Carbonate mineral synthesis experiment device

Abstract

The invention relates to a carbonate mineral synthesis experiment device, and belongs to the technical field of carbonate crystallization. The carbonate mineral synthesis experiment device comprises a reaction module, an environment control module, a liquid adding module, a gas control module, a monitoring module and a controller. The reaction module is internally provided with a reaction cavity for accommodating a first reaction solution and dissolving organic matters, the environment control module is used for providing heat into the reaction cavity to maintain the reaction temperature, and the liquid adding module is used for supplementing a second reaction solution and a third reaction solution into the reaction cavity; the gas control module is used for providing reaction gas into the reaction cavity so as to maintain the pressure intensity in the reaction cavity at a first threshold value, the monitoring module is used for monitoring reaction parameters in the reaction cavity, and the controller is electrically connected with the reaction module, the environment control module and the liquid adding module.

Description

Technical Field

[0001] The present invention belongs to the technical field of carbonate crystallization, and particularly relates to an experimental device for synthesizing carbonate minerals. Background Art

[0002] Carbonate rocks are mainly composed of carbonate minerals such as calcite and dolomite. They are widely exposed rock formations in the strata and are also important materials for studying the evolution of the surface environment during the geological history period. During the formation process of carbonate minerals, various chemical substances such as ions and molecules in the environmental water will combine with mineral crystals according to certain geochemical laws. Considering that calcium carbonate is the most common component in carbonate minerals, laboratories generally establish the corresponding relationship between certain ions / molecules and isotope characteristics in carbonate minerals and environmental water chemical information, that is, carbonate geochemical indicators, through calcium carbonate synthesis experiments under known parameters. As a class of substances widely distributed in natural waters with extremely diverse compositions and concentrations, dissolved organic matter has an obvious effect on both the nucleation and crystallization processes of carbonate minerals. It can not only change the saturation index required for carbonate mineral crystallization but also affect the geochemical behavior of ions / molecules and isotopes in water in carbonate minerals. However, the existing carbonate geochemical indicators often ignore the role of this factor during the development process, which makes it very likely that there are obvious defects when these related geochemical indicators are applied to actual geological samples. Therefore, there is an urgent need to establish a calcium carbonate synthesis experimental device involving dissolved organic matter to serve the development of related geochemical indicators. Summary of the Invention

[0003] In view of the above problems, the embodiments of the present application provide an experimental device for synthesizing carbonate minerals, which can be used for studying the influence of dissolved organic matter on the nucleation and crystallization processes of carbonate minerals.

[0004] The embodiments of the present application provide an experimental device for synthesizing carbonate minerals, including a reaction module, an environmental control module, a liquid addition module, a gas control module, a monitoring module, and a controller. The reaction module has a reaction chamber for accommodating a first reaction solution and dissolved organic matter. The environmental control module is used to provide heat to the reaction chamber to maintain the reaction temperature. The liquid addition module is used to supplement a second reaction solution and a third reaction solution to the reaction chamber. The gas control module is used to provide a reaction gas to the reaction chamber so that the pressure in the reaction chamber is maintained at a first threshold. The monitoring module is used to monitor the reaction parameters in the reaction chamber. The controller is electrically connected to the reaction module, the environmental control module, and the liquid addition module.

[0005] In the above technical solution, various physical and chemical parameters of the calcium carbonate synthesis solution, such as the air pressure, hydrogen ion concentration index, and temperature during the reaction, can be adjusted according to the experimental needs, so that these physical and chemical parameters can be basically kept stable during the crystallization process of calcium carbonate. Thereby reducing the influence of other parameters on the crystallization of calcium carbonate during the experiment, and then by switching different concentrations of dissolved organic matter, the influence of calcium carbonate synthesis with different concentrations of dissolved organic matter on the crystallization of calcium carbonate is studied.

[0006] In some embodiments, the reaction module includes a housing and a magnetic stirrer. The housing has the reaction chamber. The magnetic stirrer includes a main body part and a rotor part. The main body part has a bearing surface for bearing the housing. The rotor part is arranged in the reaction chamber. The main body part is configured to drive the rotor part to rotate by magnetic force.

[0007] In the above technical solution, the main body part is configured to drive the rotor part to rotate by magnetic force, so that when the liquid adding module replenishes the second reaction solution and the third reaction solution to the reaction chamber during the reaction, the first reaction solution, the second reaction solution, and the third reaction solution are stirred by the magnetic stirrer to ensure the uniformity of their composition, thereby increasing the accuracy of the experiment.

[0008] In some embodiments, the carbonate mineral synthesis experimental device further includes a storage rack. The storage rack includes a first storage platform and a second storage platform located above the first storage platform. The main body part is arranged on the first storage platform. The liquid adding module includes a dual-channel micro-injection pump and two first syringes. The dual-channel micro-injection pump is arranged on the second storage platform. The two first syringes are respectively used to accommodate the second reaction solution and the third reaction solution. The two first syringes are respectively communicated with the reaction chamber. The dual-channel micro-injection pump is used to drive the two first syringes to provide the second reaction solution and the third reaction solution to the reaction chamber.

[0009] In the above technical solution, the first storage platform and the second storage platform arrange the reaction module and the liquid adding module in the gravity direction, so that the reaction module and the liquid adding module can make full use of the space in the gravity direction in the environmental control module.

[0010] In some embodiments, the dual-channel micro-injection pump has a stop switch, the second placement platform has a hollowed-out area for accommodating the stop switch, and the placement rack further includes a connecting pipe, a slider, and a check valve. One end of the connecting pipe communicates with the hollowed-out area, the slider is slidably disposed within the connecting pipe, the slider partitions the connecting pipe, the other end of the connecting pipe communicates with the reaction chamber through the check valve, and the check valve is configured to allow the gas in the reaction chamber to enter the connecting pipe when the pressure in the reaction chamber is greater than a second threshold, so as to drive the slider to abut against the stop switch, and the second threshold is greater than the first threshold.

[0011] Specifically, when the dual-channel micro-injection pump drives the second reaction solution and the third reaction solution in the first syringe into the reaction chamber, the pressure in the reaction chamber will gradually increase to be greater than the first threshold and greater than the second threshold. As a result, the gas in the reaction chamber passes through the check valve and enters the connecting pipe, driving the slider to abut against the stop switch. Thus, by adjusting the set value of the second threshold, when the supplemented second reaction solution and third reaction solution are about to exceed the experimental requirements, the dual-channel micro-injection pump can be closed by the abutment of the slider against the stop switch, so that the supplemented second reaction solution and third reaction solution are within the experimental requirements, and the changes in the total volume, salinity, and dissolved organic matter concentration of the calcium carbonate synthesis solution during the calcium carbonate synthesis process can be negligible, thereby improving the reliability of the experiment.

[0012] In some embodiments, the gas control module includes a gas source and a pressure gauge. The gas source communicates with the reaction chamber and is used to supply reaction gas to the reaction chamber, and the pressure gauge is used to detect the pressure of the reaction gas provided by the gas source.

[0013] In the above technical solution, the pressure gauge is used to detect the pressure of the reaction gas provided by the gas source to make the dissolved carbon dioxide in the solution reach the chemical equilibrium state during the reaction process, thereby stabilizing the hydrogen ion concentration index, reducing the influence of other factors on the crystallization of calcium carbonate, and improving the reliability of the experiment.

[0014] In some embodiments, the gas control module further includes a safety valve, the safety valve communicates with the reaction chamber, and the safety valve is configured to allow the gas in the reaction chamber to be discharged through the safety valve when the pressure in the reaction chamber is greater than a third threshold, and the third threshold is greater than the second threshold.

[0015] In the above technical solution, the safety valve is configured to allow the gas in the reaction chamber to be discharged through the safety valve when the pressure in the reaction chamber is greater than the third threshold, and the third threshold is greater than the second threshold, so as to relieve the pressure of the reaction chamber when the pressure is too high and improve the safety of the experiment.

[0016] In some embodiments, the gas control module further includes a buffer member. The buffer member has a buffer chamber for containing a buffer solution, and has an air inlet below the liquid level of the buffer solution and an air outlet above the liquid level of the buffer solution. The air inlet is communicated with the gas source, and the air outlet is communicated with the reaction chamber.

[0017] In the above technical solution, the buffer member buffers the high-pressure reaction gas to reduce the loss caused to the calcium carbonate synthesis solution by the airflow effect.

[0018] In some embodiments, the environment control module includes a box body and a heating element. The reaction module, the liquid adding module and the monitoring module are accommodated in the box body. The heating element is arranged in the box body and is used to provide heat to the inside of the box body to provide heat to the reaction chamber.

[0019] In the above technical solution, the reaction module, the liquid adding module and the monitoring module are accommodated by the box body, so that the reaction chamber can react at a constant temperature. At the same time, the temperature difference between the supplemented second reaction solution and the third reaction solution and the solution in the reaction chamber is reduced, thereby reducing the inaccuracy of the experimental data caused by the temperature change of the solution in the reaction chamber due to the supplemented second reaction solution and the third reaction solution.

[0020] In some embodiments, the monitoring module includes a pH composite electrode and a temperature probe. The pH composite electrode is located in the reaction chamber and is used to detect the pH of the solution in the reaction chamber. The temperature probe is located in the reaction chamber and is used to detect the temperature of the solution in the reaction chamber.

[0021] In some embodiments, the monitoring module includes a sampler, and the sampler is communicated with the reaction chamber for extracting the solution in the reaction chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] Figure 1 It is a schematic structural diagram of the carbonate mineral synthesis experimental device provided by the embodiment of the present invention;

[0024] Figure 2 It is a cross-sectional view of the carbonate mineral synthesis experimental device provided by the embodiment of the present invention during the experiment;

[0025] Figure 3 A cross-sectional view of the carbonate mineral synthesis experimental device provided by the embodiment of the present invention during the sampling process;

[0026] Figure 4 is Figure 2 the cross-sectional view taken along A-A in;

[0027] Figure 5 A cross-sectional view taken along A-A when the slider of the carbonate mineral synthesis experimental device provided by the embodiment of the present invention abuts against the stop switch; Figure 2 in. Detailed implementation manners

[0028] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0029] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0030] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0031] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected" and "connected" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection, it may be a mechanical connection, it may be an electrical connection, it may be directly connected, or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0032] Carbonate rocks are mainly composed of carbonate minerals such as calcite and dolomite. They are widely exposed rock formations in the strata and are also important materials for studying the evolution of the surface environment during the geological history period. During the formation of carbonate minerals, various chemical substances such as ions and molecules in the environmental water will combine with mineral crystals according to certain geochemical laws. Considering that calcium carbonate is the most common component in carbonate minerals, laboratories generally establish the corresponding relationship between certain ions / molecules and isotope characteristics in carbonate minerals and environmental water chemical information, that is, carbonate geochemical indicators, through calcium carbonate synthesis experiments under known parameters. As a class of substances widely distributed in natural waters with extremely diverse compositions and concentrations, dissolved organic matter has an obvious effect on both the nucleation and crystallization processes of carbonate minerals. It can not only change the saturation index required for carbonate mineral crystallization but also affect the geochemical behavior of ions / molecules and isotopes in water in carbonate minerals. However, the existing carbonate geochemical indicators often ignore the role of this factor during the development process, which makes it very likely that there are obvious defects when these related geochemical indicators are applied to actual geological samples. Therefore, there is an urgent need to establish a calcium carbonate synthesis experimental device involving dissolved organic matter to serve the development of related geochemical indicators.

[0033] To solve the above technical problems, referring to Figures 1-5 , an embodiment of the present application provides a carbonate mineral synthesis experimental device 100, including a reaction module 10, an environmental control module 20, a liquid addition module 30, a gas control module 40, a monitoring module 50, and a controller. The reaction module 10 has a reaction chamber for accommodating a first reaction solution and dissolved organic matter. The environmental control module 20 is used to provide heat to the reaction chamber to maintain the reaction temperature. The liquid addition module 30 is used to supplement a second reaction solution and a third reaction solution to the reaction chamber. The gas control module 40 is used to provide a reaction gas to the reaction chamber so that the pressure in the reaction chamber is maintained at a first threshold. The monitoring module 50 is used to monitor the reaction parameters in the reaction chamber. The controller is electrically connected to the reaction module 10, the environmental control module 20, and the liquid addition module 30.

[0034] It should be noted that all modules and components are connected through pipelines.

[0035] The first reaction solution is a simulated natural water body prepared according to experimental needs. Taking simulated seawater as an example, the first reaction solution can contain Ca 2+ , Mg 2+ , K + , Cl - , CO3 2-ions such as etc. Dissolved Organic Matter is a complex organic mixture widely present in water bodies and soils. It has a relatively small molecular weight and can pass through a 0.45-micron filter membrane. The second reaction solution and the third reaction solution are calcium chloride reagent and sodium carbonate reagent respectively.

[0036] Specifically, during the experiment, a mixed solution of the first reaction solution and dissolved organic matter can be prepared according to the experimental needs and placed in the reaction chamber. Set the rotation speed of the magnetic stirrer 12 to stir the calcium carbonate synthesis solution according to the experimental requirements. Turn on the environmental control module 20 and set the temperature according to the experimental needs.

[0037] Adjust the gas control module 40 to release the reaction gas and control the pressure in the reaction chamber to the first threshold (the first threshold can be 200 kPa). Ventilate the reaction chamber for two hours to achieve the chemical equilibrium of the carbon dioxide system between the calcium carbonate synthesis solution and the introduced gas.

[0038] Put the calcium chloride reagent and sodium carbonate reagent into the liquid addition module 30 respectively to remove the bubbles in the liquid addition module 30. Make the liquid addition module 30 slowly and stably inject the calcium chloride reagent and sodium carbonate reagent into the reaction chamber, ensuring that the total injection volume of the two reagents is less than 4% of the volume of the calcium carbonate synthesis solution originally in the reaction chamber.

[0039] Measure the temperature and hydrogen ion concentration index of the solution in the reaction chamber through the monitoring module 50 and feedback them to the controller. The controller records the above data and adjusts the environmental control module 20 according to the above data to control the reaction temperature to be constant.

[0040] The experiment needs to set the time interval and the number of saves for the pH detector 51 to automatically store the test results of the temperature and hydrogen ion concentration index, and the pH detector 51 starts to work.

[0041] During the whole experiment process, the continuously supplemented calcium chloride reagent and sodium carbonate reagent through the liquid addition module 30 can make the calcium carbonate synthesis solution reach the calcium carbonate nucleation condition and continuously crystallize. The ventilation module can maintain the chemical equilibrium of the carbon dioxide system between the calcium carbonate synthesis solution and the introduced gas during calcium carbonate crystallization, thereby maintaining the stability of the hydrogen ion concentration index of the calcium carbonate synthesis solution. The monitoring module 50 can directly test the temperature and hydrogen ion concentration index of the calcium carbonate synthesis solution. After the experiment, collect the synthesis product in the reaction chamber through the sintered filter. This product is calcium carbonate synthesized under the participation of dissolved organic matter in the simulated natural environment.

[0042] In this technical solution, various physical and chemical parameters of the calcium carbonate synthesis solution, such as the air pressure, hydrogen ion concentration index, and temperature during the reaction, can be adjusted according to the experimental needs, so that these physical and chemical parameters can be basically kept stable during the crystallization process of calcium carbonate. Thus, the influence of other parameters on the crystallization of calcium carbonate during the experiment is reduced, and then by switching different concentrations of dissolved organic matter, the influence of different concentrations of dissolved organic matter on the crystallization of calcium carbonate during the synthesis of calcium carbonate is studied.

[0043] According to some embodiments of the present application, the reaction module 10 includes a housing 11 and a magnetic stirrer 12. A reaction chamber is provided inside the housing 11. The magnetic stirrer 12 includes a main body portion 121 and a rotor portion 122. The main body portion 121 has a bearing surface for bearing the housing 11, and the rotor portion 122 is arranged in the reaction chamber. The main body portion 121 is configured to drive the rotor portion 122 to rotate through magnetic force.

[0044] Exemplarily, the housing 11 can be a five-neck round-bottom flask, which has five openings communicating with the reaction chamber inside. After inserting pipes into the above openings, they are sealed with rubber stoppers.

[0045] The main body portion 121 is provided with a rotation speed adjustment knob and a rotation speed display screen. The rotation speed required for the experiment can be set to drive the rotor portion 122 in the housing 11 to stir the calcium carbonate synthesis solution to ensure the uniformity of its composition.

[0046] In this technical solution, the main body portion 121 is configured to drive the rotor portion 122 to rotate through magnetic force. When the liquid adding module 30 replenishes the second reaction solution and the third reaction solution to the reaction chamber during the reaction process, the first reaction solution, the second reaction solution, and the third reaction solution are stirred by the magnetic stirrer 12 to ensure the uniformity of their composition, thereby increasing the accuracy of the experiment.

[0047] According to some embodiments of the present application, the carbonate mineral synthesis experimental device 100 further includes a storage rack 60. The storage rack 60 includes a first storage platform 601 and a second storage platform 602 located above the first storage platform 601. The main body portion 121 is arranged on the first storage platform 601. The liquid adding module 30 includes a dual-channel micro-injection pump 31 and two first syringes 32. The dual-channel micro-injection pump 31 is arranged on the second storage platform 602. The two first syringes 32 are respectively used to accommodate two second reaction solutions and the third reaction solution. The two first syringes 32 are respectively communicated with the reaction chamber. The dual-channel micro-injection pump 31 is used to drive the two first syringes 32 to provide the second reaction solution and the third reaction solution to the reaction chamber.

[0048] The dual-channel micro-injection pump 31 is provided with abutting blocks corresponding to two first syringes 32. The two first syringes 32 are fixed on the dual-channel micro-injection pump 31. The two abutting blocks respectively abut against the push rods of the two first syringes 32. The driving member in the dual-channel micro-injection pump 31 drives the two abutting blocks to move so as to drive the push rods to compress the space in the first syringe 32, thereby enabling the reaction solution in the first syringe 32 to enter the reaction chamber. The above driving member can be a linear module. The dual-channel micro-injection pump 31 is provided with injection parameter setting buttons and an injection pump display screen, and the rate at which the driving member drives the abutting blocks to move can be adjusted according to experimental needs, so as to adjust the injection rate and injection volume of the two first syringes 32.

[0049] In this technical solution, the first placement platform 601 and the second placement platform 602 arrange the reaction module 10 and the liquid addition module 30 along the gravity direction, so that the reaction module 10 and the liquid addition module 30 can make full use of the space in the environmental control module 20 in the gravity direction.

[0050] According to some embodiments of the present application, the dual-channel micro-injection pump 31 has a stop switch 311. The second placement platform 602 has a hollow area 6021 for accommodating the stop switch 311. The placement rack 60 further includes a connecting pipe 61, a slider 62 and a one-way valve. One end of the connecting pipe 61 is communicated with the hollow area 6021. The slider 62 is slidably arranged in the connecting pipe 61. The slider 62 blocks the connecting pipe 61. The other end of the connecting pipe 61 is communicated with the reaction chamber through the one-way valve. The one-way valve is configured to allow the gas in the reaction chamber to enter the connecting pipe 61 when the pressure in the reaction chamber is greater than a second threshold, so as to drive the slider 62 to abut against the stop switch 311. The second threshold is greater than the first threshold.

[0051] The stop switch 311 can be the power switch of the dual-channel micro-injection pump 31.

[0052] Exemplarily, the second threshold can be the air pressure in the reaction chamber when the total injection volume of the two reagents is equal to or slightly less than 4% of the volume of the calcium carbonate synthesis solution originally in the reaction chamber.

[0053] Assume that the gas follows the ideal gas state equation and the calcium carbonate synthesis solution follows the ideal liquid state equation: P1V1 / T = P2V2 / T.

[0054] Wherein, P1 is the pressure of the gas in the reaction chamber before supplementing the reaction solution, V1 is the volume of the gas in the reaction chamber before supplementing the reaction solution, P2 is the pressure of the gas in the reaction chamber after supplementing the reaction solution, and V2 is the volume of the gas in the reaction chamber after supplementing the reaction solution.

[0055] Exemplarily, with the reaction chamber volume of 200 cm 3For example, if the volume of the calcium carbonate synthetic solution originally in the reaction chamber is 100 mL, it can be calculated that the pressure of the gas in the reaction chamber after adding 4 mL of the calcium carbonate synthetic solution is 208.3 kPa, so the second threshold value can be set to a value greater than 200 kPa and less than 208.3 kPa.

[0056] It can be understood that there is a gap between the hollow area 6021 and the dual-channel microinjection pump 31 for the pump to pass through. The one-way valve and the connecting tube 61 can be detachably connected, so that the end of the connecting tube 61 connected to the one-way valve can be connected to the outside by disassembling the one-way valve, thereby facilitating the recovery of the slider 62.

[0057] Specifically, when the dual-channel micro-injection pump 31 drives the second reaction solution and the third reaction solution in the first syringe 32 to enter the reaction chamber, the pressure in the reaction chamber will gradually increase to be greater than the first threshold value and greater than the second threshold value, so that the gas in the reaction chamber passes through the one-way valve and enters the connecting tube 61 to drive the slider 62 to abut against the stop switch 311, so that by adjusting the set value of the second threshold value, when the supplemented second reaction solution and the third reaction solution are about to exceed the experimental requirements, the dual-channel micro-injection pump 31 can be closed by abutting the slider 62 against the stop switch 311, so that the supplemented second reaction solution and the third reaction solution are within the experimental requirements, so that the changes in the total volume, salinity, and dissolved organic matter concentration of the calcium carbonate synthesis solution during the calcium carbonate synthesis process can be ignored, thereby improving the reliability of the experiment.

[0058] According to some embodiments of the present application, the gas control module 40 includes a gas source 41 and a pressure gauge. The gas source 41 is connected to the reaction chamber and is used to provide reaction gas to the reaction chamber. The pressure gauge is used to detect the pressure of the carbon dioxide gas provided by the gas source 41.

[0059] Exemplarily, the reaction gas is a binary standard gas consisting of carbon dioxide and nitrogen.

[0060] It can be understood that the gas source 41 can be a high-pressure gas cylinder, which contains a binary standard gas composed of carbon dioxide and nitrogen. The molar ratio of the two gases is determined according to the natural atmospheric environment that needs to be simulated in the experiment. The pressure gauge is a pressure gauge that comes with the gas cylinder valve installed on the high-pressure gas cylinder. The pressure of the released gas is adjusted by rotating the gas cylinder valve above the high-pressure gas cylinder and observing the pressure gauge.

[0061] In the present technical solution, a pressure gauge is used to detect the pressure of the carbon dioxide gas provided by the gas source 41, so that the carbon dioxide dissolved in the solution reaches an equilibrium state during the reaction process, thereby stabilizing the hydrogen ion concentration index, thereby reducing the influence of other factors on the crystallization of calcium carbonate, thereby improving the reliability of the experiment.

[0062] According to some embodiments of the present application, the gas control module 40 further includes a safety valve 42. The safety valve 42 is in communication with the reaction chamber and is configured to allow the gas in the reaction chamber to be discharged through the safety valve 42 when the pressure in the reaction chamber is greater than a third threshold, and the third threshold is greater than the second threshold.

[0063] In this technical solution, the safety valve 42 is configured to allow the gas in the reaction chamber to be discharged through the safety valve 42 when the pressure in the reaction chamber is greater than a third threshold, and the third threshold is greater than the second threshold, so as to relieve the pressure of the reaction chamber when the pressure is too high, thereby improving the safety of the experiment.

[0064] According to some embodiments of the present application, the gas control module 40 further includes a buffer member 43. The buffer member 43 has a buffer chamber for containing a buffer solution, and has an air inlet below the liquid level of the buffer solution and an air outlet above the liquid level of the buffer solution. The air inlet is in communication with the gas source 41, and the air outlet is in communication with the reaction chamber.

[0065] Exemplarily, the buffer member 43 can be an Erlenmeyer flask, and the buffer solution can be, where the solution is a sodium chloride solution with the same ionic strength as the calcium carbonate synthesis solution, which is used to buffer the gas entering the calcium carbonate synthesis solution and compensate for the loss caused by the airflow to the calcium carbonate synthesis solution.

[0066] Exemplarily, the safety valve 42 can be provided on the pipeline connecting the reaction chamber and the buffer member 43 and is in parallel with the reaction chamber.

[0067] In this technical solution, the buffer member 43 buffers the high-pressure carbon dioxide gas to reduce the loss caused by the airflow to the calcium carbonate synthesis solution.

[0068] According to some embodiments of the present application, the environmental control module 20 includes a box body 21 and a heating element. The reaction module 10, the liquid addition module 30, and the monitoring module 50 are accommodated in the box body 21. The heating element is provided in the box body 21 and is used to provide heat to the inside of the box body 21 to provide heat to the reaction chamber.

[0069] Exemplarily, the environmental control module 20 can be a biochemical incubator, and the temperature for synthesizing calcium carbonate can be set through the incubator parameter setting buttons. The working state of the biochemical incubator can be displayed on the incubator display screen in real time.

[0070] In this technical solution, the reaction module 10, the liquid addition module 30, and the monitoring module 50 are accommodated in the box body 21 so that the reaction chamber can react at a constant temperature, and at the same time, the temperature difference between the supplemented second reaction solution and the third reaction solution and the solution in the reaction chamber is reduced, thereby reducing the inaccuracy of the experimental data caused by the temperature change of the solution in the reaction chamber due to the supplemented second reaction solution and the third reaction solution.

[0071] According to some embodiments of the present application, the monitoring module 50 includes a pH composite electrode 52 and a temperature probe. The pH composite electrode 52 is located in the reaction chamber and is used to detect the pH of the solution in the reaction chamber, and the temperature probe is located in the reaction chamber and is used to detect the temperature of the solution in the reaction chamber.

[0072] The pH detector 51 in the monitoring module 50 has an automatic temperature compensation function, and can simultaneously monitor the pH and temperature of the calcium carbonate synthesis solution in real time through the pH composite electrode 52. The parameters for automatically storing the test results can be set through the parameter setting button of the pH detector 51. The pH composite electrode 52 is fixed at the mouth of the five-neck round-bottom flask through the pH composite electrode fixing rubber stopper.

[0073] According to some embodiments of the present application, the monitoring module 50 includes a sampler, and the sampler is communicated with the reaction chamber for extracting the solution in the reaction chamber.

[0074] Exemplarily, the sampler can be a second syringe, and the second sampler and the connecting pipe 61 are alternatively detachably communicated with the reaction chamber. The sampler can sample the calcium carbonate synthesis solution along the sampling conduit at any time according to the experimental needs, and then the collected sample can be analyzed and tested on a machine, so as to monitor the change of the concentration of each component in the solution.

[0075] Specifically, when conducting experiments using the above-mentioned carbonate mineral synthesis experimental device 100, a first reaction solution and dissolved organic matter with different concentrations are injected into the accommodation chamber. The first reaction solution mainly contains 10 mM of CaCl2 and 2 mM of Na2CO3 (set according to the concentration in seawater to ensure that the first reaction solution is a saturated solution of CaCO3), as well as NaCl for regulating the ionic strength of the solution (the concentration is set according to the required ionic strength). In addition, MgCl2 with different concentrations can also be set according to experimental needs. Throughout the process of carbonate mineral synthesis, the first reaction solution and the dissolved organic matter are both placed on a magnetic stirrer 12 operating at 350 revolutions per minute. The dual-channel micro-injection pump 31 is used to simultaneously inject the CaCl2 solution and the Na2CO3 solution into the first reaction solution at the same rate. Considering the dilution effect, the concentrations of the two solutions are set to 1.02 M and 1.004 M respectively. The ventilation device is used to promote the chemical equilibrium of the CO2 system between the solution and the ambient gas, thereby achieving the purpose of maintaining the relative stability of the solution pH value. The gas contained in the gas source 41 is generally air, and other gases can also be used according to experimental needs (in this experiment, pure N2 is used to make the solution have a high pH value, and a binary standard gas composed of 1% CO2 and 99% N2 is used to make the solution have a low pH value). The sampler in the monitoring module 50 can extract a part of the solution in the reaction chamber at any time. Later, the change in the Ca 2+ concentration in the solution in the reaction chamber will be monitored through ICP-OES (Inductively Coupled Plasma Optical Emission Spectrometry) testing, the change in the fulvic acid concentration in the solution in the reaction chamber will be monitored through TOC (Total Organic Carbon) concentration testing, and the change in the concentration of each component in the solution in the reaction chamber will be monitored through three-dimensional fluorescence spectroscopy testing. The pH detector 51 (Leici PHSJ-3F, with automatic temperature compensation function) can monitor the changes in the solution temperature and pH value in real time. The environmental control module 20 can ensure that the synthesis of carbonate minerals is carried out under constant temperature conditions. The temperature is generally set to 20 °C (the temperature fluctuation range is ±1 °C, and in some experiments, the temperature will be set to 13 °C or 27 °C). The solution in the reaction chamber (2 mL each time) is collected through the sampling device by switching the connecting tube 61 every 30 minutes for relevant tests. After the dual-channel micro-injection pump 31 completes 10 hours of injection, the dual-channel micro-injection pump 31 is turned off, the solution in the reaction chamber is filtered, and the synthesized carbonate minerals are collected. The collected minerals are washed 3 times with ultrapure water (as much as possible to remove the dissolved organic matter adsorbed on the surface of the carbonate minerals) and then placed in an oven at 50 °C for two days to dry, so as to complete the collection of carbonate minerals.

[0076] It should be noted that, without conflict, the embodiments and features in the embodiments of the present application can be combined with each other.

[0077] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A carbonate mineral synthesis experimental device, characterized in that: include: A reaction module having a reaction chamber for accommodating a first reaction solution and dissolved organic matter; An environmental control module, used for providing heat to the reaction chamber to maintain the reaction temperature; A liquid adding module, used for adding the second reaction solution and the third reaction solution into the reaction chamber; A gas control module, used for providing reaction gas into the reaction chamber, so that the pressure in the reaction chamber is maintained at a first threshold value, thereby maintaining a stable carbonate mineral synthesis gas environment; A monitoring module, used to monitor reaction parameters in the reaction chamber; A controller is electrically connected to the reaction module, the environment control module and the liquid adding module.

2. A carbonate mineral synthesis experimental device according to claim 1, characterized in that: The reaction module comprises: A shell having the reaction chamber therein; The magnetic stirrer comprises a main body and a mover, wherein the main body has a bearing surface for bearing the shell, the mover is arranged in the reaction chamber, and the main body is configured to drive the mover to rotate by magnetic force.

3. A carbonate mineral synthesis experimental device according to claim 2, characterized in that: The carbonate mineral synthesis experimental device also includes: The storage rack comprises a first storage platform and a second storage platform located above the first storage platform, wherein the main body is arranged on the first storage platform; The liquid adding module comprises: A dual-channel microinjection pump, arranged on the second placement platform; The two first syringes are used to contain the second reaction solution and the third reaction solution respectively. The two first syringes are connected to the reaction chamber respectively. The dual-channel microinjection pump is used to drive the two first syringes to provide the second reaction solution and the third reaction solution into the reaction chamber.

4. A carbonate mineral synthesis experimental device according to claim 3, characterized in that: The dual-channel microinjection pump has a stop switch, and the second storage platform has a hollow area for accommodating the stop switch; The storage rack also includes: A connecting tube, one end of which is connected to the hollow area; A slider is slidably disposed in the connecting tube, and the slider separates the connecting tube; A one-way valve, the other end of the connecting tube is connected to the reaction chamber through the one-way valve, and the one-way valve is configured to allow the gas in the reaction chamber to enter the connecting tube when the pressure in the reaction chamber is greater than a second threshold value, so as to drive the slider to abut against the stop switch, and the second threshold value is greater than the first threshold value.

5. A carbonate mineral synthesis experimental device according to claim 4, characterized in that: The gas control module comprises: a gas source, connected to the reaction chamber and used to provide reaction gas into the reaction chamber; A pressure gauge is used to detect the pressure of the reaction gas provided by the gas source.

6. A carbonate mineral synthesis experimental device according to claim 5, characterized in that: The gas control module further comprises: A safety valve is connected to the reaction chamber, and the safety valve is configured to discharge the gas in the reaction chamber through the safety valve when the pressure in the reaction chamber is greater than a third threshold, and the third threshold is greater than the second threshold.

7. A carbonate mineral synthesis experimental device according to claim 6, characterized in that: The gas control module further comprises: The buffer member has a buffer cavity for accommodating a buffer solution, and has an air inlet located below the liquid surface of the buffer solution and an air outlet located above the liquid surface of the buffer solution, the air inlet is connected to the air source, and the air outlet is connected to the reaction chamber.

8. The carbonate mineral synthesis experimental device according to claim 1, characterized in that: The environmental control module comprises: A box body, in which the reaction module, the liquid adding module and the monitoring module are accommodated; The heating element is arranged in the box body and is used to provide heat to the inside of the box body so as to provide heat to the reaction chamber.

9. The carbonate mineral synthesis experimental device according to claim 1, characterized in that: The monitoring module comprises: A hydrogen ion concentration index composite electrode, located in the reaction chamber and used to detect the hydrogen ion concentration index of the first reaction solution; The temperature probe is located in the reaction chamber and is used to detect the temperature of the first reaction solution.

10. The carbonate mineral synthesis experimental device according to claim 1, characterized in that: The monitoring module includes a sampler, which is communicated with the reaction chamber and is used to extract the first reaction solution and dissolved organic matter in the reaction chamber.

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