Ether amphoteric polycarboxylic acid based dispersant used for wet grinding of wet-discharged fly ash and preparation method of dispersant

Abstract

The invention provides an ether amphoteric polycarboxylic acid based dispersant used for wet grinding of wet-discharged fly ash and a preparation method of the dispersant. The ether amphoteric polycarboxylic acid based dispersant comprises the following components besides water, in parts by weight, 330-350 parts of a polyether macromonomer, 0.5-3.0 parts of sodium methylallyl sulfonate, 1.5-5.0 parts of hydrogen peroxide, 0.5-1.5 parts of ammonium persulfate, 100.8-153 parts of an initiator, 65.5-112 parts of a small monomer solution, 0.5-2.0 parts of sodium hypophosphite monohydrate, and 5-15parts of liquid-state sodium hydroxide. The method comprises the following steps: 1, performing adding for a first time; 2, controlling a temperature; 3, performing adding for a second time; and 4, performing a curing process. The ether amphoteric polycarboxylic acid based dispersant disclosed by the invention adopts multi-element compounding of a quaternary amine, a quaternary phosphine, a sulfonic acid group, a phosphoric acid group and a carboxylic acid group, and adopts allyl polyoxyethylene ether, methyl allyl polyoxyethylene ether and vinyl butyl ether polyoxyethylene ether to provide steric hindrance effects, wherein the allyl polyoxyethylene ether, the methyl allyl polyoxyethylene ether and the vinyl butyl ether polyoxyethylene ether separately have a molecular weight of 1200-1500, targeted adsorption is performed on different components in the fly ash, the process is simple, the working time is relatively short, and the production is simple and convenient.

Description

Technical field: [0001] The invention relates to the field of building materials, in particular to an ether-based amphoteric polycarboxylic acid-based dispersant for wet-discharging fly ash and wet-grinding and a preparation method thereof. Background technique: [0002] Among the fly ash discharge methods, the wet discharge method accounts for a large proportion, and most of the wet discharge ash is stored in the ash yard because the particles are too coarse to be used. If dry grinding methods such as ball mills and vertical mills are used for wet fly ash treatment, the drying energy consumption is high. At present, the processing cost of wet-discharged fly ash is high and cannot be used, resulting in waste of resources and becoming a major source of pollution. The main physical performance indicators of fly ash include fineness, particle morphology, particle gradation, density, loss on ignition, water demand, and volume stability. [0003] Wet grinding can break up slag-...

AI Technical Summary

Problems solved by technology

During the wet grinding process, the product cannot be over-grinded. Re-grinding or over-grinding will lead to agglomeration of the slurry and an increase in viscosity, resulting in an increase in the amount of dispersant added, which will seriously affect the normal operation of the subsequent process.

[0005] Common inorganic dispersants do not have steric hindrance, limited repellency, and cannot reduce the moisture content of wet-milled ultrafine admixtures; while common polymer dispersants are mostly used in other industries, their molecular structure and size cannot adapt The application system of the superfine mineral admixture

Taking polyacrylamide as an example, the low molecular weight of industrial-grade products on the market is more than several million. Its long-chain structure promotes bridging between particles or flocculation and agglomeration of particles through charge neutralization, increasing viscosity. In addition, this molecular level is also It is impossible to achieve the overall effective adsorption of the entire surface area of ​​ultrafine mineral admixture particles of a few microns, so that the application effect of high dispersion and viscosity reduction cannot be achieved, and additional bridging effects will occur

[0006] Patent CN 1373102 A discloses a chemical pretreatment method for wet-discharging fly ash, which is to add activated admixture to wet-discharging fly ash, and after rolling, mixing and static aging treatment, the wet-discharging fly ash is solved. The shortcomings of low activity and large fluctuation of volcanic ash enable it to be developed and applied on a large scale in the fields of road construction and building materials