Preparation method and curing system for solid concrete blocks

Abstract

A preparation method and curing system for solid concrete blocks. The preparation method comprises the following steps: mixing bottom ash, fly ash, limestone and water, and pressing same into solid-waste-based solid blocks; and sequentially placing the solid-waste-based solid blocks into a carbon dioxide mineralization curing mechanism, first performing pre-curing in a carbon dioxide atmosphere containing steam, and then performing a mineralization treatment to obtain solid concrete blocks. By means of carbon dioxide mineralization-steam coupled progressive curing, the amounts of steam and carbon dioxide gas can be reduced, and the emissions of tail gas can be reduced; while the energy consumption is reduced, the production efficiency of carbon dioxide curing and the utilization efficiency of the carbon dioxide gas can be significantly improved, and the carbon sequestration capacity and mineralization depth of a solid concrete block product can be significantly enhanced; moreover, the phenomenon of internal layering of the solid concrete block product due to the temperature being raised too quickly can be avoided, the emissions of greenhouse gases can be reduced, and large-scale promotion can be easily implemented.

Description

Preparation method of concrete solid block and curing system TECHNICAL FIELD

[0001] The present application relates to the technical field of building materials processing, and in particular to a preparation method of a concrete solid block and a curing system. BACKGROUND

[0002] Fly ash is one of the important by-products of coal-fired power plants. Directly using fly ash to prepare solid blocks can reduce production costs and achieve resource recycling. Currently, fly ash solid blocks mainly obtain strength through self-hardening method, hydraulic method and active blending method. For example, the self-hardening method mainly uses the hydration characteristics of fly ash itself to obtain strength; the hydraulic method improves the bonding force by adding water to fly ash to generate hydration products through hydration reaction; the active blending method adds other mineral blending materials to enhance the strength of the material by using their reactivity.

[0003] With the rapid development of social economy, the demand for concrete solid blocks has increased dramatically. Directly using fly ash to prepare solid blocks as a substitute for cement solid blocks can alleviate the demand pressure. However, the solid blocks prepared by directly using fly ash in the prior art have poor mechanical properties, poor erosion resistance, uneven quality, and are difficult to meet the technical requirements of concrete solid blocks. At the same time, a large amount of furnace bottom slag and other coal-based solid wastes are generated during coal mining and utilization, which will occupy land and cause environmental pollution if directly stored. On the other hand, the exhaust gas discharged during industrial production contains a large amount of CO2, which is one of the important greenhouse gases.

[0004] Currently, the method for preparing solid blocks by treating solid waste with CO2 mainly focuses on direct mineralization technology. This method mainly generates carbonates by directly reacting CO2 with solid waste under certain temperature and pressure, and uses them to enhance the strength of solid blocks. However, this method has problems such as long reaction time, high equipment pressure resistance requirement, and complex pretreatment steps.

[0005] In view of this, the present application is proposed.

[0006] SUMMARY

[0007] The purpose of the present application is to provide a preparation method of a concrete solid block, which can significantly improve the compressive strength of the concrete solid block.

[0008] In a first aspect, the present application provides a preparation method of a concrete solid block, comprising the following steps:

[0009] The furnace bottom slag, fly ash, limestone and water are mixed and pressed into solid waste solid blocks, and the solid waste solid blocks are sequentially placed in a carbon dioxide mineralization curing mechanism, pre-cured in a carbon dioxide atmosphere containing water vapor, and then mineralized to obtain concrete solid blocks.

[0010] The preparation method of the concrete solid block mainly utilizes water vapor to cause the wet reaction of silicon oxide and aluminum oxide in the solid waste to generate silicate and aluminate hydrolysis products, and then performs mineralization reaction with carbon dioxide to generate stable carbonate minerals, thereby improving the strength of the product.

[0011] The carbon dioxide mineralization and steam coupling progressive curing can reduce the use amount of steam and carbon dioxide gas, reduce the emission of tail gas, reduce energy consumption, significantly improve the production efficiency of carbon dioxide curing and the utilization efficiency of carbon dioxide gas, and the carbon sequestration capacity and mineralization depth of the concrete solid block product, and can avoid the internal layering phenomenon of the concrete solid block product caused by rapid heating, reduce greenhouse gas emissions, and is easy to promote on a large scale.

[0012] As the preferred technical solution, in the carbon dioxide mineralization curing mechanism, the solid waste solid blocks are sequentially subjected to first-stage pre-curing treatment, second-stage mineralization treatment and third-stage heat preservation mineralization treatment, or the solid waste solid blocks are sequentially subjected to first-stage pre-curing treatment, second-stage mineralization treatment,

[0013] The first-stage pre-curing treatment is performed in a carbon dioxide atmosphere containing water vapor with a relative humidity greater than 95%, so as to utilize water vapor to cause the wet reaction of silicon oxide and aluminum oxide in the solid waste to generate silicate and aluminate hydrolysis products; the second-stage mineralization treatment is performed in a carbon dioxide atmosphere with a concentration greater than or equal to 99%, so as to cause the reaction of the silicate and aluminate hydrolysis products with carbon dioxide to generate stable carbonate minerals, thereby improving the strength of the product.

[0014] As the preferred technical solution, during the first-stage pre-curing treatment, the pressure, temperature and curing time of the present application are not strictly limited, specifically, the pressure can be controlled to be 0.5-2MPa, and preferably 1-2MPa, the temperature can be controlled to be 50-150℃, and preferably 100-150℃, the carbon dioxide concentration is greater than or equal to 30%, and the reaction time is 4-6h.

[0015] As the preferred technical solution, in the secondary mineralization treatment, a multi-stage temperature increasing and pressure increasing mode is adopted, the pressure is increased to 0.5-2 MPa at a pressure increasing rate of 0.5-1.0 MPa / h, the temperature is increased to 50-150 DEG C at a temperature increasing rate of 30-50 DEG C / h, and the reaction is performed for 4-10 h, so that the internal layering phenomenon of the concrete solid block product caused by too fast temperature increasing can be avoided, the greenhouse gas emission is reduced, and the waste heat can be fully utilized to reduce the mineralization curing cost.

[0016] As the preferred technical solution, in the secondary mineralization treatment, a multi-stage temperature increasing and pressure increasing mode is adopted, the pressure is increased to 0.5-2 MPa at a pressure increasing rate of 0.5-1.0 MPa / h, the temperature is increased to 50-150 DEG C at a temperature increasing rate of 30-50 DEG C / h, and the reaction is performed for 4-10 h, so that the internal layering phenomenon of the concrete solid block product caused by too fast temperature increasing can be avoided, the greenhouse gas emission is reduced, and the waste heat can be fully utilized to reduce the mineralization curing cost.

[0017] As the preferred technical solution, the concrete solid block comprises the following raw materials in parts by weight: fly ash 60-80 parts, furnace bottom slag 20-30 parts, limestone 5-15 parts, carbide slag 0-5 parts, and water 10-15 parts.

[0018] The present application utilizes fly ash and furnace bottom slag to replace cement to prepare solid waste solid blocks, which not only can relieve the demand pressure, but also can further utilize the reaction activity of the carbide slag to enhance the strength of the material. Research shows that, by using the raw materials of the components to press into solid waste solid blocks, and by using the curing method of the present application to perform indirect mineralization treatment, stable carbonate minerals can be generated, and the compressive strength of the product can be improved.

[0019] As the preferred technical solution, the particle size of the furnace bottom slag and the fly ash is not strictly limited, and is preferably 5-30 mm.

[0020] As the preferred technical solution, before the curing treatment, the fly ash, the furnace bottom slag and the limestone are mixed in proportion, and the water and the carbide slag are added, and wet grinding is performed until all the components pass through a 0.06-0.09 mm square hole screen, and then the wet grinding material is loaded into a mold to press into solid waste solid blocks.

[0021] In the second aspect, the present application also provides a concrete solid block curing system, which also belongs to the protection scope of the present application, and specifically comprises, in sequence, a raw material pretreatment mechanism, a mixing mechanism, a brick pressing mechanism, a concrete solid block curing device and a product collecting mechanism.

[0022] The raw material pretreatment mechanism can crush, proportion and pretreat the coal-based solid waste, and comprises a crusher, a screening machine, a conveyor, a mixer, a brick press and the like; the concrete solid block curing device can cure the pretreated material under a certain temperature and pressure by using industrial waste gas containing CO2, and specifically comprises a reaction kettle, a heating device, a stirring device, a CO2 supply device, a temperature controller, a pressure gauge and the like; and the product collecting mechanism is mainly used for screening and packaging the cured solid block product.

[0023] The curing system of the present application adopts an advanced parameter automatic control device, which can accurately control the temperature, pressure, CO2 concentration and other parameters in the reaction process, promotes the mineralization reaction of the active components in the coal-based solid waste by using the mineralization of CO2, and thus obtains a concrete solid block product with higher strength.

[0024] As preferred in the technical solution, the system further comprises a waste gas recovery mechanism in communication with the CO2 mineralization curing mechanism, which can recover and utilize the waste gas and residual heat in the CO2 mineralization curing mechanism in time. Advantages:

[0025] The preparation method of the concrete solid block mainly utilizes water vapor to make the silicon oxide and aluminum oxide in the solid waste undergo a wet reaction to generate silicate and aluminate hydrolysis products, which then undergo a mineralization reaction with CO2 to generate stable carbonate minerals, thereby improving the strength of the product. The CO2 mineralization and steam coupling progressive curing can reduce the use amount of steam and CO2 gas, reduce the emission of tail gas, reduce energy consumption, significantly improve the production efficiency of CO2 curing and the utilization efficiency of CO2 gas, and the carbon sequestration capacity and mineralization depth of the concrete solid block product, and can avoid the phenomenon of internal layering of the concrete solid block product caused by rapid heating, reduce greenhouse gas emissions, and be easy to promote on a large scale.

[0026] The concrete solid block curing system of the present application does not require high-temperature and high-pressure equipment, the reaction conditions are mild, the pretreatment process is avoided, the overall process is simple and fast, compared with the prior art, not only the cost is reduced, but also the amount of CO2 fixed per unit of energy consumption is increased, and the technical and economic advantages are significant. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the specific embodiments or prior art description will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0028] Fig. 1 is a schematic diagram of the concrete solid block curing method of the present application;

[0029] Fig. 2 is a schematic diagram of the concrete solid block curing system of the present application. DETAILED DESCRIPTION

[0030] It should be noted that the following detailed description is exemplary in nature and is intended to provide further description of the application. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0031] It is also important to note that the terms used herein are not intended to limit the particular embodiments of the present application disclosed in this specification. Rather, unless otherwise specified, as used herein, the singular forms "a," "an," and "the" include plural reference unless the context clearly dictates otherwise. Furthermore, it is to be understood that the terms "comprise" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0032] The technical solutions of the present application will be described in detail below in conjunction with the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0033] Embodiment 1

[0034] 1) Take fly ash 60 parts, furnace slag 20 parts, and limestone 10 parts, and mix them in proportion;

[0035] 2) Mix the mixture with 10 parts of water and 3 parts of carbide slag, and wet grind until all ingredients pass through a 0.075 mm square hole sieve;

[0036] 3) Load the wet ground material into a mold for compression molding, and perform pre-curing performance testing;

[0037] 4) Place the molded sample in a carbon dioxide mineralization curing mechanism, and first pre-cure for 4 hours under the conditions of CO2 concentration ≥ 30%, pressure 1.0 MPa, temperature 100°C, and relative humidity 95%;

[0038] 5) Then introduce CO2 with a concentration ≥ 99% into the carbon dioxide mineralization curing mechanism, increase the temperature and pressure, the temperature increasing speed is 30°C / h, the pressure increasing speed is 0.5 MPa / h, the temperature is maintained at 140°C, the pressure is increased to 2 MPa, and curing is performed for 6 hours;

[0039] 6) Stop introducing CO2, continue to maintain the temperature for 10 hours, and complete the curing;

[0040] 7) pressure relief, unreacted gas is passed into the exhaust gas recovery mechanism, in continuous curing operation, the exhaust gas can be passed in at step 4) as part of the pre-curing gas for reuse;

[0041] 8) screen the cured sample to obtain concrete solid block products of 100*90*300 specifications, and test the sample performance.

[0042] Example 2

[0043] 1) take fly ash 60 parts, furnace bottom slag 20 parts, limestone 10 parts, and mix them in proportion;

[0044] 2) mix the mixture with 10 parts of water and 3 parts of carbide slag, and wet grind until all ingredients pass through a 0.075 mm square hole screen;

[0045] 3) load the wet ground material into a mold for compression molding, and perform pre-curing performance testing;

[0046] 4) place the molded sample in a carbon dioxide mineralization curing mechanism, first pre-cure for 5 hours under the conditions of CO2 concentration ≥ 30%, pressure 2.0 MPa, temperature 50°C, relative humidity 95%;

[0047] 5) then introduce CO2 with a concentration ≥ 99% into the carbon dioxide mineralization curing mechanism, increase the temperature and pressure, the temperature increase rate is 50°C / h, the pressure increase rate is 1.0 MPa / h, the temperature is maintained at 150°C, the pressure is increased to 2 MPa, and cured for 5 hours;

[0048] 6) stop passing in CO2, continue to maintain the temperature for 5 hours, and complete the curing;

[0049] 7) pressure relief, unreacted gas is passed into the exhaust gas recovery mechanism, in continuous curing operation, the exhaust gas can be passed in at step 4) as part of the pre-curing gas for reuse;

[0050] 8) screen the cured sample to obtain concrete solid block products of 100*90*300 specifications, and test the sample performance.

[0051] Example 3

[0052] 1) take fly ash 60 parts, furnace bottom slag 20 parts, limestone 10 parts, and mix them in proportion;

[0053] 2) mix the mixture with 10 parts of water and 3 parts of carbide slag, and wet grind until all ingredients pass through a 0.075 mm square hole screen;

[0054] 3) load the wet ground material into a mold for compression molding, and perform pre-curing performance testing;

[0055] 4) Put the shaped sample into the carbon dioxide mineralization curing mechanism, and pre-cure the reaction under the conditions of CO2 concentration ≥ 30%, pressure 0.5 MPa, temperature 100°C, and relative humidity 95% for 6 hours;

[0056] 5) Then introduce CO2 with a concentration ≥ 99% into the carbon dioxide mineralization curing mechanism, increase the temperature and pressure, the temperature increasing speed is 30°C / h, the pressure increasing speed is 0.5 MPa / h, the temperature is maintained at 150°C, the pressure is increased to 1 MPa, and curing is performed for 8 hours;

[0057] 6) Stop the introduction of CO2, continue to maintain the temperature for 4 hours, and complete the curing;

[0058] 7) Release the pressure, introduce the unreacted gas into the waste gas recovery mechanism, and in the continuous curing operation, the waste gas can be introduced in step 4) as part of the pre-curing gas for reuse;

[0059] 8) Screen the cured sample to obtain concrete solid block products with a specification of 100*90*300, and test the sample performance.

[0060] Example 4

[0061] 1) Take fly ash 60 parts, furnace bottom slag 20 parts, and limestone 10 parts, and mix them in proportion;

[0062] 2) Add 10 parts of water and 3 parts of carbide slag to the mixture, and wet grind until all the ingredients pass through a 0.075 mm square hole screen;

[0063] 3) Put the wet ground material into a mold for compression molding, and test the compressive strength of the sample before curing;

[0064] 4) Put the shaped sample into the curing system, and cure it under the conditions of CO2 concentration ≥ 99%, pressure 1.5 MPa, temperature 100°C, and relative humidity 95% for 6 hours;

[0065] 5) Screen the cured sample to obtain concrete solid block products with a specification of 100*90*300, and test the compressive strength of the sample.

[0066] Example 5

[0067] 1) Take fly ash 60 parts, furnace bottom slag 20 parts, and limestone 10 parts, and mix them in proportion;

[0068] 2) Add 10 parts of water and 3 parts of carbide slag to the mixture, and wet grind until all the ingredients pass through a 0.075 mm square hole screen;

[0069] 3) Put the wet ground material into a mold for compression molding, and test the compressive strength of the sample before curing;

[0070] 4) Put the shaped sample into the curing system, and cure for 6h under the conditions of CO2 concentration ≥99%, pressure 2MPa, temperature 100℃, and relative humidity 95%;

[0071] 5) Screen the cured sample to obtain concrete solid block products of 100*90*300 specifications, and test the compressive strength of the sample.

[0072] Example 6

[0073] 1) Take fly ash 60 parts, furnace bottom slag 20 parts, and limestone 10 parts, and mix them in proportion;

[0074] 2) Add the mixture to 10 parts of water and 3 parts of carbide slag, and wet grind until all the ingredients pass through a 0.075mm square hole screen;

[0075] 3) Put the wet ground material into a mold for compression molding, and test the compressive strength of the sample before curing;

[0076] 4) Put the shaped sample into the curing system, and cure for 10h under the conditions of CO2 concentration ≥99%, pressure 1.0MPa, temperature 150℃, and relative humidity 95%;

[0077] 5) Screen the cured sample to obtain concrete solid block products of 100*90*300 specifications, and test the compressive strength of the sample.

[0078] Example 7

[0079] 1) Take fly ash 60 parts, furnace bottom slag 20 parts, and limestone 10 parts, and mix them in proportion;

[0080] 2) Mix the mixture with 10 parts of water and 3 parts of carbide slag, and wet grind until all the ingredients pass through a 0.075mm square hole screen;

[0081] 3) Put the wet ground material into a mold for compression molding, and test the performance before curing;

[0082] 4) Put the shaped sample into the carbon dioxide mineralization curing mechanism, and first pre-cure for 3h under the conditions of CO2 concentration ≥30%, pressure 1.0MPa, temperature 100℃, and relative humidity 95%;

[0083] 5) Then introduce CO2 with a concentration ≥99% into the carbon dioxide mineralization curing mechanism, increase the temperature and pressure, the temperature increasing speed is 30℃ / h, the pressure increasing speed is 0.5MPa / h, the temperature is maintained at 140℃, the pressure is increased to 2MPa, and the curing is performed for 10h;

[0084] 6) Release the pressure, and introduce the unreacted gas into the exhaust gas recovery mechanism, which can be introduced in step 4) as part of the pre-curing gas for reuse in continuous curing operation;

[0085] 7) Screen the cured sample to obtain a 100*90*300 size concrete solid block product, and test the sample performance.

[0086] Example 8

[0087] 1) Take fly ash 60 parts, furnace bottom slag 20 parts, and limestone 10 parts, and mix them in proportion;

[0088] 2) Mix the mixture with 10 parts of water and 3 parts of carbide slag, and wet grind until all ingredients pass through a 0.075 mm square hole screen;

[0089] 3) Load the wet ground material into a mold for compression molding, and perform pre-curing performance testing;

[0090] 4) Place the molded sample in a carbon dioxide mineralization curing mechanism, and first pre-cure for 6 h under the conditions of CO2 concentration ≥ 30%, pressure 2.0 MPa, temperature 50°C, and relative humidity 95%;

[0091] 5) Then introduce CO2 with a concentration ≥ 99% into the carbon dioxide mineralization curing mechanism, increase the temperature and pressure, with a temperature increase rate of 30°C / h and a pressure increase rate of 0.5 MPa / h, maintain the temperature at 150°C, increase the pressure to 1.5 MPa, and cure for 8 h to complete the curing;

[0092] 6) Release the pressure, and introduce the unreacted gas into a waste gas recovery mechanism. In continuous curing operation, the waste gas can be introduced at the stage of step 4) as part of the pre-curing gas for reuse;

[0093] 7) Screen the cured sample to obtain a 100*90*300 size concrete solid block product, and test the sample performance.

[0094] Example 9

[0095] 1) Take fly ash 60 parts, furnace bottom slag 20 parts, and limestone 10 parts, and mix them in proportion;

[0096] 2) Mix the mixture with 10 parts of water and 3 parts of carbide slag, and wet grind until all ingredients pass through a 0.075 mm square hole screen;

[0097] 3) Load the wet ground material into a mold for compression molding, and perform pre-curing performance testing;

[0098] 4) Place the molded sample in a carbon dioxide mineralization curing mechanism, and first pre-cure for 6 h under the conditions of CO2 concentration ≥ 30%, pressure 2.0 MPa, temperature 50°C, and relative humidity 95%;

[0099] 5) then introduce CO2 with concentration ≥ 99% into the carbon dioxide mineralization curing mechanism, increase temperature and pressure, temperature increasing speed is 30°C / h, pressure increasing speed is 0.5 MPa / h, temperature is kept at 100°C, pressure is increased to 2 MPa, curing for 10 h, and curing is completed;

[0100] 6) release pressure, and unreacted gas is introduced into the waste gas recovery mechanism, and in continuous curing operation, the waste gas can be introduced at step 4) as part of the pre-curing gas for reuse;

[0101] 7) screen the cured sample to obtain concrete solid block products with a specification of 100*90*300, and test the sample performance.

[0102] Comparative Example 1

[0103] The difference between this comparative example and Example 1 is that water vapor is introduced after CO2 curing.

[0104] 1) take fly ash 60 parts, furnace bottom slag 20 parts, and limestone 10 parts, and mix according to the proportion;

[0105] 2) mix the mixture with 10 parts of water and 3 parts of carbide slag, and wet grind until all components pass through a 0.075 mm square hole sieve;

[0106] 3) load the wet ground material into a mold for compression molding, and perform performance testing before curing;

[0107] 4) place the molded sample in a carbon dioxide mineralization curing mechanism, and first cure for 3 h under the conditions of CO2 concentration ≥ 99%, pressure 1.5 MPa, and temperature 80°C;

[0108] 5) then introduce water vapor into the carbon dioxide mineralization curing mechanism, keep the temperature at 100°C, reduce the pressure to 0.5 MPa, and the humidity to 100%, and cure for 2 h;

[0109] 6) stop introducing water vapor, and continue to keep warm and cure until the curing time reaches 10 h, and the curing is completed;

[0110] 7) screen the cured sample to obtain concrete solid block products with a specification of 100*90*300, and test the sample performance.

[0111] Comparative Example 2

[0112] The difference between this comparative example and Example 1 is that no CO2 gas source is introduced.

[0113] 1) take fly ash 60 parts, furnace bottom slag 20 parts, and limestone 10 parts, and mix according to the proportion;

[0114] 2) Mix the mixture with 10 parts of water, 3 parts of carbide slag, and wet grind until all ingredients pass through a 0.075 mm square hole screen;

[0115] 3) Load the wetted mixture into a mold for compression molding, and test the performance before curing;

[0116] 4) Place the molded sample in a carbon dioxide mineralization curing mechanism, introduce waste gas, and cure under the conditions of a pressure of 1.5 MPa, a temperature of 100 DEG C, and a humidity of 100% for 3 h;

[0117] 5) Then adjust the waste pressure to 0.5 MPa, maintain the temperature at 100 DEG C and the humidity at 100%, and continue to cure for 2 h;

[0118] 6) Repeat the above curing process until the curing time reaches 10 h, and complete the curing;

[0119] 7) Screen the cured sample to obtain a 100*90*300 specification concrete solid block product, and test the performance of the sample.

[0120] The present application tests the strength of the solid block before and after curing in Example 1, Example 4, Example 7, and Comparative Examples 1-2, and Table 1 is the test results.

[0121] Table 1 Test Results

[0122] As can be seen from Table 1, compared with the prior art, the curing method of the present application can significantly improve the compressive strength of the concrete solid block and prevent the concrete solid block from cracking.

[0123] At the same time, the present application also tests the crack generation rate, mineralization depth, and carbon sequestration capacity of the concrete solid blocks prepared in the above examples and comparative examples, the test method is as follows, and the test results are shown in Table 2.

[0124] Crack generation rate: analyzed by statistical method;

[0125] Mineralization depth: analyzed by phenolphthalein test method;

[0126] Carbon sequestration capacity: by thermogravimetric analysis, test the weight loss of the product in the range of 600-800 DEG C, calculate the carbon sequestration capacity of the concrete solid block.

[0127] Table 2 Test Results

[0128] As shown in Table 2, by using the maintenance method, the production efficiency of carbon dioxide mineralization maintenance and the utilization efficiency of carbon dioxide gas can be significantly improved, the carbon sequestration capacity and mineralization depth of the coal-based solid waste solid block product can be improved, the layering phenomenon of the coal-based solid waste solid block product caused by rapid temperature rise can be avoided, the greenhouse gas emission can be reduced, and the method is easy to popularize on a large scale.

[0129] In addition, the progressive maintenance coupled by carbon dioxide mineralization and steam can recycle the depleted gas, is compatible with different types of steam autoclaves, shares one set of external gas source and pressure regulating device, and greatly reduces the investment cost.

[0130] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method of manufacturing a concrete solid block, characterized in that, The following steps are involved: The bottom slag, fly ash, limestone and water are mixed and pressed into solid waste solid blocks, which are then placed in a carbon dioxide mineralization curing mechanism in sequence, first pre-cured in a carbon dioxide atmosphere containing water vapor, and then subjected to mineralization treatment to obtain concrete solid blocks.

2. The production method according to claim 1, characterized by, In the carbon dioxide mineralization curing mechanism, the solid waste solid blocks are sequentially subjected to a primary pre-curing treatment, a secondary mineralization treatment, and a tertiary thermal insulation mineralization treatment; or the solid waste solid blocks are sequentially subjected to primary pre-curing treatment and secondary mineralization treatment; Wherein, the first-level pre-curing treatment is carried out in a carbon dioxide atmosphere containing water vapor with a relative humidity greater than 95%; The secondary mineralization treatment is carried out in a carbon dioxide atmosphere with a concentration greater than or equal to 99%.

3. The production method according to claim 2, characterized by, During the primary pre-curing treatment, the pressure is controlled to be 0.5-2 MPa, the temperature is 50-150° C., the carbon dioxide concentration is greater than or equal to 30%, and the reaction time is 4-6 hours.

4. The preparation method according to claim 2, characterized in that During the secondary mineralization treatment, a multi-stage heating and pressurizing mode is adopted, the pressure is increased to 0.5-2 MPa at a pressurizing rate of 0.5-1.0 MPa / h, the temperature is increased to 50-150° C. at a heating rate of 30-50° C. / h, and the reaction is carried out for 4-10 hours.

5. The preparation method according to claim 2, characterized in that During the three-stage heat preservation mineralization treatment, the pressure of the mineralization reaction is 0.5-2.0 MPa, the temperature is 50-150° C., and the time is 4-10 hours.

6. The method of claim 1, wherein, The concrete solid building block comprises the following raw materials in parts by weight: 60-80 parts of fly ash, 20-30 parts of bottom slag, 5-15 parts of limestone, 0-5 parts of carbide slag and 10-15 parts of water.

7. The preparation method according to claim 1, characterized in that The particle size of the bottom ash and the fly ash is 5-30 mm.

8. The method of claim 1, wherein, Before curing, fly ash, bottom ash and limestone are mixed in proportion, and water and carbide slag are added. They are wet-ground until all components pass through a 0.06-0.09mm square hole sieve. The wet-ground material is then loaded into a mold and pressed into solid waste blocks.

9. A concrete masonry unit curing system characterized by, It includes a raw material pre-processing mechanism, a mixing mechanism, a brick pressing mechanism, a concrete solid block curing device and a product collecting mechanism which are connected end to end. The concrete solid block curing device includes a steam generator, a carbon dioxide gas source and a carbon dioxide mineralization curing mechanism, and the steam generator and the carbon dioxide gas source are both connected to the carbon dioxide mineralization curing mechanism.

10. The concrete masonry unit curing system of claim 9, wherein, It also includes a spent gas recovery mechanism, which is connected to the carbon dioxide mineralization maintenance mechanism.

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