CN111439987A - Mud flat sludge curing agent - Google Patents

Mud flat sludge curing agent Download PDF

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Publication number
CN111439987A
CN111439987A CN202010419762.0A CN202010419762A CN111439987A CN 111439987 A CN111439987 A CN 111439987A CN 202010419762 A CN202010419762 A CN 202010419762A CN 111439987 A CN111439987 A CN 111439987A
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CN
China
Prior art keywords
curing agent
sludge
sludge curing
excitant
reinforcing
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
Application number
CN202010419762.0A
Other languages
Chinese (zh)
Inventor
赵天彪
张沈裔
赵东华
康明
崔勇涛
钱晓明
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai Waterway Engineering Design and Consulting Co Ltd
Shanghai Baotian New Building Materials Co Ltd
Original Assignee
Shanghai Waterway Engineering Design and Consulting Co Ltd
Shanghai Baotian New Building Materials Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shanghai Waterway Engineering Design and Consulting Co Ltd, Shanghai Baotian New Building Materials Co Ltd filed Critical Shanghai Waterway Engineering Design and Consulting Co Ltd
Priority to CN202010419762.0A priority Critical patent/CN111439987A/en
Publication of CN111439987A publication Critical patent/CN111439987A/en
Pending legal-status Critical Current

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Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/24Compositions 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 alkyl, ammonium or metal silicates; containing silica sols
    • C04B28/26Silicates of the alkali metals
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/008Sludge treatment by fixation or solidification
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00Use 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
    • C04B18/04Waste materials; Refuse
    • C04B18/06Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/062Purification products of smoke, fume or exhaust-gases
    • C04B18/064Gypsum
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00Use 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
    • C04B18/04Waste materials; Refuse
    • C04B18/14Waste materials; Refuse from metallurgical processes
    • C04B18/141Slags
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/007Contaminated open waterways, rivers, lakes or ponds
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20Mortars, concrete or artificial stone characterised by specific physical values for the density
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Inorganic Chemistry (AREA)
  • Water Supply & Treatment (AREA)
  • Combustion & Propulsion (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treatment Of Sludge (AREA)
  • Soil Conditioners And Soil-Stabilizing Materials (AREA)

Abstract

A mudflat sludge curing agent comprises the following components in percentage by mass: 30-50% of ordinary portland cement, 25-40% of mineral powder, 20-35% of desulfurized ash and 2-15% of reinforcing excitant. Compared with the prior art, the invention takes the industrial waste as the main raw material, thereby not only realizing the resource utilization of the industrial solid waste, but also greatly reducing the harm of the solid waste to the environment, simultaneously having high curing strength, high construction speed and reduced construction cost, and the cured sludge has no problems of dispersion, collapse and the like.

Description

Mud flat sludge curing agent
Technical Field
The invention relates to the technical field of mud flat mud curing, in particular to a mud flat curing agent.
Background
The tidal flat area in the coastal mid-latitude area of China is huge, wherein the muddy coast accounts for more than 20 percent, and is mainly distributed in the areas of the delta impact plains of rivers entering the mouth of the sea, such as the Yangtze river, the yellow river, the Zhujiang river, the Qiantangjiang river and the like, and the harbor areas of the coastal local areas, such as the Zhejiang, the Min, the Guangdong and the like. Due to the environment of mud flat sludge and special forming conditions, soil layers are unevenly distributed, mineral compositions are complex, the salt content is high, the compression modulus Es is less than 3.0MPa, the water content is as high as 80%, and the void ratio is more than 2.5. Due to the special physical properties, the strength is low, the sensitivity is high, the bearing capacity is low, uneven settlement is large, the engineering property is poor, and sliding, collapse, inclination and the like of a building are easily caused, so that before the construction of an upper engineering structure, the upper engineering structure needs to be reinforced to meet the requirements of bearing capacity and settlement control so as to achieve the basic performance required by engineering construction.
At present, the sludge in-situ curing technology plays an increasingly important role in the coastal mud flat sludge curing and ecological treatment processes of rivers and lakes, but the sludge curing agent selected by the technology mainly comprises traditional curing agents such as cement, fly ash and the like, but cement not only needs to continuously claim valuable limestone and clay resources from nature in the production process, but also has large production energy consumption and causes serious influence on the ecological environment, and most of novel environment-friendly sludge curing agents need to be introduced abroad, so that the product price is high.
Meanwhile, with the development of industrialization, various industrial wastes bring serious harm to the environment on which human beings live, industrial slag and other wastes are developed and utilized to form a sludge curing agent, which becomes an important way for recycling solid wastes.
To solve the above problems, a series of improvements have been made.
Disclosure of Invention
The invention aims to provide a beach sludge curing agent to overcome the defects of the prior art.
A mudflat sludge curing agent comprises the following components in percentage by mass: 30-50% of ordinary portland cement, 25-40% of mineral powder, 20-35% of desulfurized ash and 2-15% of reinforcing excitant.
Further, the chemical components of the mineral powder comprise: SiO 22、Al2O3、CaO、MgO、Fe2O3、TiO2And MnO2
Furthermore, the water content of the desulfurized fly ash is 1-4%, and the desulfurized fly ash comprises 30-45% of semi-hydrated gypsum and 55-70% of dihydrate gypsum.
Further, the reinforcing excitant comprises the following components in percentage by mass: 16-23% of calcium oxide, 46-66% of sodium silicate, 16-27% of calcium chloride and 1-7% of polyacrylamide.
Further, the powder specific surface area of the beach sludge curing agent is 460-600m2Per kg, the powder density of the mudflat sludge curing agent is 2.6-2.9g/cm3And the standard consistency of the powder of the mudflat sludge curing agent is 24-26%.
The invention has the advantages of
Aiming at the problems that the prior solidified sludge is easy to disperse, collapse and the like, and even the solidified sludge is reversed and the like, the invention takes industrial waste as a main raw material, generates a superposition effect by compounding with other components, and can be cemented with the silt particles with high water content at normal temperature, thereby obviously improving the physical and mechanical properties of the coastal silt with high water content, rapidly improving the strength and the integrity of the foundation, and having high solidification strength, high construction speed, short construction period and low construction cost. In addition, a large amount of industrial solid wastes such as gypsum, slag and the like are adopted in the curing agent as novel curing materials for replacing cement, so that the cement consumption can be greatly reduced, the energy consumption is reduced, the resource utilization of the industrial solid wastes is realized, and the harm of the solid waste to the environment is reduced.
In conclusion, the curing agent has remarkable economic benefit, social benefit and environmental benefit and wide application prospect.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be purely exemplary of the invention and are not intended to limit the scope of the invention.
Example 1
30-50% of ordinary portland cement, 25-40% of mineral powder, 20-35% of desulfurized ash and 2-15% of reinforcing excitant.
The chemical components of the mineral powder comprise: SiO 22、Al2O3、CaO、MgO、Fe2O3、TiO2And MnO2. The water content of the desulfurized ash is 1-4%, and the desulfurized ash comprises 30-45% of semi-hydrated gypsum and 55-70% of dihydrate gypsum.
The reinforcing excitant comprises the following components in percentage by mass: 16-23% of calcium oxide, 46-66% of sodium silicate, 16-27% of calcium chloride and 1-7% of polyacrylamide.
Powder specific surface area of mud flat silt curing agent is 460-600m2The powder density of the mud flat sludge curing agent is 2.6-2.9g/cm3The standard consistency of the powder of the mud flat silt curing agent is 24-26%.
The traditional curing agent adopts cement, lime or a mixture of the cement and the lime, and the action mechanism of the invention is different from that of the traditional curing agents such as cement and the like to the greatest extent: because the invention is mainly compounded by industrial waste, although the invention contains a large amount of potential active materials, the hydration speed of the invention is very slow, and the enhancing excitant in the invention can quickly consume the water in the sludge and emit heat to increase the temperature of the sludge, thereby improving the hydration speed of the potential active materials and simultaneously promoting the improvement of the early strength of the solidified sludge, which is mainly shown in that:
after the sludge is doped with the curing agent, polyacrylamide in the activator is firstly enhanced to immediately hydrolyze and consume a large amount of water in the sludge, the water content of the sludge is reduced, and meanwhile, suspended particles in the sludge are polymerized together through the flocculation effect of the polyacrylamide to form a net structure, so that a good foundation is laid for the subsequent curing and strength improvement of the sludge particles.
The method can enhance the hydrolysis of calcium oxide in the activator into high-valence metal ions and hydroxide (OH)-) Ions are generated to form an alkaline environment, so that the stability of the silicic acid gel of the cement hydration product is ensured, and meanwhile, the stability of the silicic acid gel of the cement hydration product is ensuredThe reaction with mineral powder and alkali active materials such as silicon oxide, aluminum oxide and the like in the desulfurized ash to generate hydration products such as hydraulic cementing products, and the hydration products not only can effectively reduce the water content of the sludge and fill the pores of the soil body, but also have strong physical cementing capacity, can well wrap, connect and continuously cement and harden soil particles, and cement the flowing high-water-content sludge soil into sludge soil with certain strength.
A large number of pores are generated in the process of water consumption and particle cementation in the sludge, and the sodium silicate in the reinforcing excitant reacts with high-valence metal ions in the pore water of the sludge to generate calcium silicate or silica gel particles, so that the pores among the sludge particles are further filled, the compact type of the sludge structure is enhanced, and the strength of the sludge structure is further improved.
The calcium chloride in the reinforcing excitant can accelerate the hydration rate of tricalcium aluminate and excite the activity of mineral powder, has the functions of accelerating setting and early strength, improves the early strength of solidified sludge, and prevents the problems of dispersion and collapse of early solidified soil and the like.
In the embodiment, 35% of PO42.5 ordinary portland cement, 30% of mineral powder, 26% of desulfurized ash and 9% of reinforcing excitant are uniformly mixed, wherein the reinforcing excitant is prepared from 18.92% of calcium oxide, 53.15% of sodium silicate, 26.13% of calcium chloride and 1.8% of polyacrylamide, and strict moisture-proof measures are adopted in the processes of material mixing, stockpiling and transportation.
The product of example 1 is used for curing the sludge at the south side of the Yangtze river mouth of the Shanghai river, the water content of the sludge is 100 percent, the mixing amount of the curing agent is 8 percent of the dry weight of the sludge, the curing agent and the sludge are fully stirred and mixed and then are naturally cured, the unconfined compressive strength of the cured sludge is 0.21MPa after 7 days, the unconfined compressive strength of the cured sludge reaches 0.62MPa after 28 days, and the cured sludge has no problems of dispersion, collapse and the like.
Example 2
A mud flat sludge curing agent is prepared by uniformly mixing 42% of ordinary portland cement, 25% of mineral powder, 30% of desulfurized ash and 3% of reinforcing excitant by weight percentage. The reinforcing excitant is prepared from 20% of calcium oxide, 53% of sodium silicate, 20% of calcium chloride and 7% of polyacrylamide, and strict moisture-proof measures are adopted in the processes of material mixing, stockpiling and transportation.
The product of example 2 is used for curing the silt of the shanghai mintong san lu highway major river west gate, the moisture content of the silt is 80%, the mixing amount of the curing agent is 12% of the dry weight of the silt, the curing agent and the silt are fully stirred and mixed for natural curing, the 7-day unconfined compressive strength of the cured silt is 0.83MPa, the 28-day unconfined compressive strength of the cured silt reaches 1.21MPa, and the cured silt has no problems of dispersion, collapse and the like.
Example 3
A mud flat sludge curing agent is prepared by uniformly mixing 42.34 percent of ordinary Portland cement, 28.83 percent of mineral powder, 24.33 percent of desulfurized ash and 4.5 percent of reinforcing excitant according to weight percentage. The reinforcing excitant is prepared with calcium oxide 20.39 wt%, sodium silicate 60.19 wt%, calcium chloride 17.48 wt% and polyacrylamide 1.94 wt%, and strict moisture-proof measures are adopted during mixing, storing and transportation.
The product of example 3 is used for curing the mud on the coastal mudflat of the Xiamen tinluan gulf, the water content of the mud is 100 percent, the mixing amount of the curing agent is 16 percent of the dry weight of the mud, the curing agent and the mud are fully stirred and mixed and then are naturally cured, the 7-day average unconfined compressive strength of the cured mud is 1.21MPa, the 28-day unconfined compressive strength of the cured mud reaches 1.73MPa, and the cured mud has no problems of dispersion, collapse and the like.
While the present invention has been described with reference to the specific embodiments, the present invention is not limited thereto, and various changes may be made without departing from the spirit of the present invention.

Claims (5)

1. The mud flat sludge curing agent is characterized by comprising the following components in percentage by mass: 30-50% of ordinary portland cement, 25-40% of mineral powder, 20-35% of desulfurized ash and 2-15% of reinforcing excitant.
2. The beach sludge curing agent of claim 1, wherein: the chemical components of the mineral powder comprise: SiO 22、Al2O3、CaO、MgO、Fe2O3、TiO2And MnO2
3. The beach sludge curing agent of claim 1, wherein: the water content of the desulfurized fly ash is 1-4%, and the desulfurized fly ash comprises 30-45% of semi-hydrated gypsum and 55-70% of dihydrate gypsum.
4. The beach sludge curing agent of claim 1, wherein: the reinforcing excitant comprises the following components in percentage by mass: 16-23% of calcium oxide, 46-66% of sodium silicate, 16-27% of calcium chloride and 1-7% of polyacrylamide.
5. The beach sludge curing agent of claim 1, wherein: the powder specific surface area of the mudflat sludge curing agent is 460-600m2Per kg, the powder density of the mudflat sludge curing agent is 2.6-2.9g/cm3And the standard consistency of the powder of the mudflat sludge curing agent is 24-26%.
CN202010419762.0A 2020-05-18 2020-05-18 Mud flat sludge curing agent Pending CN111439987A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113845341A (en) * 2021-07-21 2021-12-28 东南大学 Composite curing agent for bottom mud of river pond and curing method
CN115140910A (en) * 2022-06-22 2022-10-04 中建安装集团有限公司 Desulfurization ash curing material for high-water-content silt soil
CN115179423A (en) * 2022-07-28 2022-10-14 深圳宏业基岩土科技股份有限公司 Construction site sludge reinforcing method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011093750A (en) * 2009-10-30 2011-05-12 Nippon Steel Corp Mud-containing solidified matter and method for manufacturing the same
CN103130476A (en) * 2013-03-18 2013-06-05 江苏坤泽科技股份有限公司 Ocean dredging sludge composite solidified material
CN103553520A (en) * 2013-11-04 2014-02-05 江苏坤泽科技股份有限公司 Stabilized soil applicable to intertidal zone sludge stable layer
CN103880379A (en) * 2014-02-15 2014-06-25 江苏坤泽科技股份有限公司 Environment-friendly nickel alloy slag composite curing material for flat sludge
CN109456010A (en) * 2018-12-27 2019-03-12 青岛理工大学 Utilize the shield-tunneling construction discarded slurry curing agent and application method of oil refining solid waste preparation

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2011093750A (en) * 2009-10-30 2011-05-12 Nippon Steel Corp Mud-containing solidified matter and method for manufacturing the same
CN103130476A (en) * 2013-03-18 2013-06-05 江苏坤泽科技股份有限公司 Ocean dredging sludge composite solidified material
CN103553520A (en) * 2013-11-04 2014-02-05 江苏坤泽科技股份有限公司 Stabilized soil applicable to intertidal zone sludge stable layer
CN103880379A (en) * 2014-02-15 2014-06-25 江苏坤泽科技股份有限公司 Environment-friendly nickel alloy slag composite curing material for flat sludge
CN109456010A (en) * 2018-12-27 2019-03-12 青岛理工大学 Utilize the shield-tunneling construction discarded slurry curing agent and application method of oil refining solid waste preparation

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乌效鸣等: "《钻井液与岩土工程浆液》", 30 June 2002, 中国地质大学出版社 *
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113845341A (en) * 2021-07-21 2021-12-28 东南大学 Composite curing agent for bottom mud of river pond and curing method
CN115140910A (en) * 2022-06-22 2022-10-04 中建安装集团有限公司 Desulfurization ash curing material for high-water-content silt soil
CN115179423A (en) * 2022-07-28 2022-10-14 深圳宏业基岩土科技股份有限公司 Construction site sludge reinforcing method

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