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Method for preparing geopolymers by taking stone coal vanadium extraction tailings as main raw materials

A technology for extracting vanadium tailings and geopolymers, applied in cement production, etc., can solve the problems that the product strength cannot be greatly improved, the activation method is single, and the durability is not high, so as to achieve good curing effect, simple process and low cost Effect

Active Publication Date: 2015-05-20
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of this activation method is high, the activation method is single, the strength of the final product cannot be greatly improved, and the durability is not high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The invention discloses a method for preparing geopolymer by using the tailings of vanadium extraction from stone coal as the main raw material. The raw materials and contents of the geopolymer are: 55-59wt% of vanadium extraction tailings from stone coal, 4-5wt% of slaked lime, 1.7-2.0wt% of anhydrous sodium sulfate, 15-16wt% of metakaolin, Sodium hydroxide is 9-10wt%, and silica fume is 11-13wt%.

[0038] The preparation of the geopolymer is the following steps, according to the above raw materials and their content:

[0039] The first step, preparation of activator

[0040] Dissolve anhydrous sodium sulfate and slaked lime in water, the water in this step is 27-30wt% of the raw materials, stir evenly, and age for 5-30min to prepare an activator for later use.

[0041] The second step, preparation of activated slag

[0042] Add vanadium extraction tailings from stone coal to the activator, mix evenly, let it stand for 5-10 minutes, put it into a muffle furnace, cal...

Embodiment 2

[0050] The invention discloses a method for preparing geopolymer by using the tailings of vanadium extraction from stone coal as the main raw material. The raw materials and contents of the geopolymer are: 59-63wt% of vanadium extraction tailings from stone coal, 3-4wt% of slaked lime, 1.4-1.7wt% of anhydrous sodium sulfate, 14-15wt% of metakaolin, Sodium hydroxide is 8-9wt%, silica fume is 10-12wt%.

[0051] The preparation of the geopolymer is the following steps, according to the above raw materials and their content:

[0052] The first step, preparation of activator

[0053] Dissolve anhydrous sodium sulfate and slaked lime in water, the water in this step is 27-30wt% of the raw materials, stir evenly, and age for 5-30min to prepare an activator for later use.

[0054] The second step, preparation of activated slag

[0055] Add vanadium extraction tailings from stone coal to the activator, mix evenly, let it stand for 5-10 minutes, put it into a muffle furnace, calcinat...

Embodiment 3

[0063] The invention discloses a method for preparing geopolymer by using the tailings of vanadium extraction from stone coal as the main raw material. The raw materials and contents of the geopolymer are: 63-67wt% of vanadium extraction tailings from stone coal, 2-3wt% of slaked lime, 1.1-1.4wt% of anhydrous sodium sulfate, 13-14wt% of metakaolin, Sodium hydroxide is 7-8wt%, and silica fume is 8-11wt%.

[0064] The preparation of the geopolymer is the following steps, according to the above raw materials and their content:

[0065] The first step, preparation of activator

[0066] Dissolve anhydrous sodium sulfate and slaked lime in water, the water in this step is 27-30wt% of the raw materials, stir evenly, and age for 5-30min to prepare an activator for later use.

[0067] The second step, preparation of activated slag

[0068] Add vanadium extraction tailings from stone coal to the activator, mix evenly, let stand for 5-10 minutes, put it into a muffle furnace, calcinat...

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Abstract

The invention relates to a method for preparing geopolymers by taking stone coal vanadium extraction tailings as main raw materials. The technical scheme is as follows: the method adopts the following raw materials in percentage by weight: 55-76% of stone coal vanadium extraction tailings, 1-5% of hydrated lime, 0.3-2% of anhydrous sodium sulfate, 10-16% of metakaolin, 6-10% of sodium hydroxide and 6-13% of silica fume. The preparation method disclosed by the invention comprises the steps of firstly, uniformly mixing the stone coal vanadium extraction tailings and an activating agent, standing, calcining, and performing mechanical vibration milling to obtain activated slag; then, adding metakaolin and sand, and stirring; finally, adding a liquid alkali activator prepared from sodium hydroxide, silica fume and water, stirring, forming, aging and curing to prepare the stone coal vanadium extraction tailing geopolymers. The method disclosed by the invention is simple in process, low in cost, relatively small in energy consumption, high in tailing utilization ratio and environment-friendly; the prepared geopolymers are relatively high in compression strength, strong in dry shrinkage resistance, good in permeability resistance and high in durability, and have a good curing effect on heavy metal ions.

Description

technical field [0001] The invention belongs to the field of geopolymer technology. In particular, it relates to a method for preparing geopolymer by taking vanadium extraction tailings from stone coal as the main raw material. Background technique [0002] Geopolymers are a new type of inorganic non-metallic cementitious material newly developed in recent years. It is a material that combines the properties of high polymers, ceramics and cement and is superior to the three. Most of these materials use natural aluminosilicate minerals or industrial solid waste as the main raw material, and are excited by a strong alkali solution to form and harden under certain conditions to form a three-dimensional network gel with amorphous and quasi-crystalline characteristics. The internal structure of the geopolymer cementitious material determines that it has the characteristics of good mechanical properties, high durability, good shrinkage resistance, good impermeability, fast harden...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B28/00
CPCY02P40/10
Inventor 张一敏胡芳芳陈铁军刘涛包申旭黄晶
Owner WUHAN UNIV OF TECH
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