Preparation method of magnesium-based hydride slurry and magnesium-based hydride slurry

Abstract

The invention discloses a preparation method of magnesium-based hydride slurry and the magnesium-based hydride slurry, and relates to the technical field of energy storage, and according to the technical scheme, a novel heat storage and heat transfer medium is prepared by adopting the high heat storage density of magnesium-based hydride and the high fluidity and high heat conductivity of organic silicone oil. And the magnesium-based hydride catalyst TiMn2 is added into the medium, and the magnesium-based hydride catalyst TiMn2 can reduce the environment temperature required by the reaction of hydrogen released by the hydride and improve the reaction rate of hydrogen released by the hydride, so that the heat storage density and the power generation efficiency can be effectively improved in a photo-thermal power generation system, the operation cost of the system is reduced, and the service life of the system is prolonged. And efficient cyclic utilization of heat storage and heat release under the high-temperature condition is achieved.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a method for preparing a magnesium-based hydride slurry and the magnesium-based hydride slurry itself. Background Technology

[0002] Concentrated solar power (CSP) has received widespread attention and research globally as a mature and promising renewable energy technology. Given the intermittent and unstable nature of solar energy, thermal energy storage technology has become a key component of CSP systems. Common heat storage media in these systems include molten salt, thermal oil, and solid materials. However, these media still face some limitations in practical applications. For example, molten salt has a relatively narrow applicable operating temperature range. Therefore, developing new heat storage and transfer media to improve the overall efficiency of CSP systems has become an urgent priority.

[0003] Magnesium-based hydrides are considered promising thermochemical thermal storage materials due to their high heat storage density. However, their application in concentrated solar power (CSP) systems faces several challenges. Magnesium-based hydrides require high temperatures for hydrogen release and exhibit slow reaction kinetics. Furthermore, their solid state and lack of fluidity limit their applicability in practical CSP systems. Therefore, addressing these issues through material improvements and technological innovations is crucial for advancing the application of magnesium-based hydrides in CSP. Summary of the Invention

[0004] The main objective of this invention is to provide a method for preparing magnesium-based hydride slurry and the magnesium-based hydride slurry itself, aiming to solve the problems of high hydrogen release temperature, slow reaction kinetics, and lack of fluidity in the application of magnesium-based hydrides in solar thermal power generation systems.

[0005] To achieve the above objectives, the method for preparing magnesium-based hydride slurry proposed in this invention includes the following steps:

[0006] Metallic Ti and metallic Mn were prepared according to the atomic mass ratio of Ti atoms to Mn atoms in TiMn2, and then placed in a high vacuum electric arc melting furnace for melting to obtain magnesium-based hydride catalyst TiMn2;

[0007] Prepare MgH2 compound and magnesium-based hydride catalyst TiMn2 obtained by smelting according to the first component ratio, and place them in a ball mill jar with an air filling valve. Fill the ball mill jar with stainless steel grinding balls and seal the ball mill jar.

[0008] Hydrogen gas is introduced into the ball mill jar through the gas filling valve, the ball mill jar is placed into the planetary ball mill, the planetary ball mill is started, and magnesium-based hydride composite material is obtained.

[0009] The organosilicon oil and the magnesium-based hydride composite material obtained after starting the planetary ball mill were prepared according to the second component ratio and placed in the same container for stirring to obtain magnesium-based hydride slurry.

[0010] In one embodiment, the first component ratio is: 95-98 wt% MgH2 and 5-2 wt% TiMn2.

[0011] In one embodiment, the second component ratio is: 15-35 wt% silicone oil and 85-65 wt% magnesium-based hydride composite material.

[0012] In one embodiment, the steps of preparing MgH2 compound and magnesium-based hydride catalyst TiMn2 obtained by smelting according to the first composition ratio and placing them into a ball mill jar with an air filling valve, filling the ball mill jar with stainless steel grinding balls, and sealing the ball mill jar are carried out in an inert gas environment.

[0013] And / or, the step of preparing the organosilicon oil and the magnesium-based hydride composite material obtained after starting the plasma ball mill according to the second composition ratio, and then stirring them in the same container to obtain the magnesium-based hydride slurry is carried out in an inert gas environment.

[0014] In one embodiment, the step of arranging metallic Ti and metallic Mn according to the atomic mass ratio of Ti atoms to Mn atoms in TiMn2 and placing them in a high-vacuum electric arc melting furnace for melting specifically includes the following steps:

[0015] Metallic Ti and metallic Mn are prepared according to the atomic mass ratio of Ti atoms to Mn atoms in TiMn2 and placed in a clean high-vacuum electric arc melting furnace;

[0016] Vacuum evacuation is performed inside the vacuum arc melting furnace;

[0017] A small amount of argon gas is introduced into the vacuum arc melting furnace;

[0018] The vacuum arc melting furnace is started to melt the metallic Ti and metallic Mn in the furnace.

[0019] In one embodiment, prior to the step of preparing the MgH2 compound and the smelted magnesium-based hydride catalyst TiMn2 according to the first composition ratio and placing them into a ball mill jar equipped with an aeration valve, the following step is further included:

[0020] In an inert gas environment, the obtained magnesium-based hydride catalyst TiMn2 was crushed into small pieces of 1-10 mm using a titanium alloy mortar and pestle. The small pieces were then placed in a high-temperature and high-pressure hydrogen reactor, and hydrogen gas at 4 MPa was introduced to heat the reactor to 350°C.

[0021] In one embodiment, prior to the step of preparing the MgH2 compound and the smelted magnesium-based hydride catalyst TiMn2 according to the first composition ratio and placing them into a ball mill jar equipped with an aeration valve, the following step is further included:

[0022] The heated small pieces are ground, and the ground powder is then sieved through a 200-mesh sieve.

[0023] In one embodiment, the step of filling the mill jar with stainless steel grinding balls specifically includes:

[0024] Multiple stainless steel grinding balls with diameters ranging from 2 to 10 mm are loaded into the grinding jar according to a ratio of 20:1 between the mass of the stainless steel grinding balls and the total mass of the MgH2 compound and the magnesium-based hydride catalyst TiMn2 placed in the grinding jar.

[0025] In one embodiment, the steps of filling the milling jar with hydrogen gas through the gas filling valve, loading the milling jar into the planetary ball mill, starting the planetary ball mill, and obtaining the magnesium-based hydride composite material specifically include the following steps:

[0026] Repeatedly introduce argon gas into the ball mill jar and evacuate the ball mill jar until the oxygen in the ball mill jar is removed, then introduce hydrogen gas at 10-20 MPa.

[0027] The grinding jar is loaded into the planetary ball mill;

[0028] The planetary ball mill is set to intermittent operation mode, with the following operating parameters: 30 minutes of ball mill operation time, 30 minutes of pause time, and a total operating time of 3 to 6 hours.

[0029] Open the vent valve of the grinding jar to reduce the air pressure inside the grinding jar;

[0030] Repeatedly introduce argon gas into the grinding jar and evacuate the grinding jar until the hydrogen gas inside the grinding jar is removed;

[0031] In an inert gas environment, the ball mill jar was opened to remove the magnesium-based hydride composite material.

[0032] The present invention also proposes a magnesium-based hydride slurry, which is prepared by the preparation method of magnesium-based hydride slurry described in any one of the above embodiments.

[0033] The technical solution of this invention utilizes the high heat storage density of magnesium-based hydrides and the high fluidity and high thermal conductivity of organosilicon oil to prepare a novel heat storage and heat transfer medium. Furthermore, the medium incorporates a magnesium-based hydride catalyst, TiMn2, which can lower the ambient temperature required for the hydrogen release reaction of the hydride and increase the reaction rate. This effectively improves the heat storage density and power generation efficiency in solar thermal power generation systems, reduces system operating costs, and achieves efficient recycling of heat storage and release under high-temperature conditions. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0035] Figure 1 A flowchart of the first embodiment of the method for preparing magnesium-based hydride slurry provided by the present invention;

[0036] Figure 2 A flowchart of the second embodiment of the method for preparing magnesium-based hydride slurry provided by the present invention;

[0037] Figure 3 A flowchart of the third embodiment of the method for preparing magnesium-based hydride slurry provided by the present invention;

[0038] Figure 4 A flowchart of the fourth embodiment of the method for preparing magnesium-based hydride slurry provided by the present invention;

[0039] Figure 5 A flowchart of the fifth embodiment of the method for preparing magnesium-based hydride slurry provided by the present invention;

[0040] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0042] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0043] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0044] This invention proposes a method for preparing magnesium-based hydride slurry.

[0045] Please see Figure 1 In one embodiment of the present invention, the preparation method of the magnesium-based hydride slurry includes the following steps:

[0046] Metallic Ti and metallic Mn were prepared according to the atomic mass ratio of Ti atoms to Mn atoms in TiMn2, and then placed in a high vacuum electric arc melting furnace for melting to obtain magnesium-based hydride catalyst TiMn2;

[0047] Prepare MgH2 compound and magnesium-based hydride catalyst TiMn2 obtained by smelting according to the first component ratio, and place them in a ball mill jar with an air filling valve. Fill the ball mill jar with stainless steel grinding balls and seal the ball mill jar.

[0048] Hydrogen gas is introduced into the ball mill jar through the gas filling valve, the ball mill jar is placed into the planetary ball mill, the planetary ball mill is started, and magnesium-based hydride composite material is obtained.

[0049] The organosilicon oil and the magnesium-based hydride composite material obtained after starting the planetary ball mill were prepared according to the second component ratio and placed in the same container for stirring to obtain magnesium-based hydride slurry.

[0050] In this embodiment, the metallic Ti can be high-purity Ti particles, such as Ti particles with a purity of 99.9% and a particle size of 3*3mm, and the metallic Mn can be electrolytic Mn flakes with a size of 1-10mm. It should be noted that the materials listed above are merely illustrative examples and should not be considered as limiting the technical solution of the present invention. When metallic Ti and metallic Mn are placed in a high-vacuum electric arc melting furnace for melting, the particles need to be repeatedly turned and melted four times to ensure uniform melting.

[0051] In the step of charging hydrogen into the grinding jar through the charging valve, loading the grinding jar into the planetary ball mill, and starting the planetary ball mill to obtain the magnesium-based hydride composite material, the purpose of ball milling is to change the physical properties of the magnesium-based hydride catalyst TiMn2 obtained by high-vacuum electric arc melting furnace, transforming it from a large solid block into fine solid particles. Charging high-pressure hydrogen into the ball mill valve is to prevent the decomposition of MgH2 during ball milling. This is because in conventional ball milling, the friction between the material, the stainless steel grinding balls, and the grinding jar generates heat, which easily leads to the decomposition of MgH2 into Mg and H2. Mg is prone to cold welding during ball milling, affecting the milling effect and causing a decline in material properties.

[0052] In the step of preparing the silicone oil according to the second component ratio and starting the planetary ball mill to obtain the magnesium-based hydride composite material, and then stirring it in the same container to obtain the magnesium-based hydride slurry, the stirring time can be controlled within the range of 10 to 20 hours to achieve sufficient stirring of the silicone oil and the magnesium-based hydride composite material obtained after starting the planetary ball mill. Furthermore, stirring the MgH2-TiMn2 composite material with the silicone oil with good fluidity and heat transfer properties results in a final magnesium-based hydride slurry with higher heat storage density.

[0053] This embodiment utilizes the high heat storage density of magnesium-based hydrides and the high fluidity and thermal conductivity of organosilicon oil to prepare a novel heat storage and heat transfer medium. Furthermore, the medium incorporates a magnesium-based hydride catalyst, TiMn2. TiMn2 can lower the ambient temperature required for the hydrogen release reaction of the hydride and increase the reaction rate, effectively improving heat storage density and power generation efficiency in solar thermal power generation systems, reducing system operating costs, and achieving efficient recycling of heat storage and release under high-temperature conditions.

[0054] In one embodiment of the present invention, the first composition ratio is: 95-98 wt% MgH2 and 5-2 wt% TiMn2. In this embodiment, TiMn2 acts as a catalyst during the reaction of MgH2 absorbing heat and releasing hydrogen. Only a small amount of TiMn2 is needed to achieve a high catalytic effect. Excessive TiMn2 is not conducive to controlling the reaction rate and will cause material waste. Therefore, the first composition ratio is set to: 95-98 wt% MgH2 and 5-2 wt% TiMn2.

[0055] In one embodiment of the present invention, the second component ratio is: 15-35 wt% silicone oil and 85-65 wt% magnesium-based hydride composite material. In this embodiment, Helisol 5 can be used as the silicone oil. The hydrogen release temperature of the above-mentioned magnesium-based hydride composite material is about 250°C. After adding silicone oil, the prepared magnesium-based hydride slurry is in the form of a slurry or paste and has a certain fluidity. The prepared magnesium-based hydride slurry can be placed in a thermal storage tank to play a role in heat storage and heat transfer in a solar thermal power generation system.

[0056] To prevent the oxidation of magnesium-based hydrides, in one embodiment of the present invention, the steps of preparing MgH2 compound and magnesium-based hydride catalyst TiMn2 obtained by smelting according to the first composition ratio and placing them into a ball mill jar with an air filling valve, filling the ball mill jar with stainless steel grinding balls, and sealing the ball mill jar are carried out in an inert gas environment.

[0057] And / or, the step of preparing the organosilicon oil and the magnesium-based hydride composite material obtained after starting the plasma ball mill according to the second composition ratio, and then stirring them in the same container to obtain the magnesium-based hydride slurry is carried out in an inert gas environment.

[0058] Please see Figure 2 In one embodiment of the present invention, the step of arranging metallic Ti and metallic Mn according to the atomic mass ratio of Ti atoms to Mn atoms in TiMn2 and placing them in a high-vacuum electric arc melting furnace for melting specifically includes the following steps:

[0059] Metallic Ti and metallic Mn are prepared according to the atomic mass ratio of Ti atoms to Mn atoms in TiMn2 and placed in a clean high-vacuum electric arc melting furnace;

[0060] Vacuum evacuation is performed inside the vacuum arc melting furnace;

[0061] A small amount of argon gas is introduced into the vacuum arc melting furnace;

[0062] The vacuum arc melting furnace is started to melt the metallic Ti and metallic Mn in the furnace.

[0063] In this embodiment, the vacuum evacuation step inside the vacuum arc melting furnace is to remove oxygen from the furnace and prevent oxidation of the metal raw materials. The step of introducing a small amount of argon gas into the furnace further isolates the metal raw materials from oxygen and prevents the reaction from being too violent and causing a fire or explosion risk.

[0064] Please see Figure 3 In one embodiment of the present invention, before the step of preparing the MgH2 compound and the smelted magnesium-based hydride catalyst TiMn2 according to the first composition ratio and placing them into a ball mill jar equipped with an air filling valve, the following step is further included:

[0065] In an inert gas environment, the obtained magnesium-based hydride catalyst TiMn2 was crushed into small pieces of 1-10 mm using a titanium alloy mortar and pestle. The small pieces were then placed in a high-temperature and high-pressure hydrogen reactor, and hydrogen gas at 4 MPa was introduced to heat the reactor to 350°C.

[0066] In this embodiment, the TiMn2 catalyst material is a classic AB2-type hydrogen storage material that can reversibly absorb and desorb hydrogen at room temperature. However, after the material is prepared, it needs to undergo activation treatment. Activation refers to the process of treating the TiMn2 catalyst material under high temperature and high hydrogen pressure conditions, which forces the material to hydrogenate, transforming the catalyst material's performance from a relatively stable state (not absorbing hydrogen at room temperature) to a state of reversible hydrogen absorption and desorption. Therefore, hydrogen needs to be introduced into the reactor to achieve the activation of the TiMn2 catalyst.

[0067] To facilitate subsequent ball milling of the MgH2 compound and the smelted magnesium-based hydride catalyst TiMn2, and to ensure thorough mixing of the MgH2 compound and the smelted magnesium-based hydride catalyst TiMn2, please refer to [link to relevant documentation]. Figure 4 In one embodiment of the present invention, before the step of preparing the MgH2 compound and the smelted magnesium-based hydride catalyst TiMn2 according to the first composition ratio and placing them into a ball mill jar equipped with an air filling valve, the following step is further included:

[0068] The heated small pieces are ground, and the ground powder is then sieved through a 200-mesh sieve.

[0069] When the ball mill is running, it drives the grinding jar to rotate. The stainless steel grinding balls inside the grinding jar crush the raw material to be ground through collision and falling. In order to ensure that the stainless steel grinding balls have sufficient inertial potential energy to grind the raw material when the grinding jar rotates, in one embodiment of the present invention, the step of filling the grinding jar with stainless steel grinding balls specifically includes:

[0070] Multiple stainless steel grinding balls with diameters ranging from 2 to 10 mm are loaded into the grinding jar according to a ratio of 20:1 between the mass of the stainless steel grinding balls and the total mass of the MgH2 compound and the magnesium-based hydride catalyst TiMn2 placed in the grinding jar.

[0071] In this way, the quality of the stainless steel grinding balls is ensured so that they have sufficient inertial potential energy, and the diameter of the stainless steel grinding balls is controlled to be 2-10mm to ensure that the particle size of the raw material is not too large after grinding.

[0072] Please see Figure 5 In one embodiment of the present invention, the steps of filling the milling jar with hydrogen gas through the gas filling valve, loading the milling jar into the planetary ball mill, starting the planetary ball mill, and obtaining the magnesium-based hydride composite material specifically include the following steps:

[0073] Repeatedly introduce argon gas into the ball mill jar and evacuate the ball mill jar until the oxygen in the ball mill jar is removed, then introduce hydrogen gas at 10-20 MPa.

[0074] The grinding jar is loaded into the planetary ball mill;

[0075] The planetary ball mill is set to intermittent operation mode, with the following operating parameters: 30 minutes of ball mill operation time, 30 minutes of pause time, and a total operating time of 3 to 6 hours.

[0076] Open the vent valve of the grinding jar to reduce the air pressure inside the grinding jar;

[0077] Repeatedly introduce argon gas into the grinding jar and evacuate the grinding jar until the hydrogen gas inside the grinding jar is removed;

[0078] In an inert gas environment, the ball mill jar was opened to remove the magnesium-based hydride composite material.

[0079] In this embodiment, the milling jar has an inflation valve and an exhaust valve. The purpose of repeatedly introducing argon gas into the milling jar and evacuating it until all oxygen is removed is to prevent the frictional heat generated during milling from causing a reaction between hydrogen and oxygen, which could lead to an explosion. Similarly, the purpose of repeatedly introducing argon gas into the milling jar and evacuating it until all hydrogen is removed is to prevent hydrogen from escaping into the air, thus avoiding the risk of ignition for operators in a hydrogen-filled environment. The step of opening the milling jar to remove the magnesium-based hydride composite material in an inert gas environment is to prevent the magnesium-based hydride from oxidizing upon contact with oxygen in the air, causing shape changes, and consequently affecting the heat storage performance of the final slurry.

[0080] This invention also proposes a magnesium-based hydride slurry, which is prepared by the method described in any one of the above embodiments. Since this magnesium-based hydride slurry employs all the technical solutions of all the above embodiments, it possesses at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated further here.

[0081] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A method for preparing a magnesium-based hydride slurry, wherein the magnesium-based hydride slurry is used in a concentrated solar power generation system, characterized in that, The preparation method of the magnesium-based hydride slurry includes the following steps: Metallic Ti and metallic Mn were prepared according to the atomic mass ratio of Ti atoms to Mn atoms in TiMn2, and then placed in a high vacuum electric arc melting furnace for melting to obtain magnesium-based hydride catalyst TiMn2; Prepare MgH2 compound and magnesium-based hydride catalyst TiMn2 obtained by smelting according to the first component ratio, and place them in a ball mill jar with an air filling valve. Fill the ball mill jar with stainless steel grinding balls and seal the ball mill jar. Hydrogen gas is introduced into the ball mill jar through the gas filling valve, the ball mill jar is placed into the planetary ball mill, the planetary ball mill is started, and magnesium-based hydride composite material is obtained. The organosilicon oil and the magnesium-based hydride composite material obtained after starting the planetary ball mill were prepared according to the second component ratio and placed in the same container for stirring to obtain magnesium-based hydride slurry.

2. The method for preparing the magnesium-based hydride slurry as described in claim 1, characterized in that, The first composition ratio is: 95-98 wt% MgH2 and 5-2 wt% TiMn2.

3. The method for preparing the magnesium-based hydride slurry as described in claim 1, characterized in that, The second component ratio is: 15-35 wt% silicone oil and 85-65 wt% magnesium-based hydride composite material.

4. The method for preparing the magnesium-based hydride slurry as described in claim 1, characterized in that, The steps of preparing MgH2 compound and magnesium-based hydride catalyst TiMn2 according to the first composition ratio and placing them into a ball mill jar with an air filling valve, filling the ball mill jar with stainless steel grinding balls, and sealing the ball mill jar are carried out in an inert gas environment. And / or, the step of preparing the organosilicon oil and the magnesium-based hydride composite material obtained after starting the plasma ball mill according to the second composition ratio, and then stirring them in the same container to obtain the magnesium-based hydride slurry is carried out in an inert gas environment.

5. The method for preparing the magnesium-based hydride slurry as described in claim 1, characterized in that, The specific steps of preparing metallic Ti and metallic Mn according to the atomic mass ratio of Ti atoms to Mn atoms in TiMn2 and then placing them in a high-vacuum electric arc melting furnace for melting include the following steps: Metallic Ti and metallic Mn are prepared according to the atomic mass ratio of Ti atoms to Mn atoms in TiMn2 and placed in a clean high-vacuum electric arc melting furnace; Vacuum evacuation is performed inside the vacuum arc melting furnace; A small amount of argon gas is introduced into the vacuum arc melting furnace; The vacuum arc melting furnace is started to melt the metallic Ti and metallic Mn in the furnace.

6. The method for preparing the magnesium-based hydride slurry as described in claim 1, characterized in that, Before the step of preparing the MgH2 compound and the smelted magnesium-based hydride catalyst TiMn2 according to the first composition ratio and placing them into a ball mill jar equipped with an air filling valve, Includes the following steps: In an inert gas environment, the obtained magnesium-based hydride catalyst TiMn2 was crushed into small pieces of 1-10 mm using a titanium alloy mortar and pestle. The small pieces were then placed in a high-temperature and high-pressure hydrogen reactor, and hydrogen gas at 4 MPa was introduced to heat the reactor to 350°C.

7. The method for preparing the magnesium-based hydride slurry as described in claim 6, characterized in that, Before the step of preparing the MgH2 compound and the smelted magnesium-based hydride catalyst TiMn2 according to the first composition ratio and placing them into a ball mill jar equipped with an aeration valve, the following steps are also included: The heated small pieces are ground, and the ground powder is then sieved through a 200-mesh sieve.

8. The method for preparing the magnesium-based hydride slurry as described in claim 1, characterized in that, The step of filling the milling jar with stainless steel grinding balls specifically includes: Multiple stainless steel grinding balls with diameters ranging from 2 to 10 mm are loaded into the grinding jar according to a ratio of 20:1 between the mass of the stainless steel grinding balls and the total mass of the MgH2 compound and the magnesium-based hydride catalyst TiMn2 placed in the grinding jar.

9. The method for preparing the magnesium-based hydride slurry as described in claim 1, characterized in that, The steps of filling the milling jar with hydrogen through the gas filling valve, loading the milling jar into the planetary ball mill, starting the planetary ball mill, and obtaining the magnesium-based hydride composite material specifically include the following steps: Repeatedly introduce argon gas into the ball mill jar and evacuate the ball mill jar until the oxygen in the ball mill jar is removed, then introduce hydrogen gas at 10-20 MPa. The grinding jar is loaded into the planetary ball mill; The planetary ball mill is set to intermittent operation mode, with the following operating parameters: 30 minutes of ball mill operation time, 30 minutes of pause time, and a total operating time of 3 to 6 hours. Open the vent valve of the grinding jar to reduce the air pressure inside the grinding jar; Repeatedly introduce argon gas into the grinding jar and evacuate the grinding jar until the hydrogen gas inside the grinding jar is removed; In an inert gas environment, the ball mill jar was opened to remove the magnesium-based hydride composite material.

10. A magnesium-based hydride slurry, characterized in that, The magnesium-based hydride slurry is prepared by the method for preparing magnesium-based hydride slurry as described in any one of claims 1-9.

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