A kind of geopolymer gelling material and preparation method thereof

Abstract

The invention discloses a geopolymer gelling material and a preparation method thereof. The geopolymer cementitious material is made from kaolin and red mud after extracting iron as main raw materials. The invention has simple process, requires less equipment, can process a large amount of red mud, has low cost, is highly scalable, is less affected by the environment, and the prepared geopolymer cementitious material has better mechanical properties, and other characteristic indexes are also comparable to those of Metakaolin geopolymers are basically equivalent or even better. Using red mud after iron extraction to replace part of metakaolin to prepare geopolymers has great significance for improving the comprehensive utilization of red mud.

Description

technical field [0001] The invention belongs to the technical field of inorganic gelling materials, in particular to a geopolymer gelling material and a preparation method thereof. Background technique [0002] Red mud, also known as red mud, is the insoluble and polluting waste residue left after extracting alumina from bauxite in the aluminum industry. Generally, for every 1 ton of alumina produced, 1.0-2.0 tons of red mud is incidentally discharged. With the development of the aluminum industry, the discharge of red mud is increasing. It is estimated that the red mud produced by the alumina industry in the world exceeds 6×10 per year. 7 t, reached 45-50 million tons in 2010, and the accumulated red mud accumulation has reached hundreds of millions of tons. my country adopts methods such as dam building, wet stockpiling, and dry stockpiling to deal with red mud, which not only takes up a lot of land, but also makes a lot of waste lye seep into nearby farmland, causing soi...

AI Technical Summary

Problems solved by technology

At present, the research on the properties of red mud and the influence of red mud content on the performance of geopolymers are still unclear, and the optimal ratio of red mud / metakaolin has not been clearly described. The influence of the hydration and heat resistance of the prepared geopolymer is not clear. At the same time, the iron content in red mud is generally high. Therefore, iron recovery from red mud is an important process to improve the comprehensive utilization of red mud. However, after iron removal There are few studies on the influence of red mud on geopolymers, and there is no clear conclusion

[0006] In order to solve the problems existing in the above-mentioned previous research work, the present invention focuses on the preparation of geopolymer cementitious materials from the red mud after iron extraction. This idea has not been reported in the literature, and it has positive significance for expanding the comprehensive utilization of red mud