CN104108915A - Sintering-free method for preparing bricks from dredged sediment - Google Patents
Sintering-free method for preparing bricks from dredged sediment Download PDFInfo
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Abstract
The invention relates to a sintering-free method for preparing bricks from dredged sediment, which comprises the following steps: collecting the dredged sediment and abandoning the overlaying water; uniformly spraying 2,4,6-trithione-1,3,5-triazine trisodium salt to the dredged sediment, stirring quickly, crushing and grinding the dredged sediment with a pulverizer after naturally airing; screening the sediment with a sieve of 100-150 meshes and then mixing with P.O42.5 cement, natural zeolite and quicklime with the mass ratio of (90-110): (40-60): (5-20): (0.5-5); controlling the water cement mass ratio to be 35-45% at room temperature; pouring into a standard mold and conducting wet curing for 24-48 hours; and then demolding and continuing the curing for 7-90 days to obtain the non-sintered brick. The method provided by the invention has advantages such as simple process, energy conservation, environmental protection, low leachability of heavy metals, high compression strength, high porosity and good adsorption. The non-sintered brick can be used as building materials, and also can adsorb and stabilize heavy metals and organic substances in water.
Description
Technical field
The present invention relates to a kind of method with the non-sintered brickmaking of dredging bed mud, is that the heavy metal in dredging bed mud and effective stabilization bed mud is carried out to recycling.
Background technology
Sewage discharge, atmospheric precipitation are brought into a lot of pollutents in water body, and pollutent is enriched in Sediments by physical chemistry and the effect such as biological, cause in river bottom mud phosphorus and nitrogen, heavy metal etc. seriously polluted.In China, the Caohai of Dianchi Lake polluted bed mud of implementing for 1998 to 1999 is dredged and handling project (first phase) is China's the first large-size lake environmental dredging engineering, removes nearly 4,000,000 m of bed mud
3.Subsequently in Taihu Lake, River, Lake Xingyun, Chaohu, South Lake (Changchun) etc. also carried out environmental dredging engineering.In March, 2012, Suzhou River Sediment Dredging Practical Completion, dredged the about 8000m of earth volume of outward transport average every day
3, dredging bed mud approximately 1,000,000 m
3, all transport the sediment field that is positioned at Nanhui Lao Gang to.The bed mud that the training of channel produces how harmless treatment and recycling has become a difficult problem, conventionally being used as solid waste is deposited in storage mud field, not only take a large amount of soils, this resource of dredging bed mud is caused to huge waste, and environment is produced to secondary pollution.
At present, the patented technology great majority of bed mud brickmaking need to complete under high temperature or calcination condition, as China Patent No. 201210322843.4, and proprietary term: a kind of preparation method of bed mud brick; China Patent No. 201110035907.8, proprietary term: a kind of baked light-weight environmental-friendly bricks and manufacture method thereof of producing with river bottom mud; China Patent No. 201310258221.4, proprietary term: a kind of sludge of sewage treatment plant vitrified brick and preparation method thereof.This kind of mode prepared the building materials of better performances really, met the requirement of resource utilization.But it has not only consumed the more energy in resource utilization, and may make volatile organic contaminant in soil migration occur and change, enter in atmosphere and cause and secondary pollution even produce the carcinogenss such as dioxin.The present invention has proposed to utilize heavy metal severe contamination bed mud to prepare non-sintered brick innovatively, has avoided the energy consumption because of sintering process generation, has reduced pollutants in sediments secondary pollution, has met recycling.
Summary of the invention
The invention discloses a kind of method with the non-sintered brickmaking of dredging bed mud, utilize that material is easy to get, wide material sources, low-cost P.O42.5 cement, using natural clinoptilolite, unslaked lime and water conditioner 2,4,6-tri-thiol-1,3,5-triazine trisodium salt (TMT) is prepared from.Method is simple, reached energy-conserving and environment-protective, Leaching of Heavy Metals is low, ultimate compression strength is high, porosity is high, excellent adsorption, the easily requirement such as scale production, can be used as good embankment material, material of construction; Can also process material as water body, heavy metal, organism in water are had to certain absorption and static stabilization.The present invention has effectively overcome that the energy consumption that prior art exists by sintering brick-making process is high, organic pollutant migration occurs and changes, and causes the drawbacks such as secondary pollution.
Technical solution of the present invention is achieved in that
By a method for the non-sintered brickmaking of dredging bed mud, first 2,4,6-tri-thiol-1,3,5-triazines trisodium salt is evenly sprayed in dredging bed mud, after rapid stirring, add cement, zeolite and unslaked lime, co-treatment heavy metal polluted bed mud; After fully stirring evenly, be cast into mould; Wet type maintenance demoulding after 24-48 hour, continues maintenance 7 days to 90 days; In preparation process, temperature, in room temperature condition, does not heat or calcines, and concrete preparation is carried out in accordance with the following steps:
(1) taking lake dredging bottom-mud as main raw material, bed mud is placed under natural ventilating environment after gathering, and leaves standstill 24-48 hour, removes overlying water;
(2) in bed mud, add heavy metal chelating agent TMT-15,2,4,6-tri-thiol-1,3,5-triazines trisodium salt, addition control is the 5-15% of bed mud dry weight, stirs, under natural condition, weathering is dried, its water ratio <5%;
(3) bed mud of air-dry rear caking, through pulverizer and ball mill crushing grinding, cross 100-150 mesh sieve, collect for subsequent use, by bed mud, P.O42.5 cement, natural zeolite, unslaked lime, according to the ratio of mass ratio 90-110:40-60:5-20:0.5-5 mechanical stirring under room temperature condition, and strictly to control at ambient temperature water ash mass ratio be between 35-45%;
(4) water after mixing and cast from Standard Module, mechanical vibration 5-10 minute, is transferred to wet type maintenance demoulding after 24-48 hour subsequently, continues maintenance 7-90 days, makes non-sintered brick.
Heavy metal chelating agent TMT-15 described in step (2), 2,4, the effective concentration of 6-tri-thiol-1,3,5-triazines trisodium salt is 15-25%.
Natural zeolite described in step (3), selecting virtual mass content is the using natural clinoptilolite of 60%-95%, through crushing grinding, crosses 100-200 mesh sieve for subsequent use.
Unslaked lime described in step (3) is 200 object calcium lime powders, and calcium oxide virtual mass content is 75-98%.
Mechanical stirring described in step (3), is to utilize the first low rate mixing of cement mixer 3 minutes, then rapid stirring 2 minutes, finally low rate mixing 10 minutes again.
Mechanical vibration described in step (4) are that mould is placed in to mechanical vibration on shaking table, until inner stuffing compacting, amplitude is 0-5mm.
Wet type maintenance described in step (4) is humidity >95%, and temperature is controlled in 19.5-20.5 DEG C.
The present invention makes non-sintered brick, nothing heating or calcination condition in preparation process.Maintenance 28 days, unconfined compression strength reaches 10MPa; After maintenance 90 days, unconfined compression strength is greater than 15MPa.The frost resistance of non-sintered brick, crimping ratio, visual appearance, water-intake rate, strength grade etc., all meet corresponding requirements in CECS257-2009 " concrete brick Building technology specification " and NY/T671-2003 " concrete solid brick and decorative block ".
Raw material of the present invention also can be made perforated brick, revetment brick by different moulds, plant raw brick, hollow block and pavement bricks etc.
The present invention has following advantage and beneficial effect:
(1) the equal wide material sources of raw material in preparation, cheap and easy to get, environmental friendliness.Main raw is heavy metal contamination dredging bed mud, material of construction (cement, zeolite, unslaked lime), heavy metal chelating agent (TMT-15), in experimental implementation or production practice, can not work the mischief or produce by product environment.Meanwhile, avoid sintering process, reduced the risk of secondary pollution.
(2) Leaching of Heavy Metals concentration is low.Through hydrolysis and the hydration reaction of cement, the ion-exchange of zeolite, the chelating precipitation of TMT-15, and unslaked lime impels the effects such as heavy metal precipitation by increasing pH, reduced greatly leaching ability of heavy metal.
(3) physical strength is good.Bed mud, cement, zeolite, unslaked lime etc. make non-burning brick, after cement solidification, have reached higher unconfined compression strength, meet material of construction brick standard, special standby is to have added unslaked lime, make its early epistasis obtained further reinforcement, increased the mechanical strength of non-sintered brick.
(4) porosity is higher.Mechanical stirring with become in mold process, due to flowing of free water in inclusion of air and mixed slurry, formed micro-pore and hole in various degree.In addition, the zeolite of interpolation itself is exactly a kind of porous material.
(5) can serve as good material for water treatment.Good porosity makes it have detention and evolution effect, and bed mud and zeolite have certain absorption property, has certain water quality evolution effect.
(6) energy-saving and emission-reduction, resource reusing.Effectively solve the problem of solid waste processing, can meet the demand of material of construction simultaneously, belonged to green structural material.
(7) preparation technology is simple, easily large-scale production.Whole preparation in non-sintered brick technique, room temperature is carried out, and without pressurization and heating installation, environment harmful and pollutent produce less, and technical process is simple, easily realizes automated operation, is applicable to scale operation.
Embodiment
Below in conjunction with embodiment, the present invention is described in detail, but embodiment is not limited to the present invention, and all employings similarity method of the present invention and similar variation thereof, all should list protection scope of the present invention in.
[embodiment 1]
Gather the bed mud that the dredgings such as navigation channel, irrigation canals and ditches, (along the river/sea) harbour, dock produce, after standing, ageing, impurity elimination, sterilization, to add in bed mud effective concentration be 15% 2,4,6-tri-thiol-1,3,5-triazine trisodium salt (TMT-15) solution, addition is 5% of dry bottom shale amount.More than mechanical stirring 5min, until mix.After weathering, be exposed to the sun etc. is processed, controlling bed mud water ratio is 1%-5%, if water ratio exceedes 5%, need to carry out in time drying and processing again.Recycling pulverizer, ball mill, screen cloth carry out after fragmentation, ball milling, sorting, select 100-150 object sediment particles stand-by.
Air-dry bed mud, P.O42.5 cement, clinoptilolite powder, unslaked lime, in mass ratio for 100:45:10:1.5 mixes, are added water water ash mass ratio is adjusted to 35-45%.Mechanical stirring under room temperature condition, first low rate mixing 3 minutes, then rapid stirring 2 minutes, finally low rate mixing 10 minutes again.Mould is fixed on shaking table, and adjustment amplitude is 0-5mm.Bed mud mixture slurry is divided to water for three times cast from mould, and with perching knife, mould inner wall is smash slottingly, get rid of slurry inner air, make its rapid jolt ramming.Time of vibration was generally advisable with 3-5 minute, avoided time of vibration long, caused and shook.Mold removal, is put in cement protecting box and carries out wet type maintenance, keeps humidity >95%, and temperature is controlled in 19.5-20.5 DEG C.After 24 hours, remove mould, continue wet type maintenance 7-90 days.Non-sintered brick specification is 240mm × 115mm × 53mm.
Bed mud slurry is made in 70.7 × 70.7 × 70.7mm mould, on pressure-proof and snap-resistent all-in-one, carry out mechanical property detection, experimental result is as shown in table 1: 28 days mean compressive strengths meet the standard of load-bearing MU10 and non-bearing MU7.5 in NYT671-2003 " concrete solid brick and decorative block " standard; 90 days mean compressive strengths reach the standard of load-bearing MU15 and non-bearing MU7.5, meet GB/T24493-2009 " decorative coagulation cob brick " MU15 standard value simultaneously.Fragment of brick density is 1680-1800kg/m
3; Porosity 24.3%; Water-absorbent 7.2-9.8%; Article two, face difference of altitude 1.8-2.5mm, three of losing fangle are destroyed size 8-15mm, and crack length is less than 23mm, and complete more than a face and an end face; Size average deviation 2.1mm, extreme difference is less than 7mm.Meet NYT671-2003 " concrete solid brick and decorative block " acceptable end product standard value.
Table 1 non-sintered brick mechanical strength
According to HJ/T299-2007 " solid waste Leaching leaching method sulfuric acid nitrate method " and HJ/T300-2007 " solid waste Leaching leaching method hac buffer method ", bed mud is carried out to Leaching of Heavy Metals experiment, result is as shown in table 2.
Table 2 bed mud heavy metal content
| Leaching of Heavy Metals | Cu | Cd | Pb | Zn | Cr |
| Content (mg/kg) | 556.581 | 8.612 | 241.071 | 367.722 | 94.641 |
| HJ/T299-2007(mg/L) | 2.026 | 0.342 | 0.864 | 0.742 | 0.846 |
| HJ/T300-2007(mg/L) | 1.521 | 0.314 | 1.438 | 1.876 | 0.697 |
Same procedure, utilize HJ/T299-2007 " solid waste Leaching leaching method sulfuric acid nitrate method " and HJ/T300-2007 " solid waste Leaching leaching method hac buffer method ", non-sintered brick is carried out Leaching of Heavy Metals experiment and compared with concerned countries standard, and result is as shown in table 3.
Table 3 non-sintered brick leachability and concerned countries standard
-represent to detect; In GB5749-2006, Cr leaching concentration refers to Cr
6+concentration.
Two kinds of leachability detection methods are obtained a result and are met GB5085.3-2007 " Hazardous wastes judging standard leaching characteristic identification " simultaneously, GB16889-2008 " household refuse landfill sites pollution control criterion ", CJ343-2010 " sewage enters town sewer water quality standard " A grade, GB8978-1996 " integrated wastewater discharge standard " primary standard and GB5749-2006 " drinking water sanitary standard ".Prove that its Leaching of Heavy Metals is extremely low, in the physical environment exposing, generally, do not there is harm for physical environment.
Utilize acetum preparation pH=3.5, under simulating natural condition, strong acid rain condition condition, carries out leachability detection.Its leaching concentration reaches GB5085.3-2007 " Hazardous wastes judging standard leaching characteristic identification ", GB16889-2008 " household refuse landfill sites pollution control criterion ", CJ343-2010 " sewage enters town sewer water quality standard " A grade, GB8978-1996 " integrated wastewater discharge standard " primary standard.If meet strong acid rainy day gas, need to do certain precautionary measures, in order to avoid rainwater enters domestic water system.If rainwater enters sewage network or town sewer, without doing pre-treatment.
In addition, non-sintered brick prepared by the present invention can be used in water treatment, and stronger to ammonia nitrogen absorption ability in water, clearance reaches more than 80%; COD is had to certain removal effect, be mainly manifested in and hold back and adsorb; PH regulator, in the time of 6-8, also has absorption to a certain degree to heavy metals such as Pb, Cu, Cd in sewage.
[embodiment 2]
Concrete preparation process is with embodiment 1.
Dredging bed mud is added to heavy metal chelating agent 2,4,6-tri-thiol-1,3,5-triazine trisodium salt, the mass ratio that is 100:45:10:1.5 according to dry bottom mud, 425# ordinary Portland cement, zeolite, unslaked lime mixes, molding moulding, maintenance demoulding after 1 day, wet type maintenance 7-90 days.Non-sintered brick specification is 240mm × 115mm × 53mm.
Detect through mechanical property: within 7 days, mean compressive strength is: 4.3MPa, folding strength: 1.0MPa; 28 days mean compressive strengths are 10.2MPa, and folding strength 2.1Mpa meets the standard of load-bearing MU10 and non-bearing MU7.5 in NYT671-2003 " concrete solid brick and decorative block " standard; 90 days mean compressive strengths are 15.6MPa, folding strength 2.9MPa, the standard that reaches load-bearing MU15 and non-bearing MU7.5 in NYT671-2003 " concrete solid brick and decorative block " standard meets GB/T24493-2009 " decorative coagulation cob brick " MU15 standard value simultaneously.And fragment of brick visual appearance, size deviation, water-absorbent etc. are conformance with standard all.
According to HJ/T299-2007 " solid waste Leaching leaching method sulfuric acid nitrate method ", in bed mud, Pb leaching concentration is 0.006mg/L, and Cd inspection does not measure, and Cr leaching concentration is 0.002mg/L, Cu leaching concentration is 0.015mg/L, and Zn leaching concentration is 0.007mg/L.According to HJ/T300-2007 " solid waste Leaching leaching method hac buffer method ", bed mud is carried out to Leaching of Heavy Metals experiment, in bed mud, Pb leaching concentration is 0.008mg/L, Cd leaching concentration is 0.001mg/L, Cr leaching concentration is 0.005mg/L, Cu leaching concentration is 0.026mg/L, and Zn leaching concentration is 0.009mg/L.The two detected result meets GB5085.3-2007 " Hazardous wastes judging standard leaching characteristic identification " simultaneously, GB16889-2008 " household refuse landfill sites pollution control criterion ", CJ343-2010 " sewage enters town sewer water quality standard " A grade, GB8978-1996 " integrated wastewater discharge standard " primary standard and GB5749-2006 " drinking water sanitary standard ".Prove that its Leaching of Heavy Metals is extremely low, in the physical environment exposing, generally, do not there is harm for physical environment.
Utilize acetum preparation pH=3.5, under simulating natural condition, strong acid rain condition condition, carries out leachability detection, Pb leaching concentration is 0.028mg/L, and Cd leaching concentration is 0.005mg/L, and Cr leaching concentration is 0.034mg/L, Cu leaching concentration is 0.092mg/L, and Zn leaching concentration is 0.042mg/L.Reach GB5085.3-2007 " Hazardous wastes judging standard leaching characteristic identification ", GB16889-2008 " household refuse landfill sites pollution control criterion ", CJ343-2010 " sewage enters town sewer water quality standard " A grade and GB8978-1996 " integrated wastewater discharge standard " primary standard.If meet strong acid rainy day gas, need to do certain precautionary measures, in order to avoid rainwater enters domestic water pipe network.If rainwater enters sewage network, without doing pre-treatment.
In addition, non-sintered brick prepared by the present invention can be used in water treatment, and stronger to ammonia nitrogen absorption ability in water, clearance reaches more than 80%; COD is had to certain removal effect, be mainly manifested in and hold back and adsorb; PH regulator, in the time of 6-8, also has absorption to a certain degree to heavy metals such as Pb, Cu, Cd in sewage.
[embodiment 3]
Concrete preparation process is with embodiment 1.
Dredging bed mud is added to TMT-15, and dry bottom mud, 425 type cement, zeolite, unslaked lime mix according to the mass ratio of 100:45:10:1.5, molding moulding, maintenance demoulding after 1 day, wet type maintenance 7-90 days.Non-sintered brick specification is 240mm × 115mm × 53mm.Detect through mechanical property the standard that 28 days mean compressive strengths meet load-bearing MU10 and non-bearing MU7.5 in NYT671-2003 " concrete solid brick and decorative block " standard; 90 days mean compressive strengths reach the standard of load-bearing MU15 and non-bearing MU7.5, meet GB/T24493-2009 " decorative coagulation cob brick " MU15 standard value simultaneously.According to HJ/T299-2007 " solid waste Leaching leaching method sulfuric acid nitrate method ", in bed mud, Pb leaching concentration is 0.006mg/L, and Cd inspection does not measure, and Cr leaching concentration is 0.002mg/L, Cu leaching concentration is 0.015mg/L, and Zn leaching concentration is 0.007mg/L.According to HJ/T300-2007 " solid waste Leaching leaching method hac buffer method ", bed mud is carried out to Leaching of Heavy Metals experiment, in bed mud, Pb leaching concentration is 0.008mg/L, Cd leaching concentration is 0.001mg/L, Cr leaching concentration is 0.005mg/L, Cu leaching concentration is 0.026mg/L, and Zn leaching concentration is 0.009mg/L.Meet the requirement of concerned countries standard.Non-sintered brick prepared by the present invention can be used in water treatment, and stronger to ammonia nitrogen absorption ability in water, clearance reaches more than 80%; COD is had to certain removal effect, be mainly manifested in and hold back and adsorb; PH regulator, in the time of 6-8, also has absorption to a certain degree to heavy metals such as Pb, Cu, Cd in sewage.
[embodiment 4]
Concrete preparation process is with embodiment 1.
Dredging bed mud is added to the series of preprocessing such as TMT-15, P.O42.5 cement dosage is that 450g/kg dry bottom mud, natural zeolite dosage are that 100g/kg dry bottom mud, unslaked lime dosage are 100g/kg dry bottom mud, mixes molding moulding, maintenance demoulding after 1 day, wet type maintenance 7-90 days.Non-sintered brick specification is 240mm × 115mm × 53mm.Detect through mechanical property the standard that 28 days mean compressive strengths meet load-bearing MU10 and non-bearing MU7.5 in NYT671-2003 " concrete solid brick and decorative block " standard; 90 days mean compressive strengths reach the standard of load-bearing MU15 and non-bearing MU7.5, meet GB/T24493-2009 " decorative coagulation cob brick " MU15 standard value simultaneously.According to HJ/T299-2007 " solid waste Leaching leaching method sulfuric acid nitrate method ", in bed mud, Pb leaching concentration is 0.006mg/L, and Cd inspection does not measure, and Cr leaching concentration is 0.002mg/L, Cu leaching concentration is 0.015mg/L, and Zn leaching concentration is 0.007mg/L.According to HJ/T300-2007 " solid waste Leaching leaching method hac buffer method ", bed mud is carried out to Leaching of Heavy Metals experiment, in bed mud, Pb leaching concentration is 0.008mg/L, Cd leaching concentration is 0.001mg/L, Cr leaching concentration is 0.005mg/L, Cu leaching concentration is 0.026mg/L, and Zn leaching concentration is 0.009mg/L.Meet the requirement of concerned countries standard.Non-sintered brick prepared by the present invention can be used in water treatment, and stronger to ammonia nitrogen absorption ability in water, clearance reaches more than 80%; COD is had to certain removal effect, be mainly manifested in and hold back and adsorb; PH regulator, in the time of 6-8, also has absorption to a certain degree to heavy metals such as Pb, Cu, Cd in sewage.
[embodiment 5]
Concrete preparation process is with embodiment 1.
After bed mud collection, add the series of preprocessing such as TMT-15, make bed mud water ratio lower than 5%, particle diameter is less than 1mm.In every kilogram of bed mud, add P.O42.5 cement 450g, Zeolite Addition 100g, add unslaked lime 100g, mix, molding moulding, maintenance demoulding after 1 day, wet type maintenance 7-90 days.Non-sintered brick specification is 240mm × 115mm × 53mm.Detect through mechanical property the standard that 28 days mean compressive strengths meet load-bearing MU10 and non-bearing MU7.5 in NYT671-2003 " concrete solid brick and decorative block " standard; 90 days mean compressive strengths reach the standard of load-bearing MU15 and non-bearing MU7.5, meet GB/T24493-2009 " decorative coagulation cob brick " MU15 standard value simultaneously.According to HJ/T299-2007 " solid waste Leaching leaching method sulfuric acid nitrate method " and HJ/T300-2007 " solid waste Leaching leaching method hac buffer method ", bed mud is carried out to Leaching of Heavy Metals experiment, in bed mud, Pb, Cd, Cr, Cu, Zn leaching concentration meet the requirement of concerned countries standard.If meet strong acid rainy day gas, need to do certain precautionary measures, in order to avoid rainwater enters domestic water pipe network.If rainwater enters sewage network, without doing pre-treatment.Non-sintered brick prepared by the present invention can be used in water treatment, and stronger to ammonia nitrogen absorption ability in water, clearance reaches more than 80%; COD is had to certain removal effect, be mainly manifested in and hold back and adsorb; PH regulator, in the time of 6-8, also has absorption to a certain degree to heavy metals such as Pb, Cu, Cd in sewage.
[embodiment 6]
Concrete preparation process is with embodiment 1.
After bed mud collection, add the stable wherein heavy metal of TMT-15, then pass through series of preprocessing, as removal of impurities, air-dry, sieve etc.Making bed mud moisture control is good in 1% left and right, and particle diameter is less than 1mm.By bed mud 1000g, P.O42.5 cement 450g, zeolite 100g, unslaked lime 100g mechanical stirring, until evenly, molding moulding, maintenance demoulding after 1 day, natural curing 7-90 days.Non-sintered brick specification is 240mm × 115mm × 53mm.Detect through mechanical property the standard that 28 days mean compressive strengths meet load-bearing MU10 and non-bearing MU7.5 in NYT671-2003 " concrete solid brick and decorative block " standard; 90 days mean compressive strengths reach the standard of load-bearing MU15 and non-bearing MU7.5, meet GB/T24493-2009 " decorative coagulation cob brick " MU15 standard value simultaneously.According to HJ/T299-2007 " solid waste Leaching leaching method sulfuric acid nitrate method " and HJ/T300-2007 " solid waste Leaching leaching method hac buffer method ", bed mud is carried out to Leaching of Heavy Metals experiment, in bed mud, Pb, Cd, Cr, Cu, Zn leaching concentration meet the requirement of concerned countries standard.If meet strong acid rainy day gas, need to do certain precautionary measures, in order to avoid rainwater enters domestic water pipe network.If rainwater enters sewage network, without doing pre-treatment.Non-sintered brick prepared by the present invention can be used in water treatment, and stronger to ammonia nitrogen absorption ability in water, clearance reaches more than 80%; COD is had to certain removal effect, be mainly manifested in and hold back and adsorb; PH regulator, in the time of 6-8, also has absorption to a certain degree to heavy metals such as Pb, Cu, Cd in sewage.
[embodiment 7]
Concrete preparation process is with embodiment 1.
After bed mud collection, add the stable wherein heavy metal of TMT-15, then pass through series of preprocessing, as removal of impurities, air-dry, sieve etc.Making bed mud moisture control is good in 1% left and right, and particle diameter is less than 1mm.By 1000g bed mud, 450gP.O42.5 cement, 100g zeolite, 100g unslaked lime mechanical stirring, until evenly, molding moulding, maintenance demoulding after 1 day, natural curing 7-90 days.Non-sintered brick specification is 240mm × 115mm × 53mm.Detect 28,90 days mean compressive strengths through mechanical property and meet NYT671-2003 " concrete solid brick and decorative block " and wherein part of standards of GB/T24493-2009 " decorative coagulation cob brick ".According to HJ/T299-2007 " solid waste Leaching leaching method sulfuric acid nitrate method " and HJ/T300-2007 " solid waste Leaching leaching method hac buffer method ", bed mud is carried out to Leaching of Heavy Metals experiment, in bed mud, Pb, Cd, Cr, Cu, Zn leaching concentration meet the requirement of concerned countries standard.Non-sintered brick prepared by the present invention can be used in water treatment, and stronger to ammonia nitrogen absorption ability in water, clearance reaches more than 80%; COD is had to certain removal effect, be mainly manifested in and hold back and adsorb; The heavy metals such as Pb, Cu, Cd in sewage are also had to absorption to a certain degree.
[embodiment 8]
Concrete preparation process is with embodiment 1.
After bed mud collection, add the stable wherein heavy metal of heavy metal chelating agent TMT, then pass through series of preprocessing, as removal of impurities sterilizing, be air-dryly exposed to the sun, cross 100-150 mesh sieve etc.Make bed mud moisture control at 1%-5%.Bed mud, P.O42.5 cement, zeolite, unslaked lime are added and mixed with reference to the mass ratio of 1:0.45:0.1:0.0015, until evenly, molding moulding, maintenance demoulding after 24 hours, maintenance 7-90 days under state of nature, makes non-burning brick.Detect 28,90 days mean compressive strengths through mechanical property and meet concerned countries standard.Bed mud is carried out to Leaching of Heavy Metals experiment, and in bed mud, Pb, Cd, Cr, Cu, Zn leaching concentration meet the requirement of concerned countries standard.Non-sintered brick prepared by the present invention can be used in water treatment, and stronger to ammonia nitrogen absorption ability in water, clearance reaches more than 80%; COD is had to certain removal effect, be mainly manifested in and hold back and adsorb; The heavy metals such as Pb, Cu, Cd in sewage are also had to absorption to a certain degree.
[embodiment 9]
Concrete preparation process is with embodiment 1.
After bed mud collection, add the stable wherein heavy metal of heavy metal chelating agent TMT, then pass through series of preprocessing, as removal of impurities sterilizing, be air-dryly exposed to the sun, cross 100-150 mesh sieve etc.Make bed mud moisture control at 1%-5%.Bed mud, P.O42.5 cement, zeolite, unslaked lime are added and mixed with reference to the mass ratio of 1:0.45:0.1:0.0015, until evenly, molding moulding, maintenance demoulding after 24 hours, maintenance 7-90 days under state of nature, be prepared into walkway paving brick, perforated brick, revetment brick etc., have good mechanical strength and lower nuisance leachability.
Claims (7)
1. by a method for the non-sintered brickmaking of dredging bed mud, it is characterized in that: first 2,4,6-tri-thiol-1,3,5-triazines trisodium salt is evenly sprayed in dredging bed mud, after rapid stirring, adds cement, zeolite and unslaked lime, co-treatment heavy metal polluted bed mud; After fully stirring evenly, be cast into mould; Wet type maintenance demoulding after 24-48 hour, continues maintenance 7 days to 90 days; In preparation process, temperature, in room temperature condition, does not heat or calcines, and concrete preparation is carried out in accordance with the following steps:
(A) taking lake dredging bottom-mud as main raw material, bed mud is placed under natural ventilating environment after gathering, and leaves standstill 24-48 hour, removes overlying water;
(B) in bed mud, add 2,4,6-tri-thiol-1,3,5-triazines trisodium salt, addition control is the 5-15% of bed mud dry weight, stirs, and under natural condition, weathering is dried, its water ratio <5%;
(C) bed mud of air-dry rear caking, through pulverizer and ball mill crushing grinding, cross 100-150 mesh sieve, collect for subsequent use, by bed mud, P.O42.5 cement, natural zeolite, unslaked lime, according to the ratio of mass ratio 90-110:40-60:5-20:0.5-5 mechanical stirring under room temperature condition, and strictly to control at ambient temperature water cement ratio mass ratio be between 35-45%;
(D) water after mixing and cast from Standard Module, mechanical vibration 5-10 minute, is transferred to wet type maintenance demoulding after 24-48 hour subsequently, continues maintenance 7-90 days, makes non-sintered brick.
2. the method with the non-sintered brickmaking of dredging bed mud according to claim 1, is characterized in that: 2,4 described in step (B), the effective concentration of 6-tri-thiol-1,3,5-triazines trisodium salt is 15-25%.
3. the method with the non-sintered brickmaking of dredging bed mud according to claim 1, it is characterized in that: the natural zeolite described in step (C) is selected the using natural clinoptilolite of virtual mass content 60%-95%, through crushing grinding, cross 100-200 mesh sieve for subsequent use.
4. the method with the non-sintered brickmaking of dredging bed mud according to claim 1, is characterized in that: the unslaked lime described in step (C) is 200 object calcium lime powders, and calcium oxide virtual mass content is 75-98%.
5. the method with the non-sintered brickmaking of dredging bed mud according to claim 1, it is characterized in that: the mechanical stirring described in step (C) is to utilize the first low rate mixing of cement mixer 3 minutes, rapid stirring 2 minutes again, finally low rate mixing 10 minutes again.
6. the method with the non-sintered brickmaking of dredging bed mud according to claim 1, is characterized in that: the mechanical vibration described in step (D) are that mould is placed in to mechanical vibration on shaking table, until inner stuffing compacting, amplitude is 0-5mm.
7. the method with the non-sintered brickmaking of dredging bed mud according to claim 1, is characterized in that: the wet type maintenance described in step (D) refers to humidity >95%, and temperature is controlled in 19.5-20.5 DEG C.
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| CN105948801A (en) * | 2016-05-03 | 2016-09-21 | 上海理工大学 | Method for preparing porous adsorption material by adopting dredged sediment |
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| CN105948801A (en) * | 2016-05-03 | 2016-09-21 | 上海理工大学 | Method for preparing porous adsorption material by adopting dredged sediment |
| CN106045420A (en) * | 2016-06-02 | 2016-10-26 | 上海理工大学 | Method for preparing foam sludge bricks from dredged sludge |
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| WO2020118804A1 (en) * | 2018-12-10 | 2020-06-18 | 天津科技大学 | Method for producing water permeable brick using dredged sediment firing-free aggregate |
| CN111330547A (en) * | 2020-03-12 | 2020-06-26 | 河北工业大学 | Non-fired adsorbent for removing organic pollutants in water body based on iron-containing solid waste |
| CN111330547B (en) * | 2020-03-12 | 2020-10-27 | 河北工业大学 | Non-fired adsorbent for removing organic pollutants in water body based on iron-containing solid waste |
| CN112851082A (en) * | 2021-01-29 | 2021-05-28 | 珠江水利委员会珠江水利科学研究院 | Riverbed bottom mud ecological restoration bed and preparation method thereof |
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