CN104876515B - A kind of aluminium base gelling curing agent, preparation method and applications - Google Patents
A kind of aluminium base gelling curing agent, preparation method and applications Download PDFInfo
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- CN104876515B CN104876515B CN201510161480.4A CN201510161480A CN104876515B CN 104876515 B CN104876515 B CN 104876515B CN 201510161480 A CN201510161480 A CN 201510161480A CN 104876515 B CN104876515 B CN 104876515B
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Abstract
The invention discloses a kind of aluminium base gelling curing agent, calcium aluminate：Sulphur aluminium cement：The mass ratio of early strong flocculation aid is (1~3):(6.5~8.5):0.5.The invention also discloses a kind of preparation method of above-mentioned aluminium base gelling curing agent：It is (1~3) by mass ratio:(6.5~8.5):Then 0.5 calcium aluminate, sulphur aluminium cement and early strong flocculation aid grinding, sieving, mixed-stacking flattens into coniform, surrounding sample is formed after circular cone again to center accumulation and flattened, aluminium base gelling curing agent is so obtained several times repeatedly.The invention also discloses a kind of method that Dredged bed mud is disposed using above-mentioned aluminium base gelling curing agent：By the rubbish sandstone separation in the mud of Dredged bed mud, then adding cationic-type polyacrylamide makes Dredged bed mud thickening, adds aluminium base gelling curing agent and mixes, and is uniformly mixed while adding water reducer, stabilisation maintenance is carried out after dehydrating and curing.The present invention has higher economy, society and environmental benefit.
Description
Technical field
The invention belongs to environmental technology field, it is related to a kind of aluminium base gelling curing agent, preparation method and applications.
Background technology
The current that surface water body is received include sanitary sewage and industrial wastewater, these current after city overland runoff, processing
The particulate material and dissolved matter of middle entrained with, can sink under certain hydraulics and chemistry, biological agent
Drop, is changed into water body deposit.Water body deposit passes through a series of physical such as absorption, complexing, chemical reaction in forming process
Chemical action, the heavy metal for entering water body is gathered together, when the environmental condition of water and Sediment Interface changes, enrichment
Heavy metal contaminants in deposit can be discharged again again, the endogenous pollution as water environment, to water ecological setting
Flowed naturally with current and cause serious threat, Sediment Dredging turns into important ring indispensable in the water environment comprehensive regulation
Section, is also to cut down surface water body endogenous pollution effective manner the most direct.
Cement system dehydration hardener (cement, lime, gypsum and other calcium and magnesium salt, calcium and magnesium oxides) is due to its cheap valency
Lattice, stronger cementitiousness and hydration reaction produce basicity, the static stabilization of inorganic pollution such as heavy metal and turn into
The bottom-mud dewatering curing agent of current more main flow.In addition, also having research based on industrial waste and cement groups such as flyash, waste gypsums
Into part it is similar the characteristics of, by the modified treatment technology applied to bed mud curing/stabilizing of industrial waste.Existing bottom-mud dewatering
Curing technology can improve bed mud mechanical strength to a certain extent, but generally existing dosage is too high that (usual moisture content is more than
90% bed mud weight in wet base 10%), increase-volume may introduce secondary dirt than larger, larger to bed mud pH value coverage, disposal process
Dye, the problems such as cured base mud resource utilization ways are less.And the potential recycling mode of bed mud include firing porous brick,
The generally existing energy-output ratio such as calcining cement clinker is big, treatment scale is small, be difficult to dissolve on a large scale pending bed mud the shortcomings of.
Earth volume needed for express highway roadbed filling is huge, the m of earth volume needed for every kilometer about 6.5 ten thousand3, but the excavation of fresh clay can make
Into soil erosion, vegetation deterioration, the development to the ecological balance and agriculture and forestry all causes totally unfavorable influence.
Dredged bed mud has that yield is big, moisture content is high, heavy metal and persistence organic pollutant content are higher and leach
Risk it is larger wait harm, existing disposal options with rent stockyard temporarily stack based on, fail to realize the efficient resource of Dredged bed mud
Change and utilize, and exist because stacking place does not carry out the pollutant such as heavy metal in Anti-seeping technology, bed mud to surrounding water and soil
Serious risk of environmental pollution.Therefore, for the mechanical property after bed mud solidification and stabilization as engineering construction filling soil
It is required that, developing low-cost, efficient Dredged bed mud dehydrating and curing technology expand Dredged bed mud recycling approach, for
Realize that bed mud safe handling disposal has important application value.
The content of the invention
For the defect of prior art, it is an object of the invention to provide a kind of increase-volume than small, cheap aluminium base gelling
Curing agent.
It is a further object to provide a kind of preparation method of above-mentioned aluminium base gelling curing agent.
Third object of the present invention is to provide a kind of method that Dredged bed mud is disposed using above-mentioned aluminium base gelling curing agent,
Dredged bed mud can be made to obtain recycling as packing material to recycle.
To achieve these goals, the technical solution adopted by the present invention is as follows：
The invention provides a kind of aluminium base gelling curing agent, it is made up of the component of following mass ratio：
Calcium aluminate：Sulphur aluminium cement：Early strong flocculation aid=(1~3):(6.5~8.5):0.5.
CaO, Al in the calcium aluminate2O3Mass fraction ratio is 1:1, molecular formula is 12CaO7Al2O3。
The morning strong flocculation aid is anhydrous CaSO4Or calcium formate.
Present invention also offers a kind of preparation method of above-mentioned aluminium base gelling curing agent, comprise the following steps：
Laboratory preparation method uses cone method：It is (1~3) by mass ratio:(6.5~8.5):0.5 calcium aluminate, sulphur aluminium
Then cement and early strong flocculation aid grinding, sieving, mixed-stacking flatten into coniform, surrounding sample accumulated again to center
Formed after circular cone and flattened, so obtain aluminium base gelling curing agent several times repeatedly；
Industrial production process uses ball mill, and calcium aluminate, sulphur aluminium cement, early strong flocculation aid are fully ground respectively, sieved
After net, according to calcium aluminate：Sulphur aluminium cement：The mass ratio of early strong flocculation aid is (1~3):(6.5~8.5):0.5 directly add in
In Dredged bed mud.
Sieving in the laboratory preparation method is 0.08mm sieve.
Sieving in the industrial production process is 2mm sieve.
Present invention also offers a kind of method that Dredged bed mud is disposed using above-mentioned aluminium base gelling curing agent, including following step
Suddenly：
By the rubbish sandstone separation in the mud of Dredged bed mud, then adding cationic-type polyacrylamide (CPAM) makes to dredge
Bed mud thickening is dredged, aluminium base gelling curing agent is added and mixes, is uniformly mixed while adding water reducer, dehydrating and curing
Stabilisation maintenance is carried out afterwards, and Dredged bed mud reaches roadbed backfill performance requirement after processing.
Moisture content >=95% of the Dredged bed mud.
The dosage of the cationic-type polyacrylamide is the 0.2% of Dredged bed mud wet basis quality.
Moisture content≤90% after the Dredged bed mud thickening.
The dosage of the aluminium base gelling curing agent is 1% of Dredged bed mud wet basis quality after thickening.
The water reducer is naphthalene water reducer, calcium lignosulfonate, polycarboxylate water-reducer or aliphatic water reducing agent.
The dosage of the water reducer is 0.2% of Dredged bed mud wet basis quality after thickening.
The time for stabilizing maintenance is at least 2~10d.
The present invention compared with the existing technology, with advantages below and beneficial effect：
Raw material selected by aluminium base gelling curing agent disclosed by the invention are easy to get, and dosage is low, and increase-volume is than small, and price is low
It is honest and clean, computational methods are matched by MOLECULE DESIGN and obtained.
In the method for the aluminium base gelling curing agent disposal Dredged bed mud of the present invention, CPAM flocculation and hydrophilic group are utilized
Group improves Dredged bed mud water retention property, makes to generate column, fibrous crystal in solidification bed mud system using aluminium base gelling curing agent,
And then intersect anchor ear sediment particles, filling sediment particles gap, enhancing curing system mechanical strength, utilize anhydrous CaSO4Morning
Help solidifying effect to shorten curing age by force, cement granules are increased using the three-dimensional adsorption effect of cement water reducing agent calcium lignosulfonate
Surface Zeta potential, improves decentralization of the aluminium base gelling curing agent in Dredged bed mud system, promotes reaction fully to carry out.
The accurate collaboration that the present invention realizes aluminium base gelling curing agent each component chemical characteristic is utilized, and synchronously realizes dredging
Bed mud water retention property improves, dehydrating and curing and heavy metal stabilization, has reached low dosage, low increase-volume ratio, shorter curing age
The cured modified processing target of Dredged bed mud, it is wide by Dredged bed mud recycling purposes after cured modified processing, realize dredging
The scale safe handling disposal of bed mud.
The present invention is reduced while Dredged bed mud low cost, wide scale security processing disposal is realized with recycling
Ecological disruption and the comsumption of natural resources caused by the fresh clay exploitation of civil engineering, with higher economical, social and environment
Benefit.
Brief description of the drawings
Fig. 1 is the schematic flow sheet of the method for aluminium base of embodiment of the present invention gelling curing agent disposal Dredged bed mud.
Embodiment
The present invention is further detailed explanation for illustrated embodiment below in conjunction with the accompanying drawings.
Preparing raw material used of the invention is technical grade；Calcium aluminate：Wherein CaO, Al2O3Mass fraction ratio is approximately 1:1,
Molecular formula 12CaO7Al2O3。
Embodiment 1
The cured modified processing of Jiaxing City city river Dredged bed mud
(1) prepared by aluminium base gelling curing agent
Laboratory preparation method uses cone method：It is 3 by mass ratio:6.5:0.5 calcium aluminate, sulphur aluminium cement, early help by force
Solidifying agent grinding, crosses 0.08mm sieves, and then mixed-stacking flattens into coniform, and surrounding sample is accumulated to be formed again to center and justified
Flattened after cone, so obtain aluminium base gelling curing agent several times repeatedly；
Industrial production process uses ball mill, and calcium aluminate, sulphur aluminium cement, early strong flocculation aid are fully ground respectively, 2mm is crossed
After screen cloth, according to calcium aluminate：Sulphur aluminium cement：The mass ratio of early strong flocculation aid is 3:6.5:0.5 directly adds in Dredged bed mud.
Early strong flocculation aid is anhydrous CaSO4。
Aluminium base gelling curing agent 150g is prepared as stated above.
(2) the cured modified processing of Dredged bed mud
Dredged bed mud Basic Characteristics the results are shown in Table 1.
Table 1
Fig. 1 is the schematic flow sheet of the method for aluminium base of embodiment of the present invention gelling curing agent disposal Dredged bed mud.Take the institute of table 1
The Dredged bed mud sample of 350g moisture content 98% or so is stated, the rubbish sandstone in the mud of Dredged bed mud is separated, 0.2wt% is added
CPAM after, treat bed mud 1~2h of free settling, skim supernatant, then add aluminium base gelling curing agent obtained in (1)
1wt%, 0.2wt% naphthalene water reducer, are sufficiently stirred for the centrifugal dehydration 10min under the conditions of 5000r/min.
(3) stable maintenance
By the solidification bed mud abandoning supernatant through centrifugal dehydration in (2), solid fraction is closely knit to insert high about 70mm, and diameter is about
In 35mm tubular die, a cylindrical test specimen to be measured is formed, conserves and is stripped after 24h in 25 DEG C of environment, be transferred to room temperature bar
Natural air drying 6d under part, is then pressed《Earthwork test rule》(SL237-1999) correlation technique determines sediment sample without lateral
Compression strength and liquid limit, plastic limit, plasticity index.
(4) the cured modified experimental result of bed mud
Work as calcium aluminate：Sulphur aluminium cement：The mass ratio of early strong flocculation aid is 3:6.5:When 0.5, Dredged bed mud is without side after processing
The maximum for limiting compression strength is 170.81kPa, higher than the unconfined compressive strength 150kPa of engineering clay, is dredged after processing
Bed mud liquid limit is less than 50%, and plasticity index 15.02 is between 15~20.
《Integrated wastewater discharge standard》(GB8978-2002) propose the concept of the first pollutant, by total cadmium, total chromium,
Cr VI, total arsenic, total lead, total nickel etc. can be accumulated in environment or animal and plant body produces long-range dysgenic 13 to health
Plant pollutant and be classified as the first pollutant, the present embodiment is defined with reference to the correlation of the first pollutant, is used《Solid waste is leached
Toxicity leaching method sulfonitric method》(HJ/T299) standard method have detected the heavy metals such as above-mentioned Cd, Cr, As, Pb, Cu, Ni
Leaching, as a result as shown in table 2：
Table 2
| Heavy metal species | As | Cd | Cr | Cu | Ni | Pb | Zn |
| Leaching concentration mg/L | 0.03299 | Do not detect | Do not detect | 0.002684 | Do not detect | Do not detect | Do not detect |
Leaching experiment result shows：Dredged bed mud Leaching of Heavy Metals concentration is less than after processing《Water environment quality standard》
(GB3838-2002) the related limit value of II classes water body, heavy metal free risk of environmental pollution.
Dredged bed mud Mechanics Performance Testing is understood with Leaching of Heavy Metals experimental result after being handled in comprehensive the present embodiment, this hair
Dredged bed mud meets roadbed backfill related performance indicators and wanted after the method processing of bright aluminium base gelling curing agent disposal Dredged bed mud
Ask.
Embodiment 2 --- the cured modified processing pilot experiment of Jiaxing City city river Dredged bed mud
(1) prepared by aluminium base gelling curing agent
Laboratory preparation method uses cone method：It is 1 by mass ratio:8.5:0.5 calcium aluminate, sulphur aluminium cement, early help by force
Solidifying agent grinding, crosses 0.08mm sieves, and then mixed-stacking flattens into coniform, and surrounding sample is accumulated to be formed again to center and justified
Flattened after cone, so obtain aluminium base gelling curing agent several times repeatedly；
Industrial production process uses ball mill, and calcium aluminate, sulphur aluminium cement, early strong flocculation aid are fully ground respectively, 2mm is crossed
After screen cloth, according to calcium aluminate：Sulphur aluminium cement：The mass ratio of early strong flocculation aid is 1:8.5:0.5 directly adds in Dredged bed mud.
Early strong flocculation aid is anhydrous CaSO4。
Aluminium base gelling curing agent 10kg is prepared as stated above.
(2) adding of agent
By the rubbish sandstone separation in the mud of Dredged bed mud, Dredged bed mud and the sedimentation basin leading portion of moisture content 98.3% are thrown
Plus quality for 0.2wt% CPAM mixing after, treat Dredged bed mud free settling concentrate 1~2h, supernatant overflow, using spiral
Dredged bed mud is in mixing and stirring tank after pump pumping 1t concentrations, then adds aluminium base gelling curing agent 10kg, 2kg obtained in (1)
Calcium lignosulfonate, is sufficiently stirred for after filter-press dehydration 15min under 0.6MPa pressure conditions.
(3) stable maintenance
Solidification bed mud through filter-press dehydration in (2) is conserved in 25 DEG C of room temperature environments, natural air drying conserves 2~3d, so
After press《Earthwork test rule》(SL237-1999) Dredged bed mud sample is without lateral pressure resistance after the correlation technique measure is handled
Degree, liquid limit, plastic limit, plasticity index, CBR values, Leaching Heavy Metals.
(4) experimental result
Using《Solid waste Leaching leaching method sulfonitric method》(HJ/T299) standard method have detected Cd, Cr,
The Leaching of the heavy metals such as As, Pb, Cu, Ni, as a result as shown in table 3：
Table 3
| Heavy metal species | As | Cd | Cr | Cu | Ni | Pb | Zn |
| Leaching concentration mg/L | 0.034496 | Do not detect | 0.01422 | 0.01679 | Do not detect | Do not detect | Do not detect |
Leaching experiment result shows：Dredged bed mud Leaching of Heavy Metals concentration is less than after processing《Water environment quality standard》
(GB3838-2002) the related limit value of II classes water body, heavy metal free risk of environmental pollution.
Unconfined compressive strength 172.38kPa, liquid limit 41.68%, plastic limit 23.71%, plasticity index 17.97, CBR5.0Value
11.02%, above mechanical performance index is also satisfied by roadbed backfill related performance indicators requirement.
Embodiment 3 --- the cured modified processing of Shanghai City city river Dredged bed mud
(1) prepared by aluminium base gelling curing agent
Laboratory preparation method uses cone method：It is 2 by mass ratio:7.5:0.5 calcium aluminate, sulphur aluminium cement, early help by force
Solidifying agent grinding, crosses 0.08mm sieves, and then mixed-stacking flattens into coniform, and surrounding sample is accumulated to be formed again to center and justified
Flattened after cone, so obtain aluminium base gelling curing agent several times repeatedly；
Industrial production process uses ball mill, and calcium aluminate, sulphur aluminium cement, early strong flocculation aid are fully ground respectively, 2mm is crossed
After screen cloth, according to calcium aluminate：Sulphur aluminium cement：The mass ratio of early strong flocculation aid is 2:7.5:0.5 directly adds in Dredged bed mud.
Early strong flocculation aid is calcium formate.
Aluminium base gelling curing agent 10kg is prepared as stated above.
(2) adding of agent
By the rubbish sandstone separation in the mud of Dredged bed mud, Dredged bed mud and the sedimentation basin leading portion of moisture content 98% are added
Quality for 0.2wt% CPAM mixing after, treat Dredged bed mud free settling concentrate 1~2h, supernatant overflow, using helicoidal pump
Dredged bed mud is pumped after 1t concentrations in mixing and stirring tank, then adds in (1) obtained aluminium base gelling curing agent 10kg, 2kg gathers
Carboxylic acid water reducer, is sufficiently stirred for after filter-press dehydration 15min under 0.6MPa pressure conditions.
(3) stable maintenance
Solidification bed mud through filter-press dehydration in (2) is conserved in 25 DEG C of room temperature environments, natural air drying conserves 2~3d, so
After press《Earthwork test rule》(SL237-1999) Dredged bed mud sample is without lateral pressure resistance after the correlation technique measure is handled
Degree, liquid limit, plastic limit, plasticity index.
(4) experimental result
Unconfined compressive strength 169.59kPa, liquid limit 34.73%, plastic limit 16.24%, plasticity index 18.49, above power
Learn performance indications and be also satisfied by roadbed backfill related performance indicators requirement.
Embodiment 4 --- the cured modified processing of Jiaxing City suburb lake dredging bottom-mud
(1) prepared by aluminium base gelling curing agent
Laboratory preparation method uses cone method：It is 1 by mass ratio:7.5:0.5 calcium aluminate, sulphur aluminium cement, early help by force
Solidifying agent grinding, crosses 0.08mm sieves, and then mixed-stacking flattens into coniform, and surrounding sample is accumulated to be formed again to center and justified
Flattened after cone, so obtain aluminium base gelling curing agent several times repeatedly；
Industrial production process uses ball mill, and calcium aluminate, sulphur aluminium cement, early strong flocculation aid are fully ground respectively, 2mm is crossed
After screen cloth, according to calcium aluminate：Sulphur aluminium cement：The mass ratio of early strong flocculation aid is 1:7.5:0.5 directly adds in Dredged bed mud.
Early strong flocculation aid is calcium formate.
Aluminium base gelling curing agent 10kg is prepared as stated above.
(2) adding of agent
By the rubbish sandstone separation in the mud of Dredged bed mud, Dredged bed mud and the sedimentation basin leading portion of moisture content 95% are added
Quality for 0.2wt% CPAM mixing after, treat Dredged bed mud free settling concentrate 1~2h, supernatant overflow, using helicoidal pump
Dredged bed mud is in mixing and stirring tank after pumping 1t concentrations, then adds aluminium base gelling curing agent 10kg, 2kg fat obtained in (1)
Fat race water reducer, is sufficiently stirred for after filter-press dehydration 15min under 0.6MPa pressure conditions.
(3) stable maintenance
Solidification bed mud through filter-press dehydration in (2) is conserved in 25 DEG C of room temperature environments, natural air drying conserves 2~3d, so
After press《Earthwork test rule》(SL237-1999) Dredged bed mud sample is without lateral pressure resistance after the correlation technique measure is handled
Degree, liquid limit, plastic limit, plasticity index.
(4) experimental result
Unconfined compressive strength 167.21kPa, liquid limit 35.33%, plastic limit 19.83%, plasticity index 15.5, above mechanics
Performance indications are also satisfied by roadbed backfill related performance indicators requirement.
The above-mentioned description to embodiment is understood that for ease of those skilled in the art and using this hair
It is bright.Person skilled in the art obviously easily can make various modifications to these embodiments, and described herein
General Principle is applied in other embodiment without passing through performing creative labour.Therefore, the invention is not restricted to implementation here
Example, those skilled in the art do not depart from improvement that scope made and change all should be according to the announcement of the present invention
Within protection scope of the present invention.
Claims (6)
1. a kind of method that utilization aluminium base gelling curing agent disposes Dredged bed mud, it is characterised in that：Comprise the following steps：Will dredging
Rubbish sandstone separation in the mud of bed mud, then adding cationic-type polyacrylamide makes Dredged bed mud thickening, adds
Aluminium base gelling curing agent is mixed, and is uniformly mixed while adding water reducer, stabilisation maintenance is carried out after dehydrating and curing；Institute
Aluminium base gelling curing agent is stated, is made up of the component of following mass ratio：Calcium aluminate：Sulphur aluminium cement：Early strong flocculation aid=(1~3):
(6.5~8.5):0.5；The preparation method of the aluminium base gelling curing agent, comprises the following steps：
Using falling cone method：It is (1~3) by mass ratio:(6.5~8.5):0.5 calcium aluminate, sulphur aluminium cement and early strong flocculation aid is ground
Then mill, sieving, mixed-stacking flattens into coniform, and surrounding sample is accumulated to center and forms pressing after circular cone again, so
It is repeatedly available aluminium base gelling curing agent；
Or ball mill is used, calcium aluminate, sulphur aluminium cement, early strong flocculation aid are fully ground respectively, crossed after screen cloth, according to aluminic acid
Calcium：Sulphur aluminium cement：The mass ratio of early strong flocculation aid is (1~3):(6.5~8.5):0.5 directly adds in Dredged bed mud.
2. the method that utilization aluminium base gelling curing agent according to claim 1 disposes Dredged bed mud, it is characterised in that：It is described
Moisture content >=95% of Dredged bed mud.
3. the method that utilization aluminium base gelling curing agent according to claim 1 disposes Dredged bed mud, it is characterised in that：It is described
The dosage of cationic-type polyacrylamide is the 0.2% of Dredged bed mud wet basis quality.
4. the method that utilization aluminium base gelling curing agent according to claim 1 disposes Dredged bed mud, it is characterised in that：It is described
Moisture content≤90% after Dredged bed mud thickening.
5. the method that utilization aluminium base gelling curing agent according to claim 1 disposes Dredged bed mud, it is characterised in that：It is described
The dosage of aluminium base gelling curing agent is 1% of Dredged bed mud wet basis quality after thickening.
6. the method that utilization aluminium base gelling curing agent according to claim 1 disposes Dredged bed mud, it is characterised in that：It is described
Water reducer is naphthalene water reducer, calcium lignosulfonate, polycarboxylate water-reducer or aliphatic water reducing agent；
Or the dosage of the water reducer is 0.2% of Dredged bed mud wet basis quality after thickening；
Or the time for stabilizing maintenance is at least 2~10d.
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| CN106277858B (en) * | 2016-08-16 | 2018-03-16 | 中电建水环境治理技术有限公司 | River lake gush polluted bed mud processing receive micron be modified binder materials |
| CN113526809A (en) * | 2021-07-20 | 2021-10-22 | 深圳市市政工程总公司 | Dredged sediment curing modification method based on organic conditioner |
| CN113526810A (en) * | 2021-07-20 | 2021-10-22 | 深圳市市政工程总公司 | Dredged sediment curing method based on mixed curing agent |
| CN113501635A (en) * | 2021-07-23 | 2021-10-15 | 深圳市天健(集团)股份有限公司 | Environment-friendly dredging and curing modification integrated equipment for dredged sediment |
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| CN101289850A (en) * | 2008-06-03 | 2008-10-22 | 凌贤长 | Saline soil curing agent and technical applications thereof |
| CN102815917A (en) * | 2012-09-06 | 2012-12-12 | 焦作市新筑王材料科技有限公司 | Gas extraction hole sealing material |
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| CN101289850A (en) * | 2008-06-03 | 2008-10-22 | 凌贤长 | Saline soil curing agent and technical applications thereof |
| CN102815917A (en) * | 2012-09-06 | 2012-12-12 | 焦作市新筑王材料科技有限公司 | Gas extraction hole sealing material |
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