Calcium-removed magnesium-rich recrystallized dolomite preparation device

Abstract

The utility model discloses a decalcified magnesium-rich recrystallized dolomite preparation device which comprises a reaction container, a decalcified magnesium-rich recrystallized dolomite and a decalcified magnesium-rich recrystallized dolomite preparation device, the first injection container and the second injection container are both connected to the reaction container, the first injection container contains a first reaction solution, the second injection container contains a second reaction solution, and the first reaction solution and the second reaction solution are supplied into the reaction container through a peristaltic pump and react with the basic reaction solution to generate a dolomite sample with a high magnesium-calcium ratio; the first gas cylinder, the second gas cylinder and the third gas cylinder can independently provide gas required by reaction into the reaction container; wherein the first gas cylinder is a cleaning bottle and is used for cleaning air supplied into the reaction container; the second gas cylinder is an N2 gas cylinder, and pure N2 gas with certain pressure is filled in the second gas cylinder; and the third gas cylinder is a CO2 gas cylinder, and pure CO2 gas with certain pressure is filled in the third gas cylinder. According to the utility model, dolomite is prepared in a calcium-removing magnesium-rich recrystallization mode under the normal-temperature and normal-pressure laboratory condition.

Description

TECHNICAL FIELD

[0001] The utility model belongs to dolomite preparation technical field, and concretely relates to a kind of preparation device of calcium-removing magnesium-rich recrystallized dolomite. BACKGROUND

[0002] Under normal temperature and pressure laboratory conditions, it is difficult to synthesize stoichiometric proto-dolomite, but under specific conditions such as microbial mediation and negative charged substance catalysis, proto-dolomite can be precipitated in brine with high Mg:Ca ratio. In modern sediments and ancient sedimentary strata, there are also microbial and inorganic dolomite deposits. However, the purity of proto-dolomite formed by initial precipitation is not high, and the order degree is low, which belongs to calcium-magnesium carbonate mixture. It needs to go through repeated dissolution-precipitation cycles to be converted into stoichiometric and highly ordered dolomite.

[0003] Under normal temperature and pressure laboratory conditions, it is relatively easy to precipitate non-stoichiometric magnesium-rich carbonates. In modern natural environment and ancient sedimentary strata, magnesium-rich carbonates such as high-magnesium calcite are widely distributed, but they have not been widely concerned because their characteristics are not obvious, and they have not been linked to dolomitization. Latest research shows that dolomite is difficult to grow under natural environmental conditions, even in highly supersaturated solutions. The reason is not the strong dehydration kinetics barrier of hydrated Mg2+ ions, but the high strain energy of 15 kJ / mol generated by atomic mismatch between the surface growth layer and the disordered substrate below when growing dolomite layer on the disordered surface of the initial precipitated dolomite. This high stress energy inhibits the further growth of the crystal. Weakly acidic unsaturated solutions with low pH value preferentially dissolve these disordered areas, and then increase the order during re-precipitation.

[0004] The inventors found that the dissolution-reprecipitation cycle of magnesium-rich carbonates caused by frequent fluctuations of solution pH value around the saturation degree of calcium-magnesium carbonate (CaMg(CO3)2-CaCO3) is a key factor for the precipitation of dolomite in laboratory and natural environment. This process not only occurs in the synsedimentary stage of magnesium-rich carbonates, but also can occur after diagenesis. When the solution pH value decreases, CaCO3 preferentially dissolves (calcium-removing), and MgCO3 with strong dissolution resistance is enriched in the sediment (magnesium-rich). Through the process of "dissolution-precipitation-calcium-removing-magnesium-rich-recrystallization", dolomite is formed, which does not need additional magnesium. However, there is no device in the prior art that can prepare dolomite by calcium-removing magnesium-rich recrystallization under normal temperature and pressure laboratory conditions, which affects the in-depth study of the genesis of dolomitization. UTILITY MODEL CONTENT

[0005] In view of the above analysis, the embodiment of the utility model aims at providing a kind of preparation device of calcium-removing magnesium-enriching recrystallized dolomite, realize in normal temperature and pressure laboratory conditions, with calcium-removing magnesium-enriching recrystallization mode preparation dolomite.

[0006] The utility model discloses a kind of preparation device of calcium-removing magnesium-enriching recrystallized dolomite, including:

[0007] A kind of preparation device of calcium-removing magnesium-enriching recrystallized dolomite, including:

[0008] Reaction vessel, as the reaction place of preparation dolomite, reaction vessel is pre-filled with basic reaction solution in it;

[0009] Injection container one and injection container two, two are connected to reaction vessel by one liquid supply line respectively, reaction liquid one is filled in injection container one, reaction liquid two is filled in injection container two, peristaltic pump is provided on liquid supply line, reaction liquid one and reaction liquid two are supplied into reaction vessel by peristaltic pump, and basic reaction solution occurs reaction to generate high magnesium-calcium ratio dolomite sample;

[0010] First gas cylinder, second gas cylinder and third gas cylinder, three gas cylinders are connected reaction vessel by gas supply line, and can independently provide reaction required gas in reaction vessel;Wherein, first gas cylinder is cleaning bottle, and is communicated with atmosphere, NaCl solution is pre-filled in cleaning bottle, for cleaning air supplied into reaction vessel;Second gas cylinder is N2 gas cylinder, and is filled with certain pressure pure N2 gas;Third gas cylinder is CO2 gas cylinder, and is filled with certain pressure pure CO2 gas.

[0011] Further, gas supply line includes three branch gas paths and one main gas path, first gas cylinder, second gas cylinder and third gas cylinder are connected with one branch gas path respectively, three branch gas paths are connected on main gas path, and main gas path is connected on reaction vessel.

[0012] Further, valve is provided on each branch gas path, and main valve is provided on main gas path.

[0013] Further, acidity meter is arranged in reaction vessel.

[0014] Further, stirrer is arranged in reaction vessel, and the stirrer is configured to stir the solution in the reaction vessel.

[0015] Further, the preparation device of calcium-removing magnesium-enriching recrystallized dolomite further includes a gas distribution mechanism, which has a disc and a gas pipe.

[0016] Further, the disc is rotatably arranged in the reaction vessel.

[0017] Furthermore, a sampling channel is provided on the side wall of the reaction vessel. The sampling channel is located above the disc and below the liquid level inside the reaction vessel, and a sampling valve is provided on the sampling channel.

[0018] Furthermore, the branch gas lines are equipped with flow meters and electric valves, which can automatically switch the gas combination or individual gas supply in the first, second, and third gas cylinders at regular intervals.

[0019] Furthermore, the first gas cylinder is equipped with a vacuum assembly, which includes an inlet pipe and an air pump mounted on the inlet pipe. The inlet end of the inlet pipe is in the air, and the outlet end of the inlet pipe is inserted below the surface of the NaCl solution in the first gas cylinder.

[0020] Compared with existing technologies, the dolomite preparation device provided by this invention, which involves decalcification and magnesium enrichment recrystallization, enables the preparation of dolomite under normal temperature and pressure laboratory conditions. This has positive significance for in-depth research on the genesis of dolomitization.

[0021] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages will become apparent from the description or be learned by practicing the invention. The objectives and other advantages of this invention can be realized and obtained from the description and accompanying drawings, which are particularly pointed out. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this specification 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 recorded in the embodiments of this specification. For those skilled in the art, other drawings can be obtained based on these drawings.

[0023] Fig. 1 A schematic diagram of the structure of the apparatus for preparing calcium-decalcified magnesium-enriched recrystallized dolomite provided by this utility model;

[0024] Fig. 2 A partial structural schematic diagram of a device for preparing calcium-decalcified magnesium-rich recrystallized dolomite provided by this utility model;

[0025] Fig. 3 A schematic diagram of another apparatus for preparing decalcified and magnesium-enriched recrystallized dolomite provided by this utility model.

[0026] Figure label:

[0027] 10. Reaction vessel;

[0028] 21. Injection Container 1; 22. Injection Container 2; 23. Liquid Supply Line; 24. Peristaltic Pump;

[0029] 31. First gas cylinder; 32. Second gas cylinder; 33. Third gas cylinder; 34. Branch gas line; 35. Main gas line;

[0030] 40. Sampling channel;

[0031] 51. Disc; 511. Vent hole; 52. Air pipe; 53. Rotary joint; 54. Driven gear;

[0032] 61. Electric motor; 62. Drive gear. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] To facilitate understanding of the embodiments of this application, further explanation and description will be provided below with reference to the accompanying drawings and specific embodiments. These embodiments do not constitute a limitation on the embodiments of this application. In the drawings, the dimensions and relative dimensions of components may be exaggerated for clarity and / or descriptive purposes. When exemplary embodiments can be implemented differently, a specific process sequence may be performed in a different order than that described. For example, two consecutively described processes may be performed substantially simultaneously or in the reverse order of their description. Furthermore, the same reference numerals denote the same components.

[0035] The terminology used herein is for the purpose of describing particular embodiments and is not intended to be limiting. As used herein, unless the context clearly indicates otherwise, the singular forms “a” and “the” are intended to include the plural forms as well. Furthermore, when the terms “comprising” and / or “including” and variations thereof are used in this specification, it indicates the presence of the stated features, integrals, steps, operations, parts, components, and / or groups thereof, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, parts, components, and / or groups thereof. It should also be noted that, as used herein, the terms “substantially,” “about,” and other similar terms are used as approximate terms rather than as terms of degree, thus explaining the inherent biases in measurements, calculated values, and / or provided values ​​that would be recognized by one of ordinary skill in the art.

[0036] Example 1

[0037] A specific embodiment of this utility model is as follows: Figs. 1-2 As shown, an apparatus for preparing calcium-decalcified magnesium-rich recrystallized dolomite is disclosed, comprising:

[0038] The reaction vessel 10 serves as the reaction site for preparing dolomite, and the reaction vessel 10 is pre-filled with a basic reaction solution.

[0039] Injection container 1 (21) and injection container 2 (22) are each connected to reaction container 10 via a liquid supply line (23). The liquid supply line (23) is a silicone tube with an inner diameter of 0.38 mm. Injection container 1 (21) contains reaction solution 1, and injection container 2 (22) contains reaction solution 2. A peristaltic pump (24) is installed on the liquid supply line (23) to supply reaction solution 1 and reaction solution 2 into reaction container 10, where they react with the basic reaction solution to generate a dolomite sample with a high magnesium-to-calcium ratio. Switches are installed at the outlets of injection containers 1 (21) and 2 (22).

[0040] The first gas cylinder 31, the second gas cylinder 32, and the third gas cylinder 33 are connected to the reaction vessel via gas supply pipelines and can independently supply the gas required for the reaction into the reaction vessel. Among them, the first gas cylinder 31 is a cleaning bottle, which is open to the atmosphere and is pre-filled with NaCl solution to clean the air supplied to the reaction vessel; the second gas cylinder 32 is an N2 gas cylinder, which contains pure N2 gas at a certain pressure; and the third gas cylinder 33 is a CO2 gas cylinder, which contains pure CO2 gas at a certain pressure.

[0041] In this embodiment, the basic reaction solution is a 0.45M NaCl solution; the Ca in reaction solution one... 2+ Mg 2+ Na + The ion concentration is equal to that of Ca in standard seawater. 2+ Mg 2+ Na + Ion concentration value; CO3 in reaction solution two 2- Ion concentration and Ca in reaction solution one 2+ With consistent ion concentrations, the Na in reaction solution two... + Ion concentration and Na in reaction solution one + The ion concentrations are consistent.

[0042] In one optional embodiment, the gas supply pipeline includes three branch gas lines 34 and one main gas line 35. The first gas cylinder 31, the second gas cylinder 32, and the third gas cylinder 33 are each connected to a branch gas line 34. The three branch gas lines 34 connect to the main gas line 35, which in turn connects to the reaction vessel. Furthermore, a valve is installed on each branch gas line 34, and a main valve can also be installed on the main gas line 35. The valves on the branch gas lines 34 allow the three gas cylinders to independently supply different gas components to the reaction vessel, or two or all three can supply different gas components simultaneously, depending on the specific needs.

[0043] Within reaction vessel 10, multiple solutions are mixed, and various gases are used to adjust the pH of the mixed solution, initiating a dissolution-reprecipitation cycle of magnesium-rich carbonates to achieve calcium removal and magnesium enrichment recrystallization to prepare dolomite. When cleaned air is continuously introduced through the first gas cylinder, the pH in reaction vessel 10 can be stabilized at 8.1-8.4, causing carbonate mineral precipitation. When switching to pure CO2 gas or a mixture of CO2 and N2 gas, the pH decreases, CaCO3 preferentially dissolves to remove calcium, and MgCO3 enriches magnesium, initiating the calcium removal and magnesium enrichment recrystallization process.

[0044] Preferably, the reaction vessel 10 is equipped with a pH meter to monitor the pH changes of the mixed solution in the reaction vessel 10 in real time.

[0045] In one alternative embodiment, a stirrer is provided inside the reaction vessel 10 to stir the solution within the reaction vessel 10. For example, the stirrer includes a rotor and a drive unit that drives the rotor to rotate. The drive unit is outside the reaction vessel 10, while the rotor is inside the reaction vessel 10. The drive unit drives the rotor to rotate, thereby achieving solution stirring. An electromagnetic drive principle is used between the drive unit and the rotor to make the rotor rotate in the solution, thus achieving solution stirring. This can be achieved using a magnetically driven stirrer from the prior art.

[0046] In one optional embodiment, the reaction vessel 10 is provided with a gas distribution mechanism, which includes a disc 51 and a gas pipe 52. The disc 51 is horizontally arranged inside the reaction vessel 10, near the lower middle part. The interior of the disc 51 has a gas storage cavity. The gas pipe 52 is disposed through the bottom wall of the reaction vessel 10, and the gas storage cavity is connected to the main gas passage 35 through the gas pipe 52. The top and / or bottom surface of the disc 51 is evenly distributed with multiple vent holes 511, which are connected to the gas storage cavity. By providing multiple dispersed vent holes 511 on the disc 51, the gas can enter the reaction mixture solution more evenly, increasing the contact area and contact opportunities between the gas and the solution.

[0047] Specifically, the first gas cylinder 31, the second gas cylinder 32, and the third gas cylinder 33 are each connected to the main gas path 35 through a branch gas path 34. The main gas path 35 is connected to the lower end of the gas pipe 52, and the upper end of the gas pipe 52 is connected to the center of the bottom surface of the disc 51 and is connected to the gas storage cavity. This enables the three gas cylinders to supply gas to the disc 51 of the gas distribution mechanism. The supplied gas enters the reaction mixture solution through the vent holes 511 distributed on the disc 51, increasing the contact area and contact opportunities between the gas and the solution.

[0048] Since the first gas cylinder is a cleaning cylinder, it needs to be cleaned by outside air before being supplied to the reaction vessel. Therefore, a vacuum assembly is required for the first gas cylinder. This assembly includes an inlet pipe and an air pump mounted on the inlet pipe. The inlet end of the inlet pipe is in the air, while the outlet end is submerged below the surface of the NaCl solution in the first gas cylinder. The air pump supplies air into the NaCl solution, bubbling and cleaning it before it enters the reaction vessel. The second gas cylinder is an N2 cylinder, and the third gas cylinder is a CO2 cylinder. These two cylinders already possess a certain pressure, so no additional air pumps are needed; the internal pressure of the cylinders is sufficient to power the gas supply.

[0049] In one alternative embodiment, a sampling channel 40 is also provided on the side wall of the reaction vessel 10. The sampling channel 40 is located above the disc 51 and below the liquid surface in the reaction vessel 10. A sampling valve is provided on the sampling channel 40, and liquid samples are taken from the reaction vessel 10 through the sampling channel 40 and the sampling valve. When it is necessary to collect a sample, the sampling valve is opened to obtain a liquid sample from the reaction vessel 10. Stirring of the solution in the reaction vessel 10 is stopped 30 minutes before sampling to allow particulate matter in the solution to settle, facilitating the extraction of solution samples.

[0050] The reaction preparation process is as follows: Prepare reaction solution one, reaction solution two, and a basic reaction solution, and add magnesium-rich carbonate rock seeds to the basic reaction solution in the reactor; use a peristaltic pump to inject reaction solution one and reaction solution two into the reaction vessel, where they react with the basic reaction solution containing the magnesium-rich carbonate rock seeds; during the reaction, the pH value of the solution in the reaction vessel is adjusted by controlling the supply of gas sources with different compositions from three gas cylinders, continuously alternating between lowering and raising the pH value day and night, with an alternation interval of 12 hours, and obtaining a dolomite sample with a high magnesium-to-calcium ratio after 30-60 days. During the reaction, reaction solution one and reaction solution two are injected into the reaction vessel at a rate of 7 μL / min using a peristaltic pump, with a daily flow of 10 ml; the gas supply pressure of the three gas cylinders is 1-1.2 bar, such as 1.1 bar. In the initial stage of the reaction, air cleaned with NaCl solution was continuously supplied to the reaction vessel for 5 consecutive days to stabilize the pH value of the solution at 8.1-8.4. Then, starting from the 6th day, pure CO2 gas or a mixture of CO2 and N2 gas was continuously supplied during the day to maintain the pH value of the solution at 6-6.3. When the pH value of the solution drops to 6-6.3, the precipitated CaCO3 preferentially dissolves (decalcification), allowing the more resistant MgCO3 to accumulate in the sediment (magnesium enrichment), initiating the "decalcification and magnesium enrichment recrystallization" process without the need for additional external magnesium. At night, pure N2 gas was continuously supplied to raise the pH value and maintain it at 7.5-7.8, allowing the more resistant MgCO3 to continue to accumulate in the sediment, and causing carbonate minerals to precipitate and recrystallize.

[0051] The reaction mechanism of decalcified and magnesium-rich recrystallized dolomite is as follows: through cyclical changes in pH value, decreasing and increasing, magnesium-rich carbonates continuously undergo "decalcification and magnesium-rich recrystallization," ultimately forming dolomite with a high Mg / Ca ratio. Experimental methods involving frequent pH fluctuations and multiple cycles of carbonate dissolution and reprecipitation can improve the orderliness of the precipitated dolomite. In the mixed growth region of calcium-magnesium carbonates, calcium-rich domains, hydrated carbonate domains, and disordered domains preferentially dissolve; once stronger Mg-CO3 bonds form in the structure, they resist dissociation during dissolution, leading to magnesium enrichment in the carbonate. Under weakly acidic conditions, the preferential dissolution order of carbonate minerals is: aragonite → calcite → disordered dolomite → magnesite → ordered dolomite. High mol% MgCO3 carbonate precursors are required, and non-equilibrium local dissolution is precisely the process of preferentially removing low-magnesium minerals. Weakly acidic unsaturated solutions with lower pH values ​​preferentially dissolve these disordered regions, thereby increasing orderliness during reprecipitation.

[0052] Compared with existing technologies, the dolomite preparation device provided in this embodiment has a simple structure and is easy to operate. It realizes the preparation of dolomite by decalcification and magnesium enrichment under normal temperature and pressure laboratory conditions, which is of positive significance for in-depth research on the genesis of dolomitization.

[0053] Example 2

[0054] Another specific embodiment of this utility model is as follows: Fig. 3 As shown, a device for preparing decalcified and magnesium-enriched recrystallized dolomite is disclosed. The difference from Example 1 is that the disc 51 of the gas distribution mechanism is rotatably disposed within the reaction vessel 10. During the reaction, rotating the disc 51 ensures more uniform contact between the gas supplied through the vent 511 and the solution, avoiding localized gas aggregation or uneven distribution. This improves the uniformity of the reaction, allowing it to proceed more evenly throughout the entire reaction vessel 10, reducing localized reaction differences caused by uneven gas distribution. This enhances the efficiency and quality of the dolomite preparation reaction, resulting in more stable and reliable experimental results and providing better reaction conditions for dolomite preparation.

[0055] In one alternative embodiment, the trachet 52 is fixedly connected to the disc 51, and both can rotate simultaneously, with the axis of the trachet 52 coinciding with the axis of the disc 51. For example, the outlet end of the trachet 52 is fixedly connected to the center of the bottom wall of the disc 51, communicating with the gas storage cavity within the disc 51. The trachet 52 passes through the center of the bottom wall of the reaction vessel 10, and the inlet of the trachet 52 is connected to the main gas path 35. A rotary sealing structure is provided at the connection between the bottom wall of the reaction vessel 10 and the trachet 52. This rotary sealing structure can seal the connection between the outer wall of the trachet 52 and the bottom wall of the reaction vessel 10, while also ensuring the rotation of the trachet 52. The air inlet of the trachea 52 is connected to the main air passage 35 through a rotary joint 53. The rotary joint 53 is mounted on a support base, which supports the trachea 52. The rotary joint 53 can connect the main air passage 35 and the air inlet of the trachea 52, and can ensure the rotation of the trachea 52. The trachea 52 can rotate through the rotary joint 53 and the rotary sealing structure, thereby driving the disc 51 to rotate.

[0056] In the technical solution where the turntable can rotate, the gas pipe 52 can be manually rotated outside the reaction vessel 10 to achieve the rotation of the disc 51; alternatively, an electric drive mechanism can be used outside the reaction vessel 10 to drive the gas pipe 52 to rotate, thereby achieving the rotation of the disc 51. Optionally, in the technical solution using an electric drive mechanism, the gas distribution mechanism also includes an electric drive mechanism configured to drive the gas pipe 52 to rotate, thereby driving the disc 51 to rotate. Specifically, the electric drive mechanism includes a motor 61 and a drive gear 62 mounted on the motor output shaft. The motor 61 is mounted on a motor base (not shown in the figure), and the drive gear 62 meshes with a driven gear 54 fixedly mounted outside the gas pipe 52. The motor drives the gas pipe 52 to rotate through the drive gear 62 and the driven gear 54, thereby driving the disc 51 to rotate.

[0057] Example 3

[0058] Another specific embodiment of this utility model discloses a preparation apparatus for decalcified and magnesium-enriched recrystallized dolomite. The difference from Embodiment 1 is that a gas flow control valve is provided at the outlet of the gas pipe 52, and the amount of gas entering the disk 51 is controlled by the gas flow control valve. A gas flow control valve in the prior art can be used.

[0059] Because the supplied gas is under pressure, liquid will not backflow through the vent during normal gas supply. To further prevent liquid backflow, a one-way vent valve can be installed on the vent of the disc 51. Alternatively, a gas flow control valve installed at the outlet of the gas pipe 52 can also prevent liquid backflow.

[0060] Example 4

[0061] Another specific embodiment of this utility model discloses a preparation device for decalcified and magnesium-enriched recrystallized dolomite. The difference from Embodiment 1 is that a flow meter and an electric valve are installed on the branch gas path 34, which can automatically switch the gas combination or individual gas supply in the first gas cylinder 31, the second gas cylinder 32, and the third gas cylinder 33 at set times. The flow meter in the branch gas path 34 monitors the gas flow rate in real time, and the electric valve switches the gas supply combination or individual gas supply at set times (e.g., 12 hours). For example, during the day, it automatically switches to supplying only pure CO2 gas or a mixture of CO2 and N2 gas simultaneously to lower the pH value of the solution in the reaction vessel 10 and initiate the decalcified and magnesium-enriched recrystallization process; at night, it automatically switches to supplying pure N2 gas to raise the pH value and promote the precipitation and recrystallization of carbonate minerals.

[0062] In one alternative embodiment, a controller is also included. The controller is connected to the pH meter, flow meter, and electric valve via signal control. That is, the pH value measured by the pH meter and the gas volume value measured by the flow meter can be transmitted to the controller in real time. The controller can control the type, composition, and duration of the gas supplied according to a preset program, thereby realizing feedback regulation of the solution pH value and keeping the pH within the set range during the reaction process (differentiated pH ranges for day and night) to avoid the pH from becoming too low or too high.

[0063] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this application. It should be understood that the above description is only a specific embodiment of this application and is not intended to limit the scope of protection of this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. An apparatus for preparing calcium- and magnesium-rich recrystallized dolomite, characterized in that, include: The reaction vessel, which serves as the reaction site for the preparation of dolomite, is pre-filled with the basic reaction solution. Injection container one and injection container two are each connected to the reaction container via a liquid supply line. Injection container one contains reaction liquid one, and injection container two contains reaction liquid two. A peristaltic pump is installed on the liquid supply line to supply reaction liquid one and reaction liquid two into the reaction container, where they react with the basic reaction solution to generate a dolomite sample with a high magnesium-to-calcium ratio. The first, second, and third gas cylinders are connected to the reaction vessel via gas supply lines and can independently supply the gas required for the reaction into the reaction vessel. Among them, the first gas cylinder is a cleaning bottle, which is open to the atmosphere and is pre-filled with NaCl solution to clean the air supplied to the reaction vessel; the second gas cylinder is an N2 gas cylinder; and the third gas cylinder is a CO2 gas cylinder.

2. The apparatus for preparing decalcified and magnesium-enriched recrystallized dolomite according to claim 1, characterized in that, The gas supply pipeline includes three branch gas lines and one main gas line. The first gas cylinder, the second gas cylinder, and the third gas cylinder are each connected to a branch gas line. The three branch gas lines are connected to the main gas line, and the main gas line is connected to the reaction vessel.

3. The apparatus for preparing decalcified and magnesium-rich recrystallized dolomite according to claim 1, characterized in that, A valve is installed on each branch gas line, and a main valve is installed on the main gas line.

4. The apparatus for preparing decalcified and magnesium-enriched recrystallized dolomite according to claim 1, characterized in that, The reaction vessel is equipped with a pH meter.

5. The apparatus for preparing decalcified and magnesium-enriched recrystallized dolomite according to claim 1, characterized in that, The reaction vessel is equipped with a stirrer, which is configured to stir the solution inside the reaction vessel.

6. The apparatus for preparing decalcified and magnesium-enriched recrystallized dolomite according to claim 1, characterized in that, It also includes a gas distribution mechanism, which has a disc and a gas pipe. The disc is horizontally arranged inside the reaction vessel and has a gas storage cavity inside. The gas pipe is set through the bottom wall of the reaction vessel and the gas storage cavity is connected to the main gas path through the gas pipe. Multiple vent holes are evenly distributed on the top and / or bottom surfaces of the disc and are connected to the gas storage cavity.

7. The apparatus for preparing decalcified and magnesium-rich recrystallized dolomite according to claim 6, characterized in that, The disc is rotatably mounted inside the reaction vessel.

8. The apparatus for preparing decalcified and magnesium-rich recrystallized dolomite according to claim 6 or 7, characterized in that, The side wall of the reaction vessel is equipped with a sampling channel, which is located above the disc and below the liquid level inside the reaction vessel. The sampling channel is equipped with a sampling valve.

9. The apparatus for preparing decalcified and magnesium-rich recrystallized dolomite according to claim 2, characterized in that, The branch gas lines are equipped with flow meters and electric valves, which can automatically switch the gas combination or individual gas supply in the first, second and third gas cylinders at regular intervals.

10. The apparatus for preparing decalcified and magnesium-rich recrystallized dolomite according to claim 1, characterized in that, The first gas cylinder is equipped with a vacuum assembly, which includes an air inlet pipe and an air pump mounted on the air inlet pipe. The air inlet end of the air inlet pipe is located in the air, and the air outlet end of the air inlet pipe is inserted below the liquid level of the NaCl solution in the first gas cylinder.

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