Method and system for storing carbon dioxide in industrial waste suspension

Abstract

The present invention relates to a method and system for storing carbon dioxide in an industrial waste suspension. The method comprises the following method steps: a. Providing a collection container (2) containing an industrial waste suspension (1); b. Supplying a carbon dioxide-containing gas (9) having a volumetric flow rate into the industrial waste suspension (1) such that the industrial waste suspension is enriched with carbon dioxide, at least part of the carbon dioxide being mineralized in the industrial waste suspending agent; c, determining the loss amount of carbon dioxide in the carbon dioxide-enriched industrial waste suspension; and d, determining the amount of mineralized carbon dioxide according to the amount of supplied carbon dioxide and the loss amount of carbon dioxide.

Description

Field of the Invention

[0001] The present invention relates to a method and system for storing carbon dioxide in industrial waste suspensions. Background of the Invention

[0003] Under the Paris Agreement, the signatory parties have agreed to limit the increase in the global average temperature to below 2°C and strive to keep it at 1.5°C. This means that greenhouse gas emissions should be reduced to net zero by 2050. To achieve this goal, storage solutions are needed for the inevitable carbon dioxide emissions from industrial processes. Therefore, the storage options should have the capacity to store more than 10 billion tons (10 Gt) of carbon dioxide per year globally by 2050. Summary of the Invention

[0004] The present invention aims to develop industrial waste suspensions as carbon dioxide storage media. Typical industrial waste suspensions are water-based. Examples of industrial waste suspensions include sludge generated from cleaning concrete mixing plants or cleaning sand and / or gravel. Another example of an industrial waste suspension is slag from iron or steel production (such as blast furnace slag, electric arc furnace slag, and / or basic oxygen furnace slag). It can also be sludge or slag containing ash (such as municipal solid waste incineration ash, sewage sludge ash, wood ash, paper incineration ash, and / or coal ash). In addition, sludge or slag containing dust (such as cement bypass dust and / or cement kiln dust) can be used.

[0005] The present invention relates to a method for storing carbon dioxide in an industrial waste suspension. The method comprises the following method steps: a) providing a collection container containing an industrial waste suspension; b) supplying a gas containing carbon dioxide (hereinafter also referred to as "supply gas") having a certain volumetric flow rate into the industrial waste suspension such that the industrial waste suspension is enriched with carbon dioxide (i.e., an industrial waste suspension enriched with carbon dioxide is formed). Thereby, at least a portion of the carbon dioxide is mineralized in the industrial waste suspension (i.e., an industrial waste suspension containing mineralized carbon dioxide is formed); c) determining the amount of carbon dioxide loss in the industrial waste suspension enriched with carbon dioxide; d) determining the amount of mineralized carbon dioxide based on the amount of carbon dioxide supplied by the gas (containing carbon dioxide) having the said volumetric flow rate and the amount of carbon dioxide loss. Thereby, method steps b and c, in particular b to d, can be carried out continuously or repeatedly. The method is carried out continuously or repeatedly until a termination criterion is reached.

[0006] The industrial waste suspension preferably has an initial pH value so that carbon dioxide can be mineralized. In some embodiments, the initial pH value can be greater than 6. However, preferably, the initial pH value is greater than 9, more preferably greater than 12. According to the present application, the industrial waste suspension can be, for example, concrete wash water.

[0007] In some embodiments, the industrial waste suspension comprises an aqueous solution and solid cement minerals, or the industrial waste suspension consists of an aqueous solution and solid cement minerals. Thus, the water in the aqueous solution can be in phase equilibrium with the solid cement minerals. In some embodiments, the industrial waste suspension may contain calcium ions, which are at least partially dissolved in the aqueous solution.

[0008] In the context of the present application, carbon dioxide mineralization should be understood to mean that carbon dioxide undergoes a chemical reaction such that the carbon dioxide is mineralized. For example, by reacting with the cement minerals and / or hydroxide ions suspended in the industrial waste suspension. The mineralization of carbon dioxide results in the formation of carbonate- and / or bicarbonate-containing precipitates. The precipitate preferably contains calcium, particularly at least partially calcium carbonate. Due to the precipitation of calcium carbonate, the aqueous solution of the industrial waste suspension becomes undersaturated, leading to more calcium ions dissolving in the aqueous solution (until the saturation limit is reached again). The newly dissolved calcium ions further allow for the mineralization of additional carbon dioxide. Thus, in order to store as much carbon dioxide as possible in the industrial waste suspension, mineralization needs to be carried out in a continuous or repetitive manner until no more calcium ions dissolve.

[0009] According to the present application, determining the amount of carbon dioxide loss may include monitoring the excess gas emitted from the industrial waste suspension enriched with carbon dioxide. It should be understood that monitoring the excess gas can also be understood as monitoring whether excess gas is emitted. If no excess gas is emitted, then the amount of carbon dioxide loss (at this time) is zero. Monitoring the excess gas may include measuring the carbon dioxide concentration in the excess gas and / or measuring the volumetric flow rate of the excess gas. Based on these two measurements, the amount of carbon dioxide loss (i.e., the amount of unmineralized carbon dioxide) can be determined. However, both of these measurements may be zero, resulting in a zero amount of carbon dioxide loss. If the supply gas contains 100% carbon dioxide, then measuring the volumetric flow rate of the excess gas may be sufficient. According to the present application, the method may include separating the emitted excess gas from the industrial waste suspension containing mineralized carbon dioxide and returning it to the storage tank providing the supply gas.

[0010] As described above, at least during a specific period of implementing the method, the amount of carbon dioxide loss may be zero. This is because only a limited amount of carbon dioxide can be mineralized by the industrial waste suspension, and if the limited amount is reached, excessive gas may be emitted from the industrial waste suspension. In addition, the mineralization of carbon dioxide is not linear over time: the mineralization rate (the amount of carbon dioxide mineralized per time step) decreases as more carbon dioxide is mineralized. The mineralization rate also depends on the specific composition of the industrial waste suspension. Therefore, if the mineralization rate of carbon dioxide is exceeded (at any point in time), excessive gas may also be emitted from the industrial waste suspension. Since the (total) amount of mineralizable carbon dioxide depends on the specific composition of the industrial waste suspension, the exact value of the maximum mineralization rate (at any point in time) and the amount of mineralizable carbon dioxide are generally unknown before or during the implementation of the method.

[0011] To provide an economical and efficient process, the method can be controlled so that the industrial waste suspension only inputs the carbon dioxide that it can mineralize. To avoid over-supplying the industrial waste suspension and thus supplying more carbon dioxide than it can mineralize, the method may include controlling, by a control unit, the volumetric flow rate of the gas containing carbon dioxide (the volumetric flow rate of the supplied gas) and / or the volumetric flow rate of the industrial waste suspension. Advantageously, the control unit can actively control the corresponding volumetric flow rate according to the amount of carbon dioxide loss. For example, if the amount of carbon dioxide loss is detected, the control unit can reduce the volumetric flow rate of the supplied gas until only the amount of supplied gas that can be mineralized is input into the industrial waste suspension with the said volumetric flow rate.

[0012] To quantify the amount of mineralized carbon dioxide, the amount of carbon dioxide loss (i.e., the amount of unmineralized carbon dioxide) can be subtracted from the amount of carbon dioxide supplied from the (supplied) gas containing carbon dioxide with a certain volumetric flow rate. To determine the amount of supplied carbon dioxide, the method may include measuring the carbon dioxide concentration of the supplied gas containing carbon dioxide with a certain volumetric flow rate by a concentration sensor, and / or measuring the volumetric flow rate of the supplied gas containing carbon dioxide by a flow meter. If the carbon dioxide concentration in the supplied gas is 100%, the amount of supplied carbon dioxide can be calculated by only measuring the volumetric flow rate of the supplied gas.

[0013] However, in addition to carbon dioxide, the gas containing carbon dioxide with a certain volumetric flow rate may further include gaseous water and / or nitrogen and / or oxygen and / or methane. The supply gas may be stored in a storage tank in liquid and / or gaseous form before being supplied to the industrial waste suspension. Advantageously, the gas comprises 95% to 100% carbon dioxide. According to the present application, the gas may include renewable carbon dioxide. Renewable carbon dioxide is understood to mean biogenic carbon dioxide or carbon dioxide extracted from the atmosphere. The advantage of biogenic carbon dioxide is that it can usually be obtained in a pure form without the need for treatment. For example, biogenic carbon dioxide can be obtained as a by-product of biogas production or from the combustion of biomass (biological materials containing carbon, hydrogen, and oxygen). Alternatively, the gas may also be an exhaust gas containing 10-25% carbon dioxide. For example, the exhaust gas from a cement plant can be used.

[0014] For an easily controllable system, it is advantageous that the mineralization reaction is not carried out in a large collection container, but in an industrial waste suspension with a (determined) volumetric flow rate outside the collection container. Thus, the industrial waste suspension with a certain volumetric flow rate can be guided through a bypass (returning to the collection container in a cyclic manner starting from the collection container). Therefore, the method may include the following method steps: Extracting an industrial waste suspension with a certain volumetric flow rate from the collection container. Supplying the gas containing carbon dioxide with the said volumetric flow rate to the industrial waste suspension with the said volumetric flow rate outside the collection container (improved step b), wherein at least part of the carbon dioxide is mineralized in the industrial waste suspension. Returning the industrial waste suspension containing mineralized carbon dioxide to the collection container. These steps may be carried out continuously or in a repetitive manner, especially in conjunction with the above method step c) (or method steps c) and d)). If the industrial waste suspension has been completely enriched with the gas containing carbon dioxide once, the mineralization can be repeated (for example, until no more calcium ions dissolve or a termination condition is reached).

[0015] According to the present application, the control unit can control the volumetric flow rate of the industrial waste suspension, especially through active control. Thus, the control unit can be interconnected with a pump for pumping the industrial waste suspension through the bypass. Therefore, in order not to supply the industrial waste suspension in excess, thus supplying more carbon dioxide than can be mineralized, if the loss amount of carbon dioxide is detected, the control unit can reduce the volumetric flow rate of the gas containing carbon dioxide and / or the volumetric flow rate of the industrial waste suspension.

[0016] According to the present application, the method may include the method step of transferring the industrial waste suspension enriched with carbon dioxide to an intermediate container, in which the excess gas discharged is separated / separable from the industrial waste suspension containing mineralized carbon dioxide, and returning the industrial waste suspension containing mineralized carbon dioxide to the collection container.

[0017] The intermediate container provides the advantage of facilitating a feedback signal for controlling the volumetric flow rate of the gas containing carbon dioxide and / or the volumetric flow rate of the industrial waste suspension based on the amount of carbon dioxide loss. If no excess gas is discharged, the liquid level of the industrial waste suspension in the intermediate container will remain constant. In the context of the present application, constant is understood to be within the range of + / - 15 mm. If excess gas is discharged, i.e., separated from the industrial waste suspension containing mineralized carbon dioxide, the liquid level of the industrial waste suspension in the intermediate container will drop. Therefore, the liquid level of the industrial waste suspension in the intermediate container is a measure of carbon dioxide loss. The same applies to the hydrostatic pressure of the industrial waste suspension in the intermediate container. Accordingly, the method may include controlling the volumetric flow rate of the gas containing carbon dioxide in such a way that the liquid level of the industrial waste suspension (containing mineralized carbon dioxide) in the intermediate container remains constant. Accordingly, the method may include a level sensor for determining the liquid level of the industrial waste suspension in the intermediate container. The level sensor may be, for example, an optical sensor such as a laser or infrared sensor. Alternatively, a pressure sensor may be used at a specified location within the intermediate container, whereby the hydrostatic pressure can be used as a measure of carbon dioxide loss. Therefore, if the liquid level and / or hydrostatic pressure of the industrial waste suspension (containing mineralized carbon dioxide) in the intermediate container drops, the control unit may reduce the amount of the gas containing carbon dioxide supplied (i.e., the volumetric flow rate of the gas containing carbon dioxide) and / or reduce the volumetric flow rate of the industrial waste suspension.

[0018] According to the present application, the method may include stirring the industrial waste suspension enriched with carbon dioxide to enhance the mineralization of carbon dioxide. If an intermediate container is used, it is advantageously stirred upstream of the intermediate container. A suitably shaped / coiled pipe section (in a bypass) can achieve stirring, and / or a stirring element located in the bypass can also achieve stirring. The stirring element located in the bypass is preferably static (such as ribs or fins).

[0019] During the carbonation process of carbon dioxide in industrial waste suspensions, the alkalinity of the industrial waste suspension (containing carbonated carbon dioxide) decreases, i.e., the pH value decreases. Since the carbonation rate decreases over time, it may be economically inefficient to perform the method until all the supplied gas is discharged again as excess gas and no more carbon dioxide can be carbonated. As the carbonation rate decreases, the pH value also decreases. Therefore, an easily measurable and detectable termination criterion is the pH value of the industrial waste suspension. Thus, the method may include terminating when the industrial waste suspension reaches a predetermined pH value. Wherein, the predetermined pH value should be less than the initial pH value. In some embodiments, the method may be terminated if the predetermined pH value reaches between 7 and 10, particularly between 8.5 and 9.5. According to the present application, the pH value of the industrial waste suspension can be measured in a collection container. If a bypass is used, the pH value can be measured in the bypass before the gas containing carbon dioxide is fed into the industrial waste suspension. Optionally or additionally, the method may include terminating when the carbonated carbon dioxide per unit time or per cubic meter of industrial waste suspension reaches a predetermined value. For example, if the carbonated carbon dioxide per cubic meter reaches 0.3 - 2 kg, the method may be terminated. Or, if carbon dioxide at 2000 - 5000 ppm (which is equivalent to 0.2% - 0.5% carbon dioxide in the air) is detected in the air above the collection container or intermediate container, the method may also be terminated.

[0020] The present invention also relates to a system (also referred to as a device) for storing carbon dioxide in an industrial waste suspension. The system preferably can perform the above method for storing carbon dioxide in an industrial waste suspension.

[0021] Therefore, the system includes a collection container for the industrial waste suspension, the collection container having at least one opening for filling and / or extracting the industrial waste suspension, and an intake valve interconnected with a storage tank of the gas containing carbon dioxide. The intake valve is used to supply a certain volume flow rate of the gas containing carbon dioxide into the industrial waste suspension. In addition, the system includes at least one sensor for determining the amount of carbon dioxide loss, and a control unit interconnected with the at least one sensor for monitoring the amount of carbon dioxide loss and for determining the amount of carbonated carbon dioxide based on the supplied amount of carbon dioxide and the amount of carbon dioxide loss. Preferably, the at least one sensor is a carbon dioxide concentration sensor. In addition, there may be at least one sensor and it is interconnected to the control unit to monitor the termination criterion.

[0022] According to the present application, the system may include a bypass for circulating an industrial waste suspension having a certain volumetric flow rate from the gas outlet of the collection container to the inlet of the collection container. Thus, the bypass may include a pipe. Thereby, an intake valve (for a gas containing carbon dioxide) is arranged such that the gas containing carbon dioxide (at the supply position) is fed into the industrial waste suspension having a certain volumetric flow rate between the outlet and the inlet of the bypass. Advantageously, the bypass further includes an intermediate container. Preferably, the intermediate container is arranged downstream of the intake valve. The intermediate container is used for separating excess carbon dioxide discharged from the industrial waste suspension containing mineralized carbon dioxide. Preferably, the intermediate container is a riser pipe. The industrial waste suspension containing mineralized carbon dioxide is guided back from the intermediate container to the collection container. Another feedback pipe may be arranged between the intermediate container and a storage tank for storing the separated excess gas containing carbon dioxide. In order to achieve good mineralization, a stirring element may be arranged between the supply position (where the gas containing carbon dioxide is fed into the industrial waste suspension) and the intermediate container to stir the industrial waste suspension enriched with carbon dioxide.

[0023] According to the present application, the system may include a concentration sensor for measuring the concentration of carbon dioxide in the supplied gas containing carbon dioxide and / or a flow meter for measuring the volumetric flow rate of the supplied gas containing carbon dioxide. The concentration sensor and / or the flow meter are thereby interconnected with a control unit such that the control unit can determine the amount of mineralized carbon dioxide and the amount of carbon dioxide loss from the supplied carbon dioxide.

[0024] According to the present application, at least one sensor for determining the amount of carbon dioxide loss is arranged in the intermediate container and / or the collection container. In addition, in order to avoid over-supplying carbon dioxide to the industrial waste suspension as described above, a level sensor for measuring the level of the industrial waste suspension in the intermediate container and / or a pressure sensor for measuring the hydrostatic pressure in the intermediate container may be arranged in the intermediate container.

[0025] It should be understood that the above general description and the following detailed description both present embodiments and are intended to provide an overview or framework for understanding the nature and characteristics of the present disclosure. The previously described embodiments of the method simultaneously disclose embodiments of the corresponding design of the system for implementing the method, and vice versa. Drawings are included to provide further understanding and are incorporated into and constitute a part of this specification. The drawings illustrate various embodiments and, together with the description, are used to explain the principles of the disclosed concepts and their operation. Description of the Drawings

[0026] The present invention will be more fully understood from the following detailed description and the accompanying drawings. However, these description and drawings should not be regarded as limiting the invention described in the appended claims. The accompanying drawings illustrate the following:

[0027] Figure 1 : A flowchart of a method for storing carbon dioxide in an industrial waste suspension;

[0028] Figure 2 : According to Figure 1 A flowchart of the method shown, including further optional method steps;

[0029] Figure 3 : A schematic diagram of an example system for performing the method described in the present invention. Detailed Description of the Invention

[0030] Certain embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings, which show some but not all of the features. In fact, the embodiments disclosed herein may be implemented in many different forms and should not be construed as limited to the embodiments described herein; rather, these embodiments are provided so that this disclosure will satisfy applicable legal requirements. Whenever possible, the same reference numerals will be used to denote the same components or parts.

[0031] Figure 1 A flowchart of a method including the following steps is shown: a) providing a collection container containing an industrial waste suspension; b) supplying a gas containing carbon dioxide having a certain volumetric flow rate to the industrial waste suspension. The industrial waste suspension is thus enriched with carbon dioxide, wherein at least part of the carbon dioxide is mineralized in the industrial waste suspension; c) determining the amount of carbon dioxide loss in the industrial waste suspension enriched with carbon dioxide; d) determining the amount of mineralized carbon dioxide based on the amount of supplied carbon dioxide and the amount of carbon dioxide loss. Thus, method steps b) and c), in particular b) to d), are performed in a continuous or repetitive manner, as indicated by the arrow on the left side of the flowchart pointing to step b).

[0032] Although steps b) and / or c) may be performed in the collection container, for the purpose of improving process efficiency, it is preferred to perform the said / these steps outside the collection container. Such a variation of the method according to the present invention is as shown in Figure 2 Here, an industrial waste suspension having a certain volumetric flow rate is extracted from the collection container before supplying a gas containing carbon dioxide having the said volumetric flow rate to the industrial waste suspension having the said volumetric flow rate. After supplying the gas containing carbon dioxide having the said volumetric flow rate, the industrial waste suspension containing mineralized carbon dioxide is returned to the collection container.

[0033] Figure 3Shows a schematic diagram of a system / device for storing carbon dioxide in an industrial waste suspension, in particular for performing the method according to the present invention as described above. As shown, a collection container 2 containing an industrial waste suspension 1 is provided. The collection container 2 has an opening (inlet) 3 for filling the industrial waste suspension 1 into the collection container. For example, the inlet 3 can be interconnected with a concrete mixing plant. The collection container 2 also has an opening (outlet) 4 for extracting the industrial waste suspension 1 from the collection container 2, for example, for further processing or recycling the industrial waste suspension 1 after the termination of the above method. In the shown system, the industrial waste suspension 1 with a certain volume flow rate is introduced in a circulating manner through a bypass 8. The industrial waste suspension with a certain volume flow rate is transported through the bypass 8 by a pump 7. Thus, the industrial waste suspension 1 is drawn out of the collection container 2 through the gas outlet 6 and enters the bypass 8. Downstream of the gas outlet 8, an intake valve 22 interconnected with a storage tank 15 containing a carbon dioxide-containing gas 9 is provided for supplying the carbon dioxide-containing gas 9 with a certain volume flow rate into the industrial waste suspension 1 with a certain volume flow rate, thereby producing an industrial waste suspension 10 enriched with carbon dioxide. In the bypass 8 downstream of the intake valve 22, carbon dioxide is at least partially mineralized in the industrial waste suspension 1. To enhance the mineralization, a stirring element 11, such as a vortex generator or other device, is placed in the bypass 8. An intermediate container 12 is arranged downstream of the intake valve 22 (also downstream of the stirring element 11 if the stirring element 11 is present). In the intermediate container 12, the excess gas 14 containing carbon dioxide is separated from the industrial waste suspension 13 containing mineralized carbon dioxide. From here, the industrial waste suspension 13 containing mineralized carbon dioxide is returned to the collection container 2 through the intake port 5. The excess gas 14 is returned to the storage tank 15 providing the carbon dioxide-containing gas 9 with a certain volume flow rate.

[0034] To determine the amount of carbon dioxide loss, the excess gas 14 can be monitored. Therefore, the system can include a concentration sensor 19 to measure the carbon dioxide concentration in the excess gas 14. As an alternative or supplement, the system can include a flow meter 18 to measure the volume flow rate of the excess gas 14. The measurement can be carried out between the intermediate container 12 and the storage tank 15. Alternatively, the measurement is carried out in the intermediate container 12. Based on these two measurement values, the amount of unmineralized carbon dioxide, i.e., the amount of carbon dioxide loss, is determined.

[0035] To determine the mineralized carbon dioxide per unit time step, the amount of carbon dioxide loss per unit time step and the amount of carbon dioxide supplied per unit time step can be measured. Accordingly, the system may include another concentration sensor for measuring the carbon dioxide concentration of the supplied carbon dioxide-containing gas 9 having a certain volume flow rate, and / or another flow meter 18 for measuring the volume flow rate of the supplied carbon dioxide-containing gas 9 having a certain volume flow rate. The measurement is performed between the storage tank 15 and the intake valve 22. In the illustrated system, the supplied gas 9 comprises 100% carbon dioxide. Accordingly, the flow meter 18 is sufficient to determine the carbon dioxide supplied per unit time step.

[0036] To provide a cost-effective process, the method controls the amount of carbon dioxide input such that the industrial waste suspension 1 only inputs the amount of carbon dioxide that it can mineralize. To avoid over-supplying the industrial waste suspension 1 such that the supplied carbon dioxide exceeds its mineralizable amount, the method may include controlling the volume flow rate of the supplied gas 9 and / or the volume flow rate of the industrial waste suspension by the control unit 16. The control unit 16 may actively control the corresponding volume flow rate as a function of the amount of carbon dioxide loss obtained from the measured value of the level of the industrial waste suspension in the intermediate container 12. Accordingly, the method may include: controlling the volume flow rate of the carbon dioxide-containing gas such that the level of the carbon dioxide-enriched industrial waste suspension in the intermediate container remains constant. Accordingly, the system may include a level sensor 20 to determine the level of the industrial waste suspension in the intermediate container 12. Alternatively, a pressure sensor that measures the hydrostatic pressure may also be used such that the hydrostatic pressure is kept constant by the active control of the control unit.

[0037] To terminate the process, several options are available. For example, when the industrial waste suspension in the collection container 2 or the bypass 8 reaches a predetermined pH value, the method may terminate. Accordingly, a pH sensor 17 may be arranged in the collection container 1 or the bypass 8. Additionally or alternatively, the method may include terminating when a predetermined value of the mineralization rate is reached. For monitoring, further sensors (such as a pH sensor or a carbon dioxide concentration sensor) may be provided in the bypass, for example, downstream of the outlet 6, in the intermediate container 12, and / or downstream of the intermediate container 12.

[0038] Reference numerals:

[0039] 1 Industrial waste suspension

[0040] 2 Collection container

[0041] 3 Inlet

[0042] 4 Outlet

[0043] 5 Intake port

[0044] 6 Gas outlet

[0045] 7 Pump

[0046] 8 Bypass

[0047] 9 Supplied gas

[0048] 10 Suspension of industrial waste enriched with carbon dioxide

[0049] 11 Stirring element

[0050] 12 Intermediate container

[0051] 13 Suspension of industrial waste containing mineralized carbon dioxide

[0052] 14 Excess gas

[0053] 15 Storage tank

[0054] 16 Control unit

[0055] 17 pH sensor

[0056] 18 Flowmeter

[0057] 19 Concentration sensor

[0058] 20 Liquid level sensor / Pressure sensor

[0059] 21 Additional sensor

[0060] 22 Inlet valve

Claims

1. A method for storing carbon dioxide in an industrial waste suspension (1), the method comprising the following method steps: a. Providing a collection container (2) containing an industrial waste suspension (1); b. Supply a gas (9) containing carbon dioxide with a certain volume flow rate to the industrial waste suspension (1) so that the industrial waste suspension (1) is enriched with carbon dioxide, wherein, At least part of the carbon dioxide is mineralized in the industrial waste suspension agent; c. Determining the amount of carbon dioxide loss in the industrial waste suspension enriched with carbon dioxide; d. Determining the amount of mineralized carbon dioxide based on the amount of supplied carbon dioxide and the amount of carbon dioxide loss.

2. The method according to claim 1, wherein, The method steps b and c of claim 1, in particular b to d, are performed in a continuous or repetitive manner.

3. The method according to any one of the preceding claims, wherein Determining the amount of carbon dioxide loss includes monitoring the excess gas (14) discharged from the industrial waste suspension (10) enriched with carbon dioxide.

4. The method according to claim 3, wherein Monitoring the excess gas (14) includes measuring the carbon dioxide concentration in the excess gas (14) and / or measuring the volumetric flow rate of the excess gas.

5. The method according to any one of the preceding claims, wherein the method comprises: - Measuring the carbon dioxide concentration of the supplied gas containing carbon dioxide with a certain volumetric flow rate by a concentration sensor (19) and / or - Measuring the volumetric flow rate of the supplied gas containing carbon dioxide with a certain volumetric flow rate by a flow meter (18) to determine the supplied carbon dioxide.

6. The method according to any one of the preceding claims, wherein, The method is terminated when the industrial waste suspension (1) in the collection container (2) reaches a predetermined pH value and / or reaches a predetermined value of mineralized carbon dioxide per unit time.

7. The method according to any one of the preceding claims, wherein Supplying a gas (9) containing carbon dioxide with a certain volumetric flow rate to the industrial waste suspension (1) includes the following method steps: - Extracting an industrial waste suspension (1) with a certain volumetric flow rate from the collection container (2); - Supplying a gas (9) containing carbon dioxide with a certain volumetric flow rate to the industrial waste suspension (1) with a certain volumetric flow rate outside the collection container (2), wherein at least part of the carbon dioxide is mineralized in the industrial waste suspension; and - Returning the industrial waste suspension (13) with mineralized carbon dioxide to the collection container (2).

8. The method according to claim 7, wherein The method includes the following method steps: transferring the industrial waste suspension enriched with carbon dioxide with a certain volumetric flow rate to an intermediate container (12), in which the discharged excess gas is separated from the industrial waste suspension (13) containing mineralized carbon dioxide, and returning the industrial waste suspension (13) containing mineralized carbon dioxide to the collection container (2).

9. The method according to claim 8, wherein, The gas (9) containing carbon dioxide with a certain volumetric flow rate is controlled in such a way that the liquid level or hydrostatic pressure of the industrial waste suspension (13) containing mineralized carbon dioxide in the intermediate container remains constant.

10. The method according to any one of the preceding claims 7 to 9, wherein, The volumetric flow rate of the gas containing carbon dioxide and / or the volumetric flow rate of the industrial waste suspension are controlled by a control unit (16), in particular actively controlled according to a functional relationship of the amount of carbon dioxide loss.

11. The method according to claim 9, wherein, The liquid level of the industrial waste suspension in the intermediate container (12) is determined by a level sensor (20) and / or a pressure sensor measuring the static pressure in the intermediate container (12).

12. The method according to any one of the preceding claims, wherein, Stir the industrial waste suspension (10) enriched with carbon dioxide to promote the mineralization of carbon dioxide.

13. The method according to claims 8 and 12, wherein, The stirring of the industrial waste suspension (10) enriched with carbon dioxide is carried out upstream of the intermediate container (12).

14. The method according to claim 8, wherein The separated excess gas (14) is returned to the storage tank (15) that provides the gas (9) containing carbon dioxide with a certain volumetric flow rate.

15. A system for storing carbon dioxide in an industrial waste suspension (1), the system comprising: a. A collection container (2) for the industrial waste suspension, having at least one opening (3, 4) for filling and / or extracting the industrial waste suspension; b. An intake valve (22) interconnected with a storage tank (15) for the gas (9) containing carbon dioxide, for supplying the gas (9) containing carbon dioxide with a certain volumetric flow rate into the industrial waste suspension (1); c. At least one sensor (17, 19, 20, 21) for determining the amount of carbon dioxide loss; d. A control unit (16) interconnected with the at least one sensor (17, 19, 20, 21), for monitoring the amount of carbon dioxide loss and determining the amount of mineralized carbon dioxide based on the supplied amount of carbon dioxide and the amount of carbon dioxide loss.

16. The system according to claim 15, wherein, The system includes a bypass (8) for supplying the industrial waste suspension (1) with a certain volumetric flow rate from the outlet (6) of the collection container (2) to the inlet (5) of the collection container (2) in a circulating manner, wherein the intake valve (22) is arranged such that the gas (9) containing carbon dioxide is fed into the industrial waste suspension (1) with a certain volumetric flow rate in the bypass (8).

17. The system according to claim 16, wherein the bypass (8) includes an intermediate container (12) located downstream of the intake valve (22).

18. The system according to claim 17, wherein A stirring element (11) is arranged between the intermediate container (12) and the intake valve (22) to mix the gas containing carbon dioxide with the carbon dioxide with a certain volumetric flow rate.

19. The system according to any one of claims 15-18, wherein, At least one sensor for determining the amount of carbon dioxide loss is arranged in the intermediate container (12) and / or the collection container (2).

20. The system according to any one of claims 15-19, wherein, A level sensor (20) for measuring the level of the industrial waste suspension in the intermediate container (12) and / or a pressure sensor (20) for measuring the hydrostatic pressure in the intermediate container (12) are arranged in the intermediate container (12).

21. The system according to any one of claims 15-20, wherein, The system includes a concentration sensor (19) for measuring the carbon dioxide concentration of the supplied gas (9) containing carbon dioxide with a certain volumetric flow rate and / or a flow meter (18) for measuring the volumetric flow rate of the supplied gas (9) containing carbon dioxide with a certain volumetric flow rate.

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