CN114349467A - Sludge curing agent using magnesia cement and preparation method thereof - Google Patents
Sludge curing agent using magnesia cement and preparation method thereof Download PDFInfo
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- CN114349467A CN114349467A CN202210043576.0A CN202210043576A CN114349467A CN 114349467 A CN114349467 A CN 114349467A CN 202210043576 A CN202210043576 A CN 202210043576A CN 114349467 A CN114349467 A CN 114349467A
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- 239000010802 sludge Substances 0.000 title claims abstract description 80
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 72
- 239000004568 cement Substances 0.000 title claims abstract description 53
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 48
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 36
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- 239000010881 fly ash Substances 0.000 claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000002893 slag Substances 0.000 claims abstract description 27
- 239000000843 powder Substances 0.000 claims abstract description 22
- 238000002156 mixing Methods 0.000 claims abstract description 12
- 239000000203 mixture Substances 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000001723 curing Methods 0.000 claims description 61
- 238000000034 method Methods 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 16
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 12
- 239000011777 magnesium Substances 0.000 claims description 7
- 229910052749 magnesium Inorganic materials 0.000 claims description 7
- 229940091250 magnesium supplement Drugs 0.000 claims description 7
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 239000011575 calcium Substances 0.000 claims description 5
- 239000003990 capacitor Substances 0.000 claims description 5
- 238000000227 grinding Methods 0.000 claims description 5
- 229940050906 magnesium chloride hexahydrate Drugs 0.000 claims description 5
- DHRRIBDTHFBPNG-UHFFFAOYSA-L magnesium dichloride hexahydrate Chemical compound O.O.O.O.O.O.[Mg+2].[Cl-].[Cl-] DHRRIBDTHFBPNG-UHFFFAOYSA-L 0.000 claims description 5
- 230000008901 benefit Effects 0.000 abstract description 6
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 238000007873 sieving Methods 0.000 abstract 1
- 239000002689 soil Substances 0.000 description 28
- 239000000463 material Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 12
- 238000011049 filling Methods 0.000 description 11
- 230000006835 compression Effects 0.000 description 7
- 238000007906 compression Methods 0.000 description 7
- 238000010835 comparative analysis Methods 0.000 description 6
- 239000013078 crystal Substances 0.000 description 6
- 239000007788 liquid Substances 0.000 description 6
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- IQYKECCCHDLEPX-UHFFFAOYSA-N chloro hypochlorite;magnesium Chemical compound [Mg].ClOCl IQYKECCCHDLEPX-UHFFFAOYSA-N 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 4
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 4
- 239000000920 calcium hydroxide Substances 0.000 description 4
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000006872 improvement Effects 0.000 description 3
- GVALZJMUIHGIMD-UHFFFAOYSA-H magnesium phosphate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O GVALZJMUIHGIMD-UHFFFAOYSA-H 0.000 description 3
- 239000004137 magnesium phosphate Substances 0.000 description 3
- 229910000157 magnesium phosphate Inorganic materials 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 2
- 239000002734 clay mineral Substances 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 239000004567 concrete Substances 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000001879 gelation Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 229910001425 magnesium ion Inorganic materials 0.000 description 2
- 229960002261 magnesium phosphate Drugs 0.000 description 2
- 235000010994 magnesium phosphates Nutrition 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000007836 KH2PO4 Substances 0.000 description 1
- NQIMBTTWSMRETR-UHFFFAOYSA-M P(=O)([O-])(O)O.[K+].[O-2].[Mg+2] Chemical compound P(=O)([O-])(O)O.[K+].[O-2].[Mg+2] NQIMBTTWSMRETR-UHFFFAOYSA-M 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910001860 alkaline earth metal hydroxide Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 239000002585 base Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 210000000887 face Anatomy 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000010335 hydrothermal treatment Methods 0.000 description 1
- -1 hydroxide ions Chemical class 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000005067 remediation Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000013112 stability test Methods 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 210000004127 vitreous body Anatomy 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
Abstract
The invention discloses a sludge curing agent utilizing magnesia cement and a preparation method thereof, wherein the sludge curing agent is prepared from the following raw materials in parts by weight: 30 parts of magnesia cement, 10-30 parts of fly ash and 10-30 parts of slag powder. Fully and uniformly mixing the magnesia cement, the fly ash and the slag powder, and sieving the mixture by a 200-mesh sieve to obtain a finished curing agent product. The silt curing agent can effectively improve the silt strength and the water stability, reduce the compressibility of the silt, and has the advantages of simple preparation process, low cost and environmental protection.
Description
Technical Field
The invention relates to the technical field of sludge treatment, in particular to a sludge curing agent utilizing magnesia cement and a preparation method thereof.
Background
In the 21 st century, water conservancy in China faces three problems of aggravation of flood disasters, shortage of water resources and deterioration of water ecological environment, and unsmooth flood transportation and water quality deterioration caused by serious sediment accumulation in rivers, seas, lakes and reservoirs are one of the important reasons for the three problems. Dredging the river, sea and lake reservoir, controlling and optimizing the environmental quality around the river, sea and lake reservoir, and is an important measure for promoting the sustainable development of national economy, particularly improving the passive situation of the current water conservancy industry and improving the living quality of people around the river, sea and lake reservoir. At present, the comprehensive remediation work of the water environment of the dredging river, sea and lake reservoir in all parts of the country, particularly in economically developed areas, is being developed in a compact and compact manner. The dredging process generates more and more sludge. In order to avoid secondary pollution and change the sludge into valuable, the produced sludge must be treated reasonably, resourcefully, harmlessly and economically. The sludge has the engineering characteristics of low strength, high compressibility, poor water permeability, low load capacity, slow strength increase, easy and uneven deformation after loading, high deformation rate and long stability, and is mainly discarded by throwing and filling for a long time.
At present, the domestic resource utilization methods of the sludge comprise the following four methods: (1) a hydraulic reclamation method; (2) a physical dehydration method; (3) a heat treatment method. Converting clay minerals in the sludge into building materials by a heating and sintering method; (4) and (3) a curing treatment method.
In the resource treatment and utilization of dredged sludge, the solidification treatment technology is generally favored and applied in large quantities at home and abroad due to the advantages of simple process, high efficiency, sludge pollution reduction, capability of taking solidified soil as a filling resource and the like, and the U.S. national Environmental Protection Agency (EPA) considers solidification as the best technology for treating 57 kinds of harmful wastes. The solidification treatment is a method for improving or improving the engineering property of the sludge by adding a solidification material into the sludge and carrying out a series of physical and chemical reactions on water, clay minerals and the solidification material in the sludge. The treatment method can treat a large amount of sludge generated by dredging, solves the difficulty of soil shortage in partial areas for engineering, and has the advantages of large treatment capacity and short treatment time. The curing treatment method adopting the chemical principle is also a method which is more flexible and has wider application range. The dredged sludge is solidified, so that the waste sludge with high water content and low strength can be converted into engineering soil with high strength and low permeability.
The application of the cement curing method in the sludge curing treatment technology is the most extensive, and the hydration reaction generated by curing the sludge by adopting the cement as a curing material is similar to the process of curing wastes such as soft soil, sludge and the like by using a cement matrix material. At present, the novel compound is MgO-KH2PO4Magnesium phosphate cement containing magnesium oxide-potassium dihydrogen phosphate as main component and MgO-MgCl as main componentThe separated magnesium oxychloride cement has the advantages of low production cost, low energy consumption and CO2Low discharge amount, strong environmental adaptability and the like, and is a green and environment-friendly cementing material.
Currently, the influence of ordinary portland cement on sludge solidification treatment technology is mainly studied in the industry, the research on cementing materials such as magnesium phosphate/magnesium oxychloride cement (hereinafter collectively referred to as "magnesia cement") is still in the beginning stage, and the research on forming a composite cementing material (hereinafter referred to as "magnesia cement-based multiphase cementing material") by taking magnesia cement as a base and fully utilizing industrial byproducts such as fly ash/slag as auxiliary materials and solidifying high-water-content sludge and using the high-water-content sludge as embankment filler is rare. The interaction between the specific components of the sludge and the curing material is very complex, so that the theoretical explanation on the performance evaluation, the hydration reaction process and the microstructure evolution mechanism of the cured sludge is not determined to date. Especially, the research on the mechanical property of the solidified sludge formed by adding magnesium phosphate cement or magnesium oxychloride cement, the modification effect of fly ash/slag and the micro mechanism thereof is still in the initial stage, and needs to be deeply explored.
China ' urban road engineering construction and quality acceptance Standard ' CJJ1-2008 ' and ' Highway subgrade construction technical Specification ' JTG F10-2006 specify: "soil with liquid limit greater than 50% cannot be used directly as roadbed filling".
Road subgrade design Specification JTG D30-2004 states that: the compressibility of high-liquid soil is poor, the compressibility of compacted soil is still large, the compression deformation of a roadbed is large, and the deformation stabilization time is long. Thus, the specification states that use should be limited in conjunction with the specific case: compression factor a1-2<0.1MPa-1The low-compressibility soil of (2) can be used for embankment filling of 15m or less, 0.1<a1-2<0.5MPa-1The medium-compressive soil of (1) can be used for embankments of less than 6m, a1-2>0.5MPa-1The high-compressibility soil of (2) cannot be used directly.
Regulation of urban road engineering construction and quality acceptance regulation CJJ 1-2008: "in urban expressways and main roads, the strength (CBR) and compactness of filling materials should satisfy: the minimum value of CBR of the upper bed (0-30 cm) is 8%, and the compactness is more than or equal to 95%; the minimum value of CBR of the lower bed (30-80 cm) is 5%, and the compactness is more than or equal to 93%; the minimum value of CBR of an upper embankment (80-150 cm) is 4%, and the compactness is more than or equal to 92%; the minimum value of CBR of the lower embankment (more than 150cm) is 3 percent, and the compactness is more than or equal to 90 percent.
The regulations provide a judgment basis for judging whether the Donghu sludge solidified soil can be directly used for embankment filling or whether the Donghu sludge solidified soil meets the standard regulations after modification, namely if the Donghu sludge solidified soil cannot be directly used for embankment filling and needs modification treatment, the liquid limit, the CBR, the compression coefficient and the water stability after modification are main control indexes for determining the mixing amount of the modifier and the curing age.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a sludge curing agent utilizing magnesia cement and a preparation method thereof, wherein the sludge curing agent can improve the bearing capacity and the water stability of sludge soil, reduce the compressibility of the soil, enable the sludge to reach the condition of being used as roadbed filler after being modified, and realize resource utilization.
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
in a first aspect, the present invention provides a sludge curing agent using magnesia cement, characterized in that: the sludge curing agent is prepared from the following raw materials in parts by weight: 30 parts of magnesia cement, 10-30 parts of fly ash and 10-30 parts of slag powder.
Preferably, the fly ash contains more than 10% of CaO and is high-calcium fly ash.
Further, the slag powder is granulated blast furnace slag powder with the quality of s95 grade.
In a second aspect, the present invention provides a method for preparing a sludge curing agent using magnesium cement as described above, comprising: the preparation method of the magnesia cement comprises the following steps: mixing capacitor magnesium powder and magnesium chloride hexahydrate according to the mass ratio of 2: 1, adding a small amount of water, stirring, and uniformly stirring to obtain the magnesia cement.
Preferably, the preparation method of the sludge curing agent comprises the following steps: uniformly mixing the magnesia cement, the fly ash and the slag powder, fully stirring and grinding the mixture, and passing the mixture through a 200-mesh sieve to obtain a finished curing agent.
Furthermore, after the sludge curing agent is mixed into the sludge, the curing can be completed after 28 days of maintenance.
The working principle of the invention is as follows:
the fly ash is an artificial pozzolanic mixed material which has little or no hydraulic gelation property, but can react with calcium hydroxide or other alkaline earth metal hydroxides at normal temperature, particularly under hydrothermal treatment conditions, in the presence of powdery water to generate a compound with hydraulic gelation property, so that the fly ash becomes a material with increased strength and durability. Meanwhile, the fly ash is an efficient auxiliary material, the magnesium oxychloride cement is quickly hydrated in the early stage, a large amount of needle-shaped 5-phase and 3-phase crystals are formed under extremely high supersaturation degree, and the criss-cross needle-shaped crystals enable the product to have extremely high breaking strength and high porosity. Once meeting water, the water permeates into the test body, the 5-phase and 3-phase are dissolved, broken and lost, and the strength is greatly reduced. When the fly ash with smooth particles is added and filled in the middle of the needle-shaped crystal, the fly ash and the needle-shaped crystal are mutually filled, so that the product structure is greatly improved, and the carbon in the fly ash has hydrophobicity, more importantly, the active SiO in the fly ash2Can react with Mg2+Forming MgHPO with stronger water resistance4·3H2And O, the interpenetration and adhesion among crystals are enhanced.
The chemical main component of the slag is SiO2、CaO、Al2O3And MgO, wherein the slag is mainly of an amorphous vitreous body structure, contains a small amount of crystalline phase minerals, has activity superior to that of the fly ash, is an important admixture for concrete and cement, and can reduce the cost of the concrete. In an alkaline environment, calcium ions and magnesium ions on the surface of slag glass body generate calcium hydroxide and magnesium hydroxide under the action of hydroxide ions in a hydration process, the generated strong alkali destroys the surface of the glass body, in addition, the calcium hydroxide reacts with silicon dioxide to generate a C-S-H gel substance, and the dissolution of calcium hydroxide crystals along with the hydration reaction and the deposition of the C-S-H gel cause the hardening and the strength improvement of the whole system.
The invention has the following advantages:
the sludge curing agent provided by the invention is mainly magnesium cement, and the magnesium oxychloride cement can effectively improve the sludge strength, has good heavy metal adsorption capacity, has excellent performances of high strength, wear resistance, salt and halogen corrosion resistance, simple production process, weak alkalinity and the like, and can enable the modified sludge soil to meet the requirement of embankment filling.
The silt curing agent can effectively improve the silt strength and the water stability, reduce the compressibility of the silt, and has the advantages of simple preparation process, mild conditions, low cost and environmental protection.
Drawings
FIG. 1 is a graph showing comparative analysis of the effect of water stability of clay added with the sludge curing agent of the present invention for 0 hour.
FIG. 2 is a graph showing comparative analysis of the effect of water stability of the sludge added with the sludge curing agent of the present invention for 0.5 hour.
FIG. 3 is a graph showing comparative analysis of the effect of water stability of 1.5 hours after adding the sludge curing agent of the present invention to the sludge.
FIG. 4 is a graph showing comparative analysis of the effect of water stability of sludge added with the sludge curing agent of the present invention for 3.5 hours.
FIG. 5 is a graph showing comparative analysis of the effect of water stability of the sludge added with the sludge curing agent of the present invention for 6.5 hours.
FIG. 6 is a graph showing comparative analysis of the effect of 24-hour water stability of sludge added with the sludge curing agent of the present invention.
Detailed Description
The technical solution of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
Example 1
A sludge curing agent utilizing magnesia cement is prepared from the following raw materials in parts by weight: 30 parts of magnesia cement, 10 parts of fly ash and 30 parts of slag powder.
The fly ash is high-calcium fly ash, and the CaO content is more than 10 percent.
The slag powder is granulated blast furnace slag powder with the quality of s95 grade.
The preparation method of the magnesia cement comprises the following steps: mixing capacitor magnesium powder and magnesium chloride hexahydrate according to the mass ratio of 2: 1, adding a small amount of water, stirring, and uniformly stirring to obtain the magnesia cement.
The preparation method of the sludge curing agent comprises the following steps: uniformly mixing the magnesia cement, the fly ash and the slag powder, fully stirring and grinding the mixture, and passing the mixture through a 200-mesh sieve to obtain a finished curing agent.
After the sludge curing agent is mixed into the sludge, the curing can be completed by maintaining for 28 days.
Example 2
A sludge curing agent utilizing magnesia cement is prepared from the following raw materials in parts by weight: 30 parts of magnesia cement, 20 parts of fly ash and 20 parts of slag powder.
The fly ash contains more than 10 percent of CaO and is high-calcium fly ash.
The slag powder is granulated blast furnace slag powder with the quality of s95 grade.
The preparation method of the magnesia cement comprises the following steps: mixing capacitor magnesium powder and magnesium chloride hexahydrate according to the mass ratio of 2: 1, adding a small amount of water, stirring, and uniformly stirring to obtain the magnesia cement.
The preparation method of the sludge curing agent comprises the following steps: uniformly mixing the magnesia cement, the fly ash and the slag powder, fully stirring and grinding the mixture, and passing the mixture through a 200-mesh sieve to obtain a finished curing agent.
After the sludge curing agent is mixed into the sludge, the curing can be completed by maintaining for 28 days.
Example 3
A sludge curing agent utilizing magnesia cement is prepared from the following raw materials in parts by weight: 30 parts of magnesia cement, 30 parts of fly ash and 10 parts of slag powder.
The fly ash contains more than 10 percent of CaO and is high-calcium fly ash.
The slag powder is granulated blast furnace slag powder with the quality of s95 grade.
The preparation method of the magnesia cement comprises the following steps: mixing capacitor magnesium powder and magnesium chloride hexahydrate according to the mass ratio of 2: 1, adding a small amount of water, stirring, and uniformly stirring to obtain the magnesia cement.
The preparation method of the sludge curing agent comprises the following steps: uniformly mixing the magnesia cement, the fly ash and the slag powder, fully stirring and grinding the mixture, and passing the mixture through a 200-mesh sieve to obtain a finished curing agent.
After the sludge curing agent is mixed into the sludge, the curing can be completed by maintaining for 28 days.
The invention has the following beneficial effects:
in order to verify the use effect of the sludge curing agent, the sludge curing agent finished products obtained in the three embodiments are used for performance test, and the test results are as follows:
the method comprises the following steps of (1) curing the muddy soil at the bottom of the east lake of Wuhan, firstly testing the performance of the muddy soil before curing, then doping the muddy soil curing agent of the invention according to 7% of the weight of the muddy soil, uniformly stirring, and measuring the liquid limit, the strength, the compression coefficient and the water stability of the muddy soil after curing and curing the muddy soil for 28 days, wherein the results are as follows:
liquid plastic limit test results:
| liquid limit | Plastic limit | Index of plasticity | |
| Uncured silt soil | 34 | 12 | 22 |
| Example one | 34 | 18 | 16 |
| Example two | 33 | 15 | 18 |
| EXAMPLE III | 34 | 18 | 16 |
The three embodiments after the silt soil is solidified all meet the strength index of the roadbed filling
CBR (california loading ratio) test results:
| 90% compactibility | 93% compactness | |
| Uncured silt soil | 4.01 | 6.23 |
| Example one | 16.59 | 21.43 |
| Example two | 25.89 | 26.49 |
| ExamplesIII | 18.46 | 21.87 |
The strength improvement effect of the embodiment 2 after the silt soil is solidified is most obvious, and the strength index of the roadbed filling is met.
Compression test (compression index a)1-2) As a result:
the uncured silt compression factor was 0.62.
| 3d | 7d | 14d | 28d | |
| Example one | 0.102 | 0.0832 | 0.080 | 0.0655 |
| Example two | 0.101 | 0.120 | 0.088 | 0.0439 |
| EXAMPLE III | 0.083 | 0.066 | 0.099 | 0.064 |
The compression coefficient reduction effect of the embodiment 2 after the silt soil is solidified is most obvious, and the roadbed filling strength index is met.
Water stability test results:
the water stability improvement effect of example 2 after the mud soil is solidified is most obvious, and the details are shown in figures 1-6.
Claims (6)
1. A sludge curing agent using magnesia cement is characterized in that: the sludge curing agent is prepared from the following raw materials in parts by weight: 30 parts of magnesia cement, 10-30 parts of fly ash and 10-30 parts of slag powder.
2. The sludge curing agent using magnesium cement according to claim 1, wherein: the fly ash contains more than 10% of CaO and is high-calcium fly ash.
3. The sludge curing agent using magnesium cement according to claim 2, wherein: the slag powder is granulated blast furnace slag powder.
4. A method for preparing the sludge curing agent using magnesium cement according to any one of claims 1 to 3, wherein: the preparation method of the magnesia cement comprises the following steps: mixing capacitor magnesium powder and magnesium chloride hexahydrate according to the mass ratio of 2: 1, adding a small amount of water, stirring, and uniformly stirring to obtain the magnesia cement.
5. The method for preparing a sludge curing agent using magnesium cement according to claim 4, wherein: the preparation method of the sludge curing agent comprises the following steps: uniformly mixing the magnesia cement, the fly ash and the slag powder, fully stirring and grinding the mixture, and passing the mixture through a 200-mesh sieve to obtain a finished curing agent.
6. The method for preparing a sludge curing agent using magnesium cement according to claim 5, wherein: after the sludge curing agent is mixed into the sludge, the curing can be completed by maintaining for 28 days.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117303842A (en) * | 2023-08-15 | 2023-12-29 | 南京交通职业技术学院 | Brick making formula, technology and application based on dredging sludge |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108675751A (en) * | 2018-05-25 | 2018-10-19 | 武汉大学 | A kind of environment-friendly type mud composite curing agent |
| CN113666588A (en) * | 2021-07-26 | 2021-11-19 | 江苏省科佳工程设计有限公司 | Method for curing high-water-content slurry |
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2022
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| CN108675751A (en) * | 2018-05-25 | 2018-10-19 | 武汉大学 | A kind of environment-friendly type mud composite curing agent |
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| CN117303842A (en) * | 2023-08-15 | 2023-12-29 | 南京交通职业技术学院 | Brick making formula, technology and application based on dredging sludge |
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