A solid waste-based foamed lightweight soil production device and method using carbonization to adjust consistency

Abstract

The present invention relates to a solid waste-based foamed lightweight soil production device and method for adjusting consistency by carbonization, belonging to the field of foamed lightweight soil preparation, including a mix ratio parameter system and a mixing system, the mix ratio parameter system can obtain the optimal amount of carbon dioxide, and adjust the carbonized slurry to a suitable consistency; the present invention treats solid waste slurry by CO2, after the introduction of carbon dioxide, a part of free magnesium oxide and calcium oxide in the calcium or magnesium solid waste slurry reacts with carbon dioxide to generate nano calcium carbonate and magnesium carbonate and adheres to the surface of solid waste particles, the generation of these nano materials increases the sites for the attachment and growth of hydration products on the one hand, and increases the specific surface area of ​​solid particles in the slurry on the other hand, thereby changing the rheological properties of the solid waste slurry such as yield stress and plastic viscosity. By controlling the appropriate carbonization rate and consistency, the present invention prepares lightweight soil bubbles with more uniform and dense size, higher overall strength, and realizes the strength supplement of solid waste-based foamed lightweight soil.

Description

Technical Field

[0001] The invention relates to a device and method for producing solid waste-based foamed lightweight soil by adjusting consistency through carbonization, and belongs to the technical field of foamed lightweight soil preparation. Background Art

[0002] Foamed lightweight soil is a new type of cement-based material containing a large number of closed pores, with excellent properties such as light weight, good integrity, and fast construction speed. In order to reduce the use cost and production energy consumption of foamed lightweight soil, industrial solid wastes such as fly ash and carbide slag are usually used to replace part or all of the cement to prepare solid waste-based lightweight soil.

[0003] In an aqueous medium, the active silicon oxide and aluminum oxide substances contained in the solid waste can react with calcium hydroxide to produce volcanic ash substances such as calcium silicate, calcium aluminate and calcium aluminosilicate, thereby converting the reaction system into a gel block with a certain strength.

[0004] The overall strength of lightweight soil is mainly affected by two aspects: matrix strength and pore structure. Since the activity of solid waste is much lower than that of cement, the strength of the lightweight soil matrix will decrease accordingly after replacing cement. In order to compensate for this shortcoming, it is possible to consider optimizing the pore structure of solid waste-based lightweight soil by improving the rheological properties of solid waste slurry. It is generally believed that under the premise of certain matrix strength and porosity, the smaller and more uniform the pores, the higher the strength of the lightweight soil.

[0005] Practice has shown that introducing carbon dioxide into solid waste slurry can change its rheological properties and make the slurry thicker. The appropriate consistency can optimize the pore structure of the produced lightweight soil and make up for the strength loss caused by the decrease in matrix strength.

[0006] At present, there is an urgent need for a solid waste-based foam lightweight soil production device and method that uses carbonization to adjust the consistency to meet the demand. Summary of the invention

[0007] In view of the deficiencies in the prior art, the present invention provides a device and method for producing solid waste-based foamed lightweight soil by adjusting the consistency through carbonization.

[0008] The present invention adopts the following technical solutions:

[0009] A solid waste-based foamed lightweight soil production device that uses carbonization to adjust consistency, including a mix ratio parameter system and a mixing system;

[0010] The main function of the mix ratio parameter system is to obtain the optimal amount of carbon dioxide for carbonization and adjust the carbonized slurry to a suitable consistency, including a reference slurry bottle, a reference carbonized slurry bottle, a reference CO2 gas cylinder and a controller. The reference slurry bottle and the reference carbonized slurry bottle are used to hold reference cement slurry and carbonized slurry respectively. The bottom of the reference slurry bottle and the reference carbonized slurry bottle are both provided with a mass sensor, and the top is provided with a bottle cap, and the bottle cap is provided with a grouting port and a stirring blade rotary rod interface. The reference slurry bottle and the reference carbonized slurry bottle are both connected to the stirring blade through the stirring blade rotary rod interface, and the stirring blade is equipped with a resistance sensor;

[0011] The reference CO2 gas cylinder is connected to the reference carbonized slurry bottle and is used to introduce CO2 into the reference carbonized slurry bottle. A CO2 residual detection meter is provided at the outlet of the reference CO2 gas cylinder, which can reflect the residual amount in the gas cylinder in real time. The residual gas information can be presented to the system controller, so as to calculate the amount of carbon dioxide consumed after the solid waste slurry is mineralized to a certain extent; the mass sensor, the stirring blade rotary rod, the resistance sensor and the CO2 residual detection meter are all connected to the controller;

[0012] The mixing system comprises a carbonization chamber, a CO2 gas tank and a bubbling chamber, and is used to complete the mixing, carbonization, bubbling and pumping processes.

[0013] The production device of the present invention can achieve: introducing a proper amount of carbon dioxide into calcium (or magnesium)-containing industrial solid waste slurry to change the slurry properties, and then mixing foam therewith to prepare solid waste-based foam lightweight soil with good performance.

[0014] The function of the resistance sensor on the stirring blade is to stir the slurry and to present the resistance information of the blade during the stirring process to the controller. The sensing principle of the resistance sensor is as follows: During the stirring process of the stirring blade, slurries of different consistencies have different reaction forces on the blade. The greater the consistency of the slurry, the greater the reaction force on the blade. When the reaction force acts on the resistance sensor, it will change the resistance value of the force-sensitive resistor in the sensor. The change in resistance value can reflect the magnitude of the slurry reaction force, thereby indirectly indicating the degree of carbonization of the slurry.

[0015] The resistance sensor and the stirring blade adopt an integrated design, that is, the resistance sensor and its circuit are preset in the stirring blade, and the terminal extends out of the bottle from the stirring blade rotating rod interface at the bottle cap along with the rotating rod of the stirring blade.

[0016] It should be noted that the resistance sensor used in the present invention can adopt FlexiForce force sensitive sensor A201, the mass sensor model can be Zhongnuo force transmission ZNLBM-Ⅹ, the receiving device Ang HZC-H1, etc., and other components can select existing conventional models.

[0017] Preferably, the carbonization chamber is provided with a carbonization chamber feed port, a carbonization chamber water injection port, a pH meter and a water meter, and a stirrer is installed therein, and the slurry is mixed and carbonized in the chamber, and the CO2 gas tank is used to provide the carbon source required for the carbonization of the slurry, and the CO2 gas tank is connected to the carbonization chamber through a pipeline, and a valve and a pump are sequentially arranged on the pipeline;

[0018] The pH meter is used to display the pH value of the mixed slurry to monitor the carbonization degree of the slurry; the water meter can reflect the amount of water in the mixing chamber, which is convenient for controlling the water-cement ratio.

[0019] The component connection process is:

[0020] First, install the carbonization chamber. There are multiple interfaces on the carbonization chamber, which are used to connect with other parts of the equipment. Then install the pH meter and water meter at the corresponding interfaces of the mixing chamber. Pay attention to adjusting the relative positions of the water injection port, feed port, and discharge port of the mixing chamber to ensure convenient feeding and discharging. Further, connect the CO2 gas tank, valve, and pump in series, and connect the terminal interface to the corresponding interface of the carbonization chamber. Further, connect the bubble outlet of the bubbling chamber in parallel with the slurry outlet of the carbonization chamber, and then connect the pump in series after the parallel connection is completed.

[0021] Preferably, a foaming machine is installed in the foaming chamber, and the aqueous solution of the foaming agent can be foamed by a mechanical method. The outlet of the carbonization chamber is mixed with the bubbles in the foaming chamber through a valve and pumped out to the discharge port.

[0022] Preferably, the bottle cap is detachably connected to facilitate discharging, cleaning, etc.;

[0023] Preferably, the mass sensor has an accuracy of more than 0.1 g and is used to measure the mass change of the contents in the reference slurry bottle and the reference carbonized slurry bottle;

[0024] Preferably, a vent valve is provided on the pipeline connecting the reference CO2 gas cylinder and the reference carbonized slurry bottle, and the vent valve is connected to the controller.

[0025] Preferably, the controller is a computer with data processing function, which can control the switch of the entire mix parameter system and collect data from the resistance sensor, CO2 residual detection table, etc., and has the function of performing simple calculations and processing on the data.

[0026] A method for producing solid waste-based foamed lightweight soil by adjusting consistency through carbonization comprises the following steps:

[0027] (1) The amount of carbon dioxide required to carbonize a certain amount of calcium (or magnesium)-containing solid waste to an appropriate degree is obtained in advance through a mix ratio parameter system;

[0028] (2) Open the water injection port and feed port of the carbonization chamber, inject water and calcium (or magnesium)-containing solid waste respectively and stir, prepare calcium (or magnesium)-containing solid waste slurry, pay attention to observe the water meter when injecting water, and control the water volume in the chamber. The calcium (or magnesium)-containing solid waste has the same composition as in step (1), and the water-cement ratio is also controlled in the same way as in step (1);

[0029] (3) A CO2 gas cylinder is used to introduce CO2 into the carbonization chamber and stir the chamber. The amount of CO2 introduced is determined according to the ratio of the calcium (or magnesium)-containing solid waste obtained in step (1) to the required amount of carbon dioxide. After the required amount of CO2 is introduced, aeration is stopped first, stirring is maintained, and the pH meter reading is observed to see whether it reaches 7 after stabilization. If it reaches 7, the carbonization process is terminated. If not, aeration is continued until the pH meter reading reaches 7, and stirring and aeration are stopped, and the carbonization process is terminated.

[0030] (4) Inject the foaming solution into the foaming chamber, turn on the foaming machine, beat the solution to produce bubbles, then pump out the bubbles and carbonized solid waste slurry to mix them, and then pump them out for use.

[0031] Preferably, step (1) includes a process of initially determining the CO2 dosage and a process of fine-tuning the CO2 dosage;

[0032] The initial process of determining CO2 usage is:

[0033] The essence of the carbonization reaction is the acid-base neutralization reaction between CO2 and Ca(OH)2 (or Mg(OH)2) in the water medium: the calcium (or magnesium) contained in the solid waste powder reacts and dissolves in water to generate Ca(OH)2 (or Mg(OH)2), which then reacts with CO2. The reaction formula is as follows:

[0034] CaO+H2O→Ca(OH)2

[0035] Ca(OH)2+CO2→CaCO3+H2O

[0036] Turn on the controller, put 100g of calcium (or magnesium)-containing solid waste powder into the reference carbonized slurry bottle. The calcium (or magnesium)-containing solid waste powder can be a compound of multiple groups of materials, and the calcium (or magnesium) content is between 5% and 10%. Water is added to the reference carbonized slurry bottle according to the required water-cement ratio. Then, the controller controls the stirring blade of the reference carbonized slurry to start stirring. After stirring evenly, the controller collects the mass sensor information m1 at the bottom of the reference carbonized slurry bottle at this time;

[0037] Open the reference CO2 gas cylinder to ventilate the reference carbonized slurry bottle. The controller collects the mass sensor information m2 at the bottom of the reference carbonized slurry bottle in real time and calculates the reference carbonization rate in real time. The reference carbonization rate is determined by formula (1):

[0038] (m2-m1) / m1×100%=Baseline carbonization rate (1)

[0039] Where:

[0040] m1 is the mass of the contents of the reference carbonized slurry bottle before passing CO2, measured by the mass sensor at the bottom of the reference carbonized slurry bottle, g;

[0041] m2 is the mass of the contents of the reference carbonized slurry bottle after passing CO2, which is measured in real time by the mass sensor at the bottom of the reference carbonized slurry bottle, g;

[0042] When the reference carbonization rate reaches 20% to 30%, the controller automatically controls the closing of the ventilation valve of the reference CO2 gas cylinder to stop ventilation, and records the CO2 consumption Q1 at this time; pauses stirring, reads the mass m3 of the contents of the reference carbonization slurry bottle at this time, and prepares to enter the CO2 dosage fine-tuning process;

[0043] The process of fine-tuning CO2 dosage is as follows:

[0044] Prepare cement slurry with the same expected consistency in the reference slurry bottle as a reference. Its mass is the same as that of the content in the reference carbonized slurry bottle, both of which are m3. The controller controls to open the stirring blades of the reference slurry bottle and the reference carbonized slurry bottle and adjust the speed to be consistent. The controller controls to open the ventilation valve of the reference CO2 gas bottle and ventilate at a speed of 350-600mL / min. The resistance sensor on the stirring blade collects the resistance change data in real time and transmits it to the controller. The controller calculates the reference consistency increase rate in real time:

[0045] (f2-f1) / f1×100%=base consistency increase rate (2)

[0046] Where:

[0047] f1 is the stirring blade resistance of the reference carbonization slurry bottle measured in real time after continuous CO2 introduction during the fine adjustment of CO2 dosage, N;

[0048] f2 is the stirring blade resistance of the reference slurry bottle, N, which is a constant value;

[0049] When the base viscosity increase rate reaches about 5% of the base value of the viscosity increase rate, that is, when the base viscosity increase rate reaches 15% to 25%, the CO2 ventilation rate is reduced to 1 / 3 to 1 / 2 of the previous rate, and ventilation is continued until the viscosity increase rate reaches the base value of the viscosity increase rate, which is 20% to 30%. When judging whether the base value has been reached, ventilation should be suspended first, and a judgment should be made after the viscosity increase rate stabilizes;

[0050] The controller automatically disconnects the ventilation and records the amount of CO2 used in this stage, Q2;

[0051] The amount of carbon dioxide required to carbonize 100g of calcium (or magnesium) solid waste powder to an appropriate degree is Q1+Q2, that is, the mass ratio of calcium (or magnesium) solid waste of the same component to the required amount of carbon dioxide is obtained. This relationship will provide a quantitative basis for the mixing system. After using the mixing parameterization system, the reference bottle and stirring blades should be cleaned immediately to prevent the slurry from solidifying and adhering to affect the next use.

[0052] Preferably, in step (2), the mixer in the mixing chamber is operated at 550-1100 r / min. -1 Stir at a speed of 5 minutes until the pH stabilizes and the water-cement ratio is 0.35-0.55.

[0053] Preferably, in step (3), the temperature is 1.2-1.5 L·min -1 CO2 is introduced into the slurry at a flow rate of 450-1050 r / min during the aeration process to ensure that the carbonization reaction proceeds fully.

[0054] Where the present invention is not exhaustive, prior art may be used.

[0055] The beneficial effects of the present invention are:

[0056] 1. The present invention makes full use of solid waste containing calcium and magnesium, effectively solving the problem of solid waste treatment;

[0057] 2. A large amount of carbon dioxide will be consumed in the production process of the carbonized solid waste-based foamed lightweight soil of the present invention, and converted into the strength of the foamed lightweight soil, thereby reducing CO2 emissions and helping my country's "carbon peak" and "carbon neutrality" process.

[0058] 3. The present invention treats solid waste slurry with CO2. After the introduction of carbon dioxide, a portion of free calcium oxide and magnesium oxide in the calcium (or magnesium) solid waste slurry can react with carbon dioxide to generate nano calcium carbonate and magnesium carbonate and adhere to the surface of solid waste particles. The generation of these nano materials increases the sites for the attachment and growth of hydration products on the one hand, and increases the specific surface area of ​​solid particles in the slurry on the other hand, thereby changing the rheological properties of the solid waste slurry, such as yield stress and plastic viscosity (macroscopically manifested as thickening of the slurry). By controlling the appropriate carbonization rate and consistency, the bubble size of the prepared lightweight soil will be more uniform, finer, and the overall strength will be higher, thereby achieving the strength supplement of solid waste-based foam lightweight soil.

[0059] 4. Compared with general lightweight soil, the solid waste-based carbonized lightweight soil produced by the present invention effectively reduces production energy consumption while maintaining the characteristics of light weight and good construction performance, thereby making the application range of lightweight soil wider. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] Figure 1It is a schematic diagram of the structure of the mix ratio parameter system of the present invention;

[0061] Figure 2 It is a schematic diagram of the structure of the mixing system of the present invention;

[0062] Among them, 1-controller, 2-grouting port, 3-reference slurry bottle, 4-bottle cap, 5-quality sensor, 6-reference carbonization slurry bottle, 7-reference CO2 gas cylinder, 8-stirring blade, 9-resistance sensor, 10-CO2 gas tank, 11-valve, 12-pump, 13-water injection port, 14-pH meter, 15-feeding port, 16-water meter, 17-carbonization chamber, 18-bubbling chamber, 19-discharging port. DETAILED DESCRIPTION

[0063] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, they will be described in detail with reference to the accompanying drawings and specific embodiments, but are not limited to these. Anything not fully described in the present invention shall be based on conventional techniques in the art.

[0064] Embodiment 1:

[0065] A solid waste-based foam lightweight soil production device using carbonization to adjust consistency, such as Figure 1-2 As shown, it includes mix ratio parameter system and mixing system;

[0066] The main function of the mix ratio parameter system is to obtain the optimum amount of carbon dioxide for carbonization and adjust the carbonized slurry to a suitable consistency, including a reference slurry bottle 3, a reference carbonized slurry bottle 6, a reference CO2 gas cylinder 7 and a controller 1. The reference slurry bottle 3 and the reference carbonized slurry bottle 6 are used to contain reference cement slurry and carbonized slurry respectively. The bottom of the reference slurry bottle 3 and the reference carbonized slurry bottle 6 are both provided with a mass sensor 5, and the top is provided with a bottle cap 4. The bottle cap 4 is provided with a grouting port 2 and a stirring blade rotary rod interface. The reference slurry bottle 3 and the reference carbonized slurry bottle 6 are both connected to a stirring blade 8 through the stirring blade rotary rod interface, and a resistance sensor 9 is installed on the stirring blade 8;

[0067] The reference CO2 gas cylinder 7 is connected to the reference carbonized slurry bottle 6 and is used to introduce CO2 into the reference carbonized slurry bottle. A CO2 residual detection meter is provided at the outlet of the reference CO2 gas cylinder, which can reflect the residual amount in the gas cylinder in real time. The residual gas information can be presented to the system controller, so as to calculate the amount of carbon dioxide consumed after the solid waste slurry is mineralized to a certain extent; the mass sensor 5, the stirring blade rotary rod, the resistance sensor 9 and the CO2 residual detection meter are all connected to the controller 1;

[0068] The mixing system includes a carbonization chamber 17, a CO2 gas tank 10 and a bubbling chamber 18, which are used to complete the mixing, carbonization, bubbling and pumping processes.

[0069] The production device of the present invention can achieve: introducing a proper amount of carbon dioxide into calcium (or magnesium)-containing industrial solid waste slurry to change the slurry properties, and then mixing foam therewith to prepare solid waste-based foam lightweight soil with good performance.

[0070] The function of the resistance sensor 9 on the stirring blade is to stir the slurry and to present the resistance information of the blade during the stirring process to the controller 1. The sensing principle of the resistance sensor 9 is as follows: during the stirring process of the stirring blade, slurries of different consistencies have different reaction forces on the blade. The greater the consistency of the slurry, the greater the reaction force on the blade. When the reaction force acts on the resistance sensor, it will change the resistance value of the force-sensitive resistor in the sensor. The change in the resistance value can reflect the magnitude of the slurry reaction force, thereby indirectly indicating the degree of carbonization of the slurry.

[0071] The resistance sensor and the stirring blade adopt an integrated design, that is, the resistance sensor and its circuit are preset in the stirring blade, and the terminal extends out of the bottle from the stirring blade rotating rod interface at the bottle cap along with the rotating rod of the stirring blade.

[0072] In this embodiment, the resistance sensor is FlexiForce force sensitive sensor A201, and the mass sensor model is HZC-H1.

[0073] Embodiment 2:

[0074] A solid waste-based foam lightweight soil production device for adjusting consistency by carbonization, as described in Example 1, except that a carbonization chamber 17 is provided with a carbonization chamber feed port 15, a carbonization chamber water injection port 13, a pH meter 14 and a water meter 16, a stirrer is installed therein, and the slurry is mixed and carbonized in the chamber, a CO2 gas tank 10 is used to provide a carbon source required for slurry carbonization, and the CO2 gas tank 10 is connected to the carbonization chamber through a pipeline, and a valve 11 and a pump 12 are sequentially arranged on the pipeline;

[0075] The pH meter 14 is used to display the pH value of the mixed slurry to monitor the carbonization degree of the slurry; the water meter 16 can reflect the water volume in the mixing chamber to facilitate the control of the water-cement ratio.

[0076] The component connection process is:

[0077] First, install the carbonization chamber 17. There are multiple interfaces on the carbonization chamber, which are used to connect with other parts of the equipment; then install the pH meter 14 and the water meter 16 at the corresponding interfaces of the mixing chamber, and pay attention to adjusting the relative positions of the water injection port 13, the feed port 15, and the discharge port 19 to ensure convenient feeding and discharging. Further, connect the CO2 gas tank 10, valve, and pump in series, and connect the terminal interface to the corresponding interface of the carbonization chamber. Further, connect the bubble outlet of the bubbling chamber in parallel with the slurry outlet of the carbonization chamber, and after the parallel connection is completed, connect the pump in series.

[0078] Embodiment 3:

[0079] A solid waste-based foam lightweight soil production device that uses carbonization to adjust the consistency is as described in Example 2, except that a foaming machine is installed in the foaming chamber 18, and the aqueous solution of the foaming agent can be foamed by mechanical means. The outlet of the carbonization chamber is mixed with the bubbles in the foaming chamber and pumped out to the discharge port 19 through another valve.

[0080] Embodiment 4:

[0081] A solid waste-based foamed lightweight soil production device using carbonization to adjust the consistency, as described in Example 3, except that the bottle cap is detachably connected to facilitate discharge, cleaning, etc.;

[0082] The mass sensor 5 has an accuracy of more than 0.1 g and is used to measure the mass change of the contents in the reference slurry bottle and the reference carbonized slurry bottle;

[0083] A vent valve is provided on the pipeline connecting the reference CO2 gas cylinder 7 and the reference carbonized slurry bottle, and the vent valve is connected to the controller 1.

[0084] The controller 1 is a computer with data processing function, which can control the switch of the entire mix parameter system and collect data from the resistance sensor, CO2 residual detection table, etc., and has the function of performing simple calculations and processing on the data.

[0085] Embodiment 5:

[0086] A method for producing solid waste-based foamed lightweight soil by adjusting consistency through carbonization comprises the following steps:

[0087] (1) The amount of carbon dioxide required to carbonize a certain amount of calcium (or magnesium)-containing solid waste to an appropriate degree is obtained in advance through a mix ratio parameter system;

[0088] (2) Open the water injection port 13 and the feed port 15 of the carbonization chamber, inject water and calcium (or magnesium)-containing solid waste respectively and stir, and prepare calcium (or magnesium)-containing solid waste slurry. When injecting water, pay attention to observe the water meter 16 to control the water volume in the chamber. The calcium (or magnesium)-containing solid waste has the same composition as that in step (1), and the water-cement ratio is also controlled in the same way as in step (1);

[0089] (3) The CO2 cylinder 10 introduces CO2 into the carbonization chamber 17 and stirs the chamber. The amount of CO2 introduced is determined according to the ratio of the calcium (or magnesium)-containing solid waste obtained in step (1) to the required amount of carbon dioxide. After the required amount of CO2 is introduced, aeration is stopped and stirring is maintained. After the pH meter 14 reading stabilizes, observe whether it reaches 7. If so, the carbonization process is terminated. If not, aeration is continued until the pH meter 14 reading reaches 7, and stirring and aeration are stopped, and the carbonization process is terminated.

[0090] (4) The foaming solution is injected into the foaming chamber 18, and the foaming machine is turned on to beat the solution into bubbles, and then the bubbles and the carbonized solid waste slurry are pumped out to mix and pump out for use.

[0091] Embodiment 6:

[0092] A method for producing solid waste-based foamed lightweight soil by adjusting consistency by carbonization, as described in Example 5, except that step (1) includes a process of initially determining the CO2 dosage and a process of finely adjusting the CO2 dosage;

[0093] The initial process of determining CO2 usage is:

[0094] The essence of the carbonization reaction is the acid-base neutralization reaction between CO2 and Ca(OH)2 (or Mg(OH)2) in the water medium: the calcium (or magnesium) contained in the solid waste powder reacts and dissolves in water to generate Ca(OH)2 (or Mg(OH)2), which then reacts with CO2. The reaction formula is as follows:

[0095] CaO+H2O→Ca(OH)2

[0096] Ca(OH)2+CO2→CaCO3+H2O

[0097] Turn on the controller 1, put 100g of calcium (or magnesium)-containing solid waste powder into the reference carbonized slurry bottle 6, the calcium (or magnesium)-containing solid waste powder can be a compound of multiple groups of materials, and the calcium (or magnesium) content thereof is between 5% and 10%, and water is added to the reference carbonized slurry bottle 6 according to the required water-cement ratio, and then the controller 1 controls the stirring blade 8 of the reference carbonized slurry to start stirring. After stirring evenly, the controller 1 collects the mass sensor 5 information m1 at the bottom of the reference carbonized slurry bottle at this time;

[0098] Open the reference CO2 gas cylinder 7 to ventilate the reference carbonized slurry bottle 6. The controller 1 collects the mass sensor information m2 at the bottom of the reference carbonized slurry bottle in real time and calculates the reference carbonization rate in real time. The reference carbonization rate is determined by formula (1):

[0099] (m2-m1) / m1×100%=Baseline carbonization rate (1)

[0100] Where:

[0101] m1 is the mass of the contents of the reference carbonized slurry bottle 6 before passing CO2, measured by the mass sensor at the bottom of the reference carbonized slurry bottle, g;

[0102] m2 is the mass of the contents of the reference carbonized slurry bottle 6 after passing CO2, which is measured in real time by the mass sensor at the bottom of the reference carbonized slurry bottle, g;

[0103] When the reference carbonization rate reaches 20% to 30%, the controller 1 automatically controls the closing of the ventilation valve of the reference CO2 gas cylinder to stop ventilation, and records the CO2 consumption Q1 at this time; pauses stirring, reads the mass m3 of the contents of the reference carbonization slurry bottle at this time, and prepares to enter the CO2 dosage fine-tuning process;

[0104] The process of fine-tuning CO2 dosage is as follows:

[0105] In the reference slurry bottle 3, cement slurry with the same desired consistency is prepared in advance as a reference. Its mass is the same as that of the content of the reference carbonized slurry bottle, both of which are m3. The controller 1 controls to open the stirring blades of the reference slurry bottle 3 and the reference carbonized slurry bottle 6 and adjusts the rotation speed to be consistent. The controller 1 controls to open the ventilation valve of the reference CO2 gas cylinder and ventilate at a speed of 350-600mL / min. The resistance sensor 9 on the stirring blade collects the resistance change data in real time and transmits it to the controller 1. The controller 1 calculates the reference consistency increase rate in real time:

[0106] (f2-f1) / f1×100%=base consistency increase rate (2)

[0107] Where:

[0108] f1 is the stirring blade resistance of the reference carbonization slurry bottle measured in real time after continuous CO2 introduction during the fine adjustment of CO2 dosage, N;

[0109] f2 is the stirring blade resistance of the reference slurry bottle, N, which is a constant value;

[0110] When the base viscosity increase rate reaches about 5% of the base value of the viscosity increase rate, that is, when the base viscosity increase rate reaches 15% to 25%, the CO2 ventilation rate is reduced to 1 / 3 to 1 / 2 of the previous rate, and ventilation is continued until the viscosity increase rate reaches the base value of the viscosity increase rate, which is 20% to 30%. When judging whether the base value has been reached, ventilation should be suspended first, and a judgment should be made after the viscosity increase rate stabilizes;

[0111] Controller 1 controls the automatic disconnection of ventilation and records the CO2 consumption Q2 used in this stage;

[0112] The amount of carbon dioxide required to carbonize 100g of calcium (or magnesium) solid waste powder to an appropriate degree is Q1+Q2, that is, the mass ratio of calcium (or magnesium) solid waste of the same component to the required amount of carbon dioxide is obtained. This relationship will provide a quantitative basis for the mixing system. After using the mixing parameterization system, the reference bottle and stirring blades should be cleaned immediately to prevent the slurry from solidifying and adhering to affect the next use.

[0113] Embodiment 7:

[0114] A method for producing solid waste-based foamed lightweight soil by adjusting the consistency by carbonization, as described in Example 6, except that in step (2), the mixer in the mixing chamber is operated at 550-1100 r·min -1 Stir at a speed of 5 minutes until the pH stabilizes and the water-cement ratio is 0.35-0.55.

[0115] In step (3), the temperature was 1.2-1.5 L min. -1 CO2 is introduced into the slurry at a flow rate of 450-1050 r / min during the aeration process to ensure that the carbonization reaction proceeds fully.

[0116] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A solid waste-based foamed lightweight soil production device using carbonization to adjust consistency, characterized in that: Including mix ratio parameter system and mixing system; The mix ratio parameter system comprises a reference slurry bottle, a reference carbonized slurry bottle, a reference CO2 gas cylinder and a controller. The reference slurry bottle and the reference carbonized slurry bottle are used to contain reference cement slurry and carbonized slurry respectively. The reference slurry bottle and the reference carbonized slurry bottle are both provided with a mass sensor at the bottom and a bottle cap at the top. The bottle cap is provided with a grouting port and a stirring blade rotary rod interface. The reference slurry bottle and the reference carbonized slurry bottle are both connected to a stirring blade through the stirring blade rotary rod interface, and a resistance sensor is installed on the stirring blade. The reference CO2 gas cylinder is connected to the reference carbonized slurry bottle and is used to introduce CO2 into the reference carbonized slurry bottle. A CO2 residual detection meter is provided at the outlet of the reference CO2 gas cylinder for real-time detection of the CO2 residual; the mass sensor, the stirring blade rotary rod, the resistance sensor and the CO2 residual detection meter are all connected to the controller; The mixing system comprises a carbonization chamber, a CO2 gas tank and a bubbling chamber, and is used to complete the mixing, carbonization, bubbling and pumping processes.

2. The solid waste-based foamed lightweight soil production device using carbonization to adjust consistency according to claim 1 is characterized in that: The carbonization chamber is provided with a carbonization chamber feed port, a carbonization chamber water injection port, a pH meter and a water meter, and a stirrer is installed therein. The CO2 gas tank is connected to the carbonization chamber through a pipeline, and a valve and a pump are sequentially arranged on the pipeline.

3. The solid waste-based foamed lightweight soil production device using carbonization to adjust consistency according to claim 2 is characterized in that: The foaming chamber is equipped with a foaming machine to produce bubbles for foaming the light soil. The outlet of the carbonization chamber is mixed with the bubbles in the foaming chamber and pumped out to the discharge port through a valve.

4. The solid waste-based foamed lightweight soil production device using carbonization to adjust consistency according to claim 1 is characterized in that: The bottle cap is detachably connected; The mass sensor has an accuracy of more than 0.1 g and is used to measure the mass change of the contents in the reference slurry bottle and the reference carbonized slurry bottle.

5. The solid waste-based foamed lightweight soil production device using carbonization to adjust consistency according to claim 1 is characterized in that: A vent valve is provided on the pipeline connecting the reference CO2 gas cylinder and the reference carbonized slurry bottle, and the vent valve is connected to the controller.

6. The solid waste-based foamed lightweight soil production device using carbonization to adjust consistency according to claim 1 is characterized in that: The controller is a computer with data processing function.

7. A method for producing solid waste-based foamed lightweight soil by adjusting consistency through carbonization, characterized in that: The steps include: (1) obtaining in advance through a mix ratio parameter system the amount of carbon dioxide required to carbonize a certain amount of calcium or magnesium-containing solid waste to an appropriate degree; (2) opening the water injection port and the feed port of the carbonization chamber, respectively injecting water and calcium or magnesium-containing solid waste and stirring to prepare calcium or magnesium-containing solid waste slurry, wherein the calcium or magnesium-containing solid waste has the same composition as that in step (1), and the water-cement ratio is controlled in the same way as in step (1); (3) A CO2 gas cylinder is used to introduce CO2 into the carbonization chamber and stir the chamber. The amount of CO2 introduced is determined according to the ratio of the calcium or magnesium-containing solid waste obtained in step (1) to the required amount of carbon dioxide. After the required amount of CO2 is introduced, aeration is stopped first, stirring is maintained, and the pH meter reading is observed to see whether it reaches 7 after stabilization. If so, the carbonization process is terminated. If not, aeration is continued until the pH meter reading reaches 7, and stirring and aeration are stopped, and the carbonization process is terminated. (4) injecting the foaming solution into the foaming chamber, turning on the foaming machine, beating the solution to produce bubbles, then pumping out the bubbles and the carbonized solid waste slurry to mix them, and pumping them out for use; Step (1) includes a process of initially determining the CO2 dosage and a process of fine-tuning the CO2 dosage; The initial CO2 dosage process is as follows: Turn on the controller, put 100g of calcium or magnesium-containing solid waste powder into the reference carbonized slurry bottle, the calcium or magnesium content of the calcium or magnesium-containing solid waste powder is between 5% and 10%, and water is added to the reference carbonized slurry bottle according to the required water-cement ratio. Then, the controller controls the stirring blade of the reference carbonized slurry to start stirring. After stirring evenly, the controller collects the mass sensor information m1 at the bottom of the reference carbonized slurry bottle at this time; Open the reference CO2 gas cylinder to ventilate the reference carbonized slurry bottle. The controller collects the mass sensor information m2 at the bottom of the reference carbonized slurry bottle in real time and calculates the reference carbonization rate in real time. The reference carbonization rate is determined by formula (1): (m2-m1) / m1×100%=Baseline carbonization rate (1) Where: m1 is the mass of the contents of the reference carbonized slurry bottle before passing CO2, measured by the mass sensor at the bottom of the reference carbonized slurry bottle, g; m2 is the mass of the contents of the reference carbonized slurry bottle after passing CO2, which is measured in real time by the mass sensor at the bottom of the reference carbonized slurry bottle, g; When the reference carbonization rate reaches 20% to 30%, the controller automatically controls the closing of the ventilation valve of the reference CO2 gas cylinder to stop ventilation, and records the CO2 consumption Q1 at this time; pauses stirring, reads the mass m3 of the contents of the reference carbonization slurry bottle at this time, and prepares to enter the CO2 dosage fine-tuning process; The process of fine-tuning CO2 dosage is as follows: Prepare cement slurry with the same expected consistency in the reference slurry bottle as a reference. Its mass is the same as that of the content in the reference carbonized slurry bottle, both of which are m3. The controller controls to open the stirring blades of the reference slurry bottle and the reference carbonized slurry bottle and adjust the speed to be consistent. The controller controls to open the ventilation valve of the reference CO2 gas bottle and ventilate at a speed of 350-600mL / min. The resistance sensor on the stirring blade collects the resistance change data in real time and transmits it to the controller. The controller calculates the reference consistency increase rate in real time: (f2-f1) / f1×100%=base consistency increase rate (2) Where: f1 is the stirring blade resistance of the reference carbonization slurry bottle measured in real time after continuous CO2 introduction during the fine adjustment of CO2 dosage, N; f2 is the stirring blade resistance of the reference slurry bottle, N, which is a constant value; When the base viscosity increase rate reaches 5% of the base value of the viscosity increase rate, reduce the CO2 ventilation rate to 1 / 3 to 1 / 2 of the previous rate and continue ventilation until the viscosity increase rate reaches the base value of the viscosity increase rate, which is 20% to 30%; The controller automatically disconnects the ventilation and records the amount of CO2 used in this stage, Q2; The amount of carbon dioxide required to carbonize 100 g of calcium or magnesium-containing solid waste powder to an appropriate degree is Q1+Q2.

8. The method for producing solid waste-based foamed lightweight soil by adjusting consistency by carbonization according to claim 7, characterized in that: In step (2), the mixer in the mixing chamber is operated at 550-1100 r / min. -1 Stir at a speed of 5 minutes until the pH stabilizes and the water-cement ratio is 0.35-0.

55.

9. The method for producing solid waste-based foamed lightweight soil by adjusting consistency by carbonization according to claim 7, characterized in that: In step (3), the temperature was 1.2-1.5 L min. -1 CO2 is introduced into the slurry at a flow rate of , and the stirrer is kept stirring at a speed of 450-1050r / min during the ventilation process.

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