Preparation system of magnesium metal and comprehensive utilization equipment and process of magnesium-containing ore

Abstract

The invention discloses a preparation system of magnesium metal and comprehensive utilization equipment and process of magnesium-containing ore. The preparation system comprises a grinding mechanism; a fluidized calcining mechanism; a digestion mechanism; a carbonization mechanism; an intermediate processing mechanism; a roasting mechanism; and a reduction furnace. The system comprises a grinding mechanism, a fluidized calcination mechanism, a digestion mechanism, a carbonization mechanism, an intermediate treatment mechanism, a roasting mechanism and a reduction furnace which work cooperatively to form a complete magnesium metal production chain. And the grinding mechanism grinds the magnesium-containing ore into a powdery material, so that a proper raw material form is provided for the subsequent calcining process. And then, the fluidized calcining mechanism is used for calcining the powdery material, and the process not only improves the calcining efficiency, but also reduces the energy consumption. According to the design of the whole system, the utilization rate of resources is increased, energy consumption and emission are remarkably reduced, and the industrial problems such as high energy consumption, low resource utilization rate, large slag amount and high emission in the traditional Pidgeon process magnesium smelting process are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of magnesium metal preparation, and in particular to a system for preparing magnesium metal. Background Art

[0002] The chemical composition of dolomite is CaMg(CO3)2, and its crystals are trigonal carbonate minerals. It is an important calcium and magnesium resource ore, and is often used to prepare magnesium metal. The Pidgeon process for magnesium refining refers to a method of adding materials to a reduction tank and using ferrosilicon reducing agents to reduce calcined dolomite to magnesium metal in a reduction furnace heated outside the tank. Although the Pidgeon process is a traditional magnesium refining process, it has industrial problems such as high energy consumption, low resource utilization, large slag volume, and high emissions. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a preparation system of metallic magnesium.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0005] A preparation system of metallic magnesium comprises: a grinding mechanism for grinding magnesium-containing ore to obtain a powdered material; a fluidized calcining mechanism for fluidized calcining the powdered material; a digestion mechanism for digesting the calcined material to obtain a digestion liquid; a carbonization mechanism for carbonizing the digestion liquid to obtain a carbonization reaction liquid; an intermediate treatment mechanism for treating the carbonization reaction liquid to obtain magnesium carbonate; a roasting mechanism for roasting magnesium carbonate solid to obtain magnesium oxide; and a reduction furnace for reducing magnesium oxide to obtain metallic magnesium.

[0006] Furthermore, the grinding mechanism includes: a grinding machine frame; a cylinder, rotatably mounted on the grinding machine frame, with a grinding chamber provided inside, a feed end cover provided at one end, and a discharge end cover provided at the other end, the feed end cover is provided with a feed port, the discharge end cover is provided with a first discharge port, and the peripheral wall of the grinding chamber is provided with an abrasive liner seat; a grinding head spindle, extending into the grinding chamber, a grinding roller is installed at one end extending into the grinding chamber, and the grinding roller and the abrasive liner seat are used to grind the material; a powder selection wheel, rotatably mounted in the grinding chamber and covering the first discharge port, and provided with a surroundingly arranged impeller; a first driving mechanism, used to drive the cylinder to rotate; a second driving mechanism, used to drive the grinding roller to rotate.

[0007] Furthermore, it also includes an axle frame and a movable frame, wherein the movable frame is slidably mounted on the grinding machine frame so that the grinding head spindle and the grinding roller can enter and exit the grinding chamber from the feed port, and the grinding head spindle is mounted on the movable frame; the movable frame is provided with a baffle that can fit with the outer side of the feed end cover, and the baffle is provided with an avoidance hole for the grinding head spindle to pass through; the grinding head spindle is mounted on the axle frame, and the axle frame is connected to the movable frame, and the second driving mechanism is mounted on the axle frame; a swing arm is hinged on the movable frame, and one end of the swing arm is hinged to the axle frame; the inner ring of the abrasive liner is provided with an inwardly recessed circular arc groove, and the outer ring of the grinding roller is provided with an arc protrusion that matches the circular arc groove.

[0008] Furthermore, the fluidized calcining mechanism includes: a roasting furnace, with a hot air inlet pipe and a material inlet pipe at the bottom, and the height of the hot air inlet pipe is lower than the material inlet pipe; a first cyclone separator, the inlet of which is connected to the upper end of the roasting furnace, the upper end is provided with a first air outlet, and the lower end is provided with a first solid outlet; a high-temperature retention bin, used to receive the material output from the first solid outlet and to keep the material warm; a preheating mechanism, connected to the first air outlet, and having a first material output pipe connected to the material inlet pipe; a raw material bin, used to transport materials to the preheating mechanism; a cooling mechanism, used to receive the material output from the high-temperature retention bin and cool the material, and the cooling mechanism is provided with a first hot air outlet, and the first hot air outlet is connected to the bottom of the roasting furnace to transport the hot air formed by exchanging heat with the material to the roasting furnace.

[0009] Furthermore, the carbonization mechanism includes: a tank body, which has a carbonization chamber, a second discharge port is provided at the bottom of the carbonization chamber, and the tank body is connected to a feed pipe connected to the carbonization chamber; a rotary drive mechanism, installed at the upper end of the tank body, and having a rotary output shaft, the rotary output shaft is connected to a stirring shaft, and a stirring blade is installed on the stirring shaft; a shearing knife disc, fixedly installed on the stirring shaft, and a shearing blade is provided on the outer peripheral side, the shearing blade and the shearing knife disc have an angle so that the shearing blade has a force to push the medium to flow downward when rotating with the stirring shaft; an air distribution pipe assembly, installed at the bottom of the carbonization chamber, the air distribution pipe assembly has air distribution holes, and the air distribution pipe assembly is connected to an air inlet pipe extending out of the carbonization chamber.

[0010] Furthermore, the digestion mechanism includes a box body, a driving assembly and a stirring assembly, wherein a first through hole matching the stirring assembly is opened on the top of the box body, a feed hole is opened on the top of the box body, and a discharge hole is opened on the side wall of the box body; the stirring assembly includes a stirring part, and the stirring part extends into the interior of the box body through the first through hole, and the driving assembly drives the stirring assembly to rotate to stir the material in the box body.

[0011] Furthermore, the reduction furnace includes a reduction furnace body, a furnace cover assembly, an electric heating assembly and a magnesium crystallization assembly, wherein the reduction furnace body is formed with a reduction chamber, the reduction furnace body is provided with a slag discharge channel connected to the reduction chamber, the furnace cover assembly is connected to the reduction furnace body, and the furnace cover assembly is provided with a feed channel connected to the reduction chamber; the electric heating assembly is used to heat the material located in the reduction chamber and generate magnesium vapor, and the magnesium crystallization assembly is connected to the reduction chamber through a magnesium vapor conduit to crystallize the magnesium vapor from the reduction chamber.

[0012] Furthermore, it also includes a carbon dioxide collecting device for collecting carbon dioxide gas generated in the fluidized calcining mechanism and the roasting mechanism, and transmitting the collected carbon dioxide gas to the carbonization mechanism.

[0013] Furthermore, it includes a system for preparing the metallic magnesium.

[0014] The present invention also provides a comprehensive utilization process of magnesium-containing ore, comprising the following steps: grinding, grinding the magnesium-containing ore to obtain a powdered material; fluidized calcination, fluidized calcination of the powdered material; digestion, digestion of the calcined material to obtain a digestion liquid; carbonization, carbonization of the digestion liquid to obtain a carbonization reaction liquid; intermediate treatment, treatment of the carbonization reaction liquid to obtain magnesium carbonate; roasting, roasting the magnesium carbonate solid to obtain magnesium oxide; reduction, reduction of the magnesium oxide to obtain metallic magnesium.

[0015] The present invention has the following beneficial effects:

[0016] The system includes a grinding mechanism, a fluidized calcining mechanism, a digestion mechanism, a carbonization mechanism, an intermediate processing mechanism, a roasting mechanism and a reduction furnace. These mechanisms work together to form a complete magnesium metal production chain. The grinding mechanism grinds the magnesium-containing ore into powdery materials, providing a suitable raw material form for the subsequent calcination process. Then, the fluidized calcining mechanism calcines the powdered materials. This process not only improves the calcination efficiency but also reduces energy consumption. The digestion mechanism then digests the calcined materials to generate digestion liquid, which helps to extract the magnesium component in the ore. The carbonization mechanism carbonizes the digestion liquid to generate a carbonization reaction liquid, which further enriches the magnesium element. The intermediate processing mechanism treats the carbonization reaction liquid to obtain magnesium carbonate, which lays the foundation for the subsequent roasting and reduction process. The roasting mechanism roasts the magnesium carbonate solid into magnesium oxide, which improves the purity and quality of the product. Finally, the reduction furnace reduces the magnesium oxide to obtain high-purity magnesium metal. The design of the entire system not only improves resource utilization, but also significantly reduces energy consumption and emissions, solving industrial problems existing in the traditional Pijiang process of magnesium smelting, such as high energy consumption, low resource utilization, large slag volume and high emissions.

[0017] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the overall structure of the grinding mechanism;

[0021] Figure 3 It is a schematic diagram of the structure of the grinding head spindle and the shaft frame;

[0022] Figure 4 It is a schematic diagram of the structure of the powder selection wheel;

[0023] Figure 5 It is a structural schematic diagram of the cylinder of the grinding mechanism;

[0024] Figure 6 It is a schematic diagram of the overall structure of the fluidized calcining mechanism;

[0025] Figure 7 It is a partial structural schematic diagram of the fluidized calcination mechanism;

[0026] Figure 8 It is a structural schematic diagram of the preheating mechanism;

[0027] Fig. 9 It is a schematic diagram of the structure of the cooling mechanism;

[0028] Fig.10 Schematic diagram of the overall structure of the carbonization mechanism;

[0029] Fig.11 It is a schematic diagram of the structure of the shear cutter disc;

[0030] Fig.12 It is a structural schematic diagram of the air distribution pipe assembly;

[0031] Fig.13 yes Fig.12 Sectional view at AA;

[0032] Fig.14 It is a schematic diagram of the structure of the digestive apparatus;

[0033] Fig.15 is a front view schematic diagram of the overall structure of an embodiment of a reduction furnace;

[0034] Fig.16 A side view schematic diagram of the overall structure of an embodiment of a reduction furnace;

[0035] Fig.17 is a structural schematic diagram of a furnace cover assembly in one embodiment of the present invention;

[0036] Fig.18 It is a schematic diagram of the front structure of a magnesium crystal assembly in one embodiment of the present invention. DETAILED DESCRIPTION

[0037] 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.

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0040] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0041] Please refer to Figure 1 A magnesium metal preparation system in a preferred embodiment of the present invention includes a grinding mechanism 100, a fluidized calcining mechanism 200, a fluidized calcining mechanism 200, a digestion mechanism 300, a carbonization mechanism 400, an intermediate processing mechanism 500, a roasting mechanism 600 and a reduction furnace 700.

[0042] The grinding mechanism 100 is used to grind magnesium-containing ore to obtain powdered material. The fluidized calcining mechanism 200 is used to fluidize and calcine the powdered material.

[0043] The digestion mechanism 300 is used to digest the calcined material to obtain a digestion liquid.

[0044] The carbonization mechanism 400 is used to perform carbonization treatment on the digestion liquid to obtain a carbonized reaction liquid.

[0045] The intermediate processing mechanism 500 is used to process the carbonization reaction liquid to obtain magnesium carbonate. The intermediate processing mechanism 500 generally includes a first filtering device, a pyrolysis device, a second filtering device and a drying device. First, the carbonization reaction liquid is filtered by the first filtering device to filter out the calcium carbonate precipitate therein to obtain heavy magnesium water, and then the heavy magnesium water is pyrolyzed by the pyrolysis device, and the pyrolysis reaction liquid is subjected to solid-liquid separation to obtain the decomposed liquid and the second solid separator; the second solid separator contains magnesium carbonate. The pyrolyzed liquid is filtered by the second filtering device to obtain magnesium carbonate solid. Finally, the magnesium carbonate solid obtained after pyrolysis is dried by the drying device.

[0046] The roasting mechanism 600 is used to roast the magnesium carbonate solid to obtain magnesium oxide.

[0047] The reduction furnace 700 is used to perform a reduction treatment on magnesium oxide to obtain metallic magnesium. The reduction treatment is performed in the reduction furnace 700, and the reduction treatment includes: pressing the magnesium oxide and the aluminum powder into pellets, preheating the pellets to 400-600°C, and then performing vacuum reduction to obtain the metallic magnesium and the magnesium-aluminum spinel; the temperature of the vacuum reduction is 1100-1200°C, the duration of the vacuum reduction is 2-4h, and the vacuum degree of the vacuum reduction is controlled at 2-5Pa.

[0048] The present invention provides a preparation system of magnesium metal, comprising a grinding mechanism 100, a fluidized calcining mechanism 200, a digestion mechanism 300, a carbonization mechanism 400, an intermediate processing mechanism 500, a roasting mechanism 600 and a reduction furnace 700, which work together to form a complete magnesium metal production chain. The grinding mechanism 100 grinds the magnesium-containing ore into a powdered material, providing a suitable raw material form for the subsequent calcination process. Then, the fluidized calcining mechanism 200 calcines the powdered material, which not only improves the calcination efficiency but also reduces energy consumption. The digestion mechanism 300 then digests the calcined material to generate a digestion liquid, which helps to extract the magnesium component in the ore. The carbonization mechanism 400 carbonizes the digestion liquid to generate a carbonization reaction liquid, which further enriches the magnesium element. The intermediate processing mechanism 500 processes the carbonization reaction liquid to obtain magnesium carbonate, which lays the foundation for the subsequent roasting and reduction processes. The roasting mechanism 600 roasts the magnesium carbonate solid into magnesium oxide, which improves the purity and quality of the product. Finally, the reduction furnace 700 reduces the magnesium oxide to obtain high-purity metallic magnesium. The design of the entire system not only improves the utilization rate of resources, but also significantly reduces energy consumption and emissions, solving the industrial problems existing in the traditional Pijiang process of magnesium refining, such as high energy consumption, low resource utilization, large slag volume and high emissions.

[0049] Reference Figures 2 to 5 In some embodiments of the present invention, the grinding mechanism 100 includes a grinding machine frame 1100, a cylinder 1200, a grinding head spindle 1300, a powder selection wheel 1400, a first driving mechanism 1500 and a second driving mechanism 1600.

[0050] The cylinder 1200 is rotatably mounted on the grinding machine frame 1100, and a grinding chamber 1210 is provided inside the cylinder 1200. A feed end cover 1220 is provided at one end of the cylinder 1200, and a discharge end cover 1230 is provided at the other end. A feed port 1221 is provided on the feed end cover 1220, and a first discharge port 1231 is provided on the discharge end cover 1230. An abrasive liner 1240 is provided on the peripheral wall of the grinding chamber 1210. The grinding head spindle 1300 extends into the grinding chamber 1210, and a grinding roller 1310 is installed at one end of the grinding head spindle 1300 extending into the grinding chamber 1210. The grinding roller 1310 cooperates with the abrasive liner 1240 to grind the material. The powder selection wheel 1400 is rotatably mounted in the grinding chamber 1210 and covers the first discharge port 1231. The powder selection wheel 1400 is provided with impellers 1410 arranged around it. The first driving mechanism 1500 is used to drive the cylinder 1200 to rotate; the second driving mechanism 1600 is used to drive the grinding roller 1310 to rotate. It is understandable that the device also includes a third driving mechanism for driving the powder selection wheel 1400 to rotate. By adjusting the rotation speed of the powder selection wheel 1400, the particle size screening can be adjusted. The faster the rotation speed, the smaller the particle size. By adopting the cylinder 1200, the grinding head spindle 1300, the powder selection wheel 1400 and the corresponding driving mechanism, the grinding efficiency and the narrow distribution of the powder particle size are significantly improved. When grinding, not only the grinding roller 1310 rotates, but also the cylinder 1200 and the abrasive liner 1240 rotate, so that the material surges in the grinding chamber 1210, the material is fully ground, the grinding effect is enhanced, and the grinding efficiency is significantly improved; and when the material particles are large, there is a speed difference between the rotation speed of the grinding roller 1310 and the rotation speed of the cylinder 1200, which will form shear crushing to ensure the crushing effect. The design of the powder selection wheel 1400 ensures the uniformity of the particle size of the discharge material by screening the impeller 1410 arranged in a surrounding manner, reduces the problem of too wide particle size distribution of the powder in the traditional grinding mill, solves the consistency of the control parameters of fluidized roasting, improves the stability of the calcination quality, and reduces the final tail gas dust removal pressure of the fluidized roasting system. The powder particle size distribution is uniform, and each particle is heated evenly during the fluidized roasting process, avoiding local over-burning or under-burning, and improving the stability of the calcination quality; the abrasive liner 1240 effectively protects the cylinder 1200, reduces equipment wear, extends the service life of the equipment, and reduces maintenance costs. It is understandable that the abrasive liner 1240 can be detachably installed in the cylinder 1200 to facilitate subsequent disassembly and replacement.

[0051] In some embodiments of the present invention, the shaft frame 1700 and the mobile frame 1800 are also included. The mobile frame 1800 is slidably mounted on the grinding machine frame 1100 so that the grinding head spindle 1300 and the grinding roller 1310 can enter and exit the grinding chamber 1210 from the feed port 1221. The grinding head spindle 1300 is mounted on the mobile frame 1800. The profile of the grinding head spindle 1300 and the grinding roller 1310 is smaller than the feed port 1221. The material can enter the grinding chamber 1210 from the gap, making the overall structure more streamlined. Specifically, a slide rail 1130 is set on the grinding machine frame 1100, and a roller 1830 rollingly mounted on the slide rail 1130 is provided at the bottom of the mobile frame 1800, so as to facilitate the movement of the mobile frame 1800. The movable frame 1800 is provided with a baffle 1810 which can fit with the outer side of the feed end cover 1220. The baffle 1810 is provided with an avoidance hole 1811 for the grinding head spindle 1300 to pass through. The baffle 1810 can block a part of the feed port 1221, so as to avoid the feed port 1221 being exposed too much during grinding, thereby preventing the material from diffusing out of the feed port 1221.

[0052] The grinding head spindle 1300 is mounted on the shaft frame 1700, the shaft frame 1700 is connected to the mobile frame 1800, and the second driving mechanism 1600 is mounted on the shaft frame 1700. Specifically, one end of the grinding head spindle 1300 extending into the grinding chamber 1210 is rotatably sleeved with a rotating mounting frame 1320, a bearing is provided between the rotating mounting frame 1320 and the grinding head spindle 1300, and the grinding roller 1310 is sleeved on the outer periphery of the rotating mounting frame 1320, and the grinding roller 1310 is detachably connected to the rotating mounting frame 1320 to facilitate disassembly and replacement after wear. The grinding head spindle 1300 is fixedly connected to the shaft frame 1700. A driven gear 1321 is provided on the rotating mounting frame 1320, and the second driving mechanism 1600 is a motor, and the output shaft of the motor is provided with an output gear meshing with the driven gear 1321, thereby driving the grinding roller 1310 to rotate. It is understandable that a speed reducer is also provided between the output shaft of the motor and the output gear to achieve transmission connection, thereby reducing the rotation speed of the output shaft of the motor.

[0053] The movable frame 1800 is hinged with a swing arm 1820, the middle part of the swing arm 1820 is hinged with the movable frame 1800, and one end of the swing arm 1820 is hinged with the shaft frame 1700, so that the height of the shaft frame 1700, the grinding head spindle 1300 and the grinding roller 1310 can be controlled by swinging the swing arm 1820. When grinding, the grinding roller 1310 can be driven to press down so that it has sufficient rolling force to improve the grinding efficiency. When it is necessary to leave the grinding chamber 1210, the grinding roller 1310 can be lifted up first and then pulled out of the grinding chamber 1210. Specifically, Figure 2 and 3As shown, a hinge ear 1710 is provided at the bottom of the shaft frame 1700 for the swing arm 1820 to be hinged, and a pressurizing cylinder 1840 and a maintenance cylinder 1850 are installed on the movable frame 1800. The pressurizing cylinder 1840 is used to drive the grinding roller 1310 of the shaft frame 1700 to move toward the abrasive liner 1240 to apply pressure to the material; the moving path of the telescopic shaft of the pressurizing cylinder 1840 is located at the end of the swing arm 1820 away from the shaft frame 1700, so that when pressure is needed, the telescopic shaft of the pressurizing cylinder 1840 can move upward to push the swing arm 1820 to swing and finally drive the grinding roller 1310 to move toward the abrasive liner 1240 to apply pressure to the material, so that there is sufficient crushing force, thereby improving the grinding efficiency and effect. The maintenance oil cylinder 1850 drives the grinding roller 1310 of the shaft frame 1700 away from the abrasive liner 1240. Specifically, one end of the maintenance oil cylinder 1850 is hinged to the movable frame 1800, and the other end is hinged to the hinge ear 1710, so that the grinding roller 1310 can be pushed up to separate from the abrasive liner 1240, so as to facilitate the grinding roller 1310 to exit the grinding chamber 1210 horizontally. In addition, when the maintenance oil cylinder 1850 is in a retracted state, the pressurizing stroke of the pressurizing oil cylinder 1840 pushing the grinding roller 1310 downward can be limited to avoid contact between the grinding roller 1310 and the abrasive liner 1240. Before the grinding roller 1310 is not fed with materials, there must be a 10 mm gap between the grinding roller 1310 and the abrasive liner 1240, otherwise the friction between the materials of the two will cause damage and contaminate the product. The inner ring of the abrasive liner 1240 is provided with an inwardly sunken arc groove 1241, and the outer ring of the grinding roller 1310 is provided with an arc protrusion 1311 adapted to the arc groove 1241, thereby increasing the grinding area, and the material will automatically gather toward the bottom of the arc groove 1241 and be ground by the grinding roller 1310, thereby improving the grinding efficiency.

[0054] In a further embodiment of the present invention, a discharge piece 1110 located on the outside of the discharge end cover 1230 is provided on the grinding machine frame 1100, and the discharge piece 1110 is covered on the outside of the first discharge port 1231. The discharge piece 1110 is formed with a discharge channel 1111 connected to the first discharge port 1231. The discharge channel 1111 can be connected to a negative pressure suction device, thereby forming a negative pressure in the grinding chamber 1210, so that the powder is discharged from the first discharge port 1231 to the discharge channel 1111 along the airflow, and flows into the subsequent device.

[0055] In a further embodiment of the present invention, the center of the powder selection wheel 1400 is fixedly connected to the powder selection shaft 1420, and the powder selection shaft 1420 is rotatably mounted on the discharge piece 1110. The center of the discharge end cover 1230 is provided with a center hole for the powder selection shaft 1420 to pass through. The powder selection shaft 1420 extends out of the discharge piece 1110 at one end away from the grinding chamber 1210 and is connected to a transmission wheel 1421. The third driving mechanism can be a motor, and the output shaft of the motor is connected to a driving wheel. The driving wheel and the transmission wheel 1421 can be driven by a material strip or a transmission belt, thereby driving the powder selection wheel 1400 to rotate. Specifically, end plates are provided at the front and rear ends of the impellers to realize the connection of all impellers and ensure the structural strength of the impellers. The end plate 1430 facing the first discharge port 1231 is provided with a material port 1431 corresponding to the first discharge port 1231 for the powder to pass through.

[0056] In a further embodiment of the present invention, a gear ring 1250 is provided on the outer periphery of the cylinder 1200, and the first driving mechanism 1500 is a motor fixedly mounted on the grinding machine frame 1100, and the output shaft of the motor is connected to a driving gear 1510 meshing with the gear ring 1250, thereby driving the cylinder 1200 to rotate. The grinding machine frame 1100 is rotatably mounted with a supporting wheel 1120 supporting the cylinder 1200, thereby reducing the rotational friction of the cylinder 1200.

[0057] Reference Figures 6 to 9 In some embodiments of the present invention, the fluidized calcining mechanism 200 includes a calcining furnace 2100, a first cyclone separator 2200, a high-temperature retention bin 2300, a preheating mechanism 2400, a raw material bin 2500 and a cooling mechanism 2600.

[0058] A hot air inlet pipe 2110 and a material inlet pipe 2120 are provided at the bottom of the calcining furnace 2100, and the height of the hot air inlet pipe 2110 is lower than the material inlet pipe 2120. The inlet of the first cyclone separator 2200 is connected to the upper end of the calcining furnace 2100, and the upper end of the first cyclone separator 2200 is provided with a first air outlet 2210, and the lower end of the first cyclone separator 2200 is provided with a first solid outlet 2220. The hot air output from the upper end of the calcining furnace 2100 carries powder particles into the first cyclone separator 2200. Under the separation action of the first cyclone separator 2200, the hot air is output from the first air outlet 2210, and the powder particles are output from the first solid outlet 2220. The cyclone separator generally includes an inlet, an air outlet, and a solid outlet. The inlet and outlet are connected to the gas-solid mixed medium. After the action of the cyclone separator, the gas is discharged from the air outlet, and the solid powder particles are discharged from the solid outlet. The high temperature retention bin 2300 is used to receive the material output from the first solid outlet 2220 and keep the material warm. Avoid the material from cooling rapidly and recombining with carbon dioxide to cause recovery, resulting in incomplete calcination. The preheating mechanism 2400 is connected to the first air outlet 2210 and has a first material output pipe 24021 connected to the material inlet pipe 2120. The raw material bin 2500 is used to transport materials to the preheating mechanism 2400. The preheating mechanism 2400 receives the hot air output from the first air outlet 2210 and preheats the material entering it, thereby realizing the preheating of the raw material using waste heat. The cooling mechanism 2600 is used to receive the material output from the high temperature retention bin 2300 and cool the material. The cooling mechanism 2600 is provided with a first hot air outlet 2610, and the first hot air outlet 2610 is connected to the bottom of the calcining furnace 2100 to transport the hot air formed by exchanging heat with the material to the calcining furnace 2100.

[0059] The calcining furnace 2100 is provided with a hot air inlet pipe 2110 and a material inlet pipe 2120 at the bottom. The hot air inlet pipe 2110 is lower than the material inlet pipe 2120, which will cause the material to surge upward, so that the hot air can fully contact the material, improve the thermal energy utilization efficiency, and reduce energy consumption; the calcined material is kept warm by the high-temperature retention bin 2300 to prevent the material from cooling rapidly and combining with carbon dioxide to recover, which affects the calcining effect; the cooling mechanism 2600 is provided with a first hot air outlet, which is connected to the bottom of the calcining furnace 2100, and the cooling process is The hot air generated in the process is returned to the calcining furnace 2100, which realizes the effective recovery and reuse of waste heat and further reduces the overall energy consumption; the hot air separated from the first air outlet 2210 is sent to the preheating mechanism 2400 to preheat the raw materials entering the preheating mechanism 2400, thereby improving the utilization of waste heat and reducing energy consumption. The preheated materials enter the calcining furnace 2100, which can effectively improve the roasting efficiency and effect. The present invention realizes the automatic processing of materials, improves the automation level of the system, reduces manual operation and improves production efficiency.

[0060] A powder output pipe 2310 and a particle output pipe 2320 are provided at the bottom of the high temperature retention bin 2300. It can be understood that the material with a larger particle size is output from the particle output pipe 2320, and the material with a smaller particle size is output from the powder output pipe 2310. In order to reduce the powder entering the particle output pipe 2320, a fan blowing toward the powder output pipe 2310 can be provided at the bottom of the high temperature retention bin 2300, so that most of the powder enters the powder output pipe 2310 with the air flow, while the particles with a larger particle size are not easily blown by the air flow, and the particles can fall into the particle output pipe 2320 by their own gravity. The powder output pipe 2310 is connected to the cooling mechanism 2600, and the particle output pipe 2320 is connected to the circulating calcining furnace 2330, and the circulating calcining furnace 2330 is provided with a second material output pipe 2331 connected to the cooling mechanism 2600. In order to prevent the particles from entering the powder output pipe 2310, a filter plate for filtering the particles can be provided at the upper end of the powder output pipe 2310, so that the particles cannot enter the powder output pipe 2310, and the particles fall into the particle output pipe 2320. Specifically, the circulating calcining furnace 2330 includes a furnace body 2332 and a circulating transition device 2333. The furnace body 2332 is connected to the particle output pipe 2320, so that the particles continue to be calcined so that the particles can react completely. The upper end of the furnace body 2332 is connected to the circulating transition device 2333. One side of the circulating transition device 2333 is provided with a circulating input port connected to the lower half of the furnace body 2332, so as to realize the circulating treatment of the particles. It can be understood that hot air will be introduced into the furnace body 2332 to drive the particles to flow. The second material output pipe 2331 is connected to the circulating transition device 2333. After a period of reaction, the material can be output from the second material output pipe 2331. A control valve may be provided at the upper end of the second material output pipe 2331 to achieve material output control.

[0061] Reference Fig. 9In some embodiments of the present invention, the cooling mechanism 2600 includes a second cyclone separator 2620 and a first feed pipe 2630; the inlet of the second cyclone separator 2620 is connected to the first feed pipe 2630, and the second material output pipe 2331 and the powder output pipe 2310 are connected to the first feed pipe 2630, so that the powder material is sent into the second cyclone separator 2620 through the first feed pipe 2630 for cooling treatment. The first hot air outlet 2610 is the air outlet of the second cyclone separator 2620. After the second cyclone separator 2620 contacts the powder material with residual heat, part of the heat can be taken away to achieve cooling of the powder material. At the same time, the hot air that absorbs the heat is discharged from the first hot air outlet 2610 and finally sent to the bottom of the calcining furnace 2100. The cooling mechanism 2600 further includes a third cyclone separator 2640 and a fourth cyclone separator 2650; the air outlet of the third cyclone separator 2640 is connected to the first feed pipe 2630, thereby supplying air to the first feed pipe 2630, driving the powder particles into the second cyclone separator 2620. The solid outlet of the second cyclone separator 2620 and the air outlet of the fourth cyclone separator 2650 are connected to the inlet of the third cyclone separator 2640; the inlet of the fourth cyclone separator 2650 is connected to the second feed pipe 2660, the second feed pipe 2660 is used to pass air, and the solid outlet of the third cyclone separator 2640 is connected to the second feed pipe 2660. Specifically, the solid outlet of the third cyclone separator 2640 is connected to the middle of the second feed pipe 2660, and the end of the second feed pipe 2660 is connected to an air pump to charge gas. The third cyclone separator 2640 and the fourth cyclone separator 2650 are used for multi-stage cooling, and the hot air generated after cooling can enter the second cyclone separator 2620 in sequence, and finally be discharged from the outlet of the second cyclone separator 2620 to the calcining furnace 2100, thereby realizing efficient waste heat utilization.

[0062] In a further embodiment of the present invention, a conveying mechanism 2700, an elevator 2710 and a cost bin 2720 are further included. The conveying mechanism 2700 is used to receive the solid powder output from the solid outlet of the fourth cyclone separator 2650 and convey the solid powder to the elevator 2710. The elevator 2710 is used to convey the solid powder to the cost bin 2720. The solid outlet of the fourth cyclone separator 2650 is connected to the third material output pipe 2670. The conveying mechanism 2700 receives the material output from the third material output pipe 2670, and uses the elevator 2710 to convey the material to the cost bin 2720 for storage, thereby realizing automated operation.

[0063] In a further embodiment of the present invention, a dryer 2800 is further included; the preheating mechanism 2400 has a second hot air outlet 2410, which is connected to the dryer 2800, and the dryer 2800 has an input port 2810 for the raw material bin 2500 to input raw materials. Specifically, a screw feeder 2510 is provided at the bottom of the raw material bin 2500, and the screw feeder 2510 is used to input the material from the input port 2810 to the dryer 2800. The material in the raw material bin 2500 falls into the screw feeder 2510, and the screw feeder 2510 feeds the material into the input port 2810 through the rotation of the internal screw, which is actually automatic feeding. The output port of the dryer 2800 is connected to a third output pipe 2820, and the third output pipe 2820 is connected to the preheating mechanism 2400. The residual heat of the second hot air outlet 2410 is used to preliminarily preheat the raw material, and the dryer 2800 can absorb the moisture in the raw material to reduce the influence of moisture on subsequent processes.

[0064] In a further embodiment of the present invention, the preheating mechanism 2400 includes a fifth cyclone separator 2420 and a sixth cyclone separator 2430, the inlet of the fifth cyclone separator 2420 is connected to the third output pipe 2820; the inlet of the sixth cyclone separator 2430 is connected to the third feed pipe 2431, the third feed pipe 2431 is connected to the first air outlet 2210, the solid outlet of the fifth cyclone separator 2420 is connected to the third feed pipe 2431, the second hot air outlet 2410 is the air outlet of the sixth cyclone separator 2430, and the solid outlet of the sixth cyclone separator 2430 is connected to the first material output pipe 24021. The hot air output from the air outlet of the sixth cyclone separator 2430 is used to transport the waste heat to the dryer 2800, so as to make full use of the waste heat and improve the energy utilization efficiency. The fifth cyclone separator 2420 and the sixth cyclone separator 2430 are used to fully preheat the material in multiple stages. The preheating mechanism 2400 further includes a seventh cyclone separator 2440. It can be understood that the third feed pipe 2431 is connected to the first air outlet 2210 through the seventh cyclone separator 2440; the solid outlet of the sixth cyclone separator 2430 is connected to the first material output pipe 24021 through the seventh cyclone separator 2440. The inlet of the seventh cyclone separator 2440 is connected to the first air outlet 2210 through the fourth feed pipe 2441, the solid outlet of the sixth cyclone separator 2430 is connected to the fourth feed pipe 2441, the air outlet of the seventh cyclone separator 2440 is connected to the third feed pipe 2431, and the solid outlet of the seventh cyclone separator 2440 is connected to the first material output pipe 24021. The seventh cyclone separator 2440 is used to increase the time for preheating the material and improve the preheating effect of the material.

[0065] In a further embodiment of the present invention, the air outlet of the fifth cyclone separator 2420 is connected to a bag dust collector 2900, and the bag dust collector 2900 is used to remove dust from the output exhaust gas to avoid air pollution.

[0066] Reference Figures 10 to 13 In some embodiments of the present invention, the carbonization mechanism 400 includes a tank body 4100 , a rotary drive mechanism 4200 , a shearing blade 4300 , and an air distribution pipe assembly 4400 .

[0067] The tank body 4100 has a carbonization chamber 4110, and a second discharge port 4111 is provided at the bottom of the carbonization chamber 4110. A valve can be installed at the second discharge port 4111 to control the discharge. The tank body 4100 is connected to a feed pipe 4120 that is in communication with the carbonization chamber 4110. The rotary drive mechanism 4200 is installed at the upper end of the tank body 4100, and the rotary drive mechanism 4200 has a rotary output shaft 4210, and the rotary output shaft 4210 is connected to a stirring shaft 4220, and a stirring blade 4230 is installed on the stirring shaft 4220. The shearing disc 4300 is fixedly mounted on the stirring shaft 4220, and a shearing blade 4320 is provided on the outer peripheral side of the shearing disc 4300. The shearing blade 4320 and the shearing disc 4300 have an angle, so that the shearing blade 4320 has a force to push the medium to flow downward when rotating with the stirring shaft 4220, so that the floating speed of the gas is slowed down, and the gas is fully contacted and reacted with the raw material liquid; specifically, the shearing disc 4300 is arranged horizontally, and the shearing blade 4320 is arranged obliquely with the horizontal plane, so that the inclined shearing blade 4320 can bevel the bubbles when rotating, break up the bubbles, and make the carbon dioxide gas fully mix and react with the raw material. The gas distribution pipe assembly 4400 is installed at the bottom of the carbonization chamber 4110, and the gas distribution pipe assembly 4400 has a gas distribution hole 4410, and the gas distribution pipe assembly 4400 is connected to the air inlet pipe 4420 extending out of the carbonization chamber 4110. The feed pipe 4120 is used to transport raw materials into the carbonization chamber 4110. The rotary drive mechanism 4200 drives the stirring shaft 4220 and the stirring blade 4230 to rotate by rotating the output shaft 4210, thereby achieving stirring of the medium in the carbonization chamber 4110, so that the carbon dioxide gas can fully contact and react with the raw materials, thereby improving the carbonization efficiency and uniformity. The shearing knife disc 4300 is fixed to the stirring shaft 4220, rotates with the stirring shaft 4220, and drives the shearing blade 4320 to rotate, thereby rotary cutting the medium, breaking up the bubbles, allowing the bubbles to more fully contact and react with the raw materials, enhancing the mixing reaction effect of the carbon dioxide gas and the raw materials, and further improving the carbonization efficiency.

[0068] In some embodiments of the present invention, the air outlet direction of the air distribution hole 4410 is downward and inclined in the direction away from the stirring shaft 4220, that is, the air outlet direction of the air distribution hole 4410 is downward and inclined and expanded outward, so that the bubbles are thrown outward at an angle, and the downward air outlet can effectively reduce the solid matter from entering the air distribution pipe assembly 4400 and clogging the air distribution hole 4410, thereby effectively reducing the frequency of equipment maintenance and cleaning.

[0069] In some embodiments of the present invention, the air distribution pipe assembly 4400 includes a plurality of annular pipes 4430 that are concentrically spaced apart, and the air distribution holes 4410 are formed on the peripheral wall of the annular pipe 4430 and are arranged and distributed circumferentially along the annular pipe 4430, thereby realizing an annular array arrangement of the air distribution holes 4410, thereby improving the uniformity of aeration, making the raw materials contact with the carbon dioxide gas as much as possible, and reacting evenly, and the plurality of annular pipes 4430 are connected by a connector 4440, thereby connecting the plurality of annular pipes 4430 to facilitate overall installation.

[0070] Of course, in some embodiments, the connecting piece 4440 can be a connecting pipe, so as to connect multiple annular tubes 4430 so that the multiple annular tubes 4430 can ventilate each other, so that the air inlet pipe 4420 only needs to be connected to one annular tube 4430 to realize air supply to all the annular tubes 4430.

[0071] In some embodiments of the present invention, two groups of stirring blades 4230 are provided and spaced apart from each other, and the upper and lower groups of stirring blades 4230 have opposite rotation directions. The upper stirring blades 4230 rotate downward so as to have a force to push the medium to flow downward during rotation, thereby delaying the time for bubbles to float up, increasing the contact time between bubbles and raw materials, and improving the reaction efficiency. The lower stirring blades 4230 are arranged above the air distribution pipe assembly 4400. The stirring of the lower stirring blades 4230 can effectively reduce the deposition of fixed substances on the air distribution pipe assembly 4400, thereby reducing the frequency of equipment cleaning and maintenance.

[0072] In some embodiments of the present invention, a plurality of shear blades 4300 are arranged at intervals along the vertical direction, so as to stir and disperse the bubbles at multiple positions, thereby improving the efficiency of the carbonization reaction.

[0073] In some embodiments of the present invention, the shearing blade 4300 includes two semi-discs 4310, and a half sleeve 4311 is provided in the center of the semi-disc 4310. The half sleeves 4311 on the two semi-discs 4310 are connected and fixed and wrap and fix the stirring shaft 4220. The shearing blades 4320 are arranged around the arc edge of the semi-disc 4310, so that the shearing blade 4300 can be easily installed on the stirring shaft 4220. During disassembly and installation, there is no need to insert it from the end of the stirring shaft 4220, and it is not affected by the stirring blades 4230. During installation, the two semi-discs 4310 can be directly installed at the corresponding height of the stirring shaft 4220, and the installation is simple and convenient.

[0074] In a further embodiment of the present invention, connecting plates 4312 are provided on both sides of the half sleeve 4311, and the connecting plates 4312 are provided with connecting holes. The connecting holes on the connecting plates 4312 on the two half sleeves 4311 are aligned and fasteners are installed. The fasteners can be bolts and nuts, so as to clamp and fix the connecting plates 4312 on the two half sleeves 4311. The two half sleeves 4311 are spliced ​​and fixed by using the connecting plates 4312 on both sides and the fasteners.

[0075] In a further embodiment of the present invention, two corresponding half sleeves 4311 and the stirring shaft 4220 are provided with corresponding holes for connection and fixation by fasteners, the fasteners are bolts 4330 and nuts, and the half sleeves 4311 and the stirring shaft 4220 are provided with holes for the bolts to pass through. The bolts 4330 pass through the holes on the two half sleeves 4311 and the stirring shaft 4220 and are connected and fixed with the nuts, thereby realizing the connection and fixation of the two half sleeves 4311 and the stirring shaft 4220, and the shearing cutter disc 4300 is installed in a positioned manner by aligning the holes and inserting the bolts 4330, and the synchronous rotation of the stirring shaft 4220 and the shearing cutter disc 4300 is realized, thereby realizing stable torque transmission.

[0076] In some embodiments of the present invention, the upper half of the tank body 4100 is connected to a pressure relief pipe 4130 in communication with the carbonization chamber 4110, and a pressure relief valve 4131 is installed on the pressure relief pipe 4130. The pressure relief valve 4131 can set the pressure relief pressure, so that when air continuously enters the carbonization chamber 4110, it will accumulate in the carbonization chamber 4110. The pressure relief valve 4131 can avoid the difficulty of air intake caused by excessive gas pressure. When the gas is higher than the set pressure, the pressure relief valve 4131 will open the pressure relief valve, thereby forming a stable air pressure environment in the carbonization chamber 4110. The air pressure is greater than the atmospheric pressure. The high-pressure environment can effectively improve the efficiency of carbonization.

[0077] In some embodiments of the present invention, an overflow pipe 4140 connected to the carbonization chamber 4110 is connected to the upper half of the tank body 4100, and the overflow pipe 4140 extends to the height position of the lower half of the tank body 4100. An overflow valve 4141 is installed on the overflow pipe 4140. When the feed pipe 4120 enters the raw material, the overflow valve 4141 can be opened to avoid excessive raw materials in the carbonization chamber 4110. After stopping adding raw materials, the overflow valve 4141 can be closed to form a stable air pressure environment in the carbonization chamber 4110 to prevent gas from overflowing from the overflow pipe 4140.

[0078] Reference Fig.14 In some embodiments of the present invention, the digestion mechanism 300 includes a box body 3100, a driving assembly 3200 and a stirring assembly, wherein a first through hole (not shown) matching the stirring assembly is opened on the top of the box body 3100, a feeding hole is opened on the top of the box body 3100, and a discharge hole 3120 is opened on the side wall of the box body 3100; the stirring assembly includes a stirring part 3300, and the stirring part 3300 extends into the interior of the box body 3100 through the first through hole, and the driving assembly 3200 drives the stirring assembly to rotate to stir the material in the box body 3100.

[0079] Specifically, the box body 3100 is the main part of the digester, which is used to accommodate materials that need to be stirred and digested; the driving component 3200 provides power to drive the rotation of the stirring component; the feed hole is used to add materials into the box body 3100; the discharge hole 3120 is used to discharge the processed materials after the stirring and digestion process is completed.

[0080] When stirring is required, the driving component 3200 is started, and the stirring part 3300 rotates in the box 3100 to stir the material. The coordinated work of the driving component 3200 and the stirring component can effectively stir the material in the box 3100 to make it evenly mixed and improve the stirring efficiency.

[0081] As a preferred embodiment, the driving assembly 3200 is connected to the top of the box 3100, and the driving assembly 3200 includes a driving motor. When the driving motor is started, the output shaft of the driving motor starts to rotate, the stirring assembly starts to rotate, and the stirring part 3300 rotates in the box 3100 to stir the material; the output shaft of the driving motor is directly or through a coupling connected to the stirring assembly, which reduces the loss in the power transmission process and improves the stirring efficiency.

[0082] As a preferred embodiment, the stirring assembly includes a main shaft 3310 and a stirring part 3300, wherein the upper end of the main shaft 3310 is connected to the output shaft of the driving motor through a coupling, and the stirring part 3300 is connected to the lower end of the main shaft 3310 and rotates synchronously with the main shaft 3310. The stirring part 3300 includes blades, which are fixedly mounted on the main shaft 3310.

[0083] As a preferred embodiment, a baffle plate 3130 is provided on the inner wall of the box body 3100, and the baffle plate 3130 and the blade assembly are arranged at intervals. By providing the baffle plate 3130 on the inner wall of the box body 3100, the flow direction of the fluid in the box body 3100 can be changed, and the fluid in the box body 3100 can be prevented from presenting eddy currents in the form of concentric circles, thereby improving the friction and shearing effect between the fluids.

[0084] Furthermore, a ventilation cylinder 3140 is provided on the top of the box 3100 to connect the inside and outside of the box 3100. Specifically, the ventilation cylinder 3140 allows the air inside the box 3100 to be exchanged with the outside air. Since the digestion process releases water vapor, the water vapor is discharged in time through the ventilation cylinder 3140, thereby balancing the air pressure inside the box 3100.

[0085] Reference Figures 15 to 18 In some embodiments of the present invention, the reduction furnace 700 includes a reduction furnace body 7100, a furnace cover assembly 7200, an electric heating assembly 7300 and a magnesium crystallization assembly 7400, wherein the reduction furnace body 7100 is formed with a reduction chamber 7110, the reduction furnace body 7100 is provided with a slag discharge channel 7120 connected to the reduction chamber 7110, the furnace cover assembly 7200 is connected to the reduction furnace body 7100, and the furnace cover assembly 7200 is provided with a feed channel 7210 connected to the reduction chamber 7110; the electric heating assembly 7300 is used to heat the material located in the reduction chamber 7110 and generate magnesium vapor, and the magnesium crystallization assembly 7400 is connected to the reduction chamber 7110 through a magnesium vapor conduit to crystallize the magnesium vapor from the reduction chamber 7110.

[0086] Specifically, the reduction chamber 7110 is where the material is heated and reduced. The material is preferably magnesium oxide mixed with an aluminum-containing reducing agent and pressed into pellets. The reduction furnace body 7100 is provided with a slag discharge channel 7120 connected to the reduction chamber 7110 for discharging waste or residue after the reaction; the furnace cover assembly 7200 is provided with a feed channel 7210 connected to the reduction chamber 7110 for adding reaction materials into the reduction chamber 7110; the electric heating assembly 7300 is a heating system of the equipment, which is used to heat the material in the reduction chamber 7110. The electric heating assembly 7300 can adopt existing mature equipment as long as it can effectively heat the material; during the heating process, the material will undergo a reduction reaction to generate magnesium vapor; the magnesium crystallization assembly 7400 is used to crystallize the magnesium vapor, and the magnesium vapor conduit connects the reduction chamber 7110 and the magnesium crystallization assembly 7400, so that the magnesium vapor can be transported from the reduction chamber 7110 to the magnesium crystallization assembly 7400 for crystallization.

[0087] The present application scheme efficiently heats the material through the electric heating component 7300 so that it quickly reaches the temperature required for the reduction reaction, thereby accelerating the reduction reaction, and the heating time can be shortened to 72-74 hours. Since the material and the electric heating component 7300 are in the reduction chamber 7110, compared with the existing external heating method, there can be a larger material reaction space, the reduction is more thorough, the output rate is higher, and the electric (clean energy) heating method is adopted to effectively reduce pollution, stable and fast. In a preferred embodiment, the design of the present application enables the addition of materials, the discharge of waste materials and the crystallization of magnesium vapor to be achieved through certain automated equipment, for example, automatic slag removal can be achieved, which improves production efficiency and ease of operation (the external heating method of the prior art basically adopts manual feeding and slag removal).

[0088] As a preferred embodiment, the magnesium crystallization component 7400 includes a crystallization tank 7410, a crystal attachment body 7440 and an end cover 7450, wherein the crystallization tank 7410 is formed with a cooling space 7411, the crystallization tank 7410 is fixedly connected (preferably welded) to the side wall of the reduction furnace body 7100, the crystallization tank 7410 is provided with an outlet connected to the cooling space 7411, the end cover 7450 can be connected to the crystallization tank 7410 in an openable and closable manner, the inner cavity of the crystal attachment body 7440 is connected to the reduction chamber 7110 through the magnesium vapor conduit; the crystal attachment body 7440 is arranged in the cooling space 7411 for attachment of crystallized magnesium, and the crystals are attached to the inner wall of the crystal attachment body 7440.

[0089] Specifically, in the reduction chamber 7110 of the reduction furnace body 7100, the material is heated by the electric heating component 7300 to generate magnesium vapor, and the magnesium vapor is transported to the cooling space 7411 of the magnesium crystallization component 7400 through the magnesium vapor conduit. The cooling space 7411 is provided with a crystallization attachment 7440. After the magnesium vapor enters the cooling space 7411, it will gradually cool and crystallize on the crystallization attachment 7440. When the magnesium vapor crystallizes on the crystallization attachment 7440 to form enough magnesium crystals, the crystallization attachment 7440 can be taken out by opening the end cover 7450 on the cantilever end 7430 to collect these crystals. The design and arrangement of the crystallization attachment 7440 optimize the crystallization process of magnesium vapor and improve the crystallization efficiency and purity of magnesium.

[0090] As a preferred embodiment, the crystallization tank 7410 includes an inner tube 7412, an outer tube 7413, and a first end plate 74131 and a second end plate 74132 relatively connected to the two ends of the outer tube 7413, the first end plate 74131 and the second end plate 74132 are welded to the outer peripheral wall of the inner tube 7412, the outer tube 7413, the first end plate 74131 and the second end plate 74132 are jointly surrounded to form a circulating water cooling space 74133, the outer tube 7413 is provided with a water inlet pipe 7480 connected to the circulating water cooling space 74133, the inner cavity of the inner tube 7412 is the cooling space 7411, and the crystal attachment body 7440 is arranged in the inner tube 7412.

[0091] As a preferred embodiment, a vacuum tube connected to the cooling space 7411 is also included. The design of the vacuum tube can further control the pressure and atmosphere in the cooling space 7411. By adjusting the pressure in the vacuum tube, the crystallization rate and crystal morphology of magnesium vapor can be affected, thereby optimizing the crystallization effect. In addition, by evacuating the vacuum tube, the reduction temperature in the reduction chamber 7110 can also be reduced.

[0092] Reference Figure 1 In some embodiments of the present invention, a carbon dioxide collecting device 800 is further included, which is used to collect the carbon dioxide gas generated in the fluidized calcining mechanism 200 and the roasting mechanism 600, and transmit the collected carbon dioxide gas to the carbonization mechanism 400 as a carbonization gas source. Of course, excess carbon dioxide can also be made into dry ice.

[0093] The present invention also provides a comprehensive utilization device for magnesium-containing ore, including a preparation system for metallic magnesium. The comprehensive utilization device can obtain magnesium-aluminum spinel, calcium carbonate and other related products during the magnesium production process, and can process and store the related products. Of course, the generated carbon dioxide gas can also be comprehensively utilized to prepare dry ice.

[0094] A comprehensive utilization process of magnesium-containing ore, comprising the following steps: grinding, grinding the magnesium-containing ore to obtain a powdered material; fluidized calcination, fluidized calcination of the powdered material; digestion, digestion of the calcined material to obtain a digestion liquid; carbonization, carbonization of the digestion liquid to obtain a carbonization reaction liquid; intermediate treatment, treatment of the carbonization reaction liquid to obtain magnesium carbonate; roasting, roasting the magnesium carbonate solid to obtain magnesium oxide; reduction, reduction of the magnesium oxide to obtain metallic magnesium.

[0095] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A system for preparing magnesium metal, characterized in that: include: A grinding mechanism (100) is used to grind magnesium-containing ore to obtain a powdered material; A fluidized calcining mechanism (200) is used to fluidize and calcine powdered materials; A digestion mechanism (300) is used to digest the calcined material to obtain a digestion liquid; A carbonization mechanism (400) for carbonizing the digestion liquid to obtain a carbonized reaction liquid; An intermediate processing mechanism (500) is used to process the carbonization reaction liquid to obtain magnesium carbonate; A roasting mechanism (600) for roasting magnesium carbonate solid to obtain magnesium oxide; The reduction furnace (700) is used to perform a reduction treatment on magnesium oxide to obtain metallic magnesium.

2. The system for preparing metallic magnesium according to claim 1, characterized in that: The grinding mechanism (100) comprises: Milling machine frame (1100); The cylinder (1200) is rotatably mounted on the grinding machine frame (1100), and is provided with a grinding chamber (1210) therein, a feed end cover (1220) is provided at one end, and a discharge end cover (1230) is provided at the other end, the feed end cover (1220) is provided with a feed port (1221), the discharge end cover (1230) is provided with a first discharge port (1231), and an abrasive liner (1240) is provided on the peripheral wall of the grinding chamber (1210); The grinding head main shaft (1300) extends into the grinding chamber (1210), and a grinding roller (1310) is installed at one end of the grinding chamber (1210). The grinding roller (1310) cooperates with the abrasive liner (1240) to grind the material; A powder selection wheel (1400) is rotatably installed in the powder grinding chamber (1210) and covers the first discharge port (1231), and is provided with impellers (1410) arranged around it; A first driving mechanism (1500), used for driving the cylinder (1200) to rotate; The second driving mechanism (1600) is used to drive the grinding roller (1310) to rotate.

3. The system for preparing metallic magnesium according to claim 2, characterized in that: The invention also comprises an axle frame (1700) and a movable frame (1800), wherein the movable frame (1800) is slidably mounted on the grinding machine frame (1100) so that the grinding head spindle (1300) and the grinding roller (1310) can enter and exit the grinding chamber (1210) from the feed port (1221), and the grinding head spindle (1300) is mounted on the movable frame (1800); the movable frame (1800) is provided with a baffle (1810) that can fit with the outer side surface of the feed end cover (1220), and the baffle (1810) is provided with an avoidance hole (1810) for the grinding head spindle (1300) to pass through. 1); the grinding head spindle (1300) is installed on the shaft frame (1700), the shaft frame (1700) is connected to the moving frame (1800), and the second driving mechanism (1600) is installed on the shaft frame (1700); a swing arm (1820) is hinged on the moving frame (1800), and one end of the swing arm (1820) is hinged to the shaft frame (1700); the inner ring of the abrasive liner (1240) is provided with an inwardly sunken arc groove (1241), and the outer ring of the grinding roller (1310) is provided with an arc protrusion (1311) adapted to the arc groove (1241).

4. The system for preparing magnesium metal according to claim 1, characterized in that: The fluidized calcining mechanism (200) comprises: The roasting furnace (2100) is provided with a hot air inlet pipe (2110) and a material inlet pipe (2120) at the bottom, and the hot air inlet pipe (2110) is lower than the material inlet pipe (2120); A first cyclone separator (2200), the inlet of which is connected to the upper end of the roasting furnace (2100), the upper end of which is provided with a first air outlet (2210), and the lower end of which is provided with a first solid outlet (2220); A high temperature retention bin (2300) is used to receive the material output from the first solid outlet (2220) and keep the material warm; A preheating mechanism (2400) is connected to the first air outlet (2210) and has a first material output pipe (24021) connected to the material inlet pipe (2120); A raw material bin (2500) is used to transport materials to the preheating mechanism (2400); The cooling mechanism (2600) is used to receive the material output from the high-temperature retention bin (2300) and cool the material. The cooling mechanism (2600) is provided with a first hot air outlet (2610). The first hot air outlet (2610) is connected to the bottom of the roasting furnace (2100) to transport the hot air generated by exchanging heat with the material to the roasting furnace (2100).

5. The system for preparing magnesium metal according to claim 1, characterized in that: The carbonization mechanism (400) comprises: A tank body (4100) having a carbonization chamber (4110) therein, a second discharge port (4111) being provided at the bottom of the carbonization chamber (4110), and a feed pipe (4120) communicating with the carbonization chamber (4110) being connected to the tank body (4100); A rotary drive mechanism (4200) is installed at the upper end of the tank body (4100) and has a rotary output shaft (4210). The rotary output shaft (4210) is connected to a stirring shaft (4220). A stirring blade (4230) is installed on the stirring shaft (4220); A shearing blade disc (4300) is fixedly mounted on the stirring shaft (4220), and a shearing blade (4320) is provided on the outer peripheral side. The shearing blade (4320) and the shearing blade disc (4300) have an angle, so that the shearing blade (4320) has a force to push the medium to flow downward when rotating with the stirring shaft (4220); The air distribution pipe assembly (4400) is installed at the bottom of the carbonization chamber (4110), the air distribution pipe assembly (4400) has an air distribution hole (4410), and the air distribution pipe assembly (4400) is connected to an air inlet pipe (4420) extending out of the carbonization chamber (4110).

6. The system for preparing metallic magnesium according to claim 1, characterized in that: The digestion mechanism (300) includes a box body (3100), a driving assembly (3200) and a stirring assembly, wherein a first through hole matching the stirring assembly is provided at the top of the box body (3100), a feeding hole is provided at the top of the box body (3100), and a discharge hole (3120) is provided at the side wall of the box body (3100); the stirring assembly includes a stirring part (3300), and the driving assembly (3200) drives the stirring assembly to rotate so as to stir the material in the box body (3100).

7. The system for preparing magnesium metal according to claim 1, characterized in that: The reduction furnace (700) comprises a reduction furnace body (7100), a furnace cover assembly (7200), an electric heating assembly (7300) and a magnesium crystallization assembly (7400), wherein the reduction furnace body (7100) is formed with a reduction chamber, the reduction furnace body (7100) is provided with a slag discharge channel connected to the reduction chamber, the furnace cover assembly (7200) is connected to the reduction furnace body, and the furnace cover assembly (7200) is provided with a feed channel connected to the reduction chamber; the electric heating assembly (7300) is used to heat the material located in the reduction chamber and generate magnesium vapor, and the magnesium crystallization assembly (7400) is connected to the reduction chamber through a magnesium vapor conduit to crystallize the magnesium vapor from the reduction chamber.

8. The system for preparing magnesium metal according to claim 1, characterized in that: The invention also comprises a carbon dioxide collecting device (800) for collecting carbon dioxide gas generated in the fluidized calcining mechanism (200) and the roasting mechanism (600), and delivering the collected carbon dioxide gas to the carbonization mechanism (400).

9. A comprehensive utilization device for magnesium-containing ore, characterized in that: A system for preparing metallic magnesium comprising the method described in any one of claims 1 to 8.

10. A comprehensive utilization process of magnesium-containing ore, characterized in that: The steps include: Grinding, grinding the magnesium-containing ore to obtain a powdery material; Fluidized calcination, fluidizing and calcining the powdered material; Digestion, digesting the calcined material to obtain a digestion solution; Carbonization, carbonizing the digestion liquid to obtain a carbonized reaction liquid; Intermediate treatment, treating the carbonization reaction liquid to obtain magnesium carbonate; Calcination: calcining the magnesium carbonate solid to obtain magnesium oxide; Reduction: magnesium oxide is subjected to reduction treatment to obtain metallic magnesium.

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