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A kind of iron tailings/metakaolin base geopolymer and its preparation method

A geopolymer, metakaolin technology, applied in cement production and other directions, can solve the problems of large environmental pollution, low utilization rate, large discharge of iron tailings and alkali slag, etc., and achieve environmental pollution and safety problems weakening, utilization rate The effect of high and low material cost

Active Publication Date: 2021-06-04
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems and overcome the existing technical defects, the present invention aims to provide a method for utilizing iron tailings, The method of preparing geopolymer materials from metakaolin and alkali slag effectively solves the problem of the treatment of two solid wastes, iron tailings and alkali slag, and enables the solid waste of iron tailings and alkali slag to be resourced and reduced , Harmless, achieved the purpose of treating waste and turning waste into treasure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The component distribution ratio of the iron tailings, metakaolin and alkali slag geopolymer of the present embodiment is: 52.5% of iron tailings; 37.5% of metakaolin; 30%.

[0032] The preparation steps are as follows:

[0033] (1) Take iron tailings, metakaolin and alkali slag according to the proportioning ratio, mechanically stir for 5 minutes, and mix evenly;

[0034] (2) liquid water glass, sodium hydroxide, water are mixed, control its modulus to be 1.4, be mixed with composite alkali activator solution;

[0035] (3) Mix the iron tailings, metakaolin and alkali slag mixture powder in step (1) with the compound alkali activator solution in step (2), and mechanically stir for 5 minutes to prepare the mixture;

[0036] (4) Put the mixture obtained in step (3) into a steel mould, press and form it with a pressure of 5MPa, then place the molded green body in a curing box for 24h under the condition of 80°C, and then place it in the It can be obtained by curing in a...

Embodiment 2

[0039]The component distribution ratio of the iron tailings, metakaolin and alkali slag geopolymer of the present embodiment is: 46.7% of iron tailings; 33.3% of metakaolin; 25%.

[0040] The preparation steps are as follows:

[0041] (1) Take iron tailings, metakaolin and alkali slag according to the proportioning, mechanically stir for 10min, and mix evenly;

[0042] (2) liquid water glass, sodium hydroxide, water are mixed uniformly, control its modulus to be 2.0, make composite alkali activator solution;

[0043] (3) Mix the iron tailings, metakaolin and alkali slag mixture powder in step (1) with the composite alkali activator solution in step (2), and mechanically stir for 10 minutes to prepare the mixture;

[0044] (4) Put the mixture obtained in step (3) into a steel mould, press and form it with a pressure of 8 MPa, then place the molded green body in a curing box for 30 hours at 80°C, and then place it in the It can be obtained by curing in a constant temperature ...

Embodiment 3

[0047] The component distribution ratio of the iron tailings of the present embodiment, metakaolin and alkali slag geopolymer is: 40.8% of iron tailings; 29.2% of metakaolin; 35%.

[0048] The preparation steps are as follows:

[0049] (1) Take iron tailings, metakaolin and alkali slag according to the proportioning ratio, mechanically stir for 8min, and mix evenly;

[0050] (2) liquid water glass, sodium hydroxide, water are mixed uniformly, and its modulus is controlled to be 1.2, and composite alkali activator solution is made;

[0051] (3) Mix the iron tailings, metakaolin and alkali slag mixture powder in step (1) with the compound alkali activator solution in step (2), and mechanically stir for 8 minutes to prepare the mixture;

[0052] (4) Put the mixture obtained in step (3) into a steel mould, press and form it with a pressure of 10 MPa, then place the molded green body in a curing box for 36 hours at 80°C, and then place it in the It can be obtained by curing in a...

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Abstract

The invention specifically relates to a method for preparing geopolymer by using iron tailings, metakaolin and alkali slag as raw materials. The technical solution is to prepare the following components: iron tailings: 40.8-52.5wt%, metakaolin: 29.2-37.5wt%, alkali slag: 10-30wt%, and the mass of the alkali activator solution is the total mass of the solid powder 25 ~ 35wt% of. The preparation steps are as follows: first mix the iron tailings, metakaolin and alkali slag in proportion, then add the alkali activator solution prepared by sodium hydroxide, water and liquid water glass into the well-mixed raw materials, stir , and then pressed into shape, after demoulding, put the sample in the curing box for a certain period of time under the condition of 80 ℃, and then in the standard constant temperature and humidity curing box to cure to the specified age to obtain iron tailings, metakaolin and alkali Slag geopolymer. The invention uses solid waste iron tailings and alkali slag as main raw materials, has simple and environmentally friendly preparation process, low cost, turns waste into treasure, and has great significance for saving resources, saving energy and protecting the environment.

Description

technical field [0001] The invention belongs to the technical field of geopolymers, and in particular relates to a geopolymer prepared by using iron tailings, metakaolin and alkali slag and a method thereof. Background technique [0002] In recent years, with the rapid development of national economic construction, the demand for Ordinary Portland Cement (OPC) is increasing day by day, and its production process not only consumes a large amount of non-renewable resources such as oil, coal and natural gas, but also emits a large amount of CO 2 Greenhouse gases pollute the environment and pose a threat to human health and the ecological environment. According to relevant research reports, geopolymer is a material that can replace cement in performance without causing harm to the environment. Its preparation process has low energy consumption and CO 2 The emission is small, and it is a green and pollution-free gelling material. This cementitious material has the characteristi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B12/00
CPCC04B12/005Y02P40/10
Inventor 王梦婵张惠灵陈永亮武诗怡齐辰晖肖华平
Owner WUHAN UNIV OF SCI & TECH