CN117285230A - Device for pneumatic mixed flow solidification of dredged soil and slurry preparation method - Google Patents
Device for pneumatic mixed flow solidification of dredged soil and slurry preparation method Download PDFInfo
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- CN117285230A CN117285230A CN202311427850.5A CN202311427850A CN117285230A CN 117285230 A CN117285230 A CN 117285230A CN 202311427850 A CN202311427850 A CN 202311427850A CN 117285230 A CN117285230 A CN 117285230A
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- 239000002689 soil Substances 0.000 title claims abstract description 132
- 239000002002 slurry Substances 0.000 title claims abstract description 37
- 238000007711 solidification Methods 0.000 title claims abstract description 37
- 230000008023 solidification Effects 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 86
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 66
- 239000007788 liquid Substances 0.000 claims abstract description 57
- 238000002156 mixing Methods 0.000 claims abstract description 53
- 239000000463 material Substances 0.000 claims abstract description 50
- 239000000843 powder Substances 0.000 claims abstract description 21
- 239000003153 chemical reaction reagent Substances 0.000 claims abstract description 18
- 238000003756 stirring Methods 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 5
- 238000000034 method Methods 0.000 claims description 16
- 239000002270 dispersing agent Substances 0.000 claims description 14
- 238000002161 passivation Methods 0.000 claims description 14
- 239000004576 sand Substances 0.000 claims description 12
- 238000000926 separation method Methods 0.000 claims description 12
- 229910001385 heavy metal Inorganic materials 0.000 claims description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 9
- 239000004571 lime Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 7
- 239000004568 cement Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000003814 drug Substances 0.000 claims description 5
- 229910052751 metal Inorganic materials 0.000 claims description 5
- 239000002184 metal Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 3
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 239000008394 flocculating agent Substances 0.000 claims description 3
- 229920003023 plastic Polymers 0.000 claims description 3
- 239000004033 plastic Substances 0.000 claims description 3
- 229920002401 polyacrylamide Polymers 0.000 claims description 3
- 229920001228 polyisocyanate Polymers 0.000 claims description 3
- 239000005056 polyisocyanate Substances 0.000 claims description 3
- 239000004814 polyurethane Substances 0.000 claims description 3
- 229920002635 polyurethane Polymers 0.000 claims description 3
- 229920000036 polyvinylpyrrolidone Polymers 0.000 claims description 3
- 239000001267 polyvinylpyrrolidone Substances 0.000 claims description 3
- 235000013855 polyvinylpyrrolidone Nutrition 0.000 claims description 3
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 claims description 3
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 claims description 3
- 239000011268 mixed slurry Substances 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000013049 sediment Substances 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000013019 agitation Methods 0.000 description 1
- 229910000323 aluminium silicate Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011499 joint compound Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/148—Combined use of inorganic and organic substances, being added in the same treatment step
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
-
- 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)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Treatment Of Sludge (AREA)
Abstract
The application discloses a device for dredging soil pneumatic mixed flow solidification relates to ecological environmental protection technical field, especially relates to a device for dredging soil pneumatic mixed flow solidification and a slurry preparation method, which comprises: the dredging soil mud storage tank, the pressure pump, the water content tester, the first stirrer, the mixing pipe and the solidified mud storage tank are connected in sequence through pipelines; the first material conveying device is used for outputting water or flocculant to the first stirrer according to the measurement result of the water content tester, stirring the dredged soil and the water or flocculant through the first stirrer, and outputting the stirred dredged soil and the water or flocculant to the mixing pipe; the second material conveying device is connected with the mixing pipe and is used for outputting a liquid curing agent, a powder curing agent and a liquid reagent to the mixing pipe so as to prepare slurry with proper water content and viscosity, which is suitable for pneumatic mixed flow curing of dredged soil, the water content and viscosity of the mixed flow curing slurry in the pipe are controlled, the consumption of the curing agent is reduced, the curing strength of the mixed slurry is improved, and the loss and the curing cost of equipment are reduced.
Description
Technical Field
The application relates to the technical field of ecological environmental protection, in particular to a device for pneumatic mixed flow solidification of dredged soil and a slurry preparation method.
Background
Dredged soil is a sediment dug under water in the construction and later maintenance processes of ocean ports and channels, and mainly comprises mud, sand, stones, organic matters, biological residues and the like. With the capacity of an open sea mud throwing field becoming saturated in recent years, a large amount of dredged soil faces the dilemma that cannot be disposed of, and meanwhile, if the dredged soil is only used as waste to be thrown outwards, secondary pollution of surrounding environment and water resources can be caused, and huge waste of soil resources can be caused. The dredging sediment mainly uses inorganic minerals such as aluminosilicate and the like as main components, is rich in organic matters and nutrient salts with higher content, and has high resource utilization value. The dredging soil is treated by adopting a certain method and measures to convert the dredging soil into reusable resources, including agriculture and product utilization, engineering utilization and environment improvement utilization, and the pollution of external throwing to the environment and the waste of the resources can be effectively reduced, so that direct or indirect economic benefits are generated.
Aiming at dredging mud solidification, a scholars put forward a high-efficiency treatment technology, namely a pneumatic mixed flow solidification treatment technology, namely, a proper amount of solidifying agent is injected in the way of conveying a dredging soil pipeline, meanwhile compressed air is input, the dredging soil and the solidifying agent are in a vortex shape and roll forward in a pipe under the driving of proper pressure air flow, and the solidifying soil is uniformly mixed and does not occupy a place and can be directly conveyed to a site to be filled. The dredging soil resources in China are very rich, and if the curing treatment and the utilization of the dredging soil can be developed, the curing utilization of the dredging soil and the efficiency and the benefit of changing waste into valuable can be greatly improved.
The key point of pneumatic mixed flow solidification technology is the flow and mixing of slurry in the pipeline, so the state of slurry pumped through the pipeline is a major issue of technical considerations. If the water content of the slurry pumped in the pipeline is too low and the viscosity of the slurry is high, the slurry is difficult to convey in the pipeline, the compressed air is difficult to cut the slurry, and the slurry cannot be mixed with the curing agent; if the water content of the slurry pumped in the pipeline is large, the slurry is convenient to convey and cut in the pipeline, but more curing agent is needed to be added, so that the cost of pneumatic mixed flow curing is increased, and the mixed slurry is difficult to reach the expected strength.
Therefore, a slurry preparation method needs to be developed, the water content and the viscosity of mixed flow solidified slurry in a pipe are controlled, the consumption of a curing agent is reduced, the solidification strength of the mixed slurry is improved, and the cost reduction and the synergy are realized.
Disclosure of Invention
The invention aims to avoid the defects in the prior art and provide a technology capable of controlling the water content and viscosity of mixed flow solidified slurry in a pipe, reducing the dosage of a solidifying agent and improving the solidification strength of the mixed slurry.
The aim of the invention is achieved by the following technical scheme:
an apparatus for pneumatic mixed flow solidification of dredged earth, comprising: the device comprises a dredging soil mud storage tank, a pressure pump, a water content tester, a first stirrer, a mixing pipe, a solidified mud storage tank, a first conveying device and a second conveying device; the dredging soil mud storage pool, the pressure pump, the water content tester, the first stirrer, the mixing pipe and the solidified mud storage pool are connected through pipelines in sequence; the pressure pump is used for pumping the dredged soil out of the dredged soil storage tank; the water content tester is used for measuring the water content of the dredged soil; the first material conveying device is used for outputting water or flocculant to the first stirrer according to the measurement result of the water content tester, stirring the dredged soil and the water or flocculant through the first stirrer, and outputting the stirred dredged soil and the water or flocculant to the mixing pipe; the second material conveying device is connected with the mixing pipe and is used for outputting a liquid curing agent, a powder curing agent and a liquid reagent to the mixing pipe; the mixing pipe is used for mixing the dredged soil with the liquid curing agent, the powder curing agent and the liquid reagent and then outputting the mixture to the curing mud storage tank.
Specifically, the liquid curing agent is polyurethane, the powder curing agent is cement and lime, and the liquid agent is polyisocyanate.
The first material conveying device comprises a first bin and a first material conveying pipe connected with the first bin, and a first flowmeter is arranged on the first material conveying pipe; the first bin is used for storing water and/or flocculant; the flocculant is polyacrylamide or sodium carboxymethyl cellulose.
In another embodiment, the second feeding device includes: the second bin, the third bin, the fourth bin, the second conveying pipe, the third conveying pipe and the fourth conveying pipe; the second bin, the third bin and the fourth bin are respectively connected with one ends of a second conveying pipe, a third conveying pipe and a fourth conveying pipe, and the other ends of the second conveying pipe, the third conveying pipe and the fourth conveying pipe are respectively connected with a mixing pipe; the second bin, the third bin and the fourth bin are respectively used for storing a liquid curing agent, a powder curing agent and a liquid reagent; the second conveying pipe, the third conveying pipe and the fourth conveying pipe are respectively provided with a second flowmeter, a third flowmeter and a fourth flowmeter.
The device also comprises a third material conveying device; a vibrating screen, a second stirrer and a cyclone separator are also arranged between the pressure pump and the water content tester; the pressure pump, the vibrating screen, the second stirrer, the cyclone separator and the water content tester are connected through pipelines in sequence; the vibrating screen is used for carrying out garbage separation on the dredged soil output by the pressure pump; the third material conveying device is used for inputting a dispersing agent into the second stirrer and mixing dredged soil and the dispersing agent through the second stirrer; the cyclone separator is used for separating slurry from sand particles of the dredged soil mixed by the second stirrer.
Further, the third material conveying device comprises a fifth bin and a fifth material conveying pipe connected with the fifth bin, and a fifth flowmeter is arranged on the fifth material conveying pipe; the fifth bin is used for storing the dispersing agent; the dispersing agent is polyvinylpyrrolidone or sodium dodecyl sulfate; the vibrating power of the vibrating screen is 900r/min, the size of the screen holes is 10-30 mm, the amplitude is 8mm, and the inclination of the screen surface is 4 degrees.
The device also comprises a fourth material conveying device; a third stirrer is arranged between the pressure pump and the vibrating screen; the pressure pump, the third stirrer and the vibrating screen are connected in sequence; the fourth material conveying device is used for inputting a metal passivation agent and/or water accounting for 30% of the mass fraction of the dredged soil into the third stirrer and mixing the dredged soil with the water and/or the heavy metal passivation agent through the third stirrer.
More specifically, the fourth material conveying device comprises a sixth feed bin and a sixth material conveying pipe connected with the sixth feed bin, and a sixth flowmeter is arranged on the sixth material conveying pipe; the sixth bin is used for storing water and/or heavy metal passivation medicaments; the heavy metal passivation agent is biochar or lime, and the dosage of the agent is 5%.
The preparation method of the slurry for the pneumatic mixed flow solidification of the dredged soil is applied to the device for the pneumatic mixed flow solidification of the dredged soil, and comprises the following steps of:
s1: calculating corresponding liquid indexes according to the water contents of two parts of the water content tester layer, judging whether the liquid indexes are more than or equal to 3 and less than or equal to 4, if so, directly entering the step S2; if the liquid index is greater than 4, the process proceeds to step S11; if the liquid index is less than 3, the process proceeds to step S12;
s11: adding a flocculating agent, stirring uniformly, standing, removing upper clear water, and repeating the step S1;
s12: adding water with the mass of m, stirring, and repeating the step S1;
omega represents the current water content of the dredged soil, omega L Represents the liquid limit, omega of the soil p Representing the plastic limit of the soil;
s2: adding a liquid curing agent, a powder curing agent and a liquid reagent, and mixing to obtain dredged soil curing slurry;
wherein, the mixing amount of the liquid curing agent is 10%; the mixing amount of the powder curing agent is 2%, and the ratio of cement to lime is 1:1, a step of; the liquid reagent was incorporated at 5%.
10. A method for preparing a slurry for pneumatic mixed flow solidification of dredged earth according to claim 9, characterized in that it further comprises, before step S1:
s01: judging the generation mode of the dredged soil, if the dredged soil is the dredged soil generated by adopting a cutter suction or trailing suction mode, entering the step S02, and if the dredged soil is the dredged soil generated by adopting a grab bucket mode, directly entering the step S03;
s02: adding water with the mass fraction of 30% into the dredged soil, and uniformly stirring;
s03: and sequentially carrying out garbage separation and sand separation on the dredged soil.
The invention has the beneficial effects that: an apparatus for pneumatic mixed flow solidification of dredged earth, comprising: the device comprises a dredging soil mud storage tank, a pressure pump, a water content tester, a first stirrer, a mixing pipe, a solidified mud storage tank, a first conveying device and a second conveying device; the dredging soil mud storage pool, the pressure pump, the water content tester, the first stirrer, the mixing pipe and the solidified mud storage pool are connected through pipelines in sequence; the pressure pump is used for pumping the dredged soil out of the dredged soil storage tank; the water content tester is used for measuring the water content of the dredged soil; the first material conveying device is used for outputting water or flocculant to the first stirrer according to the measurement result of the water content tester, stirring the dredged soil and the water or flocculant through the first stirrer, and outputting the stirred dredged soil and the water or flocculant to the mixing pipe; the second material conveying device is connected with the mixing pipe and is used for outputting a liquid curing agent, a powder curing agent and a liquid reagent to the mixing pipe; the mixing pipe is used for mixing the dredged soil with the liquid curing agent, the powder curing agent and the liquid reagent and then outputting the mixture to the curing mud storage tank; the scheme can prepare slurry with proper water content and viscosity suitable for pneumatic mixed flow solidification of dredged soil, control the water content and viscosity of the mixed flow solidified slurry in a pipe, reduce the dosage of a solidifying agent, improve the solidification strength of the mixed slurry and reduce the loss and solidification cost of equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic structural diagram of an apparatus for pneumatic mixed flow solidification of dredged soil according to an embodiment of the present application;
FIG. 2 is a schematic flow chart of a slurry preparation method for pneumatic mixed flow consolidation of dredged earth according to an embodiment of the present application;
in fig. 1, the method includes:
1. a dredging soil storage tank; 2. a pressure pump; 31. a third agitator; 32. a second stirrer; 33. a first agitator;
4. a sixth stock bin; 41. a sixth flow meter; 42. a sixth feed delivery tube; 5. a vibrating screen;
6. a fifth stock bin; 61. a fifth flowmeter; 62 a fifth feed conveyor pipe; 7. a cyclone separator; 8. a sand outlet;
9. a water content tester; 10. a first bin; 101. a first flowmeter; 102. a first feed delivery tube; 11. a mixing tube;
12. a second bin; 121. a second flowmeter; 122. a second feed delivery tube; 13. a third bin; 131. a third flowmeter;
132. a third feed delivery tube; 14. a fourth stock bin; 141. a fourth flow meter; 142. a fourth feed delivery tube;
15. and (3) solidifying the mud storage tank.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present application more clear, the technical solutions of the present application will be clearly and completely described by implementation with reference to the accompanying drawings in the examples of the present application, and it is apparent that the described examples are some, but not all, examples of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Example 1
One implementation method of the device for pneumatic mixed flow solidification of dredged soil of the present application, as shown in fig. 1, includes: a dredging soil mud storage tank 1, a pressure pump 2, a water content tester 9, a first stirrer 33, a mixing pipe 11, a solidified mud storage tank 15, a first conveying device and a second conveying device. The dredging soil mud storage tank 1, the pressure pump 2, the water content tester 9, the first stirrer 33, the mixing pipe 11 and the solidified mud storage tank 15 are connected in sequence through pipelines.
The pressure pump 2 is used for pumping the dredged soil out of the dredged soil storage tank 1; the water content tester 9 is used to measure the water content of the dredged soil. The first material conveying device is used for outputting water or flocculant to the first stirrer 33 according to the measurement result of the water content tester 9, stirring the dredged soil and the water or flocculant through the first stirrer 33, and outputting the stirred water or flocculant to the mixing pipe 11. The second material conveying device is connected with the mixing pipe 11 and is used for outputting a liquid curing agent, a powder curing agent and a liquid reagent to the mixing pipe 11; the mixing pipe 11 is used for mixing dredged soil with a liquid curing agent, a powder curing agent and a liquid reagent and then outputting the mixture to the curing mud storage tank 15.
The device for pneumatic mixed flow solidification of the dredged soil can prepare slurry with proper water content and viscosity, which is suitable for pneumatic mixed flow solidification of the dredged soil, control the water content and viscosity of the mixed flow solidified slurry in a pipe, reduce the dosage of a solidifying agent, improve the solidification strength of the mixed slurry, and reduce the loss and solidification cost of equipment.
Specifically, the liquid curing agent is polyurethane, the powder curing agent is cement and lime, and the liquid agent is polyisocyanate.
The first material conveying device comprises a first storage bin 10 and a first material conveying pipe 102 connected with the first storage bin 10, wherein a first flowmeter 101 is arranged on the first material conveying pipe 102; the first silo 10 is used for storing water and/or flocculant; the flocculant is polyacrylamide or sodium carboxymethyl cellulose.
The second material conveying device comprises: a second silo 12, a third silo 13, a fourth silo 14, a second feed conveyor pipe 122, a third feed conveyor pipe 132, and a fourth feed conveyor pipe 142; the second bin 12, the third bin 13 and the fourth bin 14 are respectively connected with one ends of a second conveying pipe 122, a third conveying pipe 132 and a fourth conveying pipe 142, and the other ends of the second conveying pipe 122, the third conveying pipe 132 and the fourth conveying pipe 142 are respectively connected with the mixing pipe 11; the second bin 12, the third bin 13 and the fourth bin 14 are respectively used for storing a liquid curing agent, a powder curing agent and a liquid reagent; the second delivery pipe 122, the third delivery pipe 132, and the fourth delivery pipe 142 are provided with a second flowmeter 121, a third flowmeter 131, and a fourth flowmeter 141, respectively.
Further, the device also comprises a third material conveying device; a vibrating screen 5, a second stirrer 32 and a cyclone separator 7 are also arranged between the pressure pump 2 and the water content tester 9; the pressure pump 2, the vibrating screen 5, the second stirrer 32, the cyclone separator 7 and the water content tester 9 are connected in sequence through pipelines.
The vibrating screen 5 is used for separating garbage from dredged soil output by the pressure pump 2; and removing the garbage, stone and other large-volume components unfavorable for pumping in the dredged soil. Wherein, the vibration power of the vibrating screen 5 is 900r/min, the screen hole size is 10-30 mm, the vibration amplitude is 8mm, and the inclination of the screen surface is 4 degrees.
The third material conveying device is used for inputting the dispersing agent into the second stirrer 32 and mixing the dredged soil and the dispersing agent through the second stirrer 32; the dispersing agent is polyvinylpyrrolidone or sodium dodecyl sulfate, and the cyclone separator 7 is used for separating slurry and sand particles from dredged soil mixed by the second stirrer 32. Wherein the sieved dredged soil is added to the second agitator 32, and simultaneously dispersant with a mass fraction of 2% is added, and the mixture is introduced into the cyclone 7 after rapid agitation. The dispersing agent is added into the dredged soil slurry to promote the separation of soil and sand particles, reduce the clogging caused by the adhesion of the soil and the sand particles, improve the efficiency of the cyclone separator, realize the separation from the sand particles after passing through the cyclone separator 7, and further improve the fluidity of the slurry.
The third material conveying device comprises a fifth storage bin 6 and a fifth material conveying pipe 62 connected with the fifth storage bin 6, and a fifth flowmeter 61 is arranged on the fifth material conveying pipe 62; the fifth silo 6 is used for storing the dispersant.
Further, the device also comprises a fourth material conveying device; a third stirrer 31 is arranged between the pressure pump 2 and the vibrating screen 5; the pressure pump 2, the third agitator 31 and the vibrating screen 5 are connected in this order.
The fourth material conveying device is used for inputting a metal passivation agent and/or water accounting for 30% of the mass fraction of the dredged soil into the third stirrer 31 and mixing the dredged soil with the water and/or the heavy metal passivation agent through the third stirrer 31.
The fourth material conveying device comprises a sixth material bin 4 and a sixth material conveying pipe 42 connected with the sixth material bin 4, and a sixth flowmeter 41 is arranged on the sixth material conveying pipe; the sixth bin 4 is used for storing water and/or heavy metal passivation medicaments; the heavy metal passivation agent is biochar or lime, and the mixing amount of the agent is 5% of the mass fraction of the dredged soil.
The preparation method of the slurry for the pneumatic mixed flow solidification of the dredged soil is applied to the device for the pneumatic mixed flow solidification of the dredged soil, and comprises the following steps of:
s1: calculating corresponding liquid indexes according to the water contents of two parts of the water content tester layer, judging whether the liquid indexes are more than or equal to 3 and less than or equal to 4, if so, directly entering the step S2; if the liquid index is greater than 4, the process proceeds to step S11; if the liquid index is less than 3, the process proceeds to step S12;
s11: adding a flocculating agent, stirring uniformly, standing, removing upper clear water, and repeating the step S1;
s12: adding water with the mass of m, stirring, and repeating the step S1;
omega represents the current water content of the dredged soil, omega L Represents the liquid limit, omega of the soil p Representing the plastic limit of the soil;
s2: adding a liquid curing agent, a powder curing agent and a liquid reagent, and mixing to obtain dredged soil curing slurry; and standing the dredged soil solidified slurry to form soil blocks with certain strength.
Wherein, the mixing amount of the liquid curing agent is 10%; the mixing amount of the powder curing agent is 2%, and the ratio of cement to lime is 1:1, a step of; the liquid reagent was incorporated at 5%.
In this embodiment, before the dredged soil is processed, the type of the dredged soil needs to be determined, and the dredged soil is processed according to different types of the dredged soil, so the method further includes, before step S1:
s01: judging the generation mode of the dredged soil, if the dredged soil is the dredged soil generated by adopting a cutter suction or trailing suction mode, entering the step S02, and if the dredged soil is the dredged soil generated by adopting a grab bucket mode, directly entering the step S03;
s02: adding water with the mass fraction of 30% into the dredged soil, and uniformly stirring; namely, the dredged soil generated by adopting a cutter suction or trailing suction method needs to be stirred by the third stirrer 31, and then the step S03 is carried out;
s03: and sequentially carrying out garbage separation and sand separation on the dredged soil. That is, dredged soil produced by the grab bucket method can be directly subjected to garbage separation and sand separation through the vibrating screen 5, the second agitator 32 and the cyclone 7 without going through the step S02.
In another embodiment, if the dredged soil contains heavy metal pollutants, the third agitator 31 needs to be fed with the metal passivation agent through the fourth feeding device, so that the dredged soil and the metal passivation agent are uniformly stirred by the third agitator 31.
Note that the above is only a preferred embodiment of the present application and the technical principle applied. Those skilled in the art will appreciate that the present application is not limited to the particular embodiments described herein, but is capable of numerous obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the present application. Therefore, while the present application has been described in connection with the above embodiments, the present application is not limited to the above embodiments, but may include many other equivalent embodiments without departing from the spirit of the present application, the scope of which is defined by the scope of the appended claims.
Claims (10)
1. An apparatus for pneumatic mixed flow solidification of dredged earth, comprising: the device comprises a dredging soil mud storage tank, a pressure pump, a water content tester, a first stirrer, a mixing pipe, a solidified mud storage tank, a first conveying device and a second conveying device;
the dredging soil mud storage pool, the pressure pump, the water content tester, the first stirrer, the mixing pipe and the solidified mud storage pool are connected through pipelines in sequence;
the pressure pump is used for pumping the dredged soil out of the dredged soil storage tank;
the water content tester is used for measuring the water content of the dredged soil;
the first material conveying device is used for outputting water or flocculant to the first stirrer according to the measurement result of the water content tester, stirring the dredged soil and the water or flocculant through the first stirrer, and outputting the stirred water or flocculant to the mixing pipe;
the second material conveying device is connected with the mixing pipe and is used for outputting a liquid curing agent, a powder curing agent and a liquid reagent to the mixing pipe;
the mixing pipe is used for mixing the dredged soil with the liquid curing agent, the powder curing agent and the liquid reagent and then outputting the mixture to the curing mud storage tank.
2. An apparatus for pneumatic mixed flow solidification of dredged earth according to claim 1, characterized in that:
the liquid curing agent is polyurethane, the powder curing agent is cement and lime, and the liquid agent is polyisocyanate.
3. An apparatus for pneumatic mixed flow solidification of dredged earth according to claim 1, characterized in that:
the first material conveying device comprises a first feed bin and a first material conveying pipe connected with the first feed bin, and a first flowmeter is arranged on the first material conveying pipe;
the first bin is used for storing water and/or flocculant;
the flocculant is polyacrylamide or sodium carboxymethyl cellulose.
4. An apparatus for pneumatic mixed flow solidification of dredged earth according to claim 1, characterized in that:
the second material conveying device comprises: the second bin, the third bin, the fourth bin, the second conveying pipe, the third conveying pipe and the fourth conveying pipe;
the second bin, the third bin and the fourth bin are respectively connected with one ends of a second conveying pipe, a third conveying pipe and a fourth conveying pipe, and the other ends of the second conveying pipe, the third conveying pipe and the fourth conveying pipe are respectively connected with the mixing pipe;
the second bin, the third bin and the fourth bin are respectively used for storing a liquid curing agent, a powder curing agent and a liquid reagent; and the second conveying pipe, the third conveying pipe and the fourth conveying pipe are respectively provided with a second flowmeter, a third flowmeter and a fourth flowmeter.
5. An apparatus for pneumatic mixed flow solidification of dredged soil according to any of claims 1 to 4, characterized in that: the device also comprises a third material conveying device; a vibrating screen, a second stirrer and a cyclone separator are also arranged between the pressure pump and the water content tester; the pressure pump, the vibrating screen, the second stirrer, the cyclone separator and the water content tester are connected through pipelines in sequence;
the vibrating screen is used for carrying out garbage separation on dredged soil output by the pressure pump;
the third material conveying device is used for inputting a dispersing agent into the second stirrer and mixing the dredged soil and the dispersing agent through the second stirrer;
the cyclone separator is used for separating slurry and sand particles from the dredged soil mixed by the second stirrer.
6. An apparatus for pneumatic mixed flow solidification of dredged soil according to claim 5, wherein:
the third material conveying device comprises a fifth feed bin and a fifth material conveying pipe connected with the fifth feed bin, and a fifth flowmeter is arranged on the fifth material conveying pipe;
the fifth bin is used for storing the dispersing agent;
the dispersing agent is polyvinylpyrrolidone or sodium dodecyl sulfate;
the vibrating power of the vibrating screen is 900r/min, the size of the screen holes is 10-30 mm, the amplitude is 8mm, and the inclination of the screen surface is 4 degrees.
7. An apparatus for pneumatic mixed flow solidification of dredged soil according to claim 5, wherein: the device also comprises a fourth material conveying device; a third stirrer is arranged between the pressure pump and the vibrating screen; the pressure pump, the third stirrer and the vibrating screen are connected in sequence;
the fourth material conveying device is used for inputting a metal passivation agent and/or water accounting for 30% of the mass fraction of the dredged soil into the third stirrer, and mixing the dredged soil with the water and/or the heavy metal passivation agent through the third stirrer.
8. An apparatus for pneumatic mixed flow solidification of dredged soil according to claim 7, wherein:
the fourth conveying device comprises a sixth feed bin and a sixth conveying pipe connected with the sixth feed bin, and a sixth flowmeter is arranged on the sixth conveying pipe;
the sixth bin is used for storing the water and/or heavy metal passivation medicament;
the heavy metal passivation medicament is biochar or lime, and the dosage of the medicament is 5%.
9. A method for preparing slurry for pneumatic mixed flow solidification of dredged soil, applied to a device for pneumatic mixed flow solidification of dredged soil according to any one of claims 1 to 8, characterized by comprising the following steps:
s1: calculating corresponding liquid indexes according to the water contents of two parts of the water content tester layer, judging whether the liquid indexes are more than or equal to 3 and less than or equal to 4, if so, directly entering the step S2; if the liquid index is greater than 4, the process proceeds to step S11; if the liquid index is less than 3, the process proceeds to step S12;
s11: adding a flocculating agent, stirring uniformly, standing, removing upper clear water, and repeating the step S1;
s12: adding water with the mass of m, stirring, and repeating the step S1;
omega represents the current water content of the dredged soil, omega L Represents the liquid limit, omega of the soil p Representing the plastic limit of the soil;
s2: adding a liquid curing agent, a powder curing agent and a liquid reagent, and mixing to obtain dredged soil curing slurry;
wherein, the mixing amount of the liquid curing agent is 10%; the mixing amount of the powder curing agent is 2%, and the ratio of cement to lime is 1:1, a step of; the liquid reagent was incorporated at 5%.
10. The method for preparing slurry for pneumatic mixed flow solidification of dredged soil according to claim 9, further comprising, before step S1:
s01: judging the generation mode of the dredged soil, if the dredged soil is the dredged soil generated by adopting a cutter suction or trailing suction mode, entering the step S02, and if the dredged soil is the dredged soil generated by adopting a grab bucket mode, directly entering the step S03;
s02: adding water with the mass fraction of 30% into the dredged soil, and uniformly stirring;
s03: and sequentially carrying out garbage separation and sand separation on the dredged soil.
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| JP2020032397A (en) * | 2018-08-28 | 2020-03-05 | 五洋建設株式会社 | Method of manufacturing solidified soil |
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| JP2000054428A (en) * | 1998-08-12 | 2000-02-22 | Doboku Kenkyu Center | Mud treating method, mud dehydrating device, and device for adding additive material to mud and force-feeding mud |
| JP2002192200A (en) * | 2000-12-27 | 2002-07-10 | Penta Ocean Constr Co Ltd | Method for recycling dredged soil |
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