CN115010419A - Multi-solid waste sludge-based carbon mineralized non-sintered ceramsite and preparation method thereof - Google Patents
Multi-solid waste sludge-based carbon mineralized non-sintered ceramsite and preparation method thereof Download PDFInfo
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- CN115010419A CN115010419A CN202210756229.2A CN202210756229A CN115010419A CN 115010419 A CN115010419 A CN 115010419A CN 202210756229 A CN202210756229 A CN 202210756229A CN 115010419 A CN115010419 A CN 115010419A
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- Prior art keywords
- solid waste
- preparation
- sludge
- waste sludge
- based carbon
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Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/009—Porous or hollow ceramic granular materials, e.g. microballoons
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/0231—Carbon dioxide hardening
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention provides a multi-solid waste sludge-based carbon mineralized non-sintered ceramsite, which comprises the following components in parts by mass: 40-75 parts of sludge, 10-20 parts of phosphogypsum, 15-25 parts of bottom slag, 10-20 parts of steel slag, 5-15 parts of cement, 1-3 parts of excitant and 0.2-1 part of dispersant. The non-sintered ceramsite is mineralized and cured by carbon dioxide, so that the curing period of the non-sintered ceramsite is shortened, and the strength of the non-sintered ceramsite is higher.
Description
Technical Field
The invention belongs to the technical field of building material preparation, and particularly relates to a multi-solid waste sludge-based carbon mineralized non-fired ceramsite and a preparation method thereof.
Background
At present, the production amount of the construction waste in China is increased year by year, the resource utilization rate of the construction waste is low, the reasonable disposal of the construction waste is promoted, the whole process supervision platform of the construction waste is perfected, and the country and the society pay more and more attention to the 'by-products' of the construction. At present, the proportion of industrial solid waste is low, and the stockpiling of a large amount of industrial solid waste not only occupies and destroys land resources, but also pollutes underground water and causes dust raising. In addition, a large amount of sludge such as building residue soil and building slurry is generated every year in the engineering construction process, and the resource utilization of the pollution sludge also becomes a hot problem.
The existing resource utilization of the sludge is generally characterized in that curing agents such as cement, lime and the like are adopted for consolidation, and the non-sintered ceramsite is prepared from the utilized raw materials mainly including common varieties such as fly ash, slag, gypsum and the like, so that the application to industrial waste residues which are difficult to utilize is less.
At present, there are reports related to the utilization of sludge and industrial solid waste to produce non-sintered ceramsite, for example, patent CN201810482831.5 discloses a non-sintered ceramsite containing steel slag and a preparation method thereof, wherein the non-sintered ceramsite is prepared from the following raw materials: the non-fired ceramsite utilizes sludge and slag, but the mixing amount of the sludge is less, and the strength of the non-fired ceramsite is lower. Patent CN202110655235.4 discloses a steel slag desulfurization byproduct solidified sludge-based non-sintered ceramsite and a preparation method thereof, wherein the non-sintered ceramsite is prepared from the following raw materials: silt, steel slag desulfurization by-products, cement, mineral admixture, excitant and dispersant. After the baking-free ceramsite is subjected to water spraying curing and covering film curing for 7-14 days, the 28-day cylinder pressing strength reaches 4.2-4.7 MPa, the water absorption rate for 1 hour reaches 9.5-11.1%, and sludge is consumed, and meanwhile, a steel slag desulphurization byproduct which is difficult to utilize is applied, but the method has long curing period and low production efficiency, and the strength of the baking-free ceramsite needs to be improved.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides the multi-solid waste sludge-based carbon mineralized non-fired ceramsite, which is maintained through carbon dioxide mineralization, so that the maintenance period of the non-fired ceramsite is shortened, and the strength of the non-fired ceramsite is higher.
The technical scheme adopted for realizing the above purpose of the invention is as follows:
the multi-solid waste sludge-based carbon mineralized non-fired ceramsite comprises the following components in parts by mass: 40-75 parts of sludge, 10-20 parts of phosphogypsum, 15-25 parts of bottom slag, 10-20 parts of steel slag, 5-15 parts of cement, 1-3 parts of excitant and 0.2-1 part of dispersant.
The excitant is one or a mixture of more than two of lime, gypsum, a sodium-based excitant or water glass.
The excitant is a mixture of lime and gypsum according to the mass ratio of 1: 2.
The dispersing agent is a naphthalene water reducing agent.
The invention also provides a preparation method of the multi-solid waste sludge based carbon mineralized non-fired ceramsite, which comprises the following steps: (1) respectively drying and grinding the sludge, the phosphogypsum, the bottom slag and the steel slag;
(2) mixing and homogenizing the ground sludge, phosphogypsum, furnace bottom slag and steel slag with cement, an activator and a dispersant to obtain a mixed material, and pelletizing the mixed material and water to obtain particles;
(3) and (3) pre-curing the particles, then performing carbon dioxide mineralization curing, and finally performing natural curing to obtain the multi-solid waste sludge-based carbon mineralization baking-free ceramsite.
The carbon dioxide mineralization curing conditions are as follows: CO 2 2 The pressure is 0.5-1.5 MPa, the temperature is 80-120 ℃, and the time is 2-3 h.
The pre-curing conditions are as follows: the temperature is 20 +/-1 ℃, the humidity is 80 +/-5% RH, and the mixture is placed for 12-24 h.
The natural curing conditions are as follows: the temperature is 25 +/-5 ℃, the humidity is 40 +/-10% RH, and the time is 3-5 d.
And (3) when the mixed material and water are pelletized in the step (2), the water-solid ratio is 0.20-0.35, and a pelletizing disc is adopted for pelletizing, wherein the rotating speed of the pelletizing disc is 30-50 r/min, and the pelletizing time is 30-45 min.
The specific surface area of the ground materials in the step (1) is more than or equal to 450cm 2 The mixed grain diameter of the ground sludge, the phosphogypsum, the furnace bottom slag and the steel slag is less than or equal to 120 mu m.
Compared with the prior art, the carbon mineralized non-sintered ceramsite based on the multi-solid waste sludge provided by the invention has the following advantages: (1) the non-fired ceramsite realizes resource utilization of the sludge, simultaneously utilizes the phosphogypsum, furnace bottom slag and steel slag solid waste, solves the problems of environment pollution caused by sludge stacking and difficulty in utilization of the phosphogypsum, the furnace bottom slag and other solid waste, and has good economic benefit and social benefit.
(2) The non-sintered ceramsite of the invention adopts CO 2 The mineralization curing replaces the traditional high-temperature curing and hydration steam curing to exert the solid wasteThe carbon fixation potential is reduced, the energy consumption is reduced, carbon dioxide is absorbed, the curing period is shortened, and the strength, the durability and the like of the produced non-sintered ceramsite are improved.
(3) Under the action of the exciting agent, the furnace bottom slag and the steel slag are solidified by taking cement as a binding agent, and the multiple solid wastes cooperate to better excite the potential activity of the solid wastes and improve the early strength of the non-sintered ceramsite. In addition, the main component of the phosphogypsum is calcium sulfate, which can increase Ca in the system 2+ The components improve the absorption amount of carbon dioxide during mineralization and further improve the strength of the mineralized unfired ceramsite. The excitant is a mixture of lime and gypsum, and can improve Ca in the system while exciting the bottom slag and the steel slag 2+ And (3) components.
Detailed Description
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention is further described in detail with reference to the following examples.
Examples 1 to 3
The multi-solid waste sludge-based carbon mineralized non-fired ceramsite provided by the embodiment is prepared by the following method:
(1) respectively putting the sludge, the phosphogypsum, the furnace bottom slag and the steel slag into an electrothermal blowing drying oven to be dried at 105 ℃, cooling to normal temperature and then grinding;
(2) mixing and homogenizing the ground sludge, phosphogypsum, furnace bottom slag and steel slag with cement, an activator and a dispersant according to the required proportion to obtain a mixed material, and pelletizing the mixed material and water to obtain particles;
(3) and (3) pre-curing the particles, then performing carbon dioxide mineralization curing, and finally performing natural curing to obtain the multi-solid waste sludge-based carbon mineralization baking-free ceramsite.
Examples 2-3 were prepared according to the method of example 1, and the formulation compositions and performance tests are shown in the following table.
Comparative examples 1 to 3
Comparative examples 1 to 3 andthe difference between the examples is the pre-curing of the particles and the CO 2 And the mineralization curing step is replaced by high-temperature steam curing.
From the above table, the carbon mineralized non-fired ceramsite containing multi-solid waste sludge provided by the invention is applied to various industrial waste residues which are difficult to utilize, and CO is used 2 The mineralization curing replaces the traditional high-temperature curing, natural curing and the like, the strength of the produced non-sintered ceramsite is greatly improved, the water absorption and other properties are good, and the curing period is greatly shortened.
Claims (10)
1. A carbon mineralized non-sintered ceramsite based on multi-solid waste sludge is characterized in that: the non-fired ceramsite comprises the following components in parts by mass: 40-75 parts of sludge, 10-20 parts of phosphogypsum, 15-25 parts of bottom slag, 10-20 parts of steel slag, 5-15 parts of cement, 1-3 parts of excitant and 0.2-1 part of dispersant.
2. The multi-solid waste sludge-based carbon-mineralized non-fired ceramsite according to claim 1, which is characterized in that: the excitant is one or a mixture of more than two of lime, gypsum, a sodium-based excitant or water glass.
3. The multi-solid waste sludge-based carbon mineralized non-fired ceramsite according to claim 2, which is characterized in that: the excitant is a mixture of lime and gypsum according to the mass ratio of 1: 2.
4. The multi-solid waste sludge-based carbon mineralized non-fired ceramsite according to claim 1, which is characterized in that: the dispersing agent is a naphthalene water reducing agent.
5. The preparation method of the multi-solid waste sludge-based carbon mineralized unfired ceramsite according to claim 1, which is characterized by comprising the following steps of: (1) respectively drying and grinding the sludge, the phosphogypsum, the bottom slag and the steel slag;
(2) mixing and homogenizing the ground sludge, phosphogypsum, furnace bottom slag and steel slag with cement, an activator and a dispersant to obtain a mixed material, and pelletizing the mixed material and water to obtain particles;
(3) and (3) pre-curing the particles, then performing carbon dioxide mineralization curing, and finally performing natural curing to obtain the multi-solid waste sludge-based carbon mineralization baking-free ceramsite.
6. The preparation method of the multi-solid waste sludge-based carbon mineralization unfired ceramsite according to claim 5, wherein the preparation method comprises the following steps: the carbon dioxide mineralization curing conditions are as follows: CO 2 2 The pressure is 0.5-1.5 MPa, the temperature is 80-120 ℃, and the time is 2-3 h.
7. The preparation method of the multi-solid waste sludge-based carbon mineralized non-fired ceramsite according to claim 5, which is characterized by comprising the following steps of: the pre-curing conditions are as follows: the temperature is 20 +/-1 ℃, the humidity is 80 +/-5% RH, and the mixture is placed for 12-24 h.
8. The preparation method of the multi-solid waste sludge-based carbon mineralization unfired ceramsite according to claim 5, wherein the preparation method comprises the following steps: the natural curing conditions are as follows: the temperature is 25 +/-5 ℃, the humidity is 40 +/-10% RH, and the time is 3-5 d.
9. The preparation method of the multi-solid waste sludge-based carbon mineralized non-fired ceramsite according to claim 5, which is characterized by comprising the following steps of: and (3) when the mixed material and water are pelletized in the step (2), the water-solid ratio is 0.20-0.35, and a pelletizing disc is adopted for pelletizing, wherein the rotating speed of the pelletizing disc is 30-50 r/min, and the pelletizing time is 30-45 min.
10. The preparation method of the multi-solid waste sludge-based carbon mineralization unfired ceramsite according to claim 5, wherein the preparation method comprises the following steps: the specific surface area of the ground materials in the step (1) is more than or equal to 450cm 2 The mixed grain diameter of the ground sludge, the phosphogypsum, the furnace bottom slag and the steel slag is less than or equal to 120 mu m.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210756229.2A CN115010419A (en) | 2022-06-30 | 2022-06-30 | Multi-solid waste sludge-based carbon mineralized non-sintered ceramsite and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210756229.2A CN115010419A (en) | 2022-06-30 | 2022-06-30 | Multi-solid waste sludge-based carbon mineralized non-sintered ceramsite and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115611539A (en) * | 2022-11-09 | 2023-01-17 | 中冶南方都市环保工程技术股份有限公司 | Recycled aggregate and roadbed material prepared by cooperation of steel slag and phosphogypsum and preparation method of recycled aggregate and roadbed material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115611539B (en) * | 2022-11-09 | 2024-02-06 | 中冶南方都市环保工程技术股份有限公司 | Recycled aggregate prepared from steel slag and phosphogypsum, roadbed material and preparation method of recycled aggregate |
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