阅读说明：本技术 一种搅拌站废浆湿磨用分散剂 (Dispersant for wet grinding of waste slurry in mixing plant ) 是由 李兴 王军 赵日煦 熊龙 于 2019-11-28 设计创作，主要内容包括：本发明公开了一种搅拌站废浆湿磨用分散剂,各组分及其所占质量百分比包括：胶束稳定组分A 10～20％,分散组分B 1～5％,助磨组分C 5～10％,助磨组分D 5～10％,水55～79％。本发明所述搅拌站废浆湿磨用分散剂采用多组分废浆用配方体系,在提高废浆的湿磨效率的同时,可防止沉降并提高湿磨后浆液的稳定性,实现混凝土搅拌站废浆的高效资源化利用,具有重要的经济和环境效益。(The invention discloses a dispersant for wet grinding of waste slurry in a mixing plant, which comprises the following components in percentage by mass: 10-20% of a micelle stabilizing component A, 1-5% of a dispersing component B, 5-10% of a grinding-aid component C, 5-10% of a grinding-aid component D and 55-79% of water. The dispersant for wet grinding of the waste slurry in the mixing station adopts a formula system for multi-component waste slurry, can prevent sedimentation and improve the stability of the slurry after wet grinding while improving the wet grinding efficiency of the waste slurry, realizes high-efficiency resource utilization of the waste slurry in the concrete mixing station, and has important economic and environmental benefits.)

1. The dispersant for wet grinding of the waste slurry in the mixing station is characterized by comprising the following components in percentage by mass: 10-20% of a micelle stabilizing component A, 1-5% of a dispersing component B, 5-10% of a grinding-aid component C, 5-10% of a grinding-aid component D and 55-79% of water.

2. The dispersant for wet grinding of waste slurry in a mixing plant as claimed in claim 1, wherein the micelle stabilizing component A is a block copolymer capable of self-assembling into micelles, the block copolymer is a polyethylene glycol-polylactic acid-methoxy polyethylene glycol copolymer, the molecular weight is 10000-50000, and the molar ratio of polylactic acid segments, polyethylene glycol segments and methoxy polyethylene glycol segments is 1 (1-5) to (3-50).

3. The dispersant for wet grinding of the waste slurry of the mixing plant according to claim 1, wherein the dispersant component B is prepared by radical polymerization of hydroxybutyl vinyl ether monomer, acrylic acid, cationic monomer and itaconic anhydride as main raw materials; wherein each monomer and the mass percentage thereof comprise: 72-89% of hydroxybutyl vinyl ether monomer, 5-10% of acrylic acid, 5-15% of cationic monomer and 1-3% of itaconic anhydride.

4. The dispersant for wet grinding of the waste slurry of the mixing plant according to claim 3, wherein the preparation method of the dispersing component B comprises the following steps:

1) weighing the raw materials according to a ratio, dissolving hydroxybutyl vinyl ether and an oxidant in water, and heating to 10-50 ℃ to obtain a water solution I;

2) mixing acrylic acid, a cationic monomer, itaconic anhydride and a chain transfer agent, and dissolving in water to obtain a mixed solution II;

3) dissolving a reducing agent in water to obtain a reducing agent solution III;

4) and simultaneously dropwise adding the solution II and the solution III into the aqueous solution I at a constant speed, reacting for 1-3 h at the temperature of 10-50 ℃ after dropwise adding is finished, cooling, and adding alkali to neutralize until the pH value is 5-8, thus obtaining the dispersed component B.

5. The dispersant for wet grinding of the stirring station waste slurry according to claim 3 or 4, wherein the cationic monomer is one or more of methacryloxyethyl trimethyl ammonium chloride, acryloxyethyl trimethyl ammonium chloride and dimethyl diallyl ammonium chloride.

6. The dispersant for wet grinding of waste slurry in a mixing plant according to claim 1, wherein the grinding aid component C is prepared by radical polymerization of methoxy polyethylene glycol methacrylate and maleamic acid as raw materials, wherein the mass percentages of the monomers are as follows: 20-35% of methoxy polyethylene glycol methacrylate and 65-80% of maleamic acid.

7. The dispersant for wet grinding of the waste slurry of the mixing plant according to claim 1, wherein the grinding aid component D is one or more of triethanolamine acetate, triethanolamine oleate, triethanolamine and glycerol.

8. The dispersant for wet grinding of the waste slurry in the stirring station according to claim 1, wherein the mixing amount of the dispersant for wet grinding of the waste slurry in the wet grinding process of the stirring station is 0.5-3% of the total mass of the waste slurry.

Technical Field

The invention belongs to the technical field of building materials, and particularly relates to a dispersant for wet grinding of waste slurry in a mixing plant.

Background

At present, the waste slurry of a concrete mixing plant comprises: a large amount of waste slurry discharged during car washing, a large amount of waste slurry generated after sand and stone separation of unqualified concrete and various waste slurries generated in the production process. The waste slurry has certain activity and can be used as a raw material to be added into concrete. However, the waste slurry has uneven particle size distribution and large particle size range, and if the waste slurry is directly added into concrete, the concrete strength can fluctuate greatly. Under the current large situation of environmental protection requirement, the waste pulp and waste slag cannot be directly discharged, the treatment mode at the present stage comprises various required functions of the waste slag through dry grinding and wet grinding treatment, and the dry grinding of the waste pulp and waste slag has the defects of low powder efficiency and high energy consumption cost.

Wet grinding is a production method for grinding wet materials into slurry, and compared with dry grinding, the wet grinding can reduce the treatment cost, improve the treatment efficiency, reduce the environmental pollution, improve the economic, social and ecological benefits, improve the performance of mineral admixtures and comprehensively improve the performance of cement-based materials. However, the product cannot be over-ground in the wet grinding process, and re-grinding or over-grinding can cause slurry agglomeration and viscosity increase, so that the addition amount of the dispersing agent is increased, and the normal operation of the subsequent process is seriously influenced.

The wet grinding dispersing agent is a chemical additive which is necessary in the wet grinding process, and can improve the grinding efficiency, reduce the viscosity and improve the fluidity of the admixture after wet grinding. The wet grinding dispersing agent reported at present is mainly a dispersing agent of a single grinding substance, common high molecular polymer dispersing agents such as a patent CN107602774A discloses a dispersing agent for wet-discharged fly ash, a patent CN107649068A discloses a low molecular weight cationic polymer dispersing agent for wet grinding, the molecular structure size is difficult to adapt to waste slurry with large particle size range and complex components, and simultaneously small particles are promoted to flocculate and aggregate so as to increase viscosity; common inorganic dispersants lack sufficient steric hindrance effect, so that the milled slurry is unstable and easy to settle.

Disclosure of Invention

The invention mainly aims to provide a dispersant for wet grinding of waste slurry in a mixing station, aiming at the defects in the prior art, the dispersant can improve the grinding efficiency, prevent the slurry from settling after grinding, and is beneficial to ensuring the stability of the slurry after wet grinding and further improving the service performance of the slurry.

In order to achieve the purpose, the invention adopts the technical scheme that:

a dispersant for wet grinding of waste slurry in a mixing station comprises the following components in percentage by mass: the micelle stabilizing component A is 10-20%, the dispersing component B is 1-5%, the grinding aid component C is 5-10%, the grinding aid component D is 5-10%, and water is 55-79% (including water introduced by other components).

In the scheme, the dispersing component A is a segmented copolymer capable of self-assembling into micelles, and the molecular weight of the polyethylene glycol-polylactic acid-methoxy polyethylene glycol copolymer is 10000-50000, wherein the molar ratio of polylactic acid segments to polyethylene glycol segments to methoxy polyethylene glycol segments is 1 (1-5) to (3-50).

In the above scheme, the preparation method of the dispersion component a comprises the following steps: heating polylactic acid, polyethylene glycol and a catalyst (stannous octoate, the dosage of which is 0.5-0.8 percent of the mass of the polylactic acid section) to 160 ℃, reacting for 2-4 h, then adding methoxy polyethylene glycol, and continuing to react for 2-6 h under heat preservation to obtain a dispersed component A.

In the scheme, the dispersing component B is prepared by taking a hydroxybutyl vinyl ether monomer, acrylic acid, a cationic monomer and itaconic anhydride as main raw materials and performing free radical polymerization; wherein each monomer and the mass percentage thereof comprise: 72-89% of hydroxybutyl vinyl ether monomer, 5-10% of acrylic acid, 5-15% of cationic monomer and 1-3% of itaconic anhydride.

In the above scheme, the preparation method of the dispersion component B specifically comprises the following steps:

1) weighing the raw materials according to the proportion, dissolving hydroxybutyl vinyl ether and an oxidant in water, and heating to 10-50 ℃ to obtain a water solution I;

2) mixing acrylic acid, a cationic monomer, itaconic anhydride and a chain transfer agent, and dissolving in water to obtain a mixed solution II;

3) dissolving a reducing agent in water to obtain a reducing agent solution III;

4) and simultaneously dropwise adding the solutions II and III into the aqueous solution I at a constant speed, reacting for 1-3 h at the temperature of 10-50 ℃ after dropwise adding is finished, cooling, and adding alkali to neutralize until the pH value is 5-8, thus obtaining the aqueous solution of the dispersed component B.

In the scheme, the chain transfer agent is thioglycolic acid or 3-mercaptopropionic acid, and the addition amount accounts for 0.05-0.2% of the total weight of all monomers of the dispersed component B; the oxidant is hydrogen peroxide, and the addition amount accounts for 0.5-2% of the total weight of all monomers of the dispersed component B; the reducing agent is vitamin C, and the addition amount of the reducing agent accounts for 0.05-0.2% of the total weight of all monomers of the dispersing component B.

In the scheme, the cationic monomer is one or more of methacryloyloxyethyl trimethyl ammonium chloride, acryloyloxyethyl trimethyl ammonium chloride and dimethyl diallyl ammonium chloride.

In the scheme, the grinding aid component C is prepared by taking methoxy polyethylene glycol methacrylate and maleamic acid as raw materials and performing free radical polymerization, wherein the mass percentages of the monomers are as follows: 20-35% of methoxy polyethylene glycol methacrylate and 65-80% of maleamic acid.

In the scheme, the grinding aid component D is one or more of triethanolamine acetate, triethanolamine oleate, triethanolamine and glycerol.

In the scheme, the mixing amount of the dispersant for wet grinding of the waste slurry in the stirring station in the wet grinding process is 0.5-3% of the total mass of the waste slurry.

Compared with the prior art, the invention has the beneficial effects that:

1) the dispersant for wet grinding of the waste slurry in the mixing station adopts a formula system for multi-component waste slurry, wherein a composite grinding aid component is adopted, and a macromolecule with a short branched chain and a higher amino density is matched with an inorganic micromolecule, so that the grinding efficiency can be enhanced, and the cost can be reduced; meanwhile, the dispersing component B can be adsorbed on the surface of the waste slurry particles and dispersed by utilizing electrostatic repulsion and steric hindrance, and the obtained composite dispersing agent can well coat the surfaces of particles with different particle sizes, so that the integral dispersibility of the waste slurry is increased, the agglomeration problem of small-particle-size particles is prevented, and the grinding efficiency (the particle size of the slurry is reduced) is promoted to a certain extent.

2) The block copolymer capable of self-assembling into micelles is combined to be an amphiphilic copolymer, the block copolymer can self-assemble in an aqueous medium to form micelles with a hydrophobic section as a core and a hydrophilic section as a shell, the small-particle-size particles are dispersed by the dispersing component B, and the dispersed system is more stable by the dispersing component A, so that flocculation caused by over-grinding and sedimentation caused by long-time storage are avoided, the stability of the obtained slurry after wet grinding is further ensured, and the service performance of the slurry is further improved.

3) The dispersant for wet grinding can effectively improve the grinding efficiency and stability of waste slurry, can effectively ensure the working performance and strength of the obtained concrete, can be used for mixing plant waste slurry with complex slurry components, realizes high-efficiency resource utilization of the waste slurry of the concrete mixing plant, and has important economic and environmental benefits.

Detailed Description

In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples.