CN115536357A - River and lake dredging bottom mud brick and preparation method thereof - Google Patents
River and lake dredging bottom mud brick and preparation method thereof Download PDFInfo
- Publication number
- CN115536357A CN115536357A CN202211061645.7A CN202211061645A CN115536357A CN 115536357 A CN115536357 A CN 115536357A CN 202211061645 A CN202211061645 A CN 202211061645A CN 115536357 A CN115536357 A CN 115536357A
- Authority
- CN
- China
- Prior art keywords
- bottom mud
- parts
- river
- brick
- lake
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000011454 mudbrick Substances 0.000 title claims abstract description 39
- 238000002360 preparation method Methods 0.000 title abstract description 15
- 239000011449 brick Substances 0.000 claims abstract description 44
- 239000002699 waste material Substances 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000011159 matrix material Substances 0.000 claims abstract description 29
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 24
- 239000000463 material Substances 0.000 claims abstract description 24
- 238000002156 mixing Methods 0.000 claims abstract description 18
- 238000001027 hydrothermal synthesis Methods 0.000 claims abstract description 13
- 239000002440 industrial waste Substances 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 239000000654 additive Substances 0.000 claims abstract description 12
- 230000029087 digestion Effects 0.000 claims abstract description 10
- 238000003756 stirring Methods 0.000 claims abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 238000012216 screening Methods 0.000 claims abstract description 7
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 5
- 230000002431 foraging effect Effects 0.000 claims abstract description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 33
- 239000002893 slag Substances 0.000 claims description 23
- 239000010802 sludge Substances 0.000 claims description 22
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 20
- 239000000758 substrate Substances 0.000 claims description 20
- 239000002994 raw material Substances 0.000 claims description 15
- 239000013049 sediment Substances 0.000 claims description 15
- 239000004115 Sodium Silicate Substances 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 239000010440 gypsum Substances 0.000 claims description 11
- 229910052602 gypsum Inorganic materials 0.000 claims description 11
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 11
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 11
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 11
- 239000000292 calcium oxide Substances 0.000 claims description 10
- 235000012255 calcium oxide Nutrition 0.000 claims description 10
- 230000032683 aging Effects 0.000 claims description 9
- 238000010276 construction Methods 0.000 claims description 9
- 239000008394 flocculating agent Substances 0.000 claims description 9
- 239000010881 fly ash Substances 0.000 claims description 9
- 230000000996 additive effect Effects 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 8
- 239000004567 concrete Substances 0.000 claims description 7
- 239000000126 substance Substances 0.000 claims description 7
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 6
- 239000000920 calcium hydroxide Substances 0.000 claims description 6
- 235000011116 calcium hydroxide Nutrition 0.000 claims description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims description 6
- 239000004927 clay Substances 0.000 claims description 6
- 230000035484 reaction time Effects 0.000 claims description 6
- 239000002956 ash Substances 0.000 claims description 5
- 239000003245 coal Substances 0.000 claims description 5
- 230000018044 dehydration Effects 0.000 claims description 5
- 238000006297 dehydration reaction Methods 0.000 claims description 5
- 238000003860 storage Methods 0.000 claims description 5
- 235000019738 Limestone Nutrition 0.000 claims description 3
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 claims description 3
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 3
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000002253 acid Substances 0.000 claims description 3
- 238000001125 extrusion Methods 0.000 claims description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 3
- 239000006028 limestone Substances 0.000 claims description 3
- 235000010755 mineral Nutrition 0.000 claims description 3
- 239000011707 mineral Substances 0.000 claims description 3
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 3
- 238000004062 sedimentation Methods 0.000 claims description 3
- 235000019794 sodium silicate Nutrition 0.000 claims description 3
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 3
- 235000011152 sodium sulphate Nutrition 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 229920000592 inorganic polymer Polymers 0.000 claims 1
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000005245 sintering Methods 0.000 abstract description 4
- 238000000465 moulding Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000010998 test method Methods 0.000 description 9
- 239000000047 product Substances 0.000 description 6
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 4
- 239000011575 calcium Substances 0.000 description 4
- 229910052791 calcium Inorganic materials 0.000 description 4
- 230000006835 compression Effects 0.000 description 3
- 238000007906 compression Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000012190 activator Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000003306 harvesting Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000002910 solid waste Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011469 building brick Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010494 dissociation reaction Methods 0.000 description 1
- 230000005593 dissociations Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
Classifications
-
- 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
- C04B30/00—Compositions for artificial stone, not containing binders
-
- 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
-
- 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
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Treatment Of Sludge (AREA)
Abstract
The invention relates to a river and lake dredging bottom mud brick and a preparation method thereof. And (3) after the dewatered mud cake enters a crusher to be crushed, screening out a bottom mud matrix through a screen, conveying the bottom mud matrix to a mixing bin, adding a water reducing agent to be uniformly mixed, and then uniformly stirring the mixture with industrial waste residues, calcareous additives, building wastes, exciting agents and other materials. The mixed materials are conveyed to a digestion bin for aging. And pressing and molding the aged mixture under pressure by a brick making machine. And preparing the green brick into a finished product of the bottom mud brick through a low-temperature hydrothermal reaction. The method can treat and utilize river and lake bottom mud in different regions, including yard-stockpiled bottom mud, avoids sintering and long-time maintenance, and can generate good social environment and economic benefits.
Description
Technical Field
The invention relates to a river and lake dredging bottom mud brick and a preparation method thereof, belonging to the technical field of river and lake bottom mud resource treatment.
Background
By dredging the bottom mud of the river and lake, on one hand, a port can be newly built and maintained, the passing condition of a channel is improved, and on the other hand, the flood control and waterlogging prevention functions of the river and lake can be enhanced while the water environment is rectified, so that the dredging is undoubtedly an important part in the harbour construction, the shipping passage, the urban flood control and the treatment of odorous water bodies. In recent years, the amount of dredging sediment has been increasing year by year due to the great development of the domestic dredging industry. The traditional disposal mode mainly comprises the steps of filling, mud throwing and burning, and certain environmental hazard and resource waste can be brought.
At present, the resource treatment method of river and lake dredging bottom mud comprises the directions of soil utilization, building material utilization, filling material utilization, energy recovery, sewage treatment material preparation and the like. The utilization of the soil has high requirements on the property and the components of the bottom mud, and needs to be adapted to local conditions, so that if the soil is not properly treated, not only the waste of land resources but also the harm to human health can be caused. The filling material needs to solidify the bottom mud, so that the bottom mud meets the engineering requirements, and the utilization is limited by regions. The utilization amount of the bottom mud for energy recovery and sewage treatment material preparation is relatively low, and the requirements on the utilization conditions are high.
In contrast, the admission conditions for building material utilization of the bottom mud are looser, the limited aspects are fewer, and the utilization amount is larger. Because the property components of the bottom mud are close to those of the clay, the raw material conditions are provided for preparing bricks from the bottom mud. The traditional brick making method utilizes a sintering process in a brick kiln, has the defects of high energy consumption, serious pollution and no low-carbon requirement, and thus cannot be mainly used as bottom mud. The preparation method of the baking-free curing-molded bottom mud brick uses cement to improve the strength, needs long-time constant-temperature and constant-humidity curing, and the compression resistance of the finished product generally does not meet the low-carbon and environment-friendly requirements.
In consideration of the nearly saturation of the bottom sediment storage yard and the quantity of the bottom sediment, the exploration of a bottom sediment resource utilization method which is high in bottom sediment utilization rate, relatively energy-saving and environment-friendly is particularly important.
Disclosure of Invention
The purpose of the invention is as follows: in view of the existing problems and disadvantages, the present invention aims to provide a brick for dredging bottom mud of rivers and lakes and a preparation method thereof, which can treat and utilize bottom mud of rivers and lakes including yard piled-up bottom mud in different regions, and provide a preparation method of the brick for dredging bottom mud of rivers and lakes, can avoid sintering and long-time maintenance, can utilize the bottom mud of rivers and lakes in large quantity, improve the added value thereof, and can generate good social environment and economic benefits.
The technical scheme is as follows: in order to realize the purpose of the invention, the invention adopts the following technical scheme:
a river and lake dredging bottom mud brick comprises the following raw material formula: the composite material comprises a substrate sludge matrix, industrial waste residues, a calcareous additive, building wastes, an excitant, a water reducer and a flocculant, wherein the raw materials comprise the following components in parts by weight: 50-70 parts of bottom mud matrix, 8-16 parts of industrial waste residue, 8-16 parts of calcareous additive, 0-5 parts of construction waste, 0.7-1.1 parts of excitant and 0-0.3 part of water reducer.
Further, the raw material formula also comprises 0 to 0.1 part of flocculating agent.
Further, the substrate sludge matrix is substrate sludge obtained by dredging in rivers and lakes or substrate sludge partially dehydrated in a substrate sludge yard; the industrial waste residue and waste residue is one or a combination of more of mineral powder, coal gangue, fly ash, steel slag, carbide slag and shale ash.
Further, the calcareous additive is one or more of lime, limestone, slaked lime, gypsum and carbide slag.
Furthermore, the construction waste is a waste material with silicate substances as main components, and comprises waste concrete, waste red bricks and waste clay bricks, and the particle size of the waste concrete, the waste red bricks and the waste clay bricks is less than or equal to 8mm.
Further, the activator is one or more of sodium hydroxide, sodium silicate, sodium sulfate and calcium hydroxide.
Further, the water reducing agent is a polycarboxylic acid water reducing agent or a naphthalene water reducing agent.
Further, the flocculant is an inorganic polymeric flocculant.
Further, the raw materials comprise the following components in parts by weight: 62 parts of bottom mud matrix, 15 parts of S95 slag, 5 parts of fly ash, 5 parts of carbide slag, 10 parts of quick lime, 2 parts of gypsum, 0.3 part of sodium hydroxide, 0.6 part of sodium silicate and 0.1 part of water reducing agent.
The preparation method of the sludge brick at the bottom of the river and lake dredging comprises the following steps:
step 1: and (3) dehydrating bottom mud: dredging sediment, adding a flocculating agent for sedimentation after dredging is finished, conveying the sediment to a mechanical device for dehydration to be less than 55%, standing, stacking and naturally airing until the water content is reduced to 30-50%;
step 2: mixing materials: after the dehydrated mud cake enters a crusher to be crushed, screening out a bottom mud matrix with the particle size of less than or equal to 3mm through a screen, conveying the bottom mud matrix to a mixing bin, adding a water reducing agent to be uniformly mixed, and then uniformly stirring the bottom mud matrix with materials such as industrial waste residue, calcareous additives, building wastes, exciting agents and the like;
and step 3: digestion and aging: conveying the mixed material to a digestion bin for aging for 1 to 7 days, and turning over once every 24 hours;
and 4, step 4: extrusion molding: pressing the aged mixture for 1 to 2 minutes under the pressure of 50 to 200KN by a brick making machine to form the mixture;
and 5: low-temperature hydrothermal reaction: and carrying out low-temperature hydrothermal reaction on the green brick at the temperature of 120-220 ℃, the pressure of the reaction environment of 0.2-2.5 MPa and the reaction time of 6-1693 h to prepare the finished product of the bottom mud brick.
Has the advantages that: compared with the prior art, the invention is a novel river and lake dredging bottom mud brick and a preparation method thereof, and the invention has the following advantages: the method can be applied to the sediment directly dug by dredging rivers and lakes, and can save energy, reduce emission, reduce carbon dioxide emission and avoid solid waste by adopting a non-sintering technology. Long-time steam curing is not needed after the reaction is finished, and the cost is reduced. The prepared finished brick has good compression resistance, can be used as a masonry material, can realize resource utilization of wastes, and can bring certain social and economic benefits.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary and are not intended to limit the scope of the invention, as various equivalent modifications of the invention will occur to those skilled in the art upon reading the present disclosure and fall within the scope of the appended claims.
The raw material formula of the river and lake dredging bottom mud brick comprises: 50-70 parts of bottom mud matrix, 8-16 parts of industrial waste residue, 8-16 parts of calcareous additive, 0-5 parts of construction waste, 0.7-1.1 parts of excitant, 0-0.3 part of water reducer and 0-0.1 part of flocculant.
The substrate sludge can be obtained by directly dredging in river channels or lakes, or can be partially dehydrated in a substrate sludge storage yard, and the substrate sludge in the storage yard can be directly utilized.
The industrial waste residue is one or more selected from mineral powder, coal gangue, fly ash, steel slag, carbide slag, shale ash and the like. The industrial waste residue is selected to be capable of consuming and treating a certain amount of industrial solid waste on one hand, and on the other hand, the material composition of partial waste residue contains a large amount of silicon, calcium, aluminum and other elements, and the substances can be dissolved out and react under the hydrothermal condition to generate the substances for providing the strength of the bottom mud brick.
The construction waste is selected from the group including but not limited to waste concrete, waste red brick, waste clay brick, etc. On one hand, the resource utilization of the construction waste can be realized, and on the other hand, the construction waste can be used as aggregate to increase the strength.
The calcareous additive is one or more selected from quicklime, limestone, slaked lime, gypsum and carbide slag. The purpose of adding the calcium raw material is to provide a calcium source and a substrate sludge main substance component to react to generate a strength substance and provide an alkaline environment to promote the reaction generation.
The activator is one or more of sodium hydroxide, sodium silicate, sodium sulfate and calcium hydroxide. The excitant can promote hydration to generate, accelerate the dissociation of calcium, magnesium and other ions, reduce the structural stability of silicon oxide in the bottom mud component, and depolymerize so as to react with other components to generate various silicate substances. Can accelerate the hardening of the mixture, make the structure more compact and enhance the strength and the corrosion resistance of the bottom mud brick.
The water reducing agent is a polycarboxylic acid water reducing agent or a naphthalene water reducing agent, and can enhance the fluidity of materials so as to be mixed uniformly and improve the plasticity so as to be formed better.
The flocculant is an inorganic polymeric flocculant, and has the mechanism effects of adsorption and electric neutralization, adsorption bridging, double electric layer compression, precipitate net catching and the like, so that suspended sediment in water is destabilized and settled for dewatering.
The preparation method of the river and lake desilting bottom mud brick comprises the following steps:
step 1: and (3) dehydrating bottom mud: dredging sediment, adding a flocculating agent for sedimentation after dredging is finished, conveying the sediment to a mechanical device for dehydration to be less than 55%, standing, stacking and naturally airing until the water content is reduced to 30-50%;
step 2: mixing materials: after the dehydrated mud cake enters a crusher to be crushed, screening out a bottom mud matrix with the particle size of less than or equal to 3mm through a screen, conveying the bottom mud matrix to a mixing bin, adding a water reducing agent to be uniformly mixed, and then uniformly stirring the bottom mud matrix with materials such as industrial waste residue, calcareous additives, building wastes, exciting agents and the like;
and 3, step 3: digestion and aging: conveying the mixed material to a digestion bin for aging for 1 to 7 days, and turning over once every 24 hours;
and 4, step 4: extrusion molding: pressing the aged mixture for 1 to 2 minutes under the pressure of 50 to 200KN by a brick making machine to form the mixture;
and 5: and (3) low-temperature hydrothermal reaction: and carrying out low-temperature hydrothermal reaction on the green brick at the temperature of 120-220 ℃, the pressure of the reaction environment of 0.2-2.5 MPa and the reaction time of 6-1693 h to prepare the finished product of the bottom mud brick.
Example 1
The river and lake dredging bottom mud brick comprises the following raw materials in parts by mass: 62 parts of bottom mud matrix, 15 parts of S95 slag, 4 parts of fly ash, 4 parts of carbide slag, 2 parts of waste red brick, 10 parts of quicklime, 2 parts of gypsum, 0.1 part of water reducing agent, 0.3 part of sodium hydroxide and 0.6 part of sodium silicate. Wherein the substrate sludge is dehydrated in a certain dredging project yard of the Tianmu lake without further dehydration, and the water content is 38 percent (+/-2.5 percent).
A preparation method of a river and lake dredging bottom mud brick comprises the following steps:
step one, dehydrating bottom mud, wherein the water content of the bottom mud in the storage yard is lower than 45 percent, so that the bottom mud can be directly utilized;
secondly, crushing and mixing the materials, namely crushing a mud cake in a crusher, screening out a bottom mud matrix with the particle size of less than or equal to 3mm through a screen, conveying the bottom mud matrix to a mixing bin, adding a water reducing agent, stirring and mixing uniformly, and then adding S95 slag, fly ash, carbide slag, waste red bricks, quicklime, gypsum, sodium hydroxide and sodium silicate into the mixture, stirring and mixing uniformly;
ageing and digesting, conveying the mixed material to a digestion chamber, carrying out semi-sealed ageing for 6 +/-1 days at room temperature, and turning over once every 24 hours;
extruding and forming, namely pressing the aged brick blank into a green brick through a mold with the thickness of 240mm multiplied by 115mm multiplied by 53mm under the pressure of 200KN, and forming and demolding after 2 minutes;
and step five, performing hydrothermal reaction, namely allowing the green brick to enter a reaction kettle for low-temperature hydrothermal reaction, and taking the green brick out of the kettle and cooling the green brick under the conditions that the temperature is 180 ℃, the pressure of the reaction environment is 1MPa and the reaction time is 6 hours to obtain a finished product of the bottom mud brick.
According to the sample compressive strength test method, referring to the compressive strength test method in GB/T2541-2012 'wall brick test method', the average compressive strength of the bottom mud brick is 31.2MPa, the bending strength is 5.6MPa, and the density is 1.689T/m for carrying out heavy cultivation.
Example 2
The river and lake dredging bottom mud brick comprises the following raw materials in parts by mass: 63 parts of bottom mud matrix, 0.1 part of flocculating agent, 15 parts of S95 slag, 2 parts of coal gangue, 4 parts of carbide slag, 3 parts of waste concrete, 10 parts of quicklime, 2 parts of gypsum, 0.3 part of sodium hydroxide and 0.6 part of sodium silicate. Wherein the substrate sludge is substrate sludge of certain places of the Taihu lake, and the water content is more than 90 percent.
A preparation method of a river and lake dredging bottom mud brick comprises the following steps:
step one, dehydrating the bottom sludge, digging out the bottom sludge from the lake bottom, adding a flocculating agent for settling, and dehydrating through a plate-and-frame filter press to reduce the water content of the bottom sludge to 42 percent (+/-2.5 percent);
secondly, crushing and mixing the materials, namely, after the mud cakes are firstly crushed in a crusher, screening out a bottom mud matrix with the particle size of less than or equal to 3mm through a screen, conveying the bottom mud matrix to a mixing bin, and adding S95 slag, coal gangue, carbide slag, waste concrete, quicklime, gypsum, sodium hydroxide and sodium silicate into the bottom mud matrix for stirring and uniformly mixing;
ageing and digesting, conveying the mixed material to a digestion chamber for semi-sealing ageing for 3 +/-1 days at room temperature, and turning over once every 24 hours;
extruding and forming, namely pressing the aged brick blank into a green brick through a mold with the thickness of 240mm multiplied by 115mm multiplied by 53mm under the pressure of 150KN, and forming and demolding after 2 minutes;
and step five, performing hydrothermal reaction, namely allowing the green brick to enter a reaction kettle for low-temperature hydrothermal reaction, and taking the green brick out of the kettle and cooling the green brick under the conditions that the temperature is 160 ℃, the pressure of the reaction environment is 0.62MPa and the reaction time is 8 hours to obtain a finished product of the bottom mud brick.
The sample compressive strength test method refers to a compressive strength test method in GB/T2541-2012 'test method for wall bricks', the average compressive strength of the mud bricks is 25.6MPa, the breaking strength is 4.8MPa, and the density is 1.646T/m for harvesting.
Example 3
The river and lake dredging bottom mud brick comprises the following raw materials in parts by mass: 60 parts of bottom mud matrix, 0.1 part of flocculant, 14 parts of S95 slag, 6 parts of fly ash, 6 parts of shale ash, 11 parts of quicklime, 2 parts of gypsum, 0.1 part of water reducing agent, 0.3 part of sodium hydroxide and 0.5 part of sodium silicate. Wherein the substrate sludge is substrate sludge obtained by dredging a river channel in Ningbo certain place, and the water content is more than 90 percent.
A preparation method of a river and lake dredging bottom mud brick comprises the following steps:
step one, dehydrating bottom mud, digging out the bottom mud from the lake bottom, adding a flocculating agent for settling, dehydrating through a plate-and-frame filter press, further standing, stacking and naturally airing until the water content is reduced to 38% (+/-2.5%); (ii) a
Crushing and mixing the materials, namely crushing a mud cake in a crusher, screening out a bottom mud matrix with the particle size of less than or equal to 3mm through a screen, conveying the bottom mud matrix to a mixing bin, adding a water reducing agent, stirring and mixing uniformly, and then adding S95 slag, fly ash, shale ash, quicklime, gypsum, sodium hydroxide and sodium silicate into the mixture, stirring and mixing uniformly;
ageing and digesting, conveying the mixed material to a digestion chamber for semi-sealing ageing for 4 (+ -1) days at room temperature, and turning over once every 24 hours;
extruding and molding, namely pressing the aged mixture into a green brick by a mold with the thickness of 240mm, 115mm and 53mm under the pressure of 100KN, and molding and demolding after 2 minutes;
and step five, performing hydrothermal reaction, namely allowing the green bricks to enter a reaction kettle for low-temperature hydrothermal reaction, and taking the green bricks out of the kettle and cooling the green bricks under the conditions of the temperature of 180 ℃, the pressure of the reaction environment of 1MPa and the reaction time of 6 hours to obtain the finished product bottom mud bricks.
According to the sample compressive strength test method, referring to a compressive strength test method in GB/T2541-2012 'test method for wall building bricks', the average compressive strength of the bottom mud bricks is 26.3MPa, the breaking strength is 5.1MPa, and the density is 1.601T/m for carrying out the harvesting.
The performances of examples 1 to 3 were tested to obtain the following results shown in Table 1:
TABLE 1
The compressive strength of a common mud brick is 11.28 MPa, the breaking strength is 2.58 MPa, the density is 1.580t/m, and compared with examples 1 to 3, the mud brick obtained in the invention has better performance than the common mud brick, and the used raw materials are environment-friendly and easy to obtain, thereby being beneficial to recycling.
Claims (10)
1. The utility model provides a sediment brick at bottom of river lake desilting which characterized in that: the raw material formula comprises: the sediment comprises a substrate, industrial waste residues, a calcareous additive, building wastes, an excitant, a water reducing agent and a flocculating agent, wherein the substrate comprises the following raw material components in parts by weight: 50-70 parts of bottom mud matrix, 8-16 parts of industrial waste residue, 8-16 parts of calcareous additive, 0-5 parts of construction waste, 0.7-1.1 parts of excitant and 0-0.3 part of water reducer.
2. A river and lake dredging bottom mud brick according to claim 1, characterized in that: the raw material formula also comprises 0 to 0.1 portion of flocculating agent.
3. A river and lake dredging bottom mud brick as claimed in claim 1, wherein: the substrate sludge matrix is substrate sludge obtained by dredging in rivers and lakes or substrate sludge subjected to partial dehydration in a substrate sludge storage yard; the industrial waste residue and waste residue is one or a combination of more of mineral powder, coal gangue, fly ash, steel slag, carbide slag and shale ash.
4. A river and lake dredging bottom mud brick according to claim 1, characterized in that: the calcareous additive is one or a combination of more of quicklime, limestone, slaked lime, gypsum and carbide slag.
5. A river and lake dredging bottom mud brick according to claim 1, characterized in that: the construction waste is a waste material mainly containing silicate substances, and comprises waste concrete, waste red bricks and waste clay bricks, wherein the particle size of the waste concrete, the waste red bricks and the waste clay bricks is less than or equal to 8mm.
6. A river and lake dredging bottom mud brick according to claim 1, characterized in that: the exciting agent is one or a combination of more of sodium hydroxide, sodium silicate, sodium sulfate and calcium hydroxide.
7. A river and lake dredging bottom mud brick according to claim 1, characterized in that: the water reducing agent is a polycarboxylic acid water reducing agent or a naphthalene water reducing agent.
8. A river and lake dredging bottom mud brick according to claim 1, characterized in that: the flocculant is an inorganic polymer flocculant.
9. A river and lake dredging bottom mud brick according to claim 1, characterized in that: the weight parts of the raw materials are as follows: 62 parts of bottom mud matrix, 15 parts of S95 slag, 5 parts of fly ash, 5 parts of carbide slag, 10 parts of quick lime, 2 parts of gypsum, 0.3 part of sodium hydroxide, 0.6 part of sodium silicate and 0.1 part of water reducer.
10. The method for preparing the river and lake desilting bottom mud brick of claims 1 to 7 is characterized by comprising the following steps: the method comprises the following steps:
step 1: dewatering bottom mud: dredging sediment, adding a flocculating agent for sedimentation after dredging is finished, conveying the sediment to a mechanical device for dehydration to be less than 55%, standing, stacking and naturally airing until the water content is reduced to 30-50%;
step 2: mixing materials: after the dehydrated mud cake enters a crusher to be crushed, screening out a bottom mud matrix with the particle size of less than or equal to 3mm through a screen, conveying the bottom mud matrix to a mixing bin, adding a water reducing agent to be uniformly mixed, and then uniformly stirring the bottom mud matrix with materials such as industrial waste residue, calcareous additives, building wastes, exciting agents and the like;
and step 3: digestion and aging: conveying the mixed material to a digestion bin for aging for 1 to 7 days, and turning over once every 24 hours;
and 4, step 4: extrusion molding: pressing the aged mixture for 1 to 2 minutes under the pressure of 50 to 200KN by a brick making machine to form the mixture;
and 5: and (3) low-temperature hydrothermal reaction: and carrying out low-temperature hydrothermal reaction on the green brick at the temperature of 120-220 ℃, the pressure of the reaction environment of 0.2-2.5 MPa and the reaction time of 6-1693 h to prepare the finished product of the bottom mud brick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211061645.7A CN115536357A (en) | 2022-09-01 | 2022-09-01 | River and lake dredging bottom mud brick and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211061645.7A CN115536357A (en) | 2022-09-01 | 2022-09-01 | River and lake dredging bottom mud brick and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115536357A true CN115536357A (en) | 2022-12-30 |
Family
ID=84724910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211061645.7A Pending CN115536357A (en) | 2022-09-01 | 2022-09-01 | River and lake dredging bottom mud brick and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115536357A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117700191A (en) * | 2023-12-13 | 2024-03-15 | 河海大学 | Baking-free brick of full solid waste system based on waste slurry and preparation method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104177015A (en) * | 2014-08-21 | 2014-12-03 | 中交天航环保工程有限公司 | Baking-free brick mainly prepared from river/lake dredging sediment and natural-curing manufacturing method thereof |
| CN110624932A (en) * | 2019-09-11 | 2019-12-31 | 上海海顾新材料科技有限公司 | River, lake and reservoir bottom mud building material treatment system and treatment method |
| CN110759700A (en) * | 2019-10-14 | 2020-02-07 | 上海同臣环保有限公司 | Treatment process for preparing building material from river and lake sludge without baking |
-
2022
- 2022-09-01 CN CN202211061645.7A patent/CN115536357A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104177015A (en) * | 2014-08-21 | 2014-12-03 | 中交天航环保工程有限公司 | Baking-free brick mainly prepared from river/lake dredging sediment and natural-curing manufacturing method thereof |
| CN110624932A (en) * | 2019-09-11 | 2019-12-31 | 上海海顾新材料科技有限公司 | River, lake and reservoir bottom mud building material treatment system and treatment method |
| CN110759700A (en) * | 2019-10-14 | 2020-02-07 | 上海同臣环保有限公司 | Treatment process for preparing building material from river and lake sludge without baking |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117700191A (en) * | 2023-12-13 | 2024-03-15 | 河海大学 | Baking-free brick of full solid waste system based on waste slurry and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107337414B (en) | Carbonized baking-free brick prepared from marine waste sludge and preparation method thereof | |
| CN107721270B (en) | Method for preparing non-sintered water permeable brick by using municipal sludge | |
| CN102070309B (en) | Method for preparing hydraulic calcium oxide through papermaking alkali recycling causticized white sludge | |
| WO2021219058A1 (en) | Recycled material floor tile and preparation method therefor | |
| CN113213789B (en) | Paving brick prepared based on household garbage incineration fly ash and preparation method thereof | |
| CN102424511A (en) | Solidification treatment method for sludge of urban sewage plant | |
| CN113149525A (en) | Coal ash and red mud geopolymer material and preparation method thereof | |
| CN101805161B (en) | Baking-free brick cementing agent prepared from drilling solid waste | |
| CN104177015A (en) | Baking-free brick mainly prepared from river/lake dredging sediment and natural-curing manufacturing method thereof | |
| CN102206073A (en) | Slit burning-free bricks and production method thereof | |
| CN112142377A (en) | Concrete processing technology doped with waste concrete blocks | |
| CN102992726A (en) | Burn-free ceramsite | |
| CN109293313B (en) | Sludge brick and preparation process thereof | |
| CN102320801A (en) | Method for producing braking-free brick from red mud and magnesium slag used as main materials by press shaping | |
| CN115536357A (en) | River and lake dredging bottom mud brick and preparation method thereof | |
| CN103964786A (en) | Method for producing calcium silicate board by utilizing papermaking white clay and quartz stone wastes | |
| CN113735550B (en) | Magnesium oxychloride cement-based muck non-fired building material and preparation method thereof | |
| CN101343149B (en) | Sewage water body refuse type cement and method of preparing the same | |
| CN102070322B (en) | Method for preparing high-strength ceramic wall material from papermaking causticized white mud residues | |
| CN111559896A (en) | Foaming phosphogypsum building block and preparation method thereof | |
| CN111268971A (en) | Modified concrete brick containing sludge gasification dry distillation residues and preparation method thereof | |
| CN107285727B (en) | Baking-free water permeable brick prepared from waste slag soil and preparation process thereof | |
| CN114044640B (en) | Double-component sludge-based non-fired cementing material and preparation method and application thereof | |
| CN108585751A (en) | A method of using the low-quality coal ash for manufacturing of high ferro for high-strength water-permeable concrete | |
| CN1291940C (en) | Method of preparing high-strength silicate wall material by utilizing chemical white sludge |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20221230 |
|
| RJ01 | Rejection of invention patent application after publication |