CN102060428A - Silt curing agent and preparation method thereof - Google Patents

Silt curing agent and preparation method thereof Download PDF

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Publication number
CN102060428A
CN102060428A CN 201010546292 CN201010546292A CN102060428A CN 102060428 A CN102060428 A CN 102060428A CN 201010546292 CN201010546292 CN 201010546292 CN 201010546292 A CN201010546292 A CN 201010546292A CN 102060428 A CN102060428 A CN 102060428A
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CN
China
Prior art keywords
curing agent
slag
sludge curing
sludge
percent
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CN 201010546292
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Chinese (zh)
Inventor
谢国华
杜河清
闫晓满
冯少龙
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广州市水电建设工程有限公司
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Priority to CN 201010546292 priority Critical patent/CN102060428A/en
Publication of CN102060428A publication Critical patent/CN102060428A/en

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Abstract

The invention discloses a silt curing agent and a preparation method thereof. The using amount of the curing agent can be saved and continuous operation is realized simultaneously. The silt curing agent comprises the following components of: 5 to 15 percent of electric furnace steel slag (EFSS), 5 to 15 percent of blast furnace cinder (OPCC), 20 to 45 percent of granulated blast furnace slag (GBFS), 20 to 45 percent of flue gas desulfurization slag (FGDS) and 4 to 16 percent of activator. The preparation method comprises the following steps of: (1) mixing the components and drying in a heating furnace for 3 to 6 hours; and (2) grinding in a grinder in which a backmixing device is arranged, and feeding partial curing agent into a feeding port and mixing with newly added components through the backmixing device. The curing agent can be used for building road base soil or curing silt produced by dredging rivers, lakes, dredged canals to prepare civil materials. The invention has the advantages that: the curing agent is good in curing effect and favorable for environment friendliness, the using amount is saved and the continuous operation can be realized.

Description

A kind of sludge curing agent and preparation method thereof
Technical field
The present invention relates to a kind of solidifying agent, particularly a kind of solidifying agent that can be used for curing sludge; The invention still further relates to a kind of preparation method of sludge curing agent.
Background technology
Mud is the alluviation land resources that is made of very tiny particulate, includes tiny sandstone particulate, and mud particulate and weight are no more than 10% small bits of clay.Because mud particulate viscosity is weak and active low, generally is not suitable for building motorway.Therefore, this mud be stablized and the sandstone additive must be added.Cement, lime, dust, organic polymer and mixture are widely used as stablizer always.After adding stablizer to go into sandstone, can produce a series of chemical reaction such as pozzolanic reaction, ion-exchange, flocculation, carbonation, crystallization and dissociative reaction.These increased response between the particulate connection power and fill space between particulate, can improve engineering attribute such as the intensity and the flintiness of soil.
Chinese patent 200810236713.2 discloses a kind of sludge curing agent, described sludge curing agent is by slag, cement clinker, lime, gypsum and other recombiners are formed, its advantage is, stablizing of the product energy guarantee system that decomposes in the cement, its cured granulate and silt soil particle can be filled mutually, form packed structures the most closely, make the pedosphere system form packed structures closely, its solidifying agent particle and silt soil particle can be filled mutually, form packed structures the most closely, what make soil solidification system formation different levels is that performance is higher than the conventional cement of direct employing and other cement-based solidified materials from close body.But its weak point is, needs to adopt the raw material of cement clinker as solidifying agent, pollutes easily, and uneconomical.
Summary of the invention
Technical problem to be solved by this invention provides a kind of sludge curing agent, curing sludge that can be easily and fast.
The present invention also provides a kind of preparation method of sludge curing agent, realizes operate continuously when can save hardener dose.
Sludge curing agent of the present invention, its component comprises:
Electric furnace slag (EFSS) 5-15%
Blast-furnace slag (OPCC) 5-15%
Mechanochemistry activation slag micropowder (GBFS) 20-45%
Semi-dry process flue gas desulphurization technology desulfurization slag (FGDS) 25-45%
Activator (activator) 4-16%.
In addition, used activator is vitriol or sulphite activator in its sludge curing agent, and described vitriol is sodium sulfate, sal epsom or Tai-Ace S 150, and described sulphite is S-WAT, magnesium sulfite or aluminium sulfite; Also comprise gypsum in its component, described gypsum is plaster stone or dehydrated gyp-.
A kind of preparation method of sludge curing agent, its step comprises: (1) mixes the back in stoving oven dry 3-6 hour with component; (2) change in the shredder and mill, be provided with the back-mixing device in the described shredder, and utilize the back-mixing device with partly solidified dose send back to the feeding mouth place and with newly add component and mix.
Described sludge curing agent can be used as the application of the solidifying agent of building roadbase soil, also can be used for that the river is gushed, lake, the water channel dredging sludge solidification that desilting produced prepare civil material.
Slag in the raw material of the present invention, slag also have a variety of according to the source, as refine remaining slag behind ferrochrome, ferromanganese, the ferrophosphorus, wherein, blast-furnace slag (OPCC) is a remaining defective material behind the blast furnace ironmaking, mechanochemistry activation micro mist (GBFS) for blast-furnace slag through pulverizing the thing after levigate; The lime-ash that semi-dry process flue gas desulphurization technology desulfurization slag (FGDS) produces for means of flue gas desulfurization of power plant, main component is calcium sulfate and calcium sulfite, its initial admixture is sulfur-containing smoke gas and sweetening agent, sweetening agent be generally lime powder, magnesium powder, ammoniacal liquor or other can be used in and the chemical substance of sulfurous gas, mainly play the purpose of utilization of waste material; The character of slag and source also have multiple, mainly comprise hot application slag, hot slag stewing, cold waste, the wind slag etc. of quenching, and the adding of gypsum mainly is to handle the negative factor that organic content is brought in the mud, and it also has the effect that absorbs moisture; Activator mainly plays the effect of alkaline excitation.
Sludge curing agent of the present invention, its advantage is as follows:
1. adopt the basic material as solidifying agent such as blast-furnace slag, electric furnace slag, gypsum, be equipped with chemical activator again and make the solidifying agent that does not contain cement, can overcome and adopt the shortcoming that cement is poor as the solidification effect that base mateiral brought, adaptability is not strong;
2. the waste that adopts steel-making, ironmaking is as raw material, can realize utilization of waste material, reduce the mud waste disposal that produces in the engineering to the pollution of surrounding environment and help environmental protection;
3. the sludge treatment of the river being gushed, producing in the lake is a civil material, can reach the advantage and the low price of resource regeneration.
According to industrial solid wastes can be activated coagulate hardware features, prepare novel gelled material according to this speciality in the project and can partially or completely replace traditional gelling material such as cement, lime solidifying and stablize.
5. adopt the back-mixing device, can deliver to feeding mouth again with partly solidified dose, add curing agent component then, save materials when it is mixed.
Embodiment
A kind of sludge curing agent, the starting material of solidifying agent are pressed following parts by weight, slag micropowder GBFS, electric furnace slag EFSS, semi-dry process flue gas desulphurization technology desulfurization slag FGDS, sulphite or vitriol activation alkaline slag micro mist, gypsum is a dihydrate gypsum.According to testing laboratory and on-the-spot test, utilize industrial solid wastes to prepare type material and to be used for the effect conclusion of curing sludge as follows:
1. utilize semi-dry process flue gas desulphurization technology desulfurization slag FGDS, slag micropowder GBFS, electric furnace slag EFSS, it is feasible that blast-furnace slag OPCC and semi-dry process flue gas desulphurization technology desulfurization slag (FGDS) prepare gelling material.35% EFSS, 34%GBFS, 10%OPCC and 10% gypsum can mix to grind the preparation gelling material and can be used as the sandstone sludge solidification and close stablizer.
2. the hardener of preparation gelling material is shaped on two main points: sulphite or vitriol activation alkaline slag micro mist; The hydrated product of the manufacturing of cement-slag hydro-combination process.
3. through the stable solidified mud sandstone that reach of sludge curing agent, its intensity and flintiness all meet the requirement of subgrade and pavement.
Embodiment 1
Placement FGDS and EFSS material are milled with aluminum oxide one evening of 105 ℃ of oven dry of microwave oven and in porcelain ball mill and are made its surface-area reach 350M 2/ KG, grind sample such as cement-slag, lime, slag micropowder, blast-furnace slag and a reaction desired additives is put into ball mill make the finished product, the fineness of finished product, the dosage of reaction process additive changes to some extent according to the difference of expecting final gelling material, and its composition is specifically as shown in table 1.
Embodiment 2
Add and mix according to the described component of table 1, all the other are identical with embodiment one.
Embodiment 3
Add and mix according to the described component of table 1, all the other are identical with embodiment one.
Embodiment 4
Add and mix according to the described component of table 1, all the other are identical with embodiment one.
Embodiment 5
Add and mix according to the described component of table 1, all the other are identical with embodiment one.
Embodiment 6
Add and mix according to the described component of table 1, all the other are identical with embodiment one.
Embodiment 7
Add and mix according to the described component of table 1, all the other are identical with embodiment one.
Embodiment 8
Add and mix according to the described component of table 1, all the other are identical with embodiment one.
Table 1 preparation gelling material mixture composition
Utilize the sludge curing agent of preparation that mud is cured, and measure the mud after solidifying, its evaluation of test result is as follows:
The normal concentration water requirement of 16 kinds of gelling material, steadiness and setting-up time result are presented at table 2.Reach a conclusion and passed through the steadiness test for implementing 1,2,4,5,6,7 and 8, the setting-up time of these samples records as follows.
Table 2 normal concentration water requirement, steadiness and setting-up time
The mortar of his-and-hers watches 3 listed preparation sludge solidification agent materials and the compressive strength data of paste sample.Its result shows, compressive strength increases during along with slaking and increases.The compressive strength of mortar sample reduces along with the increase of two semi-dry process flue gas desulphurization technology desulfurization slag (FGDS) content.In addition, these samples serious slight crack occurs in slaking after 3 days.28 days embodiment 1,2,4,5 in the table 4,6,7,8 intensity is greater than 25MPA.Remaining sample does not all have demonstration intensity in different periods, this is consistent with table TABLE 3 gelling material steadiness results.By composition relatively, conclusion is as follows: anhydrite and gypsum produce activation in any curing time to DA mortar sample standard deviation.Although it is not obvious that intensity increases phenomenon along with the increase of GBFS content.Select embodiment 1,2,4,5,6 prepare the paste sample.The rule of development of the compressive strength of paste sample is consistent with the mortar sample.The intensity of all paste samples meets the requirement greater than 32.5MPA.Table 3 shows that conclusion is: although along with the propelling of curing time increases, the hydration ratio of initial cure agent is because lower intensity is lower than OPCC paste sample.Initial stage can determine that embodiment 4 meets the requirement for preparing the gelling material that forms by activation slag and gypsum.In order to reduce cost, replace the listed activator of table table 3 to quicken hydro-combination process with slag and gypsum.
The compressive strength of table 3 mortar and paste sample
Sludge curing agent is carried out the hydration assessment, test shows, solidifying agent of the present invention is slow in the hydration initial reaction, its early strength is not high, this is owing to the activation of DA agent from sulphite and the vitriol of alkaline slag FGDS, the main component of FGDS is a sulphite, and the reaction between sulphite and the aluminate is slower than vitriol.
No lateral confinement compressive strength be sample under no lateral pressure condition, the ultimate strength of opposing axle pressure, demonstration be the solidifying agent additive and in the different ripening stages sample do not have contact between the lateral confinement compressive strength.In each project, no lateral confinement compressive strength is along with the time increases.The speed that increased in 28 days is higher than 60 days.But increases slowly after crossing the ripening stage.This mainly is because the hydration of stablizer finished to form simultaneously the viscosity of sample in preceding 28 days.But sample can absorb moisture from outside atmosphere, and therefore viscosity slightly increases after 60 days.And the compressive strength that is higher than other several solidifying agent.
California Bearing Ratio CBR value is widely used in designing ground and builds the road surface, and it is expressed as the local ability of carrying compressive strain of material of measuring, and in order to determine the CBR of local sandstone, is not having test roadbed sample under the gelling material of the interpolation condition naturally.CBR result is as shown in table 4, and the CBR value depends on gelling material content and water-content in the mixture, and WOPT is an optimum moisture content, and test result shows that the CBR value of unprocessed sandstone is lower than 3%.Behind sandstone interpolation 3% and 5% lime, the CBR value is improved as 33.9% and 39.2% (optimum moisture content), and the sandstone situation is from the inferior fine roadbed sandstone (CBR>8%) that are improved to as can be known.When 3% and 5% sludge curing agent added in the sandstone, the CBR value was improved to 56.3% and 95.5%; And learn through measuring and calculating, when the solidifying agent that adds embodiment 4 in undressed sandstone, the CBR value of solidifying after 7 days is 130kpa, the CBR value of solidifying after 28 days is 190kpa, the intensity of sandstone is enough to replace the more sandstone material of high-mechanic amount roadbed/ground, even than high-quality roadbed sandstone high-quality more.
Table 4CBR test result
In order to assess the spot effect of sludge curing agent, carried out four on-the-spot test, as shown in table 5.Test is carried out according to motorway highway engineering subgrade on-the-spot test method (JTJ059-95).The test cross section is 3800 meters long 6 meters wide scopes of Wuhan new city project.The sandstone of this engineering indication are through being categorized as the mud sandstone.The compressive strength in this cross section is more weak always and have sagging.The test foundation thickness is 50 centimetres, is divided into three layers and handles.The first layer (subsurface 50-35 centimetre) adds 9% embodiment two described solidifying agent, requires in 7 days compacted density and intensity to return to 80% and 0.3MPA respectively; The second layer (subsurface 35-18 centimetre) adds 7% embodiment two described solidifying agent, requires in 7 days compacted density and intensity to return to 90% and 1.5MPA respectively; Three layers in the embodiment two described solidifying agent to the of interpolation 5%, requirement returns to 95% compacted density.Therefore, Fig. 6 demonstrates maximum dry capacity, optimum water concentration, the modulus of resilience and the deviation at test interface.Reach a conclusion and reach the intensity and the solidness requirement of roadbed for the sandstone of sludge curing agent after stable fully.
Table 5 on-the-spot test
In addition, we have also done corresponding test to the curing agents of prior art for preparing.
Patent No. ZL200610083424.4 discloses a kind of sullage solidifying method, when the mud roadbed that adopts this sludge curing agent to carry out road performance is handled, directly the pulvis of admixture about 8% and about 0.1% liquor can make basic native intensity reach 2.1Mpa, are higher than the 0.08-0.25Mpa of domestic muck foundation load bearing requirements.
The disclosed solidify material of patent No. ZL03113373.8 comprises cement, flyash, gypsum, utilize this prescription in every cubic metre, to add the 90Kg solidify material, solidify that unconfined compression strength can reach 110kPa after 7 days, unconfined compression strength can reach 170kPa in 28 days, and the coefficient of permeability of curing sludge is less than 10 -5Cm/s.
The patent No. is 200810236713.2 to disclose a kind of sludge curing agent, comprises slag, cement clinker, lime, gypsum and exciting agent, places after 7-14 days, and its unconfined compression strength reaches the road surface effect.
Generally speaking, solidifying agent of the present invention is for to utilize multiple industrial solid wastes and promoting agent to prepare by ball mill, and the prior art of comparing improves a lot.As everyone knows, the mode of grinding can be improved the reactivity of slag particulate (GBFS) and electric furnace slag (EFSS).Pulverize the fineness that semi-dry process flue gas desulphurization technology desulfurization slag (FGDS) can strengthen particulate, increase total surface area and provide sulphite or vitriol.
Sludge curing agent of the present invention is gathered materials on the spot, and has reduced construction costs; Good seepage-proof property, solidified earth can be born certain pressure, has certain weather resistance, argillization does not take place through the water logging bubble, its main raw material(s) is inorganics, and is nontoxic, harmless, pollution-free, all is safe to animal and plant, has deodorant to taste simultaneously, the virus killing bacterium that disappears, multiple advantage such as purify water, it is with low cost, raw material supply is sufficient, production technique is simple and easy to do, can effectively solidify soil such as riverway sludge, sandy soil, mine tailing, can be widely used in banketing, engineering field such as fill.
The above embodiment is described preferred implementation of the present invention, but the present invention is confined to scope of embodiments.

Claims (9)

1. sludge curing agent, its component comprises:
Electric furnace slag (EFSS) 5-15%
Blast-furnace slag (OPCC) 5-15%
Mechanochemistry activation slag micropowder (GBFS) 20-45%
Semi-dry process flue gas desulphurization technology desulfurization slag (FGDS) 25-45%
Activator 4-16%.
2. according to the described sludge curing agent of claim 1, it is characterized in that: described activator is vitriol or sulphite activator.
3. according to the described sludge curing agent of claim 1, it is characterized in that: comprise also in the component that gypsum, described gypsum are plaster stone or dehydrated gyp-.
4. according to the described sludge curing agent of claim 2, it is characterized in that: described vitriol is sodium sulfate, sal epsom or Tai-Ace S 150.
5. according to the described sludge curing agent of claim 2, it is characterized in that: described sulphite is S-WAT, magnesium sulfite or aluminium sulfite.
6. according to the described sludge curing agent of claim 1, it is characterized in that: described slag is for refining the waste that ferrochrome, ferromanganese or ferrophosphorus produced.
7. the preparation method of a sludge curing agent, its step comprises: (1) mixes the back in process furnace dry 3-6 hour with component; (2) change in the shredder and mill, be provided with the back-mixing device in the described shredder, and utilize the back-mixing device with partly solidified dose send back to the feeding mouth place and with newly add component and mix.
8. the described sludge curing agent of claim 1 is as the application of the solidifying agent of building roadbase soil.
9. the described sludge curing agent of claim 1 is as the application that gushes in the river, lake, the water channel dredging sludge solidification that desilting produced prepares civil material.
CN 201010546292 2010-11-15 2010-11-15 Silt curing agent and preparation method thereof CN102060428A (en)

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103145354A (en) * 2013-02-26 2013-06-12 河南农业大学 Clinker-free compound-type tailing consolidating agent as well as preparation and application for same
CN103553466A (en) * 2013-10-29 2014-02-05 武汉钢铁(集团)公司 FGD (flue gas desulfurization) desulfurized fly ash solidifying agent and preparation method thereof
CN104030592A (en) * 2014-07-01 2014-09-10 把正春 Method for preparing environment-friendly activation mineral material addition exciting agent of ferrochrome slag
CN104446063A (en) * 2014-12-03 2015-03-25 北京中晶佳镁环境科技股份有限公司 Cement and manufacturing method thereof
CN104496235A (en) * 2014-12-15 2015-04-08 北京中晶佳镁环境科技股份有限公司 Magnesia cement and manufacturing method thereof
CN104630492A (en) * 2015-02-03 2015-05-20 北京交通大学 Method for solidifying/stabilizing heavy metals in electroplating sludge by using cement and industrial waste residues
CN105174829A (en) * 2015-06-29 2015-12-23 马鞍山金晟工业设计有限公司 Good thermal insulation effect silt curing agent for silt bricks
CN108609980A (en) * 2016-12-13 2018-10-02 秦皇岛轻粉科建环保科技有限公司 A method of lime-ash is discarded by silt soft foundation deep cure using desulphurization denitration
CN108793794A (en) * 2018-06-22 2018-11-13 深圳市颐泰中和科技有限公司 The method of red mud solidified cementitious compositions and preparation method thereof and in-situ solidifying red mud
CN110407528A (en) * 2018-04-27 2019-11-05 上海麦酷网络科技有限公司 A kind of mixing cured soil body road basement material of steel slag

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CN101342511A (en) * 2008-08-22 2009-01-14 中国铝业股份有限公司 Self-shifting material-returning apparatus of globe mill
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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103145354A (en) * 2013-02-26 2013-06-12 河南农业大学 Clinker-free compound-type tailing consolidating agent as well as preparation and application for same
CN103145354B (en) * 2013-02-26 2015-09-16 河南农业大学 Compound tailings solidifying agent of a kind of no first-hand datum and its preparation method and application
CN103553466A (en) * 2013-10-29 2014-02-05 武汉钢铁(集团)公司 FGD (flue gas desulfurization) desulfurized fly ash solidifying agent and preparation method thereof
CN103553466B (en) * 2013-10-29 2015-11-11 武汉钢铁(集团)公司 FGD desulphurize fly ash solidifying agent and preparation method thereof
CN104030592A (en) * 2014-07-01 2014-09-10 把正春 Method for preparing environment-friendly activation mineral material addition exciting agent of ferrochrome slag
CN104446063A (en) * 2014-12-03 2015-03-25 北京中晶佳镁环境科技股份有限公司 Cement and manufacturing method thereof
CN104496235A (en) * 2014-12-15 2015-04-08 北京中晶佳镁环境科技股份有限公司 Magnesia cement and manufacturing method thereof
CN104630492A (en) * 2015-02-03 2015-05-20 北京交通大学 Method for solidifying/stabilizing heavy metals in electroplating sludge by using cement and industrial waste residues
CN105174829A (en) * 2015-06-29 2015-12-23 马鞍山金晟工业设计有限公司 Good thermal insulation effect silt curing agent for silt bricks
CN108609980A (en) * 2016-12-13 2018-10-02 秦皇岛轻粉科建环保科技有限公司 A method of lime-ash is discarded by silt soft foundation deep cure using desulphurization denitration
CN110407528A (en) * 2018-04-27 2019-11-05 上海麦酷网络科技有限公司 A kind of mixing cured soil body road basement material of steel slag
CN108793794A (en) * 2018-06-22 2018-11-13 深圳市颐泰中和科技有限公司 The method of red mud solidified cementitious compositions and preparation method thereof and in-situ solidifying red mud

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Application publication date: 20110518