A method for preparing solid waste base geopolymers by using the stuffy slag method in conjunction with red mud

Abstract

The invention discloses a method for preparing a solid waste based geopolymer material from red mud under the cooperation of a slag smoldering method. The method comprises the following steps: 1) uniformly mixing dried and pulverized coal gangues, alkali, sodium silicate, Bayer red mud and melted steel slag to enable the ratio of SiO2 / Al2O3 in a solid substance to be 3.5 to 4.5 and the ratio of Na2O / Al2O3 to be 0.8 to 1.2; 2) calcining a mixture by utilizing the slag smoldering method; 3) pulverizing the calcined mixture to obtain the solid waste based geopolymer material. According to the method disclosed by the invention, after the Bayer red mud, the coal gangues and an alkali metal material are mixed, a mixture is mixed with the melted steel slag; then calcining activation is carried out through the slag smoldering method, so that the activity of silicon and aluminum is improved; a geopolymer gel material which is stirred by directly adding water and naturally cured and molded can be prepared, so that the technical problems that an existing geopolymer gel material prepared from the Bayer red mud needs to be calcined at high temperature, the red mud needs to be subjected to pressfiltering and evaporation drying to remove water, steam pressing or drying molding and the like are needed in a curing process are solved.

Description

technical field [0001] The invention belongs to the field of geopolymer cementitious materials, and in particular relates to a method for preparing solid waste base geopolymers by using the waste heat of converter steel slag and using the stuffy slag method in cooperation with red mud. Background technique [0002] Geopolymers are a new class of high-performance inorganic polymer materials, and they are the most promising class of alkali-activated gelling materials. Due to its special inorganic polycondensation three-dimensional oxide network structure, geopolymer materials have higher high temperature performance and mechanical properties than polymer materials, cement, ceramics and metals in many aspects; on the other hand, the manufacturing process of geopolymer materials The energy consumption and the discharge of three wastes are very low. The material is environmentally friendly and can be recycled and reused. It is a sustainable "green material". The raw materials fo...

AI Technical Summary

Problems solved by technology

After mixing Bayer process red mud, coal gangue, and alkali metal materials, they are mixed with molten steel slag, and activated through the slag process in the steel slag treatment process to improve the activity of silicon and aluminum, and prepare a product that can be directly formed by adding water and stirring naturally. Geopolymer cementitious materials, thus solving the problem that the geopolymer cementitious materials produced by the Bayer process red mud need high-temperature calcination, red mud needs to be filtered and evaporated to remove water, and the curing process requires autoclave or dry molding technologies. question