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CN-121758090-B - Nano composite modified electroplating sludge micro powder and preparation method and application thereof

CN121758090BCN 121758090 BCN121758090 BCN 121758090BCN-121758090-B

Abstract

The invention belongs to the technical field of building materials, and particularly relates to nano composite modified electroplating sludge micro powder and a preparation method and application thereof. The preparation method of the nano composite modified electroplating sludge micro powder comprises the following steps of (1) placing electroplating sludge water quenching slag and nano SiO 2 particles in an air flow pulverizer, carrying nano SiO 2 particle flow by air flow, enabling the nano SiO 2 particle flow to collide with the electroplating sludge water quenching slag, embedding nano SiO 2 particles into surface defects of the electroplating sludge water quenching slag to obtain an intermediate product, and (2) placing the intermediate product in a fluidized bed reactor, heating, spraying modifier solution to the intermediate product in a fluidized suspension state, and enabling the modifier solution to perform in-situ sol-gel coupling on the surface of the intermediate product to obtain the nano composite modified electroplating sludge micro powder. The nano composite modified electroplating sludge micro powder can reach the super-hydrophobic level.

Inventors

  • WU JIAYU
  • WANG HAO
  • CHEN FANG
  • WEN XIAODONG
  • YIN GUANGJI
  • DONG MENG
  • FENG LEI
  • LI CHAOEN

Assignees

  • 宁波工程学院

Dates

Publication Date
20260505
Application Date
20260304

Claims (10)

  1. 1. The preparation method of the nano composite modified electroplating sludge micro powder is characterized by comprising the following steps of: (1) Embedding nano SiO 2 particles, namely placing electroplating sludge water quenching slag and nano SiO 2 particles in an airflow crusher, carrying nano SiO 2 particle flow by utilizing airflow, enabling the nano SiO 2 particle flow to collide with the electroplating sludge water quenching slag, and embedding nano SiO 2 particles into surface defects of the electroplating sludge water quenching slag to obtain an intermediate product; (2) In-situ sol-gel coupling, namely placing the intermediate product into a fluidized bed reactor, heating, spraying a modifier solution to the intermediate product in a fluidized suspension state, and carrying out in-situ sol-gel coupling on the surface of the intermediate product by the modifier solution to obtain the nano composite modified electroplating sludge micro powder; The components of the modifier solution comprise hydrophobic silane and a cross-linking agent, wherein the cross-linking agent is ethyl orthosilicate.
  2. 2. The method for preparing nano composite modified electroplating sludge micropowder according to claim 1, wherein the hydrophobic silane is hexadecyl trimethoxy silane and/or gamma-methacryloxypropyl trimethoxy silane; the mass ratio of the hydrophobic silane to the cross-linking agent is (3-5): 1.
  3. 3. The method for preparing nano composite modified electroplating sludge micropowder as claimed in claim 1, wherein in the step (1), the particle size of the nano SiO 2 is 20-50nm.
  4. 4. The method for preparing nano composite modified electroplating sludge micropowder according to claim 1, wherein in the step (1), the mass ratio of the electroplating sludge water quenching slag to the nano SiO 2 is 100 (1-3); the pressure of the air flow is 0.6-0.8MPa; in the step (1), the self-collision time of the nano SiO 2 particle flow and the electroplating sludge water quenching slag is 10-15min.
  5. 5. The method for preparing nano composite modified electroplating sludge micropowder according to claim 1, wherein in the step (2), the in-situ sol-gel coupling temperature is 110-120 ℃ and the time is 15-30min.
  6. 6. A nanocomposite modified electroplating sludge micropowder, characterized in that the nanocomposite modified electroplating sludge micropowder is prepared by the method of any one of claims 1-5.
  7. 7. A cement, characterized in that the cement comprises the nanocomposite modified electroplating sludge micropowder according to claim 6.
  8. 8. The concrete is characterized by comprising the following components of cementing materials, standard sand, aggregate, a water reducing agent and water; the cementing material comprises the nano composite modified electroplating sludge micro powder as claimed in claim 6.
  9. 9. The concrete according to claim 8, wherein the mass ratio of the cementing material, the standard sand and the aggregate is (400-500): (700-900): (1000-1200); The cementing material comprises 300-400 parts of ordinary Portland cement, 60-150 parts of nano composite modified electroplating sludge micro powder and 40-60 parts of fly ash in parts by mass; The mass ratio of the water reducer to the ordinary Portland cement is (3-6) (300-400); The mass ratio of the water to the ordinary Portland cement is (160-200) to (300-400).
  10. 10. A concrete element, characterized in that it is prepared from a concrete according to claim 8 or 9, comprising the following steps: s1, uniformly dry-mixing the cementing material, adding water and a water reducing agent, and stirring to obtain mixed slurry; S2, adding standard sand and aggregate into the mixed slurry, uniformly stirring, putting into a mould, vibrating, and curing to obtain the concrete member.

Description

Nano composite modified electroplating sludge micro powder and preparation method and application thereof Technical Field The invention belongs to the technical field of building materials, and particularly relates to nano composite modified electroplating sludge micro powder and a preparation method and application thereof. Background The electroplating sludge Water Quenching Slag (WQS) is glassy waste slag formed after high-temperature melting and water quenching treatment of the electroplating sludge. Because of the release of thermal stress during quenching, a large number of micron-sized quenching shrinkage cavities exist on the surface. At present, WQS is mainly used as a cement mixture or a concrete admixture, but the problems are faced in practical application because of irregular particle morphology, smooth surface and deep pits. In the prior art, in order to improve WQS performance, a silane coupling agent is often used for surface modification. However, the conventional modification has obvious defects that firstly, a silane coupling agent can only form a monomolecular layer on the surface of particles, because WQS surfaces are smooth and deep pits exist, a simple organic layer and a matrix are connected by only weak hydrogen bonds or physical adsorption, the adhesion is poor, the organic layer is extremely easy to peel off under the strong shearing force in the concrete stirring and service process to cause hydrophobic failure, secondly, according to a Wenzel model, the super-hydrophobic is realized and must have a micro-nano binary coarse structure, and WQS only has micrometer roughness and lacks a nano structure, so that the conventional modification is difficult to reach a high hydrophobic grade and the hydrophobicity is degraded with the passage of time. Therefore, development of an electroplating sludge-based cementing material capable of constructing a stable micro-nano coarse structure, realizing super-hydrophobic property and having excellent long-term retention capability of hydrophobic property is needed to solve the technical bottleneck. Disclosure of Invention The invention aims to provide nano composite modified electroplating sludge micro powder, a preparation method and application thereof, which are helpful for solving or improving the problems of easy spalling of a hydrophobic modified layer or low hydrophobic grade of electroplating sludge water quenching slag in the prior art. The preparation method of the nano composite modified electroplating sludge micro powder comprises the following steps of (1) embedding nano SiO 2 particles, namely placing electroplating sludge water quenching slag and nano SiO 2 particles into a jet mill, carrying nano SiO 2 particle flow by using air flow, enabling the nano SiO 2 particle flow to collide with the electroplating sludge water quenching slag, embedding the nano SiO 2 particles into surface defects of the electroplating sludge water quenching slag to obtain an intermediate product, and (2) carrying out in-situ sol-gel coupling, namely placing the intermediate product into a fluidized bed reactor, heating, spraying a modifier solution to the intermediate product in a fluidized suspension state, wherein the modifier solution is subjected to in-situ sol-gel coupling on the surface of the intermediate product to obtain the nano composite modified electroplating sludge micro powder, and the components of the modifier solution comprise hydrophobic silane and a cross-linking agent, wherein the cross-linking agent is ethyl orthosilicate. Preferably, the hydrophobic silane is hexadecyl trimethoxy silane and/or gamma-methacryloxypropyl trimethoxy silane, and the mass ratio of the hydrophobic silane to the cross-linking agent is (3-5): 1. Preferably, in the step (1), the particle size of the nano SiO 2 is 20-50nm. Preferably, in the step (1), the mass ratio of the electroplating sludge water quenching slag to the nano SiO 2 is 100 (1-3), the pressure of the air flow is 0.6-0.8MPa, and the self-collision time of the nano SiO 2 particle flow and the electroplating sludge water quenching slag in the step (1) is 10-15min. Preferably, in the step (2), the temperature of the in-situ sol-gel coupling is 110-120 ℃ and the time is 15-30min. The invention also provides nano composite modified electroplating sludge micro powder, which adopts the following technical scheme: the nano composite modified electroplating sludge micro powder is prepared by adopting the method. The invention also provides a cementing material which adopts the following technical scheme that the cementing material comprises the nano composite modified electroplating sludge micro powder. The invention also provides concrete, which adopts the following technical scheme that the concrete comprises the components of cementing materials, standard sand, aggregate, water reducing agent and water, wherein the components of the cementing materials comprise the nano composite modified electropla