Method for resource utilization of household garbage incineration fly ash and experimental detection method

Abstract

The invention provides a household garbage incineration fly ash resource utilization method and an experimental detection method, relates to the technical field of household garbage treatment, and aims to solve the problems of high regeneration energy consumption of an alkaline absorbent and the like. The resource utilization method comprises the following steps: putting an alkaline solution into a container; cO2 gas is introduced into the alkaline solution, so that the alkaline solution absorbs the CO2 gas, and a CO2 absorption solution is formed; the household garbage incineration fly ash is placed in the CO2 absorption solution and reacts under the conditions of the first set temperature, the set mass ratio, the set stirring speed and the set duration; and carrying out solid-liquid separation on the reaction product, wherein the separated liquid is the alkaline solution. According to the method, the alkaline solution can be repeatedly utilized, so that the condition that the regeneration process of the alkaline absorbent needs relatively high energy consumption is avoided, and the aim of saving energy is fulfilled.

Description

Technical Field

[0001] The invention relates to the technical field of domestic waste treatment, and in particular to a method for resource utilization of fly ash from domestic waste incineration and an experimental detection method. Background Art

[0002] With the rapid development of urbanization and industrialization, a large amount of fossil fuels are burned to meet the world's energy needs, and greenhouse gas emissions are gradually increasing, which in turn triggers a series of extreme environmental problems.

[0003] There are many carbon dioxide treatment processes that aim to absorb carbon dioxide and reduce the carbon dioxide content in the air. In the traditional industrial large-scale capture of carbon dioxide alkaline solution washing technology, since the alkaline absorbent is regenerated under high temperature conditions, the regeneration process of the alkaline absorbent has high energy consumption, which is not conducive to energy conservation; and the regeneration of the alkaline absorbent under high temperature conditions will cause corrosion to the equipment, resulting in an increase in the operating cost of the equipment. Summary of the invention

[0004] The purpose of the present invention is to provide a method for resource utilization of fly ash from incineration of domestic waste and an experimental detection method, which are used to improve the problem of high regeneration energy consumption of alkaline absorbent in related technologies.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] On the one hand, the present invention provides a method for resource utilization of fly ash from incineration of domestic waste, comprising: placing an alkaline solution in a container; introducing CO into the alkaline solution; 2 gas, so that the alkaline solution absorbs the CO 2 gas and forms CO 2 Absorbing solution; placing the fly ash from the incineration of domestic waste in the CO 2 The solution is absorbed and reacted under the conditions of a first set temperature, a set mass ratio, a set stirring speed and a set time; the product after the reaction is separated into solid and liquid, and the separated liquid is the alkaline solution.

[0007] In some embodiments, the first set temperature is greater than or equal to 55°C and less than or equal to 75°C.

[0008] In some embodiments, the set duration is greater than or equal to 15 minutes and less than or equal to 40 minutes.

[0009] In some embodiments, the domestic waste incineration fly ash and the CO 2 The set mass ratio of the absorption solution is greater than or equal to 0.03 g / ml and less than or equal to 0.1 g / ml.

[0010] In some embodiments, the set stirring speed is greater than or equal to 300 rpm and less than or equal to 800 rpm.

[0011] In some embodiments, after placing the alkaline solution in the container, the method further comprises: heating the container in a water bath so that the temperature of the alkaline solution is between 32° C. and 38° C.

[0012] In some embodiments, the CO is introduced into the alkaline solution. 2 The gas comprises: introducing the CO into the alkaline solution 2 gas, and the CO 2 The gas flow rate is between 280 and 320 mL / min.

[0013] In some embodiments, the alkaline solution is an ethanolamine solution.

[0014] On the other hand, the present invention provides an experimental detection method for resource utilization of fly ash from incineration of domestic waste, the experimental detection method comprising: placing an alkaline solution in a container; introducing CO into the alkaline solution; 2 gas, so that the alkaline solution absorbs the CO 2 gas and forms CO 2 Absorbing solution; placing the fly ash from the incineration of domestic waste in the CO 2 The fly ash is absorbed in the solution and reacts under the conditions of a first set temperature, a set mass ratio, a set stirring speed and a set time; the product after the reaction is separated into solid and liquid, the separated solid is dried at a second set temperature, the separated liquid is added to the set capacity, and the operation is repeated to determine the stability of the fly ash as a regeneration agent, so as to calculate the regeneration efficiency and the mineralization effect.

[0015] Beneficial effects:

[0016] The method for resource utilization of fly ash from incineration of domestic waste is to react the fly ash from incineration of domestic waste under the conditions of a first set temperature, a set mass ratio, a set stirring speed and a set time, so that elements such as calcium (Ca) and magnesium (Mg) in the fly ash from incineration of domestic waste can react with CO 2 The absorption solution reacts fully and generates CaCO 3 and MgCO 3 and other minerals, thereby achieving CO 2 storage, which can also make CO 2 The sealed solution is reused as an alkaline solution, thereby avoiding the high energy consumption required for the regeneration process of the alkaline absorbent in the prior art, thereby achieving the purpose of energy saving. 2The alkaline solution is used for carbonation reaction, which reduces the leaching of heavy metals in fly ash and reduces environmental pollution. On the other hand, for the experimental detection method of resource utilization of fly ash from incineration of domestic waste, the use of alkaline solution to absorb carbon dioxide is more efficient, sufficient and widely adaptable; and it mainly utilizes Ca in fly ash of domestic waste. 2+ Mg 2+ The carbonization reaction is carried out, and the method seeks the best reaction conditions for this process; the method obtains the best regeneration efficiency and mineralization effect under the best process conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only illustrate certain embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without paying creative work.

[0018] Figure 1 A flow chart of a method for resource utilization of fly ash from incineration of domestic waste provided in some embodiments of the present application;

[0019] Figure 2 A flow chart of an experimental detection method for resource utilization of fly ash from incineration of domestic waste provided in some embodiments of the present application;

[0020] Figure 3 For the different MSW incineration fly ash and the CO 2 A graph showing the test results of carbon sequestration efficiency at a set mass ratio of the absorption solution;

[0021] Figure 4 The graph is a test result of carbon sequestration efficiency at different set time lengths in Experimental Group 2;

[0022] Figure 5 The graph is a test result of carbon sequestration efficiency at different set temperatures in Experimental Group 3;

[0023] Figure 6 This is a graph showing the test results of carbon sequestration efficiency at different stirring speed settings in Experimental Group 4. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0027] Unless the context requires otherwise, throughout the specification and claims, the term "including" is to be interpreted as an open, inclusive meaning, that is, "including, but not limited to". In the description of the specification, the terms "some embodiments", "some examples" or "exemplary" and the like are intended to indicate that specific features, structures, materials or characteristics associated with the embodiment or example are included in at least one embodiment or example of the present invention. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials or characteristics described may be included in any one or more embodiments or examples in any appropriate manner.

[0028] In addition, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. The term "A and / or B" includes the following combinations: only A, only B, or A and B.

[0029] In the traditional industrial large-scale capture of carbon dioxide (CO 2 ) in the alkaline solution washing technology, since the alkaline absorbent is regenerated under high temperature conditions, the regeneration process of the alkaline absorbent has high energy consumption, which is not conducive to energy conservation; and the regeneration of the alkaline absorbent under high temperature conditions will cause corrosion to the equipment, which will lead to an increase in the operating cost of the equipment.

[0030] In addition, with the rapid development of urbanization and the continuous progress of the economy in my country, the annual output of urban domestic waste has gradually increased, and the capacity of landfills and garbage landfills has approached saturation. The treatment of fly ash has become an urgent problem that needs to be solved in my country. At the same time, urban domestic waste is classified as hazardous waste because it contains harmful substances such as dioxins / furans and heavy metals. It usually needs to be harmlessly treated before it can be buried in a landfill.

[0031] Based on this, some embodiments of the present application provide a method for resource utilization of fly ash from incineration of domestic waste, by which fly ash from incineration of domestic waste is utilized as a mineralizer to 2Sequestration can also be used to treat CO 2 The alkaline absorbent can be regenerated, and the alkaline absorbent regeneration process can greatly reduce energy consumption, thereby facilitating its continued recycling.

[0032] like Figure 1 As shown, the method for resource utilization of fly ash from incineration of domestic waste includes the following steps.

[0033] S101: Place an alkaline solution in a container.

[0034] In some examples, the alkaline solution may be an amine solution, which can react with CO 2 The gas is effectively absorbed.

[0035] For example, the alkaline solution can be an ethanolamine (such as MEA) solution, in which case the alkaline absorbent is ethanolamine. Of course, the solute in the alkaline solution can be the alkaline absorbent.

[0036] S102: Add CO to the alkaline solution 2 gas, so that the alkaline solution can fully absorb CO 2 gas and forms CO 2 Saturated absorption solution (hereinafter referred to as CO 2 absorption solution).

[0037] In some examples, a compressed CO 2 The valve of the gas container makes the CO 2 The gas is passed into an alkaline solution to form CO 2 In this process, CO can be reasonably controlled. 2 The gas flow rate, so that CO 2 Can be fully absorbed.

[0038] S103: placing the fly ash from the incineration of domestic waste in the CO 2 The carbonation reaction is carried out in the absorption solution under the conditions of a first set temperature, a set mass ratio, a set stirring speed and a set time.

[0039] By reacting the fly ash from the incineration of domestic waste at a first set temperature, a set mass ratio, a set stirring speed and a set time, the elements such as calcium (Ca) and magnesium (Mg) in the fly ash from the incineration of domestic waste can react with CO 2 The absorption solution reacts fully and generates CaCO 3 and MgCO 3 and other minerals, thereby achieving CO 2 of storage.

[0040] S104: performing solid-liquid separation on the product after the reaction in step S103, and the separated liquid is the alkaline solution.

[0041] Therefore, through the above method, CO 2 The sealed solution is reused as an alkaline solution, thereby avoiding the high energy consumption required for the regeneration process of the alkaline absorbent in the prior art, thereby achieving energy saving.

[0042] In some embodiments, in step S103, the fly ash from the incineration of domestic waste and CO 2 The set mass ratio of the absorption solution is greater than or equal to 0.03 g / ml and less than or equal to 0.1 g / ml.

[0043] By incinerating domestic waste fly ash and CO 2 When the mass ratio of the absorption solution is set within the above range, good carbon sequestration efficiency can be achieved.

[0044] Exemplarily, the set mass ratio can be 0.03, 0.05, 0.07, 0.09, 0.1, etc., which is not limited in this application.

[0045] For example, the mass ratio may be set to 0.03, in which case an excellent carbon sequestration efficiency can be ultimately achieved.

[0046] In some embodiments, in step S103, the first set temperature is greater than or equal to 55°C and less than or equal to 75°C.

[0047] By incinerating domestic waste fly ash and CO 2 When the reaction temperature of the absorption solution is set within the above range, good carbon sequestration efficiency can be achieved.

[0048] Illustratively, the first set temperature may be 55° C., 57° C., 63° C., 65° C., 67° C., 75° C., etc., which is not limited in the present application.

[0049] For example, the first set temperature may be 65° C., in which case an excellent carbon sequestration efficiency can be finally achieved.

[0050] In some embodiments, in step S103, the duration is set to be greater than or equal to 15 minutes and less than or equal to 40 minutes.

[0051] By incinerating domestic waste fly ash and CO 2 When the reaction time of the absorption solution is set within the above range, good carbon sequestration efficiency can be achieved.

[0052] Exemplarily, the set duration can be 15 minutes, 30 minutes, 40 minutes, etc., which is not limited in this application.

[0053] For example, the set time length may be 30 minutes, in which case an excellent carbon sequestration efficiency can be ultimately achieved.

[0054] In some embodiments, in step S103, the stirring speed is set to be greater than or equal to 300 revolutions per minute (r / min) and less than or equal to 800 revolutions per minute.

[0055] By incinerating domestic waste fly ash and CO 2 When the reaction of the absorption solution is carried out, the rotation speed of the agitator is controlled within the above range, so that a good carbon sequestration efficiency can be achieved.

[0056] Exemplarily, the stirring speed may be set to 300 r / min, 400 r / min, 500 r / min, 600 r / min, 700 r / min, 800 r / min, etc., which is not limited in the present application.

[0057] For example, the stirring speed may be set to 800 r / min, in which case an excellent carbon sequestration efficiency can be ultimately achieved.

[0058] In some embodiments, between step S101 and step S102, the method further includes:

[0059] S1011: Heat the container in a water bath so that the temperature of the alkaline solution is between 32°C and 38°C.

[0060] By heating the alkaline solution to the above appropriate temperature, CO 2 The gas can be well absorbed after passing into the alkaline solution.

[0061] For example, the alkaline solution temperature may be 35°C.

[0062] In some embodiments, step S102 includes: introducing CO into the alkaline solution. 2 Gas, and CO 2 The gas flow rate is between 280 and 320 mL / min.

[0063] By using CO 2 The gas flow rate is controlled within the above range, so that CO 2 The gas can be well absorbed after passing into the alkaline solution.

[0064] For example, CO 2 The gas flow rate can be 300 mL / min.

[0065] In some examples, CO 2The duration of the gas introduction can be controlled between 55 minutes and 65 minutes. For example, the duration of the gas introduction can be 60 minutes, so that a sufficient amount of CO can be introduced into the alkaline solution. 2 gas, thereby ensuring the subsequent 2 The gas is effectively stored as carbon.

[0066] The method for resource utilization of fly ash from incineration of domestic waste provided in the above embodiment has the advantages of low cost, good repeatability, good stability, simplicity, speed and easy operation. In addition, the "carbon dioxide absorption-mineralization-integration" process reduces the energy consumption problem of traditional thermal regeneration.

[0067] It is worth noting that due to the high calcium and magnesium content, fine particle size, and large specific surface area of ​​municipal waste fly ash, this indirectly reflects that fly ash has great potential for mineral carbonation. Among all alkaline solid wastes, this technology can not only improve the stability of fly ash, but also reduce greenhouse gas emissions and reduce the energy consumption of alkaline absorbent regeneration, thus achieving the goal of "treating waste with waste".

[0068] In addition, the method for resource utilization of fly ash from incineration of municipal solid waste provided in this application can be applied to waste incineration plants, which can not only reduce carbon dioxide emissions, but also reduce the transportation cost problem during the treatment process. 3 and MgCO 3 The thermal stability is extremely high and it is wrapped on the fly ash surface, reducing the leaching of heavy metals in the fly ash.

[0069] The present application also provides an experimental detection method for resource utilization of fly ash from incineration of domestic waste, such as Figure 2 As shown, the experimental detection method includes the following steps.

[0070] S201: placing an alkaline solution in a container.

[0071] S202: introducing CO into the alkaline solution 2 gas, so that the alkaline solution fully absorbs the CO 2 gas and forms CO 2 Saturated absorption solution (hereinafter referred to as CO 2 absorption solution).

[0072] S203: placing the fly ash from the incineration of domestic waste in the CO 2 The carbonation reaction is carried out in the absorption solution under the conditions of a first set temperature, a set mass ratio, a set stirring speed and a set time.

[0073] S204: The product after the reaction in step S203 is separated into solid and liquid, the separated solid is dried at a second set temperature, the separated liquid is added to a set capacity, and the operation is repeated to determine the stability of the fly ash as a regeneration agent, so as to calculate the regeneration efficiency and the mineralization effect.

[0074] Among them, steps S201-S203 can be set with reference to steps S101-S103 in the above-mentioned method for resource utilization of fly ash from incineration of domestic waste, and will not be described in detail here.

[0075] For step S204, the filter residue after solid-liquid separation is the product after carbon sequestration. The separated solid is dried at a second set temperature, and then the filter residue can be ground for thermogravimetric analysis (TGA).

[0076] The second set temperature may be between 100° C. and 110° C. For example, it may be dried at 105° C. for 6 hours, and then ground and used for thermogravimetric analysis.

[0077] Through the above experimental detection method, the final carbon sequestration efficiency under different first set temperature, set mass ratio, set stirring speed and set time conditions can be measured, and then the first set temperature, set mass ratio, set stirring speed and set time conditions can be determined according to actual conditions to achieve a good carbon sequestration effect. Therefore, the experimental detection method can be used to determine the data in the method for resource utilization of fly ash from incineration of domestic waste, so that the method for resource utilization of fly ash from incineration of domestic waste under the data can achieve a good carbon sequestration effect.

[0078] Based on the above experimental detection method for resource utilization of fly ash from incineration of domestic waste, the inventors made the following experimental group to determine the best combination of fly ash from incineration of domestic waste and the CO 2 Parameters such as the set mass ratio of the absorption solution, the first set temperature, the set stirring speed and the set time.

[0079] Experimental Group 1

[0080] (1) Take 100 mL of 2 mol / L ethanolamine solution in a three-necked flask and heat it in a water bath in a heat-collecting constant temperature heating magnetic stirrer.

[0081] (2) After heating in a water bath to 35°C, turn on the CO 2 Cylinder, control the gas flow rate at 300mL min -1 The flow rate of CO 2 The gas was introduced into the bubbling bottle to start the reaction, and the absorption time was controlled to be 60 min.

[0082] (3) After the absorption reaction is completed, the municipal waste incineration fly ash is placed in a CO2-rich 2 The alkaline absorbent (i.e., ethanolamine) in the absorption solution is mineralized and regenerated, and the reaction is carried out for 60 minutes at a reaction temperature of 45°C and a rotation speed of 300r / min; wherein the fly ash from the incineration of domestic waste is reacted with the CO 2 The mass ratio of the absorption solution was set to 6 control groups: 0.03 g / ml, 0.05 g / ml, 0.1 g / ml, 0.15 g / ml, 0.3 g / ml and 0.5 g / ml.

[0083] (4) The product after the reaction was filtered and after solid-liquid separation, the filter residue was dried at 105°C for 6 h and then ground for thermogravimetric analysis (TGA). The filtrate was made up to 100 ml and the operation was repeated to determine the stability of fly ash as a regeneration agent, so as to calculate the regeneration efficiency and mineralization effect.

[0084] like Figure 3 As shown, the carbon sequestration efficiency under different mass ratios was obtained through experimental group 1. Among them, when the mass ratio was 0.05g / ml, the carbon sequestration efficiency was the highest, and when the mass ratio was 0.5g / ml, the carbon sequestration efficiency was the lowest, and as the mass ratio increased, the carbon sequestration efficiency gradually decreased. When the mass ratio was greater than or equal to 0.03g / ml and less than or equal to 0.1g / ml, the carbon sequestration efficiency could be maintained at a relatively high level.

[0085] Moreover, when the mass ratio is set to 0.05, the carbon sequestration effect is optimal.

[0086] Experimental Group 2

[0087] (1) Take 100 mL of 2 mol / L ethanolamine solution in a three-necked flask and heat it in a water bath in a heat-collecting constant temperature heating magnetic stirrer.

[0088] (2) After heating in a water bath to 35°C, turn on the CO 2 Cylinder, control the gas flow rate at 300mL min -1 The flow rate of CO 2 The gas was introduced into the bubbling bottle to start the reaction, and the absorption time was controlled to be 60 min.

[0089] (3) After the absorption reaction is completed, the municipal waste incineration fly ash is placed in a CO2-rich 2 The alkaline absorbent (i.e., ethanolamine) is mineralized and regenerated in the absorption solution, and at a reaction temperature of 45°C, the fly ash from the incineration of domestic waste and the CO 2The reaction was carried out under the conditions of the mass ratio of the absorption solution being set to 0.1 g / ml and the rotation speed being 300 r / min; wherein, the set time (hereinafter referred to as the reaction time for the sake of convenience) was set to 6 control groups including 5 minutes, 15 minutes, 30 minutes, 40 minutes, 45 minutes and 60 minutes.

[0090] (4) The product after the reaction was filtered and after solid-liquid separation, the filter residue was dried at 105°C for 6 h and then ground for thermogravimetric analysis (TGA). The filtrate was made up to 100 ml and the operation was repeated to determine the stability of fly ash as a regeneration agent, so as to calculate the regeneration efficiency and mineralization effect.

[0091] like Figure 4 As shown, the carbon sequestration efficiency under different reaction times was obtained through experimental group 2. Among them, when the reaction time is between 15 minutes and 40 minutes, the carbon sequestration efficiency is relatively high; and in the range of 5 minutes to 30 minutes, as the reaction time increases, the carbon sequestration efficiency gradually increases, and in the range of 30 minutes to 60 minutes, as the reaction time increases, the carbon sequestration efficiency gradually decreases.

[0092] Therefore, when the reaction time is greater than or equal to 15 minutes and less than or equal to 40 minutes, the carbon sequestration efficiency can be maintained at a relatively high level. Moreover, when the reaction time is 30 minutes, the carbon sequestration effect is optimal.

[0093] Experimental Group 3

[0094] (1) Take 100 mL of 2 mol / L ethanolamine solution in a three-necked flask and heat it in a water bath in a heat-collecting constant temperature heating magnetic stirrer.

[0095] (2) After heating in a water bath to 35°C, turn on the CO 2 Cylinder, control the gas flow rate at 300mL min -1 The flow rate of CO 2 The gas was introduced into the bubbling bottle to start the reaction, and the absorption time was controlled to be 60 min.

[0096] (3) After the absorption reaction is completed, the municipal waste incineration fly ash is placed in a CO2-rich 2 The alkaline absorbent (i.e., ethanolamine) is mineralized and regenerated in the absorption solution, and the fly ash from the incineration of domestic waste is mixed with the CO 2 The reaction was carried out for 60 minutes under the conditions of a mass ratio of the absorption solution of 0.1g / ml and a rotation speed of 300r / min; wherein the first set temperature (hereinafter referred to as the reaction temperature for the sake of convenience) was set to 6 control groups of 35°C, 45°C, 55°C, 65°C, 75°C and 85°C.

[0097] (4) The product after the reaction was filtered and after solid-liquid separation, the filter residue was dried at 105°C for 6 h and then ground for thermogravimetric analysis (TGA). The filtrate was made up to 100 ml and the operation was repeated to determine the stability of fly ash as a regeneration agent, so as to calculate the regeneration efficiency and mineralization effect.

[0098] like Figure 5 As shown, the carbon sequestration efficiency at different reaction temperatures was obtained through experimental group 3. Among them, when the reaction temperature is 65°C, the carbon sequestration efficiency is the highest, and in the range of reaction temperature from 45°C to 65°C, as the reaction temperature increases, the carbon sequestration efficiency gradually increases, and in the range of reaction temperature from 65°C to 85°C, as the reaction temperature increases, the carbon sequestration efficiency gradually decreases.

[0099] Therefore, when the reaction temperature is greater than or equal to 55° C. and less than or equal to 75° C., the carbon sequestration efficiency can be maintained at a relatively high level. Moreover, when the reaction temperature is 65° C., the carbon sequestration effect is optimal.

[0100] Experimental Group 4

[0101] (1) Take 100 mL of 2 mol / L ethanolamine solution in a three-necked flask and heat it in a water bath in a heat-collecting constant temperature heating magnetic stirrer.

[0102] (2) After heating in a water bath to 35°C, turn on the CO 2 Cylinder, control the gas flow rate at 300mL min -1 The flow rate of CO 2 The gas was introduced into the bubbling bottle to start the reaction, and the absorption time was controlled to be 60 min.

[0103] (3) After the absorption reaction is completed, the municipal waste incineration fly ash is placed in a CO2-rich 2 The alkaline absorbent (i.e., ethanolamine) is mineralized and regenerated in the absorption solution, and the fly ash from the incineration of domestic waste is mixed with the CO 2 The mass ratio of the absorption solution was 0.1 g / ml and the reaction temperature was 45°C for 60 minutes. Among them, the stirring speeds were set to 300 r / min, 400 r / min, 500 r / min, 600 r / min and 800 r / min for the five control groups.

[0104] (4) The product after the reaction was filtered and after solid-liquid separation, the filter residue was dried at 105°C for 6 h and then ground for thermogravimetric analysis (TGA). The filtrate was made up to 100 ml and the operation was repeated to determine the stability of fly ash as a regeneration agent, so as to calculate the regeneration efficiency and mineralization effect.

[0105] like Figure 6As shown, the carbon sequestration efficiency under different set stirring speeds was obtained through experimental group 4. Among them, when the stirring speed was set to 800r / min, the carbon sequestration efficiency was the highest, and as the set stirring speed increased, the carbon sequestration efficiency almost gradually increased.

[0106] Therefore, when the stirring speed is set to 800r / min, the carbon sequestration effect is optimal.

[0107] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be thought of by any person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for resource utilization of fly ash from incineration of domestic waste, characterized in that: include: Place alkaline solution in a container; Passing CO2 gas into the alkaline solution so that the alkaline solution absorbs the CO2 gas and forms a CO2 absorbing solution; Placing the fly ash from the incineration of domestic waste in the CO2 absorption solution and reacting the solution under the conditions of a first set temperature, a set mass ratio, a set stirring speed and a set time; The product after the reaction is subjected to solid-liquid separation, and the separated liquid is the alkaline solution.

2. The method for resource utilization of fly ash from incineration of domestic waste according to claim 1, characterized in that: The first set temperature is greater than or equal to 55° C. and less than or equal to 75° C.

3. The method for resource utilization of fly ash from incineration of domestic waste according to claim 1, characterized in that: The set duration is greater than or equal to 15 minutes and less than or equal to 40 minutes.

4. The method for resource utilization of fly ash from incineration of domestic waste according to claim 1, characterized in that: The set mass ratio of the domestic waste incineration fly ash to the CO2 absorption solution is greater than or equal to 0.03 g / ml and less than or equal to 0.1 g / ml.

5. The method for resource utilization of fly ash from incineration of domestic waste according to claim 1, characterized in that: The set stirring speed is greater than or equal to 300 rpm and less than or equal to 800 rpm.

6. The method for resource utilization of fly ash from incineration of domestic waste according to any one of claims 1 to 5, characterized in that: After placing the alkaline solution in the container, the method further comprises: heating the container in a water bath so that the temperature of the alkaline solution is between 32° C. and 38° C.

7. The method for resource utilization of fly ash from incineration of domestic waste according to any one of claims 1 to 5, characterized in that: The step of introducing the CO2 gas into the alkaline solution includes: introducing the CO2 gas into the alkaline solution, and the flow rate of the CO2 gas is between 280 and 320 mL / min.

8. The method for resource utilization of fly ash from incineration of domestic waste according to any one of claims 1 to 5, characterized in that: The alkaline solution is an ethanolamine solution.

9. An experimental detection method for resource utilization of fly ash from incineration of domestic waste, the characteristics of which include: Place alkaline solution in a container; Passing CO2 gas into the alkaline solution so that the alkaline solution absorbs the CO2 gas and forms a CO2 absorbing solution; Placing the fly ash from the incineration of domestic waste in the CO2 absorption solution and reacting the solution under the conditions of a first set temperature, a set mass ratio, a set stirring speed and a set time; The product after the reaction is separated into solid and liquid, the separated solid is dried at a second set temperature, the separated liquid is added to the set capacity, and the operation is repeated to determine the stability of fly ash as a regeneration agent, so as to calculate the regeneration efficiency and mineralization effect.

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