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Alkali-activated coal gangue powder geopolymer cementing material and preparation method thereof

A technology of geopolymer and coal gangue powder is applied in chemical instruments and methods, water/sludge/sewage treatment, cement production, etc. Long construction period and other problems, to achieve the effects of low price, improved water absorption, and control of mudding

Active Publication Date: 2020-05-22
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has high construction costs, low construction efficiency, and long construction period, which will seriously affect the progress of excavation work. The problem of muddy impact on equipment has not been fundamentally resolved, nor can it meet the requirements of special construction technology and excavation technology for shafts.

Method used

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  • Alkali-activated coal gangue powder geopolymer cementing material and preparation method thereof
  • Alkali-activated coal gangue powder geopolymer cementing material and preparation method thereof

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preparation example Construction

[0026] refer to figure 1 , the present invention also provides the preparation method of the above-mentioned alkali-excited coal gangue powder geopolymer cementitious material, comprising the following steps:

[0027] Step S1, weighing and mixing coal gangue powder, fly ash and boiler slag in a mass ratio of 1~5:0~7:0~5 to obtain solid waste;

[0028] Step S2, weighing and mixing vitrified microbeads, expanded perlite, and perlite powder in a mass ratio of 5 to 10:0 to 5:0 to 3 to obtain a thermal insulation material;

[0029] Step S3, adding the thermal insulation material and the alkali activator to the solid waste in turn, then adding water and a water reducing agent, and fully stirring and mixing to obtain the alkali-activated coal gangue powder geopolymer cementitious material; wherein, the amount of the thermal insulation material is It accounts for 30% to 60% of the mass of solid waste, the amount of alkali activator accounts for 6% to 8% of the mass of solid waste, th...

Embodiment 1

[0033] Weigh 5kg of coal gangue powder, 25kg of fly ash, and 20kg of boiler slag, add them to the mixer and stir for 1min, fully stir to obtain solid waste; weigh 16.95kg of vitrified microbeads, 3.75kg of expanded perlite, and 4.3kg of perlite powder and fully Stir and mix to obtain thermal insulation material; dissolve analytically pure sodium hydroxide in water, prepare an aqueous NaOH solution, and then mix with water glass to obtain an alkali activator; take 25 kg of thermal insulation material, 3.0 kg of alkali activator, and sequentially add them to 50 kg of solid waste Then add 18kg of water and 0.35kg of polycarboxylate water-reducing agent, stir for 5min and mix thoroughly to obtain alkali-excited coal gangue powder geopolymer cementitious material.

Embodiment 2

[0035] Weigh 20kg of coal gangue powder, 25kg of fly ash, and 5kg of boiler slag, add them to the mixer and stir for 1 min, fully stir to obtain solid waste; weigh 18.75kg of vitrified microbeads, 4.5kg of expanded perlite, and 5.25kg of perlite powder to fully Stir and mix to obtain insulation material; analytically pure sodium hydroxide is dissolved in water, prepared into NaOH aqueous solution, and then mixed with water glass to obtain an alkali activator; 28.5kg of insulation material and 3.9kg of alkali activator are added to 50kg of solid Then, 17.5kg of water and 0.4kg of polycarboxylate water-reducing agent were added to the waste material, and the mixture was stirred for 5 minutes and fully mixed to obtain an alkali-excited coal gangue powder geopolymer cementitious material.

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Abstract

The invention provides an alkali-activated coal gangue powder geopolymer cementing material, which is prepared by mixing solid waste, a thermal insulation material, an alkali activator, a water reducing agent and water, wherein a mass ratio of the thermal insulation material to the solid waste is (0.3-0.6):1, a mass ratio of the alkali activator to the solid waste is (0.06-0.08):1, a mass ratio ofthe water reducing agent to the solid waste is (0.007-0.01):1, a mass ratio of the water to the solid waste is (0.3-0.6):1, the solid waste is composed of coal gangue powder, fly ash and boiler slagaccording to a mass ratio of (1-5):(0-7):(0-5), and the thermal insulation material is composed of vitrified micro-beads, expanded perlite and perlite powder according to a mass ratio of (5-10):(0-5):(0-3). The invention also provides a preparation method of the alkali-activated coal gangue powder geopolymer cementing material.

Description

technical field [0001] The invention relates to the technical field of solid waste utilization, in particular to an alkali-excited coal gangue powder geopolymer cementitious material and a preparation method thereof. Background technique [0002] Coal gangue is a solid waste discharged from the coal mining process and coal washing process. Coal gangue includes the excavation gangue in the process of roadway excavation, the gangue extracted from the roof, bottom plate and interlayer in the excavation process, and the washing gangue picked out in the coal washing process, and its main component is Al 2 O 3 , SiO 2 , and also contains varying amounts of Fe 2 O 3 , CaO, MgO, Na 2 O, K 2 O.P 2 O 5 , SO 3 and trace rare elements (gallium, vanadium, titanium, cobalt). The accumulation of coal gangue in large quantities not only occupies land resources, but also seriously affects the ecological environment. Coal gangue dissolved in water will pollute the nearby soil and g...

Claims

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Application Information

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IPC IPC(8): C04B28/00C02F11/00C04B111/22C04B111/27
CPCC04B28/006C02F11/008C04B2111/00767C04B2111/27C04B2111/22C04B18/12C04B18/08C04B18/10C04B14/24C04B14/185C04B14/18C04B22/062C04B12/04C04B2103/302Y02P40/10
Inventor 王文婧秦渊刘元珍支鑫李珠陈强裴志鹏
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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