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CN-122010442-A - Preparation method and application of modified sedimentation tank waste residues

CN122010442ACN 122010442 ACN122010442 ACN 122010442ACN-122010442-A

Abstract

The invention relates to the technical field of concrete, and discloses a preparation method and application of modified sedimentation tank waste residue, wherein the preparation method comprises the steps of uniformly mixing and stirring sedimentation tank waste residue, steel slag, metakaolin, red mud, nickel slag and copper slag to obtain mixed waste residue, adding alkaline solution, stirring and soaking for 2-3 hours to obtain waste residue impregnating material; adding additive into the waste residue impregnating material, then wet grinding to obtain waste residue slurry, drying the waste residue slurry, spraying modification solution and solidifying so as to obtain the modified sedimentation tank waste residue. The invention takes industrial solid waste such as waste residue of a sedimentation tank, steel slag and the like as raw materials, and obtains the high-performance material with hierarchical porous structure and amino and hydroxyl functional groups through alkaline leaching activation, wet grinding and modification technology, thereby solving the problems of accumulation and landfill of the waste residue of the traditional sedimentation tank and endowing the waste residue of the sedimentation tank with high adsorption activity and gelation capability.

Inventors

  • LIU YU
  • CHENG RUI

Assignees

  • 南通理工学院

Dates

Publication Date
20260512
Application Date
20260114

Claims (10)

  1. 1. The preparation method of the modified sedimentation tank waste residue is characterized by comprising the following steps: s1, uniformly mixing and stirring waste residue of a sedimentation tank, steel slag, metakaolin, red mud, nickel slag and copper slag to obtain mixed waste residue, adding an alkaline solution, and stirring and soaking for 2-3 hours to obtain a waste residue impregnating material; S2, adding an additive into the waste residue impregnating material in the step S1, and then carrying out wet grinding to obtain waste residue slurry; And S3, drying, spraying a modifying solution and solidifying the waste residue slurry obtained in the step S2 to obtain modified sedimentation tank waste residues.
  2. 2. The preparation method of the modified sedimentation tank waste residue, which is disclosed in claim 1, is characterized in that in step S1, the mass ratio of the sedimentation tank waste residue, steel slag, metakaolin, red mud, nickel slag and copper slag is (55-65): (10-15): (6-10): (5-8): (4-6): (3-5).
  3. 3. The method for preparing modified sedimentation tank waste residue according to claim 1, wherein the total solute concentration of the alkaline solution is 8-12wt%, and the mass ratio of the alkaline solution to the mixed waste residue is 1.5:1 to 2.5:1.
  4. 4. A method for preparing modified settling pond waste residue according to claim 3, wherein the alkaline solution comprises sodium hydroxide, sodium dodecyl sulfate and sodium silicate; The mass ratio of the sodium dodecyl sulfate to the sodium hydroxide is 0.0001:1 to 0.0005:1; the mass ratio of sodium silicate to sodium hydroxide is 0.15:1 to 0.20:1.
  5. 5. The method for preparing modified sedimentation tank waste residue according to claim 1, wherein the additive in step S2 comprises nano silica and zeolite powder; The mass fraction of the nano silicon dioxide in the waste residue slurry is 1% -2.5%; the mass fraction of the zeolite powder in the waste residue slurry is 6% -10%.
  6. 6. The method for preparing modified sedimentation tank waste residue according to claim 1, wherein the modification solution comprises 3-aminopropyl triethoxysilane and 3-glycidoxypropyl trimethoxysilane; the total silane concentration of the modified solution is 2-5wt%; the mass ratio of the 3-aminopropyl triethoxysilane to the 3-glycidoxypropyl trimethoxysilane is 1:1 to 2:1; the mass ratio of the modified solution to the dried waste residue slurry is 0.02:1 to 0.03:1.
  7. 7. A modified sedimentation tank waste residue prepared by the method of claims 1-6, characterized by being applied to the preparation of ecological filter materials, modified polypropylene fibers and low-carbon ecological permeable concrete.
  8. 8. The use of modified sedimentation tank waste residue according to claim 7, wherein the preparation of the ecological filter material comprises the following steps: s41a, uniformly stirring the modified sedimentation tank waste residue, cement, quartz tail mud and water, pouring the mixture into a granulator, and forming the mixture by a cutting device to obtain an ecological filter material blank; And S41b, curing the ecological filter material blank for 24 hours under standard curing conditions to obtain the ecological filter material.
  9. 9. The use of modified sludge as claimed in claim 7 wherein said preparing modified polypropylene fiber comprises the steps of: s42a, premixing polypropylene particles and the modified sedimentation tank waste residues in a high-speed mixer for 5-10min to obtain a polypropylene particle premix; S42b, carrying out melt blending, extrusion granulation, spinning and crushing on the polypropylene particle premix to obtain the modified polypropylene fiber.
  10. 10. The use of the modified sedimentation tank waste residue according to claim 7, wherein the low-carbon ecological permeable concrete comprises the following components in parts by mass: 120-150 parts of modified sedimentation tank waste residue, 1600-1850 parts of ecological filter material, 10-12 parts of modified polypropylene fiber, 130-150 parts of cement, 30-50 parts of silica fume, 60-80 parts of mineral powder and 110-150 parts of water.

Description

Preparation method and application of modified sedimentation tank waste residues Technical Field The invention belongs to the technical field of building materials, in particular to a preparation method and application of modified sedimentation tank waste residues, Background The common wastewater circulation system of the stirring station at present is that wastewater in a flushing tank enters a sedimentation tank after passing through a sand-stone separator, and upper layer reclaimed water and sedimentation tank waste residues are formed after sedimentation. The upper layer recovered water can be used for production and equipment flushing, and the waste residue precipitated to the bottom is mostly treated in a landfill mode at present. The main components of the waste residue of the sedimentation tank are non-hydrated cementing materials, hydration products and the like, the waste residue of the sedimentation tank is alkaline, and the traditional landfill method is used for treating the waste residue of the sedimentation tank to pollute the environment on one hand and waste resources on the other hand. The waste residue of the sedimentation tank is often mainly in a porous structure, and the exterior of the waste residue is wrapped by hydration products such as C-S-H gel, so that the water absorption rate of the waste residue of the sedimentation tank is high, the gelation capacity is weak, and the waste residue can be directly used as a mineral admixture to influence the working performance, the mechanical performance and the durability of concrete. Aiming at the problem, the main treatment mode of the waste residue of the sedimentation tank at present comprises the step of taking the waste residue of the stirring station as a raw material to prepare the artificial aggregate, but the prepared artificial aggregate has low strength, is applied to concrete and has large performance difference with natural aggregate, and can only be applied to low-grade concrete and has low utilization rate. At present, the development of a stirring station to the green low-carbon direction is imperative, and how to solve a great deal of excessive accumulation of waste residues of a sedimentation tank, promote the recycling and high-value application of the waste residues of the sedimentation tank, and reduce the carbon emission of concrete is a problem to be solved by the technicians in the field. Disclosure of Invention The invention aims to provide a preparation method and application of modified sedimentation tank waste residues, which solve the problems that the conventional sedimentation tank waste residues are low in gelation activity, directly utilized to influence the concrete performance, high in energy consumption in a traditional treatment mode and limited in utilization rate, and the concrete is difficult to endow high strength, excellent water permeability and heavy metal adsorption function synchronously, and realize the effects of reducing carbon emission and enhancing the comprehensive performance and environmental benefit of the concrete. The technical scheme adopted by the invention is as follows: According to a first aspect of an embodiment of the present invention, there is provided a method for preparing modified sedimentation tank waste residues, comprising the steps of: s1, uniformly mixing and stirring waste residue of a sedimentation tank, steel slag, metakaolin, red mud, nickel slag and copper slag to obtain mixed waste residue, adding an alkaline solution, and stirring and soaking for 2-3 hours to obtain a waste residue impregnating material; S2, adding an additive into the waste residue impregnating material in the step S1, and then carrying out wet grinding to obtain waste residue slurry; And S3, drying, spraying a modifying solution and solidifying the waste residue slurry obtained in the step S2 to obtain modified sedimentation tank waste residues. In some embodiments, in the step S1, the mass ratio of the waste residue of the sedimentation tank, the steel slag, the metakaolin, the red mud, the nickel slag and the copper slag is (55-65): (10-15): (6-10): (5-8): (4-6): (3-5). In some embodiments, the total solute concentration of the alkaline solution is 8-12wt%, and the mass ratio of the alkaline solution to the mixed waste slag is 1.5:1 to 2.5:1. In some embodiments, the alkaline solution comprises sodium hydroxide, sodium dodecyl sulfate, and sodium silicate; The mass ratio of the sodium dodecyl sulfate to the sodium hydroxide is 0.0001:1 to 0.0005:1; the mass ratio of sodium silicate to sodium hydroxide is 0.15:1 to 0.20:1. In some embodiments, the additives in step S2 include nano silica and zeolite powder; The mass fraction of the nano silicon dioxide in the waste residue slurry is 1% -2.5%; the mass fraction of the zeolite powder in the waste residue slurry is 6% -10%. In some embodiments, the modifying solution comprises 3-aminopropyl triethoxysilane and 3-glycidoxypropyl trimethoxysila