A kind of red mud and fly ash geopolymer material formula and preparation method thereof

Abstract

The invention discloses a red mud and coal ash geopolymer material formula, and belongs to the field of comprehensive utilization of waste and preparation of inorganic nonmetal materials. Red mud and coal ash are adopted as basic raw materials, a sodium hydroxide solution is adopted as an exciting agent, and a red mud and coal ash geopolymer material is prepared. The mass ratio of the red mud to the coal ash to the sodium hydroxide solution is 1:1:(0.8-1). The polymer materials of different strengths can be obtained by adding sodium hydroxide solutions of different concentrations. Maintenance is performed at the temperature of 50-80 DEG C for 24-36 h, the polymerization reaction is more sufficient, the geopolymer material of the high strength can be obtained, the highest strength can reach 32 MPa or more in 28 d, and the red mud and coal ash geopolymer material formula can be widely used for a constructional engineering material. According to the geopolymer material, the red mud and the coal ash are utilized, the preparation method is simple, no large number of resources need to be consumed, the consumption of the red mud is large, the purpose of recycling the red mud can be achieved, energy and land are saved, and environment pollution caused by the red mud is eliminated.

Description

technical field [0001] The invention relates to a geopolymer material formula, in particular to a red mud and fly ash geopolymer material formula, and belongs to the technical field of waste comprehensive utilization and building material preparation. Background technique [0002] Red mud is the polluting waste slag discharged when the aluminum industry extracts alumina. It has strong alkalinity. Generally, 1.0-2.0 tons of red mud is produced for every ton of alumina produced. The red mud produced in the world is about 70 million tons every year, and the red mud produced in my country is more than 30 million tons every year. At present, the comprehensive utilization rate of red mud in my country is very low, only 4%, and the accumulated reserves have reached hundreds of millions of tons. With the increase of alumina production in my country and the decline of ore grade, the storage of red mud in my country will continue to increase. A large amount of red mud can only be sta...

AI Technical Summary

Problems solved by technology

Due to the special physical and chemical properties of red mud, there are certain problems in the comprehensive utilization of red mud; for example, there are problems of high cost in the process of extracting valuable metals or difficulties in subsequent treatment, and the alkali content of red mud needs to be dealt with when using red mud to prepare building materials. The amount of admixture in concrete is very small, and it affects the strength of concrete, or the production of bricks with low strength

Due to technical and economic reasons, most of the research work conducted by domestic and foreign scholars on the comprehensive utilization of red mud is still in the laboratory stage, the processing cost is high, and the consumption capacity and secondary utilization of red mud are insufficient.

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