CN112374711A - Sludge curing agent based on industrial waste residues and application method thereof - Google Patents
Sludge curing agent based on industrial waste residues and application method thereof Download PDFInfo
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- 239000010802 sludge Substances 0.000 title claims abstract description 80
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000002440 industrial waste Substances 0.000 title claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 15
- 239000010865 sewage Substances 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims description 44
- 239000002893 slag Substances 0.000 claims description 32
- 239000000203 mixture Substances 0.000 claims description 27
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical group [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 239000000843 powder Substances 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 19
- 239000010881 fly ash Substances 0.000 claims description 19
- 239000010959 steel Substances 0.000 claims description 19
- 239000012190 activator Substances 0.000 claims description 15
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 claims description 12
- 229910052748 manganese Inorganic materials 0.000 claims description 12
- 239000011572 manganese Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 238000005303 weighing Methods 0.000 claims description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 11
- 235000010755 mineral Nutrition 0.000 claims description 11
- 239000011707 mineral Substances 0.000 claims description 11
- 238000002156 mixing Methods 0.000 claims description 11
- 238000000498 ball milling Methods 0.000 claims description 10
- 238000003825 pressing Methods 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052602 gypsum Inorganic materials 0.000 claims description 8
- 239000010440 gypsum Substances 0.000 claims description 8
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 7
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 238000007596 consolidation process Methods 0.000 claims description 7
- 229910052593 corundum Inorganic materials 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 7
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 6
- 229910052681 coesite Inorganic materials 0.000 claims description 5
- 229910052906 cristobalite Inorganic materials 0.000 claims description 5
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 229910052682 stishovite Inorganic materials 0.000 claims description 5
- 229910052905 tridymite Inorganic materials 0.000 claims description 5
- 239000000292 calcium oxide Substances 0.000 claims description 4
- 150000004683 dihydrates Chemical class 0.000 claims description 4
- CSNNHWWHGAXBCP-UHFFFAOYSA-L magnesium sulphate Substances [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 claims description 4
- 229910052604 silicate mineral Inorganic materials 0.000 claims description 4
- 229910052943 magnesium sulfate Inorganic materials 0.000 claims description 3
- 239000002245 particle Substances 0.000 claims description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 3
- 239000007832 Na2SO4 Substances 0.000 claims description 2
- 229910003243 Na2SiO3·9H2O Inorganic materials 0.000 claims description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 2
- 150000004645 aluminates Chemical class 0.000 claims description 2
- BFNBIHQBYMNNAN-UHFFFAOYSA-N ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052921 ammonium sulfate Inorganic materials 0.000 claims description 2
- 235000011130 ammonium sulphate Nutrition 0.000 claims description 2
- 229910001919 chlorite Inorganic materials 0.000 claims description 2
- 229910052619 chlorite group Inorganic materials 0.000 claims description 2
- QBWCMBCROVPCKQ-UHFFFAOYSA-N chlorous acid Chemical compound OCl=O QBWCMBCROVPCKQ-UHFFFAOYSA-N 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- -1 iron aluminate Chemical class 0.000 claims description 2
- 229940099596 manganese sulfate Drugs 0.000 claims description 2
- 239000011702 manganese sulphate Substances 0.000 claims description 2
- 235000007079 manganese sulphate Nutrition 0.000 claims description 2
- SQQMAOCOWKFBNP-UHFFFAOYSA-L manganese(II) sulfate Chemical compound [Mn+2].[O-]S([O-])(=O)=O SQQMAOCOWKFBNP-UHFFFAOYSA-L 0.000 claims description 2
- 239000010453 quartz Substances 0.000 claims description 2
- AJPJDKMHJJGVTQ-UHFFFAOYSA-M sodium dihydrogen phosphate Chemical compound [Na+].OP(O)([O-])=O AJPJDKMHJJGVTQ-UHFFFAOYSA-M 0.000 claims description 2
- 229910000162 sodium phosphate Inorganic materials 0.000 claims description 2
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 2
- 238000000227 grinding Methods 0.000 claims 1
- 238000002386 leaching Methods 0.000 abstract description 34
- 229910001385 heavy metal Inorganic materials 0.000 abstract description 13
- 239000002910 solid waste Substances 0.000 abstract description 9
- 230000006641 stabilisation Effects 0.000 abstract description 5
- 238000011105 stabilization Methods 0.000 abstract description 5
- 230000018044 dehydration Effects 0.000 abstract description 3
- 238000006297 dehydration reaction Methods 0.000 abstract description 3
- 150000002500 ions Chemical class 0.000 abstract description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 26
- 239000004568 cement Substances 0.000 description 13
- 239000011133 lead Substances 0.000 description 10
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 9
- 238000006243 chemical reaction Methods 0.000 description 9
- 229910052759 nickel Inorganic materials 0.000 description 9
- 229910052725 zinc Inorganic materials 0.000 description 9
- 239000011701 zinc Substances 0.000 description 9
- PTFCDOFLOPIGGS-UHFFFAOYSA-N Zinc dication Chemical compound [Zn+2] PTFCDOFLOPIGGS-UHFFFAOYSA-N 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 238000006703 hydration reaction Methods 0.000 description 8
- RVPVRDXYQKGNMQ-UHFFFAOYSA-N lead(2+) Chemical compound [Pb+2] RVPVRDXYQKGNMQ-UHFFFAOYSA-N 0.000 description 8
- 238000000465 moulding Methods 0.000 description 8
- 229910001453 nickel ion Inorganic materials 0.000 description 8
- 239000011575 calcium Substances 0.000 description 6
- 239000002689 soil Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 239000002956 ash Substances 0.000 description 5
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 239000000378 calcium silicate Substances 0.000 description 4
- 229910052918 calcium silicate Inorganic materials 0.000 description 4
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 4
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- 241001408449 Asca Species 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 239000011149 active material Substances 0.000 description 1
- 239000013543 active substance Substances 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 244000052616 bacterial pathogen Species 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 235000019341 magnesium sulphate Nutrition 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 244000052769 pathogen Species 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Sludge (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a sludge curing agent based on industrial waste residues and an application method thereof. The curing agent is used for sludge treatment in urban sewage plants, can realize rapid dehydration of sludge and efficient curing/stabilization of heavy metal in sludge at normal temperature, and greatly reduces the leaching concentration of heavy metal ions in a solidified body. In addition, the main raw materials of the curing agent are bulk industrial solid wastes, so that the solid wastes can be largely consumed, the resource utilization of the solid wastes is realized, and the pollution of the solid wastes to the environment is reduced.
Description
Technical Field
The invention belongs to the technical field of environmental protection, relates to a resource utilization method of industrial solid waste, and particularly relates to a sludge curing agent based on industrial waste residues and an application method thereof.
Background
With the rapid development of urbanization in China, the sludge yield of a municipal sewage treatment plant is increased dramatically. According to statistical data of Chinese sludge treatment deep investigation and investment strategy planning analysis report, the yield of the sludge in China is estimated to exceed 7000 million tons in 2020 and break through 8000 million tons in 2021. The water content of the sludge is very high, and the sludge also contains a large amount of toxic and harmful substances such as heavy metals, microorganisms, pathogens and the like, so that the sludge can cause great pollution to soil and underground water if not treated properly.
At present, the treatment method of sludge in China mainly comprises sanitary landfill, agricultural utilization, incineration treatment and the like. The sludge landfill needs to occupy a large amount of land, and only prevents pollutants in the sludge from diffusing into the environment, but still causes pollution to the soil and underground water; in the agricultural utilization of the sludge, the sludge needs to be subjected to harmless treatment before utilization, so that the pollution of harmful substances such as heavy metals, pathogenic bacteria and the like in the sludge to farmland soil and the harm to crops are prevented, and the cost is high; although the incineration treatment can reduce the sludge, the incineration treatment also has the problems of high cost and easy generation of secondary pollution, thereby limiting the wide application of the incineration treatment.
The sludge solidification/stabilization technology is characterized in that a curing agent is added into sludge, the sludge forms a stable solidification body by utilizing a chemical reaction, and heavy metals in the sludge are solidified and stabilized, so that the harm to the environment is reduced. The treated sludge has higher strength and lower water permeability, and can be used as building materials or soil for greening. The curing/stabilizing technology has the advantages of simple process, low cost and easy obtaining of curing agent, low treatment cost, no secondary pollution to the environment and the like. At present, cement, lime and the like are commonly used as curing agents, but the addition amount is large, the cost is high, the treatment effect on sludge containing lead, zinc and nickel is poor, and the reuse range of the sludge after curing is limited by using the cement as the curing agent. Therefore, the development of a novel sludge curing agent which is economical, efficient and environmentally friendly is urgently needed.
Disclosure of Invention
Aiming at the defects of the existing curing agent, the invention aims to provide a sludge curing agent based on industrial waste residue and an application method thereof. The sludge curing agent disclosed by the invention takes industrial waste residues as raw materials, can realize rapid dehydration of sludge, can realize solidification and stabilization of various heavy metal ions in the sludge at normal temperature, not only realizes comprehensive utilization of solid wastes, but also reduces the disposal cost of the sludge, and has good economic and environmental benefits.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
the sludge curing agent based on the industrial waste residue comprises the following components in percentage by mass:
preferably, the sludge curing agent comprises the following components in percentage by mass:
preferably, the specific surface area of the fly ash is 300-600m2G, mainly comprising SiO2、Al2O3CaO, etc., wherein SiO2And Al2O3Is more than 35 percent. Active material SiO in fly ash2、Al2O3The pozzolan reaction is carried out under the alkaline environment condition provided by cement clinker, steel slag powder and excitant to generate calcium silicate hydrate gel and calcium aluminate hydrate gel, thereby increasing the compression strength, the tensile strength, the bending strength and the shear strength of the solidified body.
Preferably, the steel slag powder is prepared into powder with the average particle size of less than 10 mu m after being finely ground by converter steel slag, and contains mineral phases such as silicate minerals, aluminate minerals, iron aluminate minerals and the like, wherein the mass percentage of the silicate minerals is more than 45%. The minerals in the steel slag powder have the capability of hydration reaction to generate hydrated calcium silicate gel and Ca (OH)2. Wherein the slag powder hydration product Ca (OH)2Can provide alkaline environment for volcanic ash reaction of fly ash, accelerate the reaction process, and the same asCa (OH) consumed by pozzolan reaction2But also can further promote the hydration reaction of the steel slag powder.
Preferably, the main mineral phases of the electrolytic manganese slag are gypsum, quartz, chlorite and the like, wherein the sulfate types mainly comprise dihydrate gypsum, ammonium sulfate, manganese sulfate and the like, and the content of the dihydrate gypsum accounts for 60-70% of the total sulfate. The sulfate of the electrolytic manganese slag can be used as an active excitant for the volcanic ash reaction of the fly ash to ensure that an active substance SiO2And Al2O3Simultaneously receives an alkaline activator and SO4 2-The synergistic excitation of the calcium silicate hydrate gel and the calcium aluminate hydrate gel is generated, and the calcium sulphoaluminate hydrate mineral substances can be generated, so that the strength of the consolidation body is further improved.
Preferably, the excitant is NaOH or Na2CO3、Na2SO4、NaH2PO4、Na2SiO3·9H2O、MgSO4Can provide free OH for the system-And the chemical bond of the fly ash is destroyed, and sufficient conditions are provided for structural recombination.
The cement clinker and the alkaline activator in the curing agent of the invention can form OH after being dissolved in water-Can promote the dissolution and structural disintegration of the steel slag powder and the fly ash, and the hydration of the steel slag powder can also generate Ca (OH)2The alkalinity of the system can be further improved, and the disintegration speed of the fly ash is accelerated. Meanwhile, the active ingredient (SiO) in the fly ash2、Al2O3) Hydration products with steel slag powder Ca (OH)2The volcanic ash reaction is carried out to generate hydrated calcium silicate gel and hydrated calcium aluminate gel, and the hydration reaction of the steel slag powder is promoted. In addition, the sulfate in the electrolytic manganese slag can also stimulate the volcanic ash reaction of the fly ash, further accelerate the volcanic ash reaction of the system, and the hydration product hydrated calcium aluminate gel continuously reacts with the sulfate to generate hydrated calcium sulphoaluminate mineral substances. Based on the synergistic effect of the components, the sludge curing agent which can efficiently cure/stabilize heavy metals, has high consolidation strength and is low in price is prepared. The curing agents of the present invention are prepared by chemical reactionThe hydraulic gel is generated to wrap the heavy metals in the sludge, so that the heavy metals are difficult to migrate in a structural channel of a product, and can be in-phase or in-phase contact with soil particles, thereby improving the effects of hydrolysis and hydration reaction, ion exchange, agglomeration and the like, improving the strength of a consolidation body, and realizing the rapid dehydration of the sludge and the solidification/stabilization of the heavy metals at normal temperature.
The invention also provides an application method of the sludge curing agent based on the industrial waste residue, which comprises the following steps:
s1) weighing the sludge curing agent raw materials according to a set ratio, and ball-milling the raw materials in a ball mill to obtain the sludge curing agent for later use;
s2) according to the mass ratio of the sludge to the sludge curing agent of 1: (0.04-0.15), weighing, putting into a stirrer, mixing and stirring, stirring for 10-30 minutes, ventilating and airing at room temperature for 1-3 days, and then pressing and forming to obtain a test block;
s3) standing and maintaining the test block at room temperature for not less than 7 days to obtain a sludge consolidation body.
Preferably, the sludge is sludge of an urban sewage plant, and the water content is 75-85%.
The invention has the beneficial effects that:
the curing agent mainly takes industrial waste residues as raw materials, has simple preparation process, and reduces the cost of the curing agent on one hand; on the other hand, a large amount of industrial solid waste is consumed, the resource utilization of the industrial solid waste is realized, and the environmental pollution caused by improper disposal and stockpiling of the industrial solid waste is reduced. In addition, compared with the traditional cement, the curing agent has higher consolidation strength and lower sludge treatment cost, can realize high-efficiency solidification and stabilization of various heavy metal ions in the sludge, greatly reduces the leaching concentration of the heavy metals in a consolidation body, and reduces the pollution of the heavy metals in the sludge to soil, water and the like.
Detailed Description
The following further illustrates embodiments of the invention:
example 1
A method for solidifying a sludge solidifying agent based on industrial waste residues comprises the following steps:
weighing a certain amount of the following raw materials in percentage by mass: after being uniformly mixed, 12% of cement clinker, 25% of fly ash, 50% of steel slag powder, 10% of electrolytic manganese slag and 3% of exciting agent are placed in a ball mill for ball milling for 60min to obtain a curing agent, wherein the exciting agent is sodium carbonate;
(2) according to the mass ratio of sludge (lead ion initial concentration 670mg/L, zinc ion initial concentration 1520mg/L, nickel ion initial concentration 870mg/L) of the urban sewage plant to curing agent of 1: adding a curing agent in a proportion of 0.1, putting the mixture into a stirrer, mixing and stirring the mixture for 10 to 30 minutes, airing the mixture for 1 to 3 days at room temperature in a ventilating way, and then pressing and molding the sludge by a machine to prepare a cylindrical test block of 10 multiplied by 10 cm;
(3) the prepared test block is statically maintained at room temperature, and then unconfined compressive strength and leaching tests are carried out on the maintained test block, and the obtained test results are as follows: the compressive strength of the lead is 2.7MPa in 7 days and 3.9MPa in 28 days, and the leaching result of the lead is 28mg/L, which is reduced by 95.8%; the leaching result of zinc is 115mg/L, which is reduced by 92.4%; the leaching result of nickel is 41mg/L, which is reduced by 95.3%.
Example 2
(1) Weighing a certain amount of the following raw materials in percentage by mass: after being uniformly mixed, 12% of cement clinker, 30% of fly ash, 45% of steel slag powder, 10% of electrolytic manganese slag and 3% of exciting agent are placed in a ball mill for ball milling for 60min to obtain a curing agent, wherein the exciting agent is magnesium sulfate;
(2) according to the mass ratio of sludge (lead ion initial concentration 670mg/L, zinc ion initial concentration 1520mg/L, nickel ion initial concentration 870mg/L) of the urban sewage plant to curing agent of 1: adding a curing agent in a proportion of 0.1, putting the mixture into a stirrer, mixing and stirring the mixture for 10 to 30 minutes, airing the mixture for 1 to 3 days at room temperature in a ventilating way, and then pressing and molding the sludge by a machine to prepare a cylindrical test block of 10 multiplied by 10 cm;
(3) the prepared test block is statically maintained at room temperature, and then unconfined compressive strength and leaching tests are carried out on the maintained test block, and the obtained test results are as follows: the compressive strength is 2.0MPa in 7 days and 3.2MPa in 28 days, and the leaching result of lead is 35mg/L, which is reduced by 94.7%; the leaching result of zinc is 125mg/L, which is reduced by 91.7%; the leaching result of nickel is 49mg/L, which is reduced by 94.4%.
Example 3
(1) Weighing a certain amount of the following raw materials in percentage by mass: the method comprises the following steps of uniformly mixing 15% of cement clinker, 30% of fly ash, 41% of steel slag powder, 10% of electrolytic manganese slag and 4% of activator, and placing the mixture in a ball mill for ball milling for 60min to obtain a curing agent, wherein the activator is sodium hydroxide;
(2) according to the mass ratio of sludge (lead ion initial concentration 670mg/L, zinc ion initial concentration 1520mg/L, nickel ion initial concentration 870mg/L) of the urban sewage plant to curing agent of 1: adding a curing agent in a proportion of 0.1, putting the mixture into a stirrer, mixing and stirring the mixture for 10 to 30 minutes, airing the mixture for 1 to 3 days at room temperature in a ventilating way, and then pressing and molding the sludge by a machine to prepare a cylindrical test block of 10 multiplied by 10 cm;
(3) the prepared test block is statically maintained at room temperature, and then unconfined compressive strength and leaching tests are carried out on the maintained test block, and the obtained test results are as follows: the compressive strength is 1.9MPa in 7 days and 2.8MPa in 28 days, and the leaching result of lead is 34mg/L, which is reduced by 94.9%; the leaching result of zinc is 120mg/L, which is reduced by 92.1%; the leaching result of nickel is 55mg/L, which is reduced by 93.6%.
Example 4
(1) Weighing a certain amount of the following raw materials in percentage by mass: after being uniformly mixed, 12% of cement clinker, 30% of fly ash, 50% of steel slag powder, 6% of electrolytic manganese slag and 2% of activator are placed in a ball mill for ball milling for 60min to obtain a curing agent, wherein the activator is sodium hydroxide;
(2) according to the mass ratio of sludge (lead ion initial concentration 670mg/L, zinc ion initial concentration 1520mg/L, nickel ion initial concentration 870mg/L) of the urban sewage plant to curing agent of 1: adding a curing agent in a proportion of 0.1, putting the mixture into a stirrer, mixing and stirring the mixture for 10 to 30 minutes, airing the mixture for 1 to 3 days at room temperature in a ventilating way, and then pressing and molding the sludge by a machine to prepare a cylindrical test block of 10 multiplied by 10 cm;
(3) the prepared test block is statically maintained at room temperature, and then unconfined compressive strength and leaching tests are carried out on the test block maintained for 7 days and 28 days, and the obtained test results are as follows: the compressive strength is 2.6MPa in 7 days and 4.1MPa in 28 days, and the leaching result of lead is 26mg/L, which is reduced by 96.1%; the leaching result of zinc is 101mg/L, which is reduced by 93.4%; the leaching result of nickel is 37mg/L, which is reduced by 95.7%.
Comparative example 1
In the comparative example, the steel slag powder component is replaced by mineral powder:
(1) weighing a certain amount of the following raw materials in percentage by mass: after being uniformly mixed, 12% of cement clinker, 30% of fly ash, 50% of mineral powder, 6% of electrolytic manganese slag and 2% of activator are placed in a ball mill for ball milling for 60min to obtain a curing agent, wherein the activator is sodium hydroxide;
(2) according to the mass ratio of sludge (lead ion initial concentration 670mg/L, zinc ion initial concentration 1520mg/L, nickel ion initial concentration 870mg/L) of the urban sewage plant to curing agent of 1: adding a curing agent in a proportion of 0.1, putting the mixture into a stirrer, mixing and stirring the mixture for 10 to 30 minutes, airing the mixture for 1 to 3 days at room temperature in a ventilating way, and then pressing and molding the sludge by a machine to prepare a cylindrical test block of 10 multiplied by 10 cm;
(3) the prepared test block is statically maintained at room temperature, and then unconfined compressive strength and leaching tests are carried out on the maintained test block, and the obtained test results are as follows: the compressive strength is 1.2MPa in 7 days and 2.1MPa in 28 days, and the leaching result of lead is 151mg/L, which is reduced by 77.5%; the leaching result of zinc is 345mg/L, which is reduced by 77.3%; the leaching result of the nickel is 142mg/L, which is reduced by 83.6 percent.
Comparative example 2
In this comparative example, the electrolytic manganese slag component was replaced with desulfurized gypsum:
(1) weighing a certain amount of the following raw materials in percentage by mass: after being uniformly mixed, 12% of cement clinker, 30% of fly ash, 50% of steel slag powder, 6% of desulfurized gypsum and 2% of activator, placing the mixture in a ball mill for ball milling for 60min to obtain a curing agent, wherein the activator is sodium hydroxide;
(2) according to the mass ratio of sludge (lead ion initial concentration 670mg/L, zinc ion initial concentration 1520mg/L, nickel ion initial concentration 870mg/L) of the urban sewage plant to curing agent of 1: adding a curing agent in a proportion of 0.1, putting the mixture into a stirrer, mixing and stirring the mixture for 10 to 30 minutes, airing the mixture for 1 to 3 days at room temperature in a ventilating way, and then pressing and molding the sludge by a machine to prepare a cylindrical test block of 10 multiplied by 10 cm;
(3) the prepared test block is statically maintained at room temperature, and then unconfined compressive strength and leaching tests are carried out on the maintained test block, and the obtained test results are as follows: the compressive strength is 1.0MPa in 7 days and 1.7MPa in 28 days, and the leaching result of lead is 173mg/L, which is reduced by 74.2%; the leaching result of zinc is 378mg/L, which is reduced by 75.1%; the leaching result of the nickel is 210mg/L, which is reduced by 75.8%.
Comparative example 3
In this comparative example, the electrolytic manganese slag component was replaced with quicklime:
(1) weighing a certain amount of the following raw materials in percentage by mass: after being uniformly mixed, 12% of cement clinker, 30% of fly ash, 50% of steel slag powder, 6% of quicklime and 2% of activator are placed in a ball mill for ball milling for 60min to obtain a curing agent, wherein the activator is sodium hydroxide;
(2) according to the mass ratio of sludge (lead ion initial concentration 670mg/L, zinc ion initial concentration 1520mg/L, nickel ion initial concentration 870mg/L) of the urban sewage plant to curing agent of 1: adding a curing agent in a proportion of 0.1, putting the mixture into a stirrer, mixing and stirring the mixture for 10 to 30 minutes, airing the mixture for 1 to 3 days at room temperature in a ventilating way, and then pressing and molding the sludge by a machine to prepare a cylindrical test block of 10 multiplied by 10 cm;
(3) the prepared test block is statically maintained at room temperature, and then unconfined compressive strength and leaching tests are carried out on the maintained test block, and the obtained test results are as follows: the compressive strength is 1.3MPa in 7 days and 1.9MPa in 28 days, the leaching result of lead is 144mg/L, and the reduction is 78.5%; the leaching result of zinc is 353mg/L, which is reduced by 76.7%; the leaching result of nickel is 185mg/L, which is reduced by 78.7%.
Comparative example 4
In this comparative example, the steel slag powder component was replaced with fly ash:
(1) weighing a certain amount of the following raw materials in percentage by mass: after being uniformly mixed, 12% of cement clinker, 80% of fly ash, 6% of electrolytic manganese slag and 2% of activator are placed in a ball mill for ball milling for 60min to obtain a curing agent, wherein the activator is sodium hydroxide;
(2) according to the mass ratio of sludge (lead ion initial concentration 670mg/L, zinc ion initial concentration 1520mg/L, nickel ion initial concentration 870mg/L) of the urban sewage plant to curing agent of 1: adding a curing agent in a proportion of 0.1, putting the mixture into a stirrer, mixing and stirring the mixture for 10 to 30 minutes, airing the mixture for 1 to 3 days at room temperature in a ventilating way, and then pressing and molding the sludge by a machine to prepare a cylindrical test block of 10 multiplied by 10 cm;
(3) the prepared test block is statically maintained at room temperature, and then unconfined compressive strength and leaching tests are carried out on the maintained test block, and the obtained test results are as follows: the compressive strength is 1.5MPa in 7 days and 2.3MPa in 28 days, and the leaching result of lead is 138mg/L, which is reduced by 79.4%; the leaching result of zinc is 320mg/L, which is reduced by 78.9%; the leaching result of nickel is 156mg/L, which is reduced by 82.1%.
The foregoing embodiments are illustrative of the principles and preferred embodiments of this invention, and various changes and modifications can be made therein without departing from the spirit and scope of the invention, which is to be protected.
Claims (8)
1. A sludge curing agent based on industrial waste residue is characterized in that: the composition comprises the following components in percentage by mass:
the sum of the weight percentages of the components is 100 percent.
2. The industrial residue-based sludge curing agent according to claim 1, wherein: the curing agent comprises the following components in percentage by mass:
3. the industrial residue-based sludge curing agent according to claim 1 or 2, wherein: the specific surface area of the fly ash is 300-600m2G, mainly comprising SiO2、Al2O3CaO component of SiO2And Al2O3Is more than 35 percent.
4. The industrial residue-based sludge curing agent according to claim 1 or 2, wherein: the steel slag powder is prepared by finely grinding converter steel slag into powder with the average particle size of less than 10 mu m, and mainly contains silicate minerals, aluminate and iron aluminate minerals, wherein the mass percentage of the silicate minerals is more than 45%.
5. The industrial residue-based sludge curing agent according to claim 1 or 2, wherein: the main mineral phases of the electrolytic manganese slag are gypsum, quartz and chlorite, wherein sulfate types mainly comprise dihydrate gypsum, ammonium sulfate and manganese sulfate, and the content of the dihydrate gypsum accounts for 60-70% of the total sulfate.
6. The industrial residue-based sludge curing agent according to claim 1 or 2, wherein: the activator is NaOH or Na2CO3、Na2SO4、NaH2PO4、Na2SiO3·9H2O、MgSO4One or more of the above components are compounded.
7. The method for using the sludge solidifying agent of any one of claims 1 to 6, comprising the steps of:
s1) weighing the sludge curing agent raw materials according to a set ratio, and ball-milling the raw materials in a ball mill to obtain the sludge curing agent for later use;
s2) according to the mass ratio of the sludge to the sludge curing agent of 1: (0.04-0.15), weighing, putting into a stirrer, mixing and stirring, stirring for 10-30 minutes, ventilating and airing at room temperature for 1-3 days, and then pressing and forming to obtain a test block;
s3) standing and maintaining the test block at room temperature for not less than 7 days to obtain a sludge consolidation body.
8. The application method according to claim 7, characterized in that: the sludge is sludge of an urban sewage plant, and the water content is 75-85%.
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| CN113526923A (en) * | 2021-05-13 | 2021-10-22 | 西北矿冶研究院 | High-sulfur iron tailing filling curing agent and preparation method thereof |
| CN114410974A (en) * | 2021-12-27 | 2022-04-29 | 北京科技大学 | Synchronous stabilizing material for multiple harmful heavy metals in lead smelting slag |
| CN114920518A (en) * | 2022-05-26 | 2022-08-19 | 湘潭大学 | Riverway sludge and electrolytic manganese slag double-doped baking-free brick and preparation method thereof |
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| CN114920518B (en) * | 2022-05-26 | 2023-07-21 | 湘潭大学 | Riverway sludge and electrolytic manganese slag double-doped baking-free brick and preparation method thereof |
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