Method for preparing geological polymeric material by using low-grade kaolin

Abstract

The invention discloses a method for preparing a geological polymeric material by using low-grade kaolin. The method comprises the following steps (1) uniformly mixing low-grade kaolin and an activator I in a certain proportion, wherein the mass ratio of particle size of solid phase in a mixture to material residue on sieve with 200 meshes is less than10%; (2)insulating calcining the mixture in the step (1) at high temperature of 750-950 DEG C for 2-4 hours, grinding the calcined product to obtain the clinker powder, the mass ratio of clinker powder particle size to material residue on sieve with 200 meshes is less than10%; (3) adding an water solution of an activator II in the clinker powder obtained in the step (2), uniformly mixing, vibrating and compacting, keeping the moisture and conserving at 60-90 DEG C for 2-4 days to obtain the geological polymer material; wherein, the water cement ratio of activator II water solution to clinker powder is 0.2 0.4, and the mass ratio of solid phase in activator II to calcined clinker powder is 0 0.07. The present invention has obvious significance for expanding the sources of raw materials, reducing the cost and improving the use convenience.

Description

technical field [0001] The invention belongs to the field of new cement materials, and in particular relates to a method for preparing geopolymeric materials by using low-grade kaolin. Background technique [0002] Geopolymeric materials (referred to as geopolymers), also known as mineral polymeric materials, geopolymeric cements, alkali-activated cements, etc., are an eco-friendly silica-alumina inorganic material that has been developed in recent years and is expected to replace Portland cement. gelling material. It mainly refers to zeolite-like three-dimensional aluminosilicate mineral polymers containing various amorphous to semi-crystalline. Its typical preparation procedure is: silicon-aluminum raw material → calcination activation → soluble alkali metal aluminosilicate dissolution activation → 20-120 ℃ heat preservation and curing. Geopolymer has rich sources of raw materials, low carbon emissions, low expansion and contraction rate, low permeability, rapid early ...

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Problems solved by technology

The purpose of the present invention is to provide a new method for preparing geopolymeric materials using

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