer, or the large-sized surface of the magnesium ingots on the lower layer corresponding to the large-sized surface of the magnesium ingots on the upper layer, and the spacing between two adjacent stacks of magnesium ingots is equal everywhere; Transfer the pickling cage to the pickling tank so that all the magnesium ingots are immersed in the pickling solution for 40S-50S; The pickling cage is transferred to the cleaning tank so that all the magnesium ingots are immersed in the cleaning liquid and then dried after cleaning; Transfer the dried magnesium ingots into a milling machine or a cutting machine, and process the magnesium ingots into long chips with a size of 20mm * 8mm * 0.5mm; Transfer the 20mm * 8mm * 0.5mm long chips into a chip breaker, and process the long chips into short chips with a size of 5mm * 8mm * 0.5mm; Transfer the 5mm * 8mm * 0.5mm short chips into a ball mill, and grind the short chips into magnesium powder with a particle size of 0.3mm - 0.5mm; Collect the ground magnesium powder, and pack and store it.

[0009] In one embodiment, after transferring the 5mm * 8mm * 0.5mm short chips into a ball mill and grinding the short chips into magnesium powder with a particle size of 0.3mm - 0.5mm, it further includes: Screen the magnesium powder, use the magnesium powder with a particle size of 0.3mm - 0.5mm as the main product, use the magnesium powder with a particle size of 0 - 0.3mm as the by - product, and re - feed the magnesium powder with a particle size greater than 0.5mm into the ball mill for secondary grinding.

[0010] In one embodiment, before the pickling cage is transferred into the pickling tank after pre - drying, use an inert protective gas to surround the magnesium ingots.

[0011] In one embodiment, before the magnesium ingots enter the milling machine or the cutting machine after drying, use an inert protective gas to surround the magnesium ingots.

[0012] In one embodiment, during the pre - drying or drying step, the drying gas is an inert protective gas.

[0013] In one embodiment, the inert protective gas is a gas that does not react with magnesium, and at least includes one or any combination of helium, neon, argon, krypton, xenon, and radon.

[0014] In one embodiment, the purity of the inert protective gas is greater than or equal to 99.9%, and the temperature of the inert protective gas is lower than 50°C.

[0015] In one embodiment, a diversion pump is arranged in the pickling tank, and the diversion pump is used to pump the pickling solution into the space between two adjacent stacks of magnesium ingots.

[0016] In one embodiment, the pumping flow rate of the diversion pump is positively correlated with the space between two adjacent stacks of magnesium ingots.

[0017] In one embodiment, after all the magnesium ingots are immersed in the pickling solution, the distance between the top liquid level of the pickling solution and the top - most magnesium ingot is equal to the distance between two adjacent stacks of magnesium ingots.

[0018] The beneficial effects of the present invention are: The method for preparing magnesium powder by continuous cutting-grinding provided in an embodiment of the present invention adjusts the stacking method of magnesium ingots during pickling before mechanical processing such as cutting-grinding, so that the spacing between two adjacent stacks of magnesium ingots is equal everywhere, thereby making the fluidity of the pickling solution between two adjacent stacks of magnesium ingots relatively uniform, thereby avoiding the problem of large differences in the various physical and chemical properties of the oxide layer and the magnesium element, which easily leads to a reduction in the purity of the final magnesium powder and causes processing defects during the magnesium powder processing process, especially avoiding the problem of large processing defects caused by impurity particles in the oxide layer during cutting and grinding. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is the way of placing magnesium ingots in the pickling cage in the prior art; Figure 2 A flow chart of a method for preparing magnesium powder by continuous cutting-grinding provided in one embodiment of the present invention; Figure 3 The figure shows a method for placing magnesium ingots in a pickling cage in one embodiment of the present invention.

[0020] in: 100. Magnesium ingot. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0022] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically independent entities. That is, these functional entities may be implemented in software form, or in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0023] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or it can be an electrical, mechanical or other form of connection.

[0024] like Figure 2 andFigure 3 As shown in Figure 3 , an embodiment of the present invention provides a method for continuously preparing magnesium powder by cutting and grinding, which is mainly applicable to the mechanical powder-making method for magnesium powder, especially applicable to the processing technology for making magnesium powder using cutting processes such as cutting and grinding. It can reduce impurities such as the oxide layer on the magnesium ingot before entering mechanical processing. Of course, it can also be applicable to other magnesium powder processing technologies that require removing the oxide layer on the magnesium ingot.

[0025] Specifically, the method for continuously preparing magnesium powder by cutting and grinding includes the following steps: S100, Prepare a trapezoidal magnesium ingot 100 with a mass of 5KG - 15KG and a purity greater than 99.8%. S200, Pre-clean and pre-dry the magnesium ingot 100, stack the pre-dried magnesium ingots 100 in an acid pickling cage. The small-sized surface of the magnesium ingot 100 in the lower layer corresponds to the small-sized surface of the magnesium ingot 100 in the upper layer, or the large-sized surface of the magnesium ingot 100 in the lower layer corresponds to the large-sized surface of the magnesium ingot 100 in the upper layer, and the distance between adjacent stacks of magnesium ingots 100 is equal everywhere. S300, Transfer the acid pickling cage to the acid pickling tank so that all the magnesium ingots 100 are immersed in the acid pickling solution for 40S - 50S. S400, Transfer the acid pickling cage to the cleaning tank so that all the magnesium ingots 100 are immersed in the cleaning solution, and then dry after cleaning. S500, Transfer the dried magnesium ingot 100 into a milling machine or a cutting machine, and process the magnesium ingot 100 into long chips with a size of 20mm * 8mm * 0.5mm. S600, Transfer the 20mm * 8mm * 0.5mm long chips into a chip breaker, and process the long chips into short chips with a size of 5mm * 8mm * 0.5mm. S700, Transfer the 5mm * 8mm * 0.5mm short chips into a ball mill, and grind the short chips into magnesium powder with a particle size of 0.3mm - 0.5mm. S800, Collect the ground magnesium powder and pack it for storage.

[0026] Among them, in step S100, the mass of the magnesium ingot 100 is generally 10KG, and the mass of the magnesium ingot 100 can also be adjusted according to actual production requirements. The shape of the magnesium ingot 100 is a trapezoid with a smaller upper top surface size and a larger lower bottom surface size, or other magnesium ingots 100 with a shape that is not a cuboid.

[0027] In step S200, when the magnesium ingots 100 are stored and transported, dust and other pollutants will adhere to their surfaces. To avoid contaminating the pickling bath, before entering the pickling bath, the magnesium ingots 100 are pre-cleaned and pre-dried to remove the pollutants adhering to the surfaces of the magnesium ingots 100. The pre-cleaning can be done by washing with water, or with a cleaning solution, or with the same liquid as that in the pickling bath. After pre-cleaning, to prevent the cleaning solution from entering the pickling bath, the washed magnesium ingots 100 can be dried until no liquid adheres to the surfaces of the magnesium ingots 100. It can be understood that if the same liquid as that in the pickling bath is used for cleaning, the pre-drying step can be omitted.

[0028] When stacking the magnesium ingots 100 in layers, the traditional stacking method is to stack all the magnesium ingots 100 in the same placement manner, as Figure 1 shown. However, this stacking method will result in different distances between adjacent stacks of magnesium ingots 100 everywhere, with a multiple-level difference between the maximum and minimum distances. Due to the narrowing of the distance, the flow rate of the pickling solution at the narrower distance slows down. In the early stage of pickling, after the pickling solution at this place reacts with the oxide layer on the surface of the magnesium ingot 100 for a period of time, its concentration decreases. Due to the slow flow rate, the concentration of the pickling solution at this place cannot be raised to a higher level in time, making the pickling solution at this place at a lower concentration level; while the flow rate of the pickling solution at the larger distance is faster, making the concentration of the pickling solution at this place always at a higher level; as a result, the oxide layer has been completely washed away at the larger distance, while a thicker oxide layer remains at the smaller distance, or when the oxide layer has been completely washed away at the smaller distance, a part of the magnesium ingot 100 has been washed away at the larger distance. In addition, for trapezoidal magnesium ingots 100, to facilitate taking, all the magnesium ingots 100 need to be stacked in the same placement manner, so that the large-sized surfaces and small-sized surfaces of adjacent two magnesium ingots 100 correspond, and the large-sized part of one magnesium ingot 100 protrudes from the small-sized part of the other magnesium ingot 100, which is convenient for taking.

[0029] In step S200, when stacking the magnesium ingots 100, the small-size surfaces of the magnesium ingots 100 in the lower layer correspond to the small-size surfaces of the magnesium ingots 100 in the upper layer, or the large-size surfaces of the magnesium ingots 100 in the lower layer correspond to the large-size surfaces of the magnesium ingots 100 in the upper layer, so that the spacing between adjacent stacks of magnesium ingots 100 is equal everywhere. It should be noted that generally, the magnesium ingots 100 are also transported in stacks during transportation, so the upper and lower surfaces of the magnesium ingots 100 are in contact with each other. Except for the upper surface of the topmost magnesium ingot 100, there is basically no oxide layer on the upper and lower surfaces of the remaining magnesium ingots 100, that is, there are more oxide layers on the side surfaces of the magnesium ingots 100, which need to be removed. By placing the magnesium ingots 100 in the upright position (with the small-size surface on top and the large-size surface on the bottom as the square, and vice versa), upside down, and upright, the spacing between adjacent stacks of magnesium ingots 100 is equal everywhere, and the fluidity of the pickling solution between adjacent stacks of magnesium ingots 100 is relatively uniform, making the pickling effect on the side surfaces of the magnesium ingots 100 relatively uniform.

[0030] Specifically, the magnesium ingots 100 are generally relatively long, with a length-width ratio of 3-4:1. Therefore, the side surface area along the length direction is larger, and the side surface area along the width direction is smaller. In this step, the removal effect of the oxide layer on the side surface along the length direction is mainly considered, that is, the spacing between the above two stacks of magnesium ingots 100 is measured along the width direction of the magnesium ingot 100.

[0031] In step S300, after stacking the magnesium ingots 100 into the pickling cage in the manner of step 200, the pickling cage is transported to the pickling tank so that all the magnesium ingots 100 are immersed in the pickling solution for 40S-50S. The pickling solution is generally an aqueous sulfuric acid solution, and the concentration is generally 10%-30%, and the specific concentration is confirmed according to actual production requirements.

[0032] In step S400, the pickling cage in step S300 is transported to the cleaning tank so that all the magnesium ingots 100 are immersed in the cleaning solution, and then dried after cleaning. The cleaning can be done with water or with a cleaning solution. It can be understood that the cleaning after pickling and the pre-cleaning before pickling can be completed through the same process steps.

[0033] In step S500, the dried magnesium ingots 100 are moved into a milling machine or a cutting machine, and the magnesium ingots 100 are processed into long chips of 20mm*8mm*0.5mm.

[0034] In step S600, the 20mm*8mm*0.5mm long chips are moved into a chip breaker, and the long chips are processed into short chips of 5mm*8mm*0.5mm.

[0035] In step S700, the 5mm*8mm*0.5mm short chips are moved into a ball mill, and the short chips are ground into magnesium powder with a particle size of 0.3mm-0.5mm.

[0036] It can be understood that in step S500, step S600 and step S700, the sizes of long chips, short chips and magnesium powder processed can be adjusted according to actual production needs. For example, in step S500, long chips of 15mm*5mm*0.5mm can be processed, and short chips of 5mm*5mm*0.5mm can be processed in step S600. In step S700, magnesium powder with a particle size of 0.2mm-0.3mm can also be processed.

[0037] In step S800, the ground magnesium powder is collected and packaged for storage. The packaging material should have good sealing and moisture resistance to prevent the magnesium powder from getting damp and contaminated. The packaged magnesium powder should be stored in a dry, ventilated warehouse, avoiding direct sunlight and high temperature environment. At the same time, the warehouse needs to be cleaned and disinfected regularly to ensure the quality and safety of the magnesium powder.

[0038] Therefore, the method for preparing magnesium powder by continuous cutting-grinding provided in an embodiment of the present invention adjusts the stacking method of magnesium ingots during pickling before mechanical processing such as cutting-grinding, so that the spacing between two adjacent stacks of magnesium ingots is equal everywhere, thereby making the fluidity of the pickling solution between two adjacent stacks of magnesium ingots relatively uniform, thereby avoiding the problem of large differences in the various physical and chemical properties of the oxide layer and the magnesium element, which easily leads to a reduction in the purity of the final magnesium powder and causes processing defects in the magnesium powder processing process, especially avoiding the problem of impurity particles in the oxide layer causing large processing defects in cutting and grinding during the cutting and grinding process.

[0039] In one embodiment, after step S700 and before step S800, the following steps are further included: S750, the magnesium powder is screened, the magnesium powder with a particle size of 0.3mm-0.5mm is used as the main product, the magnesium powder with a particle size of 0-0.3mm is used as the by-product, and the magnesium powder with a particle size greater than 0.5mm is put back into the ball mill for secondary grinding.

[0040] Generally, although ball mill grinding has good precision, there will still be magnesium powder with too small or too large particle size. For magnesium powder with too small particle size, since it is not reprocessable, it is classified and collected as a by-product; for magnesium powder with too large particle size, it can be put back into the ball mill for secondary grinding to reduce its size to the required particle size.

[0041] In one of the embodiments, before pickling cages are transported into the pickling tank after pre-drying, inert protective gas is used to surround the magnesium ingots, or before the magnesium ingots enter the milling machine or cutting machine after drying, inert protective gas is used to surround the magnesium ingots, or during the pre-drying or drying steps, the drying gas is inert protective gas. When the magnesium ingots are unpacked and enter the processing, or at each stage during the processing, except that the magnesium ingots cannot be raised to a relatively high temperature before entering the pickling tank, in order to facilitate processing in the remaining processes, the magnesium ingots are generally at a relatively high temperature. To avoid re-oxidation of the magnesium ingots at high temperatures, inert protective gas can be introduced around the magnesium ingots to protect the magnesium ingots or intermediate products from secondary oxidation. Of course, other anti-oxidation methods can also be applied to the present invention, such as enclosing the processing production line to reduce the air circulation at the processing site and reduce the contact between oxygen and the magnesium ingots or intermediate products.

[0042] Furthermore, the inert protective gas is a gas that does not react with magnesium, and at least includes one or any combination of helium, neon, argon, krypton, xenon, and radon. The purity of the inert protective gas is greater than or equal to 99.9%, and the temperature of the inert protective gas is lower than 50°C.

[0043] In one of the embodiments, in order to further enhance the fluidity of the pickling solution between two stacks of magnesium ingots, a diversion pump is provided in the pickling tank. The diversion pump is used to pump the pickling solution into the space between adjacent two stacks of magnesium ingots, thereby forming a flow path of the pickling solution, making the pickling solution in the entire pickling tank relatively uniform everywhere. And, since the space between adjacent two stacks of magnesium ingots is equal everywhere, there will be no narrow places that cause difficulties in the circulation of the pickling solution.

[0044] Furthermore, when the space between adjacent two stacks of magnesium ingots is not equal, the pumping flow rate of the diversion pump is positively correlated with the space between adjacent two stacks of magnesium ingots, further making the pickling solution in the entire pickling tank relatively uniform everywhere.

[0045] In one of the embodiments, in order to further enhance the consistent removal effect of the oxide layer on each surface of the magnesium ingots, after all the magnesium ingots are immersed in the pickling solution, the distance between the top liquid level of the pickling solution and the topmost stack of magnesium ingots is equal to the distance between adjacent two stacks of magnesium ingots. Thus, the amount of pickling solution around each surface of each magnesium ingot is approximately uniform.

[0046] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data that have been authorized by the user or fully authorized by all parties, and the collection, use, and processing of relevant data need to comply with the relevant laws, regulations, and standards of relevant countries and regions.

[0047] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, database, or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memories. Non-volatile memories can include read-only memory (ROM), magnetic tapes, floppy disks, flash memories, optical memories, high-density embedded non-volatile memories, resistive random access memories (ReRAM), magnetoresistive random access memories (MRAM), ferroelectric random access memories (FRAM), phase change memories (PCM), graphene memories, etc. Volatile memories can include random access memory (RAM) or external cache memories, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM), etc. The databases involved in the embodiments provided in the present application can include at least one of relational databases and non-relational databases. Non-relational databases can include distributed databases based on blockchain, etc., without limitation. The processors involved in the embodiments provided in the present application can be general-purpose processors, central processors, graphics processors, digital signal processors, programmable logics, data processing logics based on quantum computing, etc., without limitation.

[0048] The technical features of the above embodiments can be combined arbitrarily. For the sake of concise description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0049] The above-described embodiments merely represent several implementation manners of the present application. Their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A method for preparing magnesium powder by continuous cutting and grinding, characterized in that: The following steps are involved: Prepare terraced magnesium ingots with a mass of 5KG-15KG and a purity greater than 99.8%; Pre-cleaning and pre-drying the magnesium ingots, stacking the pre-dried magnesium ingots in a pickling cage, with the small-sized surface of the magnesium ingots on the lower layer corresponding to the small-sized surface of the magnesium ingots on the upper layer, or the large-sized surface of the magnesium ingots on the lower layer corresponding to the large-sized surface of the magnesium ingots on the upper layer, and the spacing between two adjacent stacks of magnesium ingots is equal everywhere; Transfer the pickling cage to the pickling tank so that all the magnesium ingots are immersed in the pickling solution for 40S-50S; The pickling cage is transferred to the cleaning tank so that all the magnesium ingots are immersed in the cleaning liquid and dried after cleaning; The dried magnesium ingot is moved into a milling machine or a cutting machine to process the magnesium ingot into long chips of 20mm*8mm*0.5mm; Move the long chips of 20mm*8mm*0.5mm into the chip breaker and process them into short chips of 5mm*8mm*0.5mm; The short chips of 5mm*8mm*0.5mm are moved into the ball mill and ground into magnesium powder with a particle size of 0.3mm-0.5mm; Collect the ground magnesium powder and pack it for storage.

2. The method for preparing magnesium powder by continuous cutting-grinding according to claim 1, characterized in that: The short chips of 5mm*8mm*0.5mm are moved into the ball mill, and the short chips are ground into magnesium powder with a particle size of 0.3mm-0.5mm. The process also includes: The magnesium powder is screened, and the magnesium powder with a particle size of 0.3mm-0.5mm is used as the main product, the magnesium powder with a particle size of 0-0.3mm is used as the by-product, and the magnesium powder with a particle size greater than 0.5mm is put back into the ball mill for secondary grinding.

3. The method for preparing magnesium powder by continuous cutting-grinding according to claim 1, characterized in that: After pre-drying and before the pickling cage is transferred to the pickling tank, the magnesium ingot is surrounded by an inert protective gas.

4. The method for preparing magnesium powder by continuous cutting-grinding according to claim 1, characterized in that: After drying, the magnesium ingot is surrounded by an inert protective gas before it enters the milling or cutting machine.

5. The method for preparing magnesium powder by continuous cutting-grinding according to claim 1, characterized in that: In the pre-drying or drying step, the drying gas is an inert protective gas.

6. The method for preparing magnesium powder by continuous cutting-grinding according to any one of claims 3 to 5, characterized in that: The inert protective gas is a gas that does not react with magnesium, and includes at least one of helium, neon, argon, krypton, xenon, and radon, or a combination of any of the above.

7. The method for preparing magnesium powder by continuous cutting-grinding according to any one of claims 3 to 5, characterized in that: The purity of the inert protective gas is greater than or equal to 99.9%, and the temperature of the inert protective gas is lower than 50°C.

8. The method for preparing magnesium powder by continuous cutting-grinding according to claim 1, characterized in that: A diversion pump is provided in the pickling tank, and the diversion pump is used to pump the pickling liquid into the gap between two adjacent stacks of magnesium ingots.

9. The method for preparing magnesium powder by continuous cutting-grinding according to claim 8, characterized in that: The pumping flow rate of the diversion pump is positively correlated with the distance between two adjacent stacks of magnesium ingots.

10. The method for preparing magnesium powder by continuous cutting-grinding according to claim 1, characterized in that: After all the magnesium ingots are immersed in the pickling solution, the distance between the top liquid surface of the pickling solution and the top layer of magnesium ingots is equal to the distance between two adjacent stacks of magnesium ingots.

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