CN115028382A - Process for preparing fluidized treatment soil based on recovered sludge - Google Patents
Process for preparing fluidized treatment soil based on recovered sludge Download PDFInfo
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- CN115028382A CN115028382A CN202210953400.9A CN202210953400A CN115028382A CN 115028382 A CN115028382 A CN 115028382A CN 202210953400 A CN202210953400 A CN 202210953400A CN 115028382 A CN115028382 A CN 115028382A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/021—Agglomerated materials, e.g. artificial aggregates agglomerated by a mineral binder, e.g. cement
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/0418—Wet materials, e.g. slurries
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the field of sludge treatment, and particularly relates to a process for preparing fluidized treatment soil based on recovered sludge, which comprises the following steps: step one, detecting sludge, and recycling the sludge meeting the standard to a sludge tank for stacking; step two, conveying the recovered sludge into a screening device, and screening to remove granules with the particle size larger than 40 mm; step three, feeding the screened sludge into a granulating device, and adding a curing agent to carry out curing treatment on the sludge to obtain cured material particles; step four, sending the obtained solidified material particles into an improvement device, adding cement and fly ash, and uniformly stirring to obtain improved particles; and fifthly, feeding the improved grains into a pulping device, adding clear water and bentonite, mixing and stirring uniformly to obtain fluidized treatment soil, and limiting the process steps to treat the recovered sludge to obtain the fluidized treatment soil which can be applied to building construction occasions such as pipe gallery backfilling, construction slit filling, pipeline filling and the like.
Description
Technical Field
The invention belongs to the field of sludge treatment, and particularly relates to a process for preparing fluidized treatment soil based on recovered sludge.
Background
Along with the rapid increase of economy, the problems of high resource consumption, large waste, serious environmental pollution and the like are increasingly highlighted, the contradiction of insufficient resources such as land, energy, mineral products and the like is more prominent, the environmental pressure is increasingly increased, and the promotion of the cyclic utilization of resources becomes urgent; the engineering mud is a component of building residue soil, mainly comes from various building pile foundations, foundation pit maintenance structures, mud shields, pipe network underground excavation and the like, and comprises piling mud, subway shield mud, river dredging mud and the like. The conventional treatment mode is that the slurry is transported to a spoil disposal site for storage or is buried in open sea, so that the engineering slurry cannot be effectively utilized, and a series of environmental and economic problems are caused as the accumulation amount of the slurry is larger and larger; there is a need for further improvement.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a process for preparing fluidized treatment soil based on recovered sludge.
The invention adopts the following technical scheme:
a process for preparing fluidized treatment soil based on recovered sludge comprises the following steps:
detecting sludge, and when mercury in the sludge is less than or equal to 1.5mg/kg, arsenic in the sludge is less than or equal to 40mg/kg, copper in the sludge is less than or equal to 400mg/kg, lead in the sludge is less than or equal to 500mg/kg, chromium in the sludge is less than or equal to 300mg/kg, and hexavalent chromium, turf, household garbage, tree roots and humus are not included, recovering the sludge to a sludge pond for stacking;
step two, conveying the recovered sludge into a screening device, and screening to remove granules with the particle size larger than 40 mm;
feeding the screened sludge into a granulating device, and adding a curing agent to carry out curing treatment on the sludge to obtain cured material particles;
step four, sending the obtained solidified material particles into an improvement device, adding cement and fly ash, crushing the solidified material particles and uniformly stirring the crushed solidified material particles, the cement and the fly ash to obtain improved particles with the particle size of less than 20 mm;
and fifthly, feeding the improved granules into a pulping device, adding clear water and bentonite accounting for 8-12% of the weight of the improved granules, and uniformly mixing and stirring to obtain fluidized treatment soil with the water content of 80-90%.
Further, in the third step, the curing agent comprises cement and lime, the adding amount of the cement is 4-8% of the weight of the sludge, and the adding amount of the lime is 5-20% of the weight of the sludge.
Furthermore, in the fourth step, the adding amount of the cement is 2-8% of the weight of the sludge, and the adding amount of the fly ash is 5-20% of the weight of the sludge.
Further, slurrying device includes and is connected the slurrying pond that supplies improvement grain to get into with the improvement device, the pond of being connected with the slurrying pond, the mixer of being connected with the slurrying pond discharge gate, the bentonite storage tank of supply bentonite is connected with the mixer, connect the first inlet tube between slurrying pond and pond, the second inlet tube of connection between mixer and pond, set up the first moisture content sensor in the slurrying pond and set up the second moisture content sensor in the mixer, when first moisture content sensor detects that the moisture content of raw materials thick liquid is 80-90% in the slurrying pond, send into the mixer again with raw materials thick liquid and mix the stirring with the bentonite.
Furthermore, including two stirring rakes that the interval set up in the slurrying pond, the stirring rake includes the (mixing) shaft that extends along vertical direction and sets up a plurality of stirring leaves on the (mixing) shaft along vertical direction interval.
Furthermore, all be provided with the valve on first inlet tube and the second inlet tube.
Furthermore, the granulation device comprises a vibration arch breaker connected with the screening device, a metering device arranged at the discharge port of the vibration arch breaker, a belt conveyor arranged below the metering device, a granulator connected with the belt conveyor and used for feeding the crushed sludge, and a curing agent storage tank connected with the granulator and used for supplying a curing agent.
Further, be connected through the air feed system between curing agent storage tank and the granulator, the air feed system includes the screw conveyer of being connected with curing agent storage grain jar discharge gate, the impeller feed ware of being connected with screw conveyer and the air feed groove of connection between impeller feed ware and granulator.
Further, the improved device comprises an improved tank body, and a stirring blade for crushing and stirring the solidified sludge is rotatably arranged in the improved tank body.
Furthermore, in the third step, the particle size of the solidified material particles is less than 20 mm.
As can be seen from the above description of the present invention, compared with the prior art, the beneficial effects of the present invention are:
the method limits the recovery standard of the recovered sludge, is matched with the limited process steps, and processes the recovered sludge through the steps of solidification, improvement, pulping and the like so as to obtain the fluidized treatment soil which can be applied to building construction occasions such as pipe gallery backfilling, construction slit filling, pipeline filling and the like, solve the problem of treatment of engineering sludge and slurry, improve the resource utilization rate, reduce pollution, improve the environment, promote sustainable development, improve economic benefit and reduce carbon emission; the added cement and lime curing agent, the cement and fly ash modifier are conventional agents, but the curing agent and the modifier are matched with the curing and modifying steps so as to granulate the sludge granules, adjust the water content and increase the strength of the fluidized treatment soil; firstly, adding cement, lime and sludge for solidification treatment so as to quickly adjust the water content and increase the strength; and then, the cement and the fly ash are used for improving the sludge so as to further improve the strength and control the water content in an accurate range so as to obtain a raw material of the fluidized treatment soil, and the raw material is matched with bentonite and water to be uniformly stirred so as to obtain the fluidized treatment soil with the required requirement.
Drawings
FIG. 1 is a schematic structural view of the present invention;
in the figure, 1-a sludge tank, 2-a screening device, 3-a granulating device, 4-a modifying device, 5-a pulping device, 6-a storage tank, 31-a vibration arch breaking device, 32-a metering device, 33-a belt conveyor, 34-a granulating machine, 35-a curing agent storage tank, 36-an air conveying system, 361-a screw conveyor, 362-an impeller feeder, 363-an air conveying tank, 51-a pulping tank, 511-a stirring paddle, 512-a stirring shaft, 513-a stirring blade, 52-a water tank, 53-a stirring machine, 531-a conveying pipe, 532-a slurry pump, 54-a bentonite storage tank, 55-a first water inlet pipe, 56-a second water inlet pipe, 57-a first water content sensor, 58-a second water content sensor, 59-valve.
Detailed Description
The invention is further described below by means of specific embodiments.
A technology for preparing fluidized treatment soil based on recovered sludge adopts fluidized treatment soil preparation equipment for treatment.
A fluidized treatment soil preparation device comprises a sludge tank 1, a screening device 2, a granulation device 3, an improvement device 4, a pulping device 5 and a storage tank 6.
A sludge tank 1 for stacking recovered sludge for subsequent treatment, wherein the recovered sludge should meet the following criteria: mercury is less than or equal to 1.5mg/kg, arsenic is less than or equal to 40mg/kg, copper is less than or equal to 400mg/kg, lead is less than or equal to 500mg/kg, chromium is less than or equal to 300mg/kg, and hexavalent chromium, turf, household garbage, tree roots and humus are not included.
The screening device 2 is connected with the sludge tank 1 and is used for screening the recovered sludge to remove material particles with the particle size larger than 40 mm; specifically, the screening device 2 is a device commonly used in the field of material screening, and the specific structure and the working principle thereof are not further described here.
The granulating device 3 is connected with the screening device 2, and is used for granulating the sludge granules with the particle size of less than 40mm obtained by screening to obtain solidified granules with the particle size of less than 20mm, and comprises a vibration arch breaker 31 connected with the screening device 2, a metering device 32 arranged at the discharge port of the vibration arch breaker 31, a belt conveyor 33 arranged below the metering device 32, a granulator 34 connected with the belt conveyor 33 and used for feeding crushed sludge and a curing agent storage tank 35 connected with the granulator 34 and used for supplying curing agent, wherein during granulation, the screened sludge granules are firstly subjected to vibration crushing treatment by the vibration arch breaker 31 and then are fed into the granulator 34 to be uniformly mixed and stirred with the curing agent to obtain the solidified granules; specifically, the curing agent storage tank 35 is connected with the pelletizer 34 through the pneumatic conveying system 36, and the pneumatic conveying system 36 comprises a screw conveyor 361 connected with the discharge port of the curing agent storage tank 35, an impeller feeder 362 connected with the screw conveyor 361, and a pneumatic conveying tank 363 connected between the impeller feeder 362 and the pelletizer 34; further, the curing agent storage tank 35 comprises a first curing agent storage tank for storing cement and a second curing agent storage tank for storing lime, and the first curing agent storage tank and the second curing agent storage tank are connected with the granulator 34 through an air supply system 36.
The improvement device 4 is connected with the granulator 34, improves the solidified material granules after solidification to obtain improved granules with the grain diameter of less than 20mm, and is internally and rotatably provided with a stirring blade for crushing and stirring the solidified material granules; during improvement, the stirring blade rotates to crush and stir the solidified material particles, and the solidified material particles are mixed and stirred uniformly with the added cement and fly ash to obtain improved particles.
The pulping device 5 is connected with the improvement device 4, and is used for processing the improved grains obtained by the improvement device to obtain the fluidized processing soil with the water content of 80-90 percent, and comprises a pulping pool 51 into which the improved grains enter, a water pool 52 connected with the pulping pool 51, a stirrer 53 connected with a discharge port of the pulping pool 51, a bentonite storage tank 54 connected with the stirrer 53 and used for supplying bentonite, a first water inlet pipe 55 connected between the pulping pool 51 and the water pool 52, a second water inlet pipe 56 connected between the stirrer 53 and the water pool 52, a first water content sensor 57 arranged in the pulping pool 51 and a second water content sensor 58 arranged in the stirrer 53, wherein during pulping, firstly, stirring the improved grains and water into raw material slurry with the water content of 80-90%, and then sending the raw material slurry into a stirrer 53 to be stirred with bentonite and water to obtain fluidized treatment soil with the water content of 80-90%; specifically, the pulping tank 51 is connected with the stirrer 53 through a feeding pipe 531, the feeding pipe 531 is provided with a slurry pump 532, and when the first water content sensor 57 detects that the water content of the raw material slurry in the pulping tank 51 is 80-90%, the raw material slurry is fed into the stirrer 53 through the slurry pump 532 to be mixed and stirred with the bentonite; further, the pulping tank 51 comprises two stirring paddles 511 arranged at intervals, the stirring paddles 511 comprise a stirring shaft 512 extending along the vertical direction and a plurality of stirring blades 513 arranged on the stirring shaft 512 at intervals along the vertical direction, and the two stirring paddles 511 arranged at intervals ensure that the improved grains and water are uniformly mixed and stirred so as to obtain raw material pulp with stable quality; the first water inlet pipe 55 and the second water inlet pipe 56 are provided with valves 59, and water in the water tank 52 is sent to the pulping tank 51 or the mixer 53 by controlling the opening and closing of the valves 59.
And the storage tank 6 is connected with the stirrer 53, temporarily stores the obtained fluidized treatment soil, and transports the soil to a required place through a tank truck according to use requirements.
The process for preparing the fluidized treatment soil based on the recovered sludge comprises the following steps:
detecting sludge, and when mercury in the sludge is less than or equal to 1.5mg/kg, arsenic in the sludge is less than or equal to 40mg/kg, copper (farmland) is less than or equal to 400mg/kg, copper in the sludge is less than or equal to 400mg/kg, lead in the sludge is less than or equal to 500mg/kg, chromium (dry land) is less than or equal to 300mg/kg, and hexavalent chromium, turf, household garbage, tree roots and humus are not included, recycling the sludge to a sludge pool 1 for stacking;
step two, conveying the recovered sludge into a screening device 2, and carrying out screening treatment to remove granules with the particle size of more than 40 mm;
step three, conveying the screened sludge into a granulating device 3, adding cement and lime to solidify the sludge to obtain solidified material particles with the particle size of less than 20mm, wherein the adding amount of the cement is 4-8% of the weight of the sludge, and the adding amount of the lime is 5-20% of the weight of the sludge;
step four, sending the obtained solidified material particles into an improvement device 4, adding cement and fly ash, crushing the solidified material particles and uniformly stirring the crushed solidified material particles with the cement and the fly ash to obtain improved particles with the particle size of less than 20mm, wherein the adding amount of the cement is 2-8% of the weight of the sludge, and the adding amount of the fly ash is 5-20% of the weight of the sludge;
and step five, feeding the improved granules into a pulping device 5, adding clear water and bentonite accounting for 8-12% of the weight of the improved granules, and uniformly mixing and stirring to obtain fluidized treatment soil with the water content of 80-90%.
The method limits the recovery standard of the recovered sludge, is matched with the limited process steps, and processes the recovered sludge through the steps of solidification, improvement, pulping and the like so as to obtain the fluidized treatment soil which can be applied to building construction occasions such as pipe gallery backfilling, construction slit filling, pipeline filling and the like, solve the problem of treatment of engineering sludge and slurry, improve the resource utilization rate, reduce pollution, improve the environment, promote sustainable development, improve economic benefit and reduce carbon emission; the added cement and lime curing agent, the cement and fly ash modifier are conventional agents, but the curing agent and the modifier are matched with the curing and modifying steps so as to granulate the sludge granules, adjust the water content and increase the strength of the fluidized treatment soil; firstly, adding cement, lime and sludge for solidification treatment so as to quickly adjust the water content and increase the strength; and then, the cement and the fly ash are used for improving the sludge so as to further improve the strength and control the water content in an accurate range so as to obtain a raw material of the fluidized treatment soil, and the raw material is matched with bentonite and water to be uniformly stirred so as to obtain the fluidized treatment soil with the required requirement.
The above description is only a preferred embodiment of the present invention, and therefore should not be taken as limiting the scope of the invention, and the equivalent variations and modifications made in the claims and the description of the present invention should be included in the scope of the present invention.
Claims (10)
1. A process for preparing fluidized treatment soil based on recycled sludge is characterized by comprising the following steps: the method comprises the following steps:
detecting sludge, and when mercury in the sludge is less than or equal to 1.5mg/kg, arsenic in the sludge is less than or equal to 40mg/kg, copper in the sludge is less than or equal to 400mg/kg, lead in the sludge is less than or equal to 500mg/kg, chromium in the sludge is less than or equal to 300mg/kg, and hexavalent chromium, turf, household garbage, tree roots and humus are not included, recovering the sludge to a sludge pond for stacking;
step two, conveying the recovered sludge into a screening device, and screening to remove granules with the particle size larger than 40 mm;
feeding the screened sludge into a granulating device, and adding a curing agent to carry out curing treatment on the sludge to obtain cured material particles;
step four, sending the obtained solidified material particles into an improvement device, adding cement and fly ash, crushing the solidified material particles and uniformly stirring the crushed solidified material particles, the cement and the fly ash to obtain improved particles with the particle size of less than 20 mm;
and fifthly, feeding the improved granules into a pulping device, adding clear water and bentonite accounting for 8-12% of the weight of the improved granules, and uniformly mixing and stirring to obtain fluidized treatment soil with the water content of 80-90%.
2. The process for preparing fluidized treatment soil based on recycled sludge according to claim 1, wherein the process comprises the following steps: in the third step, the curing agent comprises cement and lime, the addition of the cement is 4-8% of the weight of the sludge, and the addition of the lime is 5-20% of the weight of the sludge.
3. The process for preparing fluidized treatment soil based on the recovered sludge according to claim 1, wherein the process comprises the following steps: in the fourth step, the adding amount of the cement is 2-8% of the weight of the sludge, and the adding amount of the fly ash is 5-20% of the weight of the sludge.
4. The process for preparing fluidized treatment soil based on recycled sludge according to claim 1, wherein the process comprises the following steps: the pulping device comprises a pulping pool, a water pool, a stirrer, a bentonite storage tank, a first water inlet pipe, a second water inlet pipe, a first water content sensor and a second water content sensor, wherein the pulping pool is connected with the improvement device and used for improved grains to enter, the water pool is connected with the pulping pool, the stirrer is connected with a discharge port of the pulping pool, the bentonite storage tank is connected with the stirrer and used for supplying bentonite, the first water inlet pipe is connected between the pulping pool and the water pool, the second water inlet pipe is connected between the stirrer and the water pool, the first water content sensor is arranged in the pulping pool, and the second water content sensor is arranged in the stirrer.
5. The process for preparing fluidized treatment soil based on the recovered sludge according to claim 4, wherein the process comprises the following steps: the pulping tank comprises two stirring paddles arranged at intervals, and each stirring paddle comprises a stirring shaft extending along the vertical direction and a plurality of stirring blades arranged on the stirring shaft at intervals along the vertical direction.
6. The process for preparing fluidized treatment soil based on recycled sludge according to claim 4, wherein the process comprises the following steps: all be provided with the valve on first inlet tube and the second inlet tube.
7. The process for preparing fluidized treatment soil based on recycled sludge according to claim 1, wherein the process comprises the following steps: the granulating device comprises a vibration arch breaking device connected with the screening device, a metering device arranged at a discharge port of the vibration arch breaking device, a belt conveyor arranged below the metering device, a granulating machine connected with the belt conveyor and used for feeding crushed sludge, and a curing agent storage tank connected with the granulating machine and used for supplying curing agent.
8. The process for preparing fluidized treatment soil based on the recovered sludge according to claim 7, wherein the process comprises the following steps: the curing agent storage tank is connected with the granulator through an air conveying system, and the air conveying system comprises a screw conveyor connected with a discharge port of the curing agent storage tank, an impeller feeder connected with the screw conveyor and an air conveying groove connected between the impeller feeder and the granulator.
9. The process for preparing fluidized treatment soil based on recycled sludge according to claim 1, wherein the process comprises the following steps: the improved device comprises an improved tank body, wherein a stirring blade for crushing and stirring the solidified sludge is rotatably arranged in the improved tank body.
10. The process for preparing fluidized treatment soil based on the recovered sludge according to claim 1, wherein the process comprises the following steps: in the third step, the grain diameter of the solidified material grain is less than 20 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116922583A (en) * | 2023-09-18 | 2023-10-24 | 北京鼎创环保有限公司 | Production system of novel roadbed material containing sludge |
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| JPH1034191A (en) * | 1996-07-26 | 1998-02-10 | Osaka Bentonaito Jigiyou Kyodo Kumiai | Cycling of building sludge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116922583A (en) * | 2023-09-18 | 2023-10-24 | 北京鼎创环保有限公司 | Production system of novel roadbed material containing sludge |
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| CN115028382B (en) | 2022-12-16 |
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