Preparation method of single-component early-strength quick-setting geopolymer

Abstract

The invention discloses a preparation method of a single-component early-strength quick-setting geopolymer. The preparation method comprises the following steps: S1, uniformly mixing red mud, blast furnace slag and anhydrite according to a certain mass ratio, and calcining; s2, crushing the calcined solid material, and adding 20-30% by mass of a solid alkaline activator and 10-15% by mass of fly ash; and S3, after mixing, grinding to obtain powder of the geopolymer material, adding other additives, and uniformly mixing. According to the preparation method of the single-component early-strength quick-setting type geopolymer, water can be directly added for mixing application, and the single-component early-strength quick-setting type geopolymer can be quickly reacted and hardened and has excellent physical and chemical properties; on one hand, the activity of the slag and the red mud can be improved, and on the other hand, various metallurgical waste residues such as the red mud and the blast furnace slag are jointly treated and converted into the geopolymer material, so that the treatment difficulty of solid waste resources is reduced, and the utilization rate and the use value of the solid waste resources are greatly improved.

Description

technical field [0001] The invention relates to a preparation method of a geopolymer, in particular to a preparation method of a one-component early-strength quick-setting geopolymer. Background technique [0002] Red mud is the industrial solid waste discharged when the aluminum industry extracts alumina. Because the chemical alkali combined with red mud is difficult to remove and has a large content, and contains fluorine, aluminum and other impurities, it is harmful to the use of red mud. It has always been difficult to do. In addition to occupying a large amount of land during the stacking process of red mud, it is also easy to cause land alkalization and groundwater pollution due to the infiltration of chemical components in red mud into the land. Red mud contains SiO 2 、Al 2 o 3 , CaO, Fe 2 o 3 etc., its activity is low. At present, domestic and foreign methods of processing red mud mainly include sintering method, combined method and Bayer method. The comprehen...

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Problems solved by technology

[0005] Commonly used geopolymer mineral raw materials are one or more composites of mineral powder, fly ash, and metakaolin. The performance of geopolymers is greatly affected by raw materials, and the composition of various mineral materials varies greatly. Silicon and aluminum The large difference in the proportion of elements and the large difference in the activity of mineral components lead to large differences in product performance, poor stability, difficult application, and difficult preparation of geopolymer materials, which lead to extremely limited applications, and excellent early performance and Chemical stability is often not compatible with both

[0006] Chinese patent document CN201910334389.6 discloses a red mud-based one-step geopolymer grouting material and its preparation method. Red mud is used as a raw material, and it is mixed and calcined with an active aluminum silicon source and a solid alkaline activator. The rationality is questionable. Under continuous high-temperature calcination conditions, the aluminum-silicon raw material will react with the basic activator, and on this basis, the reacted geopolymer solid body will be ground, so the geopolymer obtained by this preparation method The strength of materials at all ages is low

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