CN102408179A - Dewatered sludge solidifying agent - Google Patents
Dewatered sludge solidifying agent Download PDFInfo
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- CN102408179A CN102408179A CN2011102084690A CN201110208469A CN102408179A CN 102408179 A CN102408179 A CN 102408179A CN 2011102084690 A CN2011102084690 A CN 2011102084690A CN 201110208469 A CN201110208469 A CN 201110208469A CN 102408179 A CN102408179 A CN 102408179A
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- dewatered sludge
- solidifying agent
- silicate cement
- quality
- fine sand
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- Treatment Of Sludge (AREA)
Abstract
The invention relates to a dewatered sludge solidifying agent which comprises silicate cement, modified fly ash, fine sand and calcium sulfate, wherein the modified fly ash accounts for 5-7wt% of the silicate cement, the fine sand accounts for 1-3wt% of the silicate cement, and the calcium sulfate accounts for 0.6-1.4wt% of the silicate cement. The preparation method of the modified fly ash comprises: baking fly ash at the temperature of 280-320 DEG C for 40-70 minutes, taking out for cooling, sealing and storing for later use, wherein and the use amount of the dewatered sludge solidifying agent is 2-10wt% of dewatered sludge, and the water content of the dewatered sludge is 30-60%. The dewatered sludge solidifying agent is suitable for solidifying modification of sludge generated in a water conservancy project, civil engineering and wastewater treatment, and has short solidification time; and the obtained modified soil has the advantages of high strength, small void ratio and no secondary pollution.
Description
Technical field
The present invention relates to a kind of dewatered sludge is cured the solidifying agent of modification, belong to geotechnological field of materials.
Background technology
China region is wide, is mud resource big country in the world, and development mud reclaims, comprehensive utilization is well worth doing.According to relevant department's investigation statistics, the mud that only domestic lake, river course have, annual collection capacity can reach 7,000 ten thousand tons at least, adds the mud of municipal sewage system, and annual total collection capacity can be more than 10,000 tons.Gather mud, help river training, prevent water quality eutrophication and purifying city environment, and comprehensive utilization mud can be turned harm into good.
The lake desilting engineering from the domestic existing river adopts stockyard solidified mode mostly to the disposal of disembarkation mud.This method makes sludge dewatering and solidifying through in silt slurry, adding curing such as cement, lime and gelling material; This method has following distinct disadvantage when extensive desilting: at first; To export mud continuously during extensive desilting; With mixing cement, lime in all mud, quantities is too big consequently can't be accomplished in a short time; Secondly, gelling material such as a large amount of mud and cement, lime are can't fusion even, still can form serious secondary pollution during rain drop erosion; The 3rd, reach solidifying requirements, the cement that need mix, amount of lime are very big, and cost is high, and solidifies back waste total amount volume increase; At last, the biological fitness of so measuring big interpolation cement, lime treatment after fixing thing is destroyed, and generally can only do garbage loading embeading, the recycling difficulty.
Summary of the invention
The problems referred to above to prior art exists the invention provides a kind of solidifying agent, mix in the mud behind the mechanical dehydration, make its fast setting, thereby have the value of utilizing again.The present invention is applicable to that the mud to producing in hydro project, civil engineering work and the WWT is cured modification, and set time is short, high, little, the non-secondary pollution of voidage of resulting modification soil intensity.
Technical scheme of the present invention is following:
A kind of dewatered sludge solidifying agent comprises silicate cement, modified coal ash, fine sand, calcium sulfate; The quality of said modified coal ash is 5 ~ 7% of a silicate cement quality, and the quality of said fine sand is 1 ~ 3% of a silicate cement quality, and the quality of said calcium sulfate is 0.6 ~ 1.4% of a silicate cement quality; The preparation method of said modified coal ash is: flyash 280 ~ 320 ℃ of following roastings 40 ~ 70 minutes, is taken out cooling, and sealing is preserved subsequent use.
The usage quantity of said dewatered sludge solidifying agent is 2 ~ 10% of a dewatered sludge quality; The particle diameter of said fine sand is 0.63 ~ 1.25mm; The water cut of said dewatered sludge is 30 ~ 60%;
Beneficial technical effects of the present invention is:
1, used silicate cement in this dewatered sludge solidifying agent, its staple is tricalcium silicate 3CaOSiO
2, Dicalcium Phosphate (Feed Grade) 2CaOSiO
2, tricalcium aluminate 3CaOAl
2O
3, aluminic acid four calcium 4CaOAl
2O
3Fe
2O
3, the moisture generation hydration reaction in these compositions and the mud generates crystal and gel, will be harmful to the mud particulate and contain respectively, and progressively sclerosis forms solidified cement body.Its concrete reaction formula is:
2（3CaO·SiO
2）+6H
2O→3CaO·2SiO
2·3H
2O+3Ca(OH)
2
2（2CaO·SiO
2）+4H
2O→3CaO·2SiO
2·3H
2O+Ca(OH)
2
3CaO·Al
2O
3＋6H
2O→3CaO·Al
2O
3·6H
2O
4CaO·Al
2O
3·Fe
2O
3＋7H
2O→3CaO·Al
2O
3·6H
2O＋CaO·Fe
2O
3·H
2O
2, used fine sand in this dewatered sludge solidifying agent, fine sand has improved the grain grade proportion of dewatered sludge as aggregate, has reduced voidage, has further promoted the intensity of dewatered sludge, and has reduced the consumption of cement in the solidifying agent.
3, used modified coal ash in this dewatered sludge solidifying agent.Owing to be rich in activating oxide SiO in the flyash
2And Al
2O
3Be main vitreous particle, little metal oxide compound and unburnt carbon, its specific surface area is bigger, and surface energy is high, and to many pollution substances, especially heavy metal ion and organism have stronger adsorption.Through the thermal treatment activation modification to flyash, flyash can lose zeolite water and the crystal water in the duct, the quantity of its inner duct area and activated adsorption point is increased, and then improved the absorption property of flyash.Utilize these good performances, activating fly ash can reduce secondary pollution as sorbent material enriching heavy metal ion and organism again in the aggregate as dewatered sludge.
4, used calcium sulfate CaSO in this dewatered sludge solidifying agent
42H
2O, and contain tricalcium aluminate 3CaOAl in the cement
2O
3, both can react, and generate ettringite 3CaOAl
2O
33CaSO
432H
2O (wherein the quantity of crystal water is relevant with the humidity of environment of living in).Its concrete reaction formula is:
3CaO·Al
2O
3+6H
2O+3(CaSO
4·2H
2O)+19H
2O→3CaO·Al
2O
3·3CaSO
4·31H
2O
3CaO·Al
2O
3+3(CaSO
4·2H
2O)+26H
2O→3CaO·Al
2O
3·3CaSO
4·32H
2O
This reaction can improve the early strength of dewatered sludge when solidifying, and has accelerated the sclerosis of dewatered sludge, has effectively shortened the time that the modification soil that obtains after dewatered sludge is solidified reaches intensity.
5, the applied range of the disclosed dewatered sludge solidifying agent of the present invention; Has the tangible value of environmental protection than existing curing technology; The non-point source secondary pollution that the modification soil of effectively having avoided obtaining behind the sludge solidification causes environment, can be as roadbed filling with soil, backfill with soil etc.
Embodiment
Embodiment 1:
At first prepare the dewatered sludge solidifying agent: its component comprises silicate cement, modified coal ash, fine sand, calcium sulfate; Wherein the quality of modified coal ash is 7% of a silicate cement quality, and the quality of fine sand is 3% of a silicate cement quality, and particle diameter is 0.63 ~ 1.25mm, and the quality of calcium sulfate is 1.4% of a silicate cement quality; The preparation method of said modified coal ash is: flyash 280 ℃ of following roastings 70 minutes, will be sealed preservation before using.
The above-mentioned dewatered sludge solidifying agent for preparing is got 1kg, add in the dewatered sludge of 25kg, the mass percent that solidifying agent accounts for dewatered sludge is 4%, and the water cut of dewatered sludge is 40%.Mixture is stirred, be prepared into three groups of standard models, this model is cylindrical, diameter 3.9cm, height 8cm.This three group models maintenance at normal temperatures 7 days, 14 days, 28 days, in the unconfined compression strength that each time point is all tested this three group model respectively with no confining pressure appearance, concrete test data was seen table 1 respectively.Wherein unconfined compression strength is meant that the sample side do not limit when system, to sample apply along cylinder axis to pressure, added pressure when sample is destroyed.
Embodiment 2:
At first prepare the dewatered sludge solidifying agent: its component comprises silicate cement, modified coal ash, fine sand, calcium sulfate; Wherein the quality of modified coal ash is 5% of a silicate cement quality, and the quality of fine sand is 1% of a silicate cement quality, and particle diameter is 0.63 ~ 1.25mm, and the quality of calcium sulfate is 1% of a silicate cement quality; The preparation method of said modified coal ash is: flyash 320 ℃ of following roastings 45 minutes, will be sealed preservation before using.
The above-mentioned dewatered sludge solidifying agent for preparing is got 1kg, add in the dewatered sludge of 16.7kg, the mass percent that solidifying agent accounts for dewatered sludge is 6%, and the water cut of dewatered sludge is 50%.Mixture is stirred, be prepared into three groups of master dies, this model is cylindrical, diameter 3.9cm, height 8cm.This three group models maintenance at normal temperatures 7 days, 14 days, 28 days, in the unconfined compression strength that each time point is all tested this three group model respectively with no confining pressure appearance, concrete test data was seen table 1 respectively.Wherein unconfined compression strength is meant that the sample side do not limit when system, to sample apply along cylinder axis to pressure, added pressure when sample is destroyed.
Embodiment 1 and 2 concrete test data are seen table 1.
Table 1
Data from table 1 can calculate the average unconfined compression strength of three group models in embodiment 1 and 2, and its concrete data are seen shown in the table 2.
Table 2
Can find out that from table 1, table 2 along with the increase of curing time, the unconfined compression strength of model significantly improves.
More than describing is to explanation of the present invention, is not to qualification of the present invention, and under the situation of invention spirit, the present invention can do any type of modification, as is equal to replacement, improvement etc.
Claims (4)
1. a dewatered sludge solidifying agent is characterized in that: comprise silicate cement, modified coal ash, fine sand, calcium sulfate;
The quality of said modified coal ash is 5 ~ 7% of a silicate cement quality, and the quality of said fine sand is 1 ~ 3% of a silicate cement quality, and the quality of said calcium sulfate is 0.6 ~ 1.4% of a silicate cement quality;
The preparation method of said modified coal ash is: flyash 280 ~ 320 ℃ of following roastings 40 ~ 70 minutes, is taken out cooling, and sealing is preserved subsequent use.
2. a kind of dewatered sludge solidifying agent according to claim 1 is characterized in that: the usage quantity of said dewatered sludge solidifying agent is 2 ~ 10% of a dewatered sludge quality.
3. a kind of dewatered sludge solidifying agent according to claim 1 is characterized in that: the particle diameter of said fine sand is 0.63 ~ 1.25mm.
4. a kind of dewatered sludge solidifying agent according to claim 1 is characterized in that: the water cut of said dewatered sludge is 30 ~ 60%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102084690A CN102408179A (en) | 2011-07-25 | 2011-07-25 | Dewatered sludge solidifying agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011102084690A CN102408179A (en) | 2011-07-25 | 2011-07-25 | Dewatered sludge solidifying agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102408179A true CN102408179A (en) | 2012-04-11 |
Family
ID=45910579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011102084690A Pending CN102408179A (en) | 2011-07-25 | 2011-07-25 | Dewatered sludge solidifying agent |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102408179A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106517951A (en) * | 2016-11-11 | 2017-03-22 | 江苏东方生态清淤工程有限公司 | Baking-free bricks prepared through heavy-metal-polluted bottom mud |
| CN108409103A (en) * | 2018-04-17 | 2018-08-17 | 曹恩惠 | A kind of municipal sewage sludge and the deeply dehydrating sludge agent of trade effluent factory |
| CN109574122A (en) * | 2018-12-29 | 2019-04-05 | 中南林业科技大学 | The method of removal dyestuff is cooperateed with persulfate using flyash |
| CN110981126A (en) * | 2019-11-28 | 2020-04-10 | 陈红元 | Waste ash curing agent, preparation method and application thereof in sludge curing |
Citations (4)
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|---|---|---|---|---|
| US4615809A (en) * | 1983-06-16 | 1986-10-07 | Velsicol Chemical Corporation | Method for stabilization of sludge |
| CN1944324A (en) * | 2006-10-19 | 2007-04-11 | 上海大学 | Method for treating city ditch mud |
| CN101172749A (en) * | 2007-10-12 | 2008-05-07 | 河海大学 | Solidifying agent for solidifying and stabilizing treatment of generated dewatered sludge in sewage plant |
| CN101602567A (en) * | 2009-07-16 | 2009-12-16 | 王军 | Waste mud solidification processing method based on polypropylene acetamide |
-
2011
- 2011-07-25 CN CN2011102084690A patent/CN102408179A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4615809A (en) * | 1983-06-16 | 1986-10-07 | Velsicol Chemical Corporation | Method for stabilization of sludge |
| CN1944324A (en) * | 2006-10-19 | 2007-04-11 | 上海大学 | Method for treating city ditch mud |
| CN101172749A (en) * | 2007-10-12 | 2008-05-07 | 河海大学 | Solidifying agent for solidifying and stabilizing treatment of generated dewatered sludge in sewage plant |
| CN101602567A (en) * | 2009-07-16 | 2009-12-16 | 王军 | Waste mud solidification processing method based on polypropylene acetamide |
Non-Patent Citations (1)
| Title |
|---|
| 付静: "粉煤灰改性及其在水处理中的应用", 《中国环境管理》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106517951A (en) * | 2016-11-11 | 2017-03-22 | 江苏东方生态清淤工程有限公司 | Baking-free bricks prepared through heavy-metal-polluted bottom mud |
| CN106517951B (en) * | 2016-11-11 | 2019-02-15 | 江苏东方生态清淤工程有限公司 | It is a kind of to utilize the non-burning brick of heavy metal polluted bed mud preparation |
| CN108409103A (en) * | 2018-04-17 | 2018-08-17 | 曹恩惠 | A kind of municipal sewage sludge and the deeply dehydrating sludge agent of trade effluent factory |
| CN109574122A (en) * | 2018-12-29 | 2019-04-05 | 中南林业科技大学 | The method of removal dyestuff is cooperateed with persulfate using flyash |
| CN110981126A (en) * | 2019-11-28 | 2020-04-10 | 陈红元 | Waste ash curing agent, preparation method and application thereof in sludge curing |
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Application publication date: 20120411 |