Method for producing geopolymer binding material by red mud and geopolymer binding material

Abstract

The invention discloses a method for producing a geopolymer binding material by red mud and the geopolymer binding material. The method comprises the following steps: (1), the red mud is evenly mixed with hydroxide of alkali metal or carbonate, and 3 to 5 mol of alkali metal is contained in the hydroxide of alkali metal or the carbonate, which is added into the red mud per kilogram; (2), the mixture is calcined for 1 to 3 hours at the temperature of 700 DEG C to 900 DEG C, and a heat-alkali activated red mud is obtained after cooling; (3), the activated red mud is mixed with granulated blast-furnace slag powder according to the mass ratio of (1.5:1):(4:1). When being used, the geopolymer binding material produced according to the method is evenly mixed with water with the mass ratio of 60 percent to 70 percent so as to achieve maintenance formation. According to the invention, waste material red mud produced by using Bayer processes largely is environmentally friendly and low in cost. The geopolymer binding material can be directly added with water to stir during the use, alkaline boosters such as water glass and the like are not required to be added, steaming and pressing or dried formation are not required, the use is convenient, and the adaptability is good.

Description

technical field [0001] The invention belongs to the field of geopolymer gelling materials, and more specifically relates to a method and a product for producing geopolymer gelling materials from red mud. Background technique [0002] Red mud (Red Mud) is a large amount of alkaline residue discharged after alkaline treatment of bauxite in alumina plants. It is a large amount of harmful industrial waste. According to the production process, it can be divided into sintering method red mud, Bayer method red mud and combined method red mud. The use of red mud to produce building materials can consume a large amount of red mud, which is the main way to reduce the pollution of red mud to the environment. At present, the method of using red mud to produce building materials mostly uses sintering red mud and combined red mud, because it contains 2CaO·SiO, a mineral component similar to ordinary Portland cement clinker. 2 . [0003] However, Bayer red mud does not contain 2CaO·SiO ...

AI Technical Summary

Problems solved by technology

Yet the existing method of producing geopolymer cementitious material with Bayer process has the following three disadvantages: 1, the dissolution rate of silicon and aluminum in the red mud of existing activation method Bayer process is low, need to add other active silicon, aluminum Raw materials with high content are used to improve the strength of the final geopolymer, resulting in a low amount of red mud added in the Bayer process, which mainly acts as a filling aggregate; 2. The prepared solid powder of the geopolymer cementitious material, when used It is also necessary to configure water glass solution or caustic soda aqueous solution on site to stimulate the geopolymer cementitious material, which is inconvenient to use; 3. The existing aluminosilicate cement, that is, the geopolymer cementitious material, requires a certain amount of auxiliary pressure during maintenance Steam curing or drying at high temperature and temperature can only be applied to preformed bricks and tiles, and the scope of application of the product is limited

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