Coal gangue based geopolymer and preparation method thereof

A coal gangue and polymer technology, applied in the field of building materials, can solve the problems of poor utilization of industrial solid waste and low compressive strength of geopolymers, and achieve the effects of excellent durability, high mechanical strength and low permeability

Inactive Publication Date: 2019-11-08

深圳屹米达环保科技有限公司

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AI-Extracted Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a coal gangue-based geopolymer, which aims to solve the problem of poor utilization of existing geopolymers for industrial solid waste, and...

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Method used

As a preferred embodiment, with the total mass of the gangue coarse aggregate being 100%, the mass percentage of alumina in the gangue coarse aggregate is 10% to 30%, and the amount of silicon dioxide The mass percentage is 50% to 85%. Based on the total mass of the coal gangue fine aggregate as 100%, the mass percentage of alumina in the coal gangue fine aggregate is 10% to 30%, and the mass percentage of silicon dioxide is 50% to 50%. 85%. Taking the total mass of the gangue powder as 100%, the mass percentage of alumina in the coal gangue powder is 10%-30%, and the mass percentage of silicon dioxide is 50%-85%. Coal gangue is a kind of industrial and mining solid waste. It is a mixture of carbonaceous, muddy and sandy shale. It has high carbon content and is stacked in the open air for a long time. A large amount of gas with irritating smell enters the air to pollute the air, causing serious environmental pollution, and at the same time there is a huge potential safety hazard. On the one hand, coal gangue-based geopolymers in the embodiment of the present invention use coal gangue as the main raw material to replace fine aggregates such as sand, coarse aggregates such as stones, and powder materials such as fly ash in conventional geopolymers. It plays the role of skeleton and filling, provides material basis for geopolymer molding, and improves the mechanical strength of geopolymer; The mass percentage of aluminum is 10% to 30%, and the mass percentage of silicon dioxide is 50% to 85%. The high content of alumina and silicon dioxide in coal gangue can better promote the formation of coal gangue and alkali activator. Other raw material components undergo chemical polymerization reactions, enhance the polymerization effect between raw material components, and generate coal gangue-based geopolymers with good stability, high compressive strength, excellent durability, and low permeability.

Specifically, in above-mentioned step S10, obtain coal gangue coarse aggregate, coal gangue fine aggregate, coal gangue powder, blast furnace slag and desulfurization gypsum, described coal gangue coarse aggregate, described coal gangue fine aggregate , the coal gangue powder, the bl...

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Abstract

The invention belongs to the technical field of construction materials, and especially relates to a coal gangue based geopolymer. The geopolymer includes the following raw materials and components: 25%-50% of coal gangue coarse aggregate, 20%-40% of coal gangue fine aggregate, 10%-30% of coal gangue powder, 5%-15% of blast furnace slag, 5%-10% of desulfurized gypsum, 1%-10% of an alkali activator,water, and the like. The coal gangue based geopolymer of the invention utilizes industrial solid waste coal gangue as a main raw material, the industrial solid waste coal gangue replaces conventionalsand fine aggregate, stone coarse aggregate, fly ash, and the like, through a polymerization reaction between components such as coal gangue, the blast furnace slag, the desulfurization gypsum, and the alkali activator, the coal gangue based geopolymer is good in stability and is high in strength, the compressive strength can reach 35 MPa after maintenance for three days, the compressive strengthcan reach 60 MPa after maintenance for twenty-eight days, and an early strength agent, cement or the fly ash, and the like do not need to be additionally added.

Application Domain

Solid waste managementCement production

Technology Topic

SlagGypsum +10

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Examples

Experimental program(5)
Effect test(1)

Example Embodiment

[0051] The embodiment of the present invention also provides a preparation method of coal gangue-based geopolymer, including the following preparation steps:

[0052] S10. Obtain coal gangue coarse aggregate, coal gangue fine aggregate, coal gangue powder, blast furnace slag and desulfurized gypsum, and combine the gangue coarse aggregate, the gangue fine aggregate, the gangue powder, the The blast furnace slag is mixed with the desulfurized gypsum to obtain a mixture;

[0053] S20. Obtain an alkali activator, and dissolve the alkali activator in water to obtain an aqueous solution of the alkali activator;

[0054] S30. Adding the aqueous solution of the alkali activator to the mixture for mixing treatment to obtain a coal gangue-based geopolymer slurry;

[0055] S40. Curing the geopolymer slurry into a mold to obtain a coal gangue-based geopolymer.

[0056] The method for preparing coal gangue-based geopolymers provided in the embodiments of the present invention firstly mixes the coal gangue coarse aggregate, coal gangue fine aggregate, coal gangue powder, blast furnace slag and desulfurized gypsum and other gel materials, and then the alkali is excited The agent is dissolved in water to form an alkali activator aqueous solution, and then the alkali activator aqueous solution and the gel material mixture are fully mixed to obtain coal gangue-based geopolymer slurry, which can be obtained by molding and curing. The preparation method of coal gangue-based geopolymer provided by the embodiment of the present invention has a simple process flow and easy operation, which is beneficial to industrialized production and manufacturing.

[0057] Specifically, in the above step S10, the gangue coarse aggregate, gangue fine aggregate, gangue powder, blast furnace slag and desulfurized gypsum are obtained, and the gangue coarse aggregate, the gangue fine aggregate, the Coal gangue powder, the blast furnace slag and the desulfurized gypsum are mixed and processed to obtain a mixture. In the embodiment of the present invention, firstly, coal gangue coarse aggregate, coal gangue fine aggregate, coal gangue powder, blast furnace slag and desulfurized gypsum and other gel materials are mixed and processed to make the components uniformly dispersed, which is convenient for subsequent raw material components to be excited by alkali Under the excitation of the agent, it hydrates and polymerizes to form a stable coal gangue-based geopolymer.

[0058] In some embodiments, the mass percentage of the coal gangue coarse aggregate in the coal gangue-based geopolymer is 25%-50%, and the mass percentage of the coal gangue fine aggregate is 20%-40%, and the coal gangue powder The mass percentage of blast furnace slag is 10%-30%, the mass percentage of blast furnace slag is 5%-15%, and the mass percentage of desulfurized gypsum is 5%-10%.

[0059] In some embodiments, the total mass of the coal gangue coarse aggregate in the coal gangue-based geopolymer is 100%, and the mass percentage of alumina in the coal gangue coarse aggregate is 10%-30% , The mass percentage of silica is 50%-85%; based on the total mass of the coal gangue fine aggregate as 100%, the mass percentage of alumina in the coal gangue fine aggregate is 10% ~30%, the mass percentage of silica is 50%-85%; based on the total mass of the coal gangue powder as 100%, the mass percentage of alumina in the coal gangue powder is 10%~ 30%, the mass percentage of silica is 50%-85%, based on the total mass of the blast furnace slag as 100%, the mass percentage of silica in the blast furnace slag is 40% to 80% The mass percentage of calcium oxide is 20%-40%, and based on the total mass of the desulfurized gypsum as 100%, the mass percentage of calcium sulfate in the desulfurized gypsum is not less than 70%. The particle size of the coal gangue fine aggregate is 1.5-4 mm; the particle size of the coal gangue powder is 0.3-0.075 mm; the particle size of the blast furnace slag is 0.15-0.45 mm; the particle size of the desulfurized gypsum It is 0.2 to 1 mm.

[0060] Specifically, in the above step S20, an alkali activator is obtained, and the alkali activator is dissolved in water to obtain an aqueous solution of the alkali activator. In the present invention, the alkali activator is dissolved in water to form an aqueous solution of the alkali activator, so that the alkali activator can be quickly mixed with coal gangue coarse aggregate, coal gangue fine aggregate, coal gangue powder, blast furnace slag, desulfurized gypsum and other gel materials reaction.

[0061] In some embodiments, the content of the alkali activator in the coal gangue-based geopolymer is 1%-10%, and the alkali activator is selected from at least one of sodium hydroxide, potassium hydroxide, and sodium silicate, Wherein, the purity of the sodium hydroxide is not less than 85%, the purity of the potassium hydroxide is not less than 70%, and the modulus of the sodium silicate is 1.5-3.5.

[0062] Specifically, in the above step S30, the aqueous solution of the alkali activator is added to the mixture for mixing treatment to obtain a coal gangue-based geopolymer slurry. In the embodiment of the present invention, the aqueous solution of the alkali activator is added to the mixture for mixing treatment, so that the alkali activator and the mixture are fully mixed and the polymerization reaction between the alkali activator and the mixture is accelerated to generate silicon calcium sulfate oligomerization. Things.

[0063] In some embodiments, the step of adding the aqueous solution of the alkali activator to the mixture and mixing treatment includes: adding the aqueous solution of the alkali activator to the mixture and stirring for 5 to 30 minutes, and performing stirring treatment Accelerate the polymerization chemical reaction between the alkali activator and the mixture.

[0064] Specifically, in the above step S40, the coal gangue-based geopolymer slurry is cured in a mold to obtain a coal gangue-based geopolymer. After the coal gangue-based geopolymer slurry in the embodiment of the present invention is cured and formed into a mold, a coal gangue-based oligomer is obtained, which can be directly used as a building material.

[0065] As a preferred embodiment, the step of putting the coal gangue-based geopolymer slurry into a mold for curing includes: placing the coal gangue-based geopolymer slurry in a mold, and after vibration treatment, at a temperature of 20 to 80°C and a humidity Curing treatment under 60-100% conditions to obtain coal gangue-based geopolymer. In the embodiment of the present invention, the coal gangue-based geopolymer slurry is inserted into the mold, and the air bubbles in the slurry are eliminated through vibration. The material in the slurry is more dense and uniform, which is beneficial to improve the stability and mechanical strength of the coal gangue-based geopolymer. Curing treatment under the conditions of temperature 20~80℃ and humidity 60~100%, the curing conditions have a wide range of adaptability and strong adaptability.

[0066] As a preferred embodiment, after curing for 3 days, the compressive strength of the coal gangue-based geopolymer is greater than 25 MPa; after 28 days of curing, the compressive strength of the coal gangue-based geopolymer is greater than 50 MPa. The embodiments of the present invention can obtain coal gangue-based geopolymers with different strengths through different curing times. After 3 days of curing, the compressive strength of the gangue-based geopolymers is greater than 25 MPa, indicating that the coal prepared in the embodiments of the present invention The gangue oligomer has high mechanical strength in the initial stage of solidification, and no early strength agent is added; after 28 days of curing, the compressive strength of the gangue-based geopolymer is greater than 50MPa, and the maximum compressive strength can reach 60MPa. It has high strength and can replace high-grade cement concrete in construction materials with high compressive strength. At the same time, it has the advantages of low permeability, excellent durability, environmental protection, and low price. It has a wide application prospect.

Example Embodiment

[0068] Example 1

[0069] A coal gangue-based geopolymer includes preparation steps:

[0070] ① Put 7kg of desulfurized gypsum, 15kg of coal gangue powder, 8kg of blast furnace slag, 30kg of coal gangue coarse aggregate, and 20kg of coal gangue fine aggregate into the mixer and mix evenly to obtain a mixture.

[0071] ② Dissolve 3 kg of powdered sodium silicate and 2 kg of sodium hydroxide in 15 kg of water, and fully stir to dissolve to obtain an aqueous alkali activator solution.

[0072] ③ The alkali activator aqueous solution is poured into the mixer containing the mixture, and the mixing time is 5 minutes to obtain the coal gangue-based geopolymer slurry.

[0073] ④Pour the coal gangue-based geopolymer slurry into the abrasive tool, and place the abrasive tool with the material on the plate vibrator to shake for 5 minutes. Put the mold into the curing box to cure the coal gangue geopolymer. The curing conditions are 30°C temperature and 90% humidity to obtain coal gangue-based geopolymer.

Example Embodiment

[0074] Example 2

[0075] A coal gangue-based geopolymer includes preparation steps:

[0076] ① Put 5kg of desulfurized gypsum, 20kg of coal gangue powder, 10kg of blast furnace slag, 25kg of coal gangue coarse aggregate, and 25kg of coal gangue fine aggregate into the mixer and mix evenly to obtain a mixture.

[0077] ② Dissolve 2 kg of powdered sodium silicate and 1 kg of sodium hydroxide in 12 kg of water, and fully stir to dissolve to obtain an aqueous alkali activator solution.

[0078] ③ The alkali activator aqueous solution is poured into the mixer containing the mixture, and the mixing time is 5 minutes to obtain the coal gangue-based geopolymer slurry.

[0079] ④Pour the coal gangue-based geopolymer slurry into the abrasive tool, and place the abrasive tool with the material on the plate vibrator to shake for 5 minutes. Put the mold into the curing box to cure the coal gangue geopolymer. The curing conditions are 20°C temperature and 90% humidity to obtain coal gangue-based geopolymer.

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PUM

Property	Measurement	Unit
Compressive strength	>= 25.0	mPa
Compressive strength	>= 50.0	mPa
Compressive strength	60.0	mPa
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

High strength
Stable performance

Coal gangue based geopolymer and preparation method thereof

A coal gangue and polymer technology, applied in the field of building materials, can solve the problems of poor utilization of industrial solid waste and low compressive strength of geopolymers, and achieve the effects of excellent durability, high mechanical strength and low permeability

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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