Rice hull ash and preparation method thereof, rice hull ash geopolymer and preparation method thereof

Abstract

The invention provides rice hull ash, a preparation method of the rice hull ash, a rice hull ash geopolymer and a preparation method of the rice hull ash geopolymer. The preparation method of the ricehull ash comprises the following steps: soaking rice hulls in an acid solution; taking out the rice husks, washing the rice husks to be neutral, drying the rice husks, and calcining the rice husks incalcining equipment at the temperature of 400-900 DEG C for 0.5-3 hours to obtain the rice husk ash. The invention discloses the preparation method of rice hull ash, K and other impurities hinderingrice hull combustion are removed through soaking treatment in an acid solution, the specific surface area of the rice hull ash is increased, the specific surface area is larger, the surface energy islarger, more active SiO2 is exposed, the volcanic ash activity of the rice hull ash is remarkably improved, and the content of silicon dioxide in the rice hull is remarkably increased and can reach 99.5% or above to the maximum. The rice husks are subjected to high-temperature calcination treatment, so that the content of crystalline silicon dioxide can be obviously reduced, the generation of amorphous silicon dioxide is promoted, the chemical activity is improved, and meanwhile, residual carbon is reduced.

Description

technical field [0001] The invention belongs to the technical field of building materials, and more specifically, the invention relates to a rice husk ash and a preparation method thereof, a rice husk ash geopolymer and a preparation method thereof. Background technique [0002] Vigorously developing waste-recycling new materials is the embodiment of the concept of circular economy and an effective way of sustainable development. Geopolymers have the advantages of being green and low-carbon, and have broad application prospects in the field of building materials. [0003] However, sulfate attack is a severe and rapid degradation process that can cause severe damage to geopolymer structures, such as spalling, cracking, softening, loss of strength expansion, and other forms of material failure. There are two reasons for the loss of geopolymer strength: one is the presence of calcium in the raw materials, which will react with sulfate to form expansion products, such as ettrin...

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Problems solved by technology

Second, in the environment of saline solution, the geopolymer is in direct contact with the solution, and part of the alkali will be leached from the geopolymer with the solution, which cannot provide the necessary alkaline conditions for the reaction, making the raw material react incompletely, resulting in strength loss

[0006] However, rice husks have not been treated and applied in geopolymers at present

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