CN114195444A - High-moisture-content sludge baking-free brick and preparation method thereof - Google Patents
High-moisture-content sludge baking-free brick and preparation method thereof Download PDFInfo
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- CN114195444A CN114195444A CN202111329960.9A CN202111329960A CN114195444A CN 114195444 A CN114195444 A CN 114195444A CN 202111329960 A CN202111329960 A CN 202111329960A CN 114195444 A CN114195444 A CN 114195444A
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- sludge
- free brick
- baking
- moisture content
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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
- C04B28/02—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 containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0418—Wet materials, e.g. slurries
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- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to the technical field of sludge recycling, and discloses a high-moisture-content sludge baking-free brick and a preparation method thereof, wherein the preparation method comprises the following steps of; s1, removing impurities from the sludge: removing sundries such as branches, cloth strips, weeds and the like in the sludge manually or by using a grid machine; s2, natural dehydration: naturally drying the impurity-removed sludge with high water content in an open field to reduce the water content of the sludge to 50-55% for later use; s3, adding and mixing: mixing and stirring uniformly the weighed 40-60% of sludge to be used, 3-10% of cement, 5-20% of slag, 20-40% of phosphogypsum, 0.2-2% of excitant and 0.5-6% of retarder to obtain a sludge mixture. According to the high-water-content sludge baking-free brick and the preparation method thereof, the industrial waste is used as a main raw material to solidify the river sludge, the process is simple, the solidification effect is good, the waste is treated by the waste, and the environment-friendly development concept is met. Phosphorus, fluorine and heavy metals in the sludge and the gypsum can be well sealed in a solidified body, so that the pollution to the environment is reduced.
Description
Technical Field
The invention relates to the technical field of sludge recycling, in particular to a high-moisture-content sludge baking-free brick and a preparation method thereof.
Background
The sludge is a mud-water mixture generated by dredging the sediments of water bodies such as rivers, lakes and the like, the water content of the mud-water mixture is generally over 70 percent, and the mud-water mixture has large viscosity, fine particles and is rich in organic matters. With the improvement of the living standard of residents and the acceleration of the process of urbanization, the national attention on the water environment is gradually increased. A large amount of river channel dredging projects are started in China, but because the amount of sludge generated by dredging is large, how to digest and dispose the sludge generated by the dredging projects becomes a key in the water environment treatment link. The traditional disposal mode is mainly stockpiling and landfill, the two treatment modes are quite negative, large-area land resources are occupied, sludge has fluidity, is easy to spill and leak during transportation to a storage yard and is accompanied by odor, the daily life of urban residents is affected, and secondary pollution is caused to underground water and soil when the storage yard is stockpiled for a long time. Therefore, considering the comprehensive utilization of the sludge, the sludge is regarded as a resource, and is digested in situ, so that the waste is changed into valuable, and the comprehensive problem of sludge disposal can be solved fundamentally.
Building materials and bricks are building materials with very limited transport radius, because of lack of local resources, raw materials of most building material manufacturers come from provinces, the transport cost is high, and along with the enhancement of the national work on environmental protection and sustainable development, the acquisition of brick making raw materials is increasingly difficult, and the price is high.
The existing sludge baking-free brick technology is that sludge is dehydrated to the moisture content of 30-40% by mechanical dehydration equipment such as a filter press and a dryer, and then cement is used as a coagulant to prepare the sludge baking-free brick through extrusion molding. Although the sludge brick prepared by the method has higher strength, the economic benefit is poor because large-scale mechanical equipment is required to be invested in the early stage, a large enough dehydration site is required, and a dehydration medicament is required to be added. In addition, because a large amount of cement is required to be added according to mechanical properties, the cement is expensive, and the production is accompanied with the consumption of environmental resources, and comprehensively, the technology has the defects of high preparation cost, low environmental protection level and low market competitiveness.
Aiming at the defects in the prior art, the invention provides the preparation method of the high-moisture-content sludge baking-free brick through a series of research and development and tests, optimizes the existing baking-free brick manufacturing process, makes up the defects in the prior art, reduces the cost, the consumption of the existing resources and energy sources, reduces the production procedures and greatly improves the market competitiveness of the product.
Disclosure of Invention
Technical problem to be solved
The invention provides a high-moisture content sludge baking-free brick and a preparation method thereof, which have the advantages of reducing the cost, reducing the consumption of the existing resources and energy sources and the like, and solve the problems in the background art.
(II) technical scheme
The invention provides the following technical scheme: a high water content sludge baking-free brick and a preparation method thereof comprise the following steps;
s1, removing impurities from the sludge: removing sundries such as branches, cloth strips, weeds and the like in the sludge manually or by using a grid machine;
s2, natural dehydration: naturally drying the impurity-removed sludge with high water content in an open field to reduce the water content of the sludge to 50-55% for later use;
s3, adding and mixing: mixing and stirring uniformly weighed 40-60% of sludge to be used, 3-10% of cement, 5-20% of slag, 20-40% of phosphogypsum, 0.2-2% of excitant and 0.5-6% of retarder to obtain a sludge mixture;
s4, press forming: pouring the mixture into a forming die, and pressing and forming by adopting a full-automatic integrated static-pressure brick machine;
s5, maintenance: and (5) placing the green bricks after the pressing forming in an indoor natural environment for curing for 28 d.
Preferably, the cement in the S3 is ordinary portland cement with grade No. 425 and specific surface area not less than 300m 2/kg; the slag is S95 grade granulated blast furnace slag powder, the specific surface area is not less than 400m2/kg, and the 28d activity index is not less than 95%.
Preferably, the phosphogypsum in S3 is phosphogypsum hemihydrate, which is mainly present in the form of calcium sulfate hemihydrate (CaSO 4. 1/2H 2O).
Preferably, the exciting agent in S3 is a weakly alkaline exciting agent, and is soluble in water; the retarder is citric acid, and can delay the hydration reaction of the hemihydrate gypsum.
Preferably, in the step S3, the sludge, the cement, the slag, and the weakly alkaline activator are mixed and stirred for 5min, and then the hemihydrate gypsum with the citric acid is poured into the stirrer in batches and stirred, wherein the stirring and mixing time is 5min, and the rotation speed is set to 250 r/min.
Preferably, the forming pressure in S4 is not lower than 3KN, and the forming die can be processed and customized according to the use of the finished brick.
Preferably, the green bricks in the S5 are required to be wrapped by preservative films during maintenance, so that the green bricks are prevented from being directly exposed in the air, and the surfaces of the bricks are prevented from being hairy and cracked.
(III) advantageous effects
The invention has the following beneficial effects:
1. according to the high-water-content sludge baking-free brick and the preparation method thereof, the industrial waste is used as a main raw material to solidify the river sludge, the process is simple, the solidification effect is good, the waste is treated by the waste, and the environment-friendly development concept is met. Phosphorus, fluorine and heavy metals in the sludge and the gypsum can be well sealed in a solidified body, so that the pollution to the environment is reduced.
2. The high-moisture content sludge baking-free brick and the preparation method thereof have the advantages of high strength, low cost, convenience in production, short production period, low energy consumption, no pollution and the like, can be widely applied to the engineering fields of river bank protection, pedestrian paths and the like, solve the problem of treatment of a large amount of waste sludge in lakes and rivers, reduce environmental risks, save land occupation and increase economic benefits.
Drawings
FIG. 1 is a schematic structural view of the present invention;
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, a high water content sludge baking-free brick and a preparation method thereof include the following steps;
s1, removing impurities from the sludge: removing sundries such as branches, cloth strips, weeds and the like in the sludge manually or by using a grid machine;
s2, natural dehydration: naturally drying the impurity-removed sludge with high water content in an open field to reduce the water content of the sludge to 50-55% for later use;
s3, adding and mixing: mixing and stirring uniformly weighed 40-60% of sludge to be used, 3-10% of cement, 5-20% of slag, 20-40% of phosphogypsum, 0.2-2% of excitant and 0.5-6% of retarder to obtain a sludge mixture;
s4, press forming: pouring the mixture into a forming die, and pressing and forming by adopting a full-automatic integrated static-pressure brick machine;
s5, maintenance: and (5) placing the green bricks after the pressing forming in an indoor natural environment for curing for 28 d.
Further, the cement in the S3 is ordinary portland cement with grade No. 425 and specific surface area not less than 300m 2/kg; the slag is S95 grade granulated blast furnace slag powder, the specific surface area is not less than 400m2/kg, and the 28d activity index is not less than 95%.
Furthermore, the phosphogypsum in S3 is semi-hydrated phosphogypsum which mainly exists in the form of calcium sulfate hemihydrate (CaSO4, 1/2H2O), and when the phosphogypsum is mixed with sludge, on one hand, the moisture content of the sludge can be further reduced to 40%, on the other hand, the phosphogypsum can react with aluminum in slag to generate ettringite with very high strength, so that the early strength of the sludge brick is greatly improved.
Further, the exciting agent in the S3 is a weak alkaline exciting agent, is soluble in water and is beneficial to exciting the activity of the slag; the retarder is citric acid, can delay the hydration reaction of the semi-hydrated gypsum and ensure that a gel structure generated by the hydration of the gypsum cannot be damaged in the compaction process.
Furthermore, in the feeding and mixing process of S3, sludge, cement, slag and a weakly alkaline activator are mixed and stirred for 5min, and then the hemihydrate gypsum with citric acid is poured into a stirrer in batches for stirring, wherein the stirring and mixing time is 5min, and the rotating speed is set to be 250r/min, so that different raw materials can be mixed more uniformly.
Further, the forming pressure in S4 is not lower than 3KN, and the forming die can be processed and customized according to the use of the finished brick, so that the forming die can be suitable for processing different finished bricks.
Furthermore, the green bricks in the S5 need to be wrapped by preservative films during maintenance, so that the green bricks are prevented from being directly exposed in the air, and the surfaces of the bricks are prevented from being hairy and cracked.
The specific proportion of the sludge and other materials can be properly adjusted according to engineering requirements, and the sludge and other materials can be used for meeting different application scenes.
The method utilizes the river channel sludge and solid wastes such as phosphogypsum, slag and the like to produce the sludge environment-friendly brick for engineering construction, treats waste by waste, not only solves the problem of accumulation of a large amount of sludge, but also has considerable economic benefit. The strength of the prepared sludge brick can reach more than 20MPa, and the performance requirement of the brick in engineering is met.
Through developing a compound curing agent, which comprises the steps of using semi-hydrated gypsum for dehydration, curing cement, slag and a weak alkaline excitant, and using citric acid as a retarder of the semi-hydrated gypsum. Compared with the prior art, the invention consumes the phosphogypsum and the slag industrial solid waste on the basis of preparing the high-strength sludge baking-free brick, truly realizes the utilization of the waste and changes waste into valuable. And the process is simple, the technical requirement is low, and the problems of stacking and disposing of the sludge and the common solid wastes are well solved.
The invention has simple and convenient operation mode, does not need to dry and grind the sludge, and does not need to invest large-scale mechanical equipment. The sludge is utilized locally, and the solidifying material is obtained locally, so that the method has better practical feasibility.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (7)
1. A high-moisture content sludge baking-free brick and a preparation method thereof are characterized by comprising the following steps;
s1, removing impurities from the sludge: removing sundries such as branches, cloth strips, weeds and the like in the sludge manually or by using a grid machine;
s2, natural dehydration: naturally drying the impurity-removed sludge with high water content in an open field to reduce the water content of the sludge to 50-55% for later use;
s3, adding and mixing: mixing and stirring uniformly weighed 40-60% of sludge to be used, 3-10% of cement, 5-20% of slag, 20-40% of phosphogypsum, 0.2-2% of excitant and 0.5-6% of retarder to obtain a sludge mixture;
s4, press forming: pouring the mixture into a forming die, and pressing and forming by adopting a full-automatic integrated static-pressure brick machine;
s5, maintenance: and (5) placing the green bricks after the pressing forming in an indoor natural environment for curing for 28 d.
2. The high-moisture content sludge baking-free brick and the preparation method thereof as claimed in claim 1, wherein the high-moisture content sludge baking-free brick is characterized in that: the cement in the S3 is ordinary Portland cement, the grade is No. 425, and the specific surface area is not less than 300m 2/kg; the slag is S95 grade granulated blast furnace slag powder, the specific surface area is not less than 400m2/kg, and the 28d activity index is not less than 95%.
3. The high-moisture content sludge baking-free brick and the preparation method thereof as claimed in claim 1, wherein the high-moisture content sludge baking-free brick is characterized in that: the phosphogypsum in the S3 is phosphogypsum hemihydrate, and the form of the phosphogypsum hemihydrate is mainly calcium sulfate hemihydrate (CaSO4, 1/2H 2O).
4. The high-moisture content sludge baking-free brick and the preparation method thereof as claimed in claim 1, wherein the high-moisture content sludge baking-free brick is characterized in that: the exciting agent in the S3 is a weak alkaline exciting agent and is soluble in water; the retarder is citric acid, and can delay the hydration reaction of the hemihydrate gypsum.
5. The high-moisture content sludge baking-free brick and the preparation method thereof as claimed in claim 1, wherein the high-moisture content sludge baking-free brick is characterized in that: in the step S3, the sludge, the cement, the slag and the weakly alkaline activator are mixed and stirred for 5min, and the hemihydrate gypsum with the citric acid is poured into the stirrer in batches for stirring, wherein the stirring and mixing time is 5min, and the rotating speed is set to be 250 r/min.
6. The high-moisture content sludge baking-free brick and the preparation method thereof as claimed in claim 1, wherein the high-moisture content sludge baking-free brick is characterized in that: and the forming pressure in the S4 is not lower than 3KN, and the forming die can be processed and customized according to the use of the finished brick.
7. The high-moisture content sludge baking-free brick and the preparation method thereof as claimed in claim 1, wherein the high-moisture content sludge baking-free brick is characterized in that: and in the S5, the green bricks need to be wrapped by preservative films during maintenance, so that the green bricks are prevented from being directly exposed in the air, and the surfaces of the bricks are prevented from being hairy and cracked.
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| CN202111329960.9A CN114195444A (en) | 2021-11-11 | 2021-11-11 | High-moisture-content sludge baking-free brick and preparation method thereof |
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| CN202111329960.9A CN114195444A (en) | 2021-11-11 | 2021-11-11 | High-moisture-content sludge baking-free brick and preparation method thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104788063A (en) * | 2015-04-29 | 2015-07-22 | 河海大学 | Unfired and pressing-free sludge brick and preparation method thereof |
| CN106673569A (en) * | 2016-12-16 | 2017-05-17 | 南京工业大学 | High-organic-content dredged silt composite curing material |
| CN106698872A (en) * | 2016-11-30 | 2017-05-24 | 中冶华天工程技术有限公司 | Fast sludge curing agent and method with slag as main raw material |
| CN106699099A (en) * | 2016-11-29 | 2017-05-24 | 哈尔滨理工大学 | Polypropylene fiber-reinforced alkali slag cementing material |
| CN108395171A (en) * | 2018-02-26 | 2018-08-14 | 中冶华天工程技术有限公司 | Training of channel mud recoverying and utilizing method and according to this method production it is non-burning brick |
| CN108516765A (en) * | 2018-04-27 | 2018-09-11 | 福建建中建设科技股份有限公司 | A kind of riverway sludge is non-burning brick and preparation method thereof |
| CN112479673A (en) * | 2020-11-04 | 2021-03-12 | 上海胜义环境科技有限公司 | Sludge curing agent and sludge curing method |
-
2021
- 2021-11-11 CN CN202111329960.9A patent/CN114195444A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104788063A (en) * | 2015-04-29 | 2015-07-22 | 河海大学 | Unfired and pressing-free sludge brick and preparation method thereof |
| CN106699099A (en) * | 2016-11-29 | 2017-05-24 | 哈尔滨理工大学 | Polypropylene fiber-reinforced alkali slag cementing material |
| CN106698872A (en) * | 2016-11-30 | 2017-05-24 | 中冶华天工程技术有限公司 | Fast sludge curing agent and method with slag as main raw material |
| CN106673569A (en) * | 2016-12-16 | 2017-05-17 | 南京工业大学 | High-organic-content dredged silt composite curing material |
| CN108395171A (en) * | 2018-02-26 | 2018-08-14 | 中冶华天工程技术有限公司 | Training of channel mud recoverying and utilizing method and according to this method production it is non-burning brick |
| CN108516765A (en) * | 2018-04-27 | 2018-09-11 | 福建建中建设科技股份有限公司 | A kind of riverway sludge is non-burning brick and preparation method thereof |
| CN112479673A (en) * | 2020-11-04 | 2021-03-12 | 上海胜义环境科技有限公司 | Sludge curing agent and sludge curing method |
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