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Preparation method of spherical geopolymer with high aperture ratio and hierarchical pore structure

A geopolymer, multi-level pore technology, applied in ceramic products, other household appliances, cement production, etc., can solve the problem of small average particle size of microspheres, difficult to prepare geopolymers with high open porosity, low porosity and other problems, to achieve the effect of simple implementation, wide application prospects, and high porosity

Active Publication Date: 2021-08-06
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the technical problems of the low porosity of existing spherical geopolymers, the small average particle size of microspheres and the difficulty in preparing geopolymers with high porosity, and to provide a high porosity Preparation method of spherical geopolymer with hierarchical pore structure

Method used

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  • Preparation method of spherical geopolymer with high aperture ratio and hierarchical pore structure
  • Preparation method of spherical geopolymer with high aperture ratio and hierarchical pore structure
  • Preparation method of spherical geopolymer with high aperture ratio and hierarchical pore structure

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specific Embodiment approach 1

[0039] Specific embodiment one: the preparation method of a spherical geopolymer with high porosity and hierarchical pore structure according to the present embodiment is carried out according to the following steps:

[0040] Step 1: Slurry preparation: Add aluminosilicate mineral powder to the alkali excitation solution, stir and mix to form a uniform slurry, then add a surfactant, stir until evenly mixed, then add a foaming agent and continue to stir evenly to obtain Geopolymer slurry; the alkali excitation solution is formed by mixing an alkali solution and a silicate solution; wherein the alkali solution is potassium hydroxide solution or sodium hydroxide solution, and the silicate solution is potassium silicate solution , sodium hydroxide solution or lithium hydroxide solution, the mass ratio of alkali solution and silicate solution in the alkali excitation solution is 1: (1 ~ 1.5), the concentration of the alkali solution is 8mol / L ~ 15mol / L , the mass concentration of t...

specific Embodiment approach 2

[0044] Specific embodiment 2: Put the spherical geopolymer of specific embodiment 1 after absorbing the dye in a vacuum sintering furnace, heat at 400-500°C for 3h-4h, and carry out the spherical geopolymer of specific embodiment 1 Recycle.

[0045] The spherical geopolymer of Embodiment 1 can be recycled more than 10 times, and the removal efficiency of dyes after recycling can still be greater than 90%. At the same time, due to the improved process, the spherical geopolymer has a multi-level pore structure with high open porosity, and has more excellent adsorption performance.

Embodiment 1

[0046] Embodiment 1: a kind of preparation method of the spherical geopolymer of high porosity rate hierarchical pore structure is carried out according to the following steps:

[0047] Step 1: Slurry preparation: first add aluminosilicate mineral powder to the alkali excitation solution, stir and mix at 600rpm for 40min to form a uniform slurry, then add sodium lauryl sulfate, stir at 800rpm until mixed for 2min, then add The hydrogen peroxide solution with a mass fraction of 3% was continuously stirred at 800 rpm for 5 min to obtain a geopolymer slurry; the alkali excitation solution was composed of a 13mol / L sodium hydroxide solution and a 40% sodium silicate The solution is mixed at 300rpm at a mass ratio of 1:1.25, wherein the modulus of the sodium silicate solution is 2.7, and the aluminosilicate mineral powder is a mixture of metakaolin and slag at a mass ratio of 3:7 , the mass ratio of the aluminosilicate mineral powder to the alkali excitation solution is comprehensi...

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Abstract

The invention relates to a preparation method of a spherical geopolymer with a high aperture ratio and a hierarchical pore structure. The invention belongs to the field of geopolymer preparation. The invention aims to solve the technical problems that an existing spherical geopolymer is low in porosity, the average particle size of microspheres is small, and the geopolymer with high aperture ratio is difficult to prepare. The method comprises the steps: step 1, preparing slurry; step 2, curing and balling; and step 3, post-processing. According to the novel method provided by the invention, the spherical geopolymer with the characteristic of a high-porosity communicated hierarchical pore structure can be prepared by designing a suspending agent and adjusting the foaming slurry, the diameter of the prepared spherical geopolymer is 2-3 mm, and the preparation efficiency is greatly improved; and technical support is provided for large-scale utilization of the porous spherical geopolymer, and in addition, the multi-layer suspending agent structure can effectively prevent the prepared spherical geopolymer from being bonded with the bottom of a beaker.

Description

technical field [0001] The invention belongs to the field of geopolymer preparation, and in particular relates to a preparation method of a spherical geopolymer with a high porosity and multi-stage pore structure. Background technique [0002] Geopolymer is a kind of aluminum oxide tetrahedral structural unit AlO 4 and silicon-oxygen tetrahedral unit SiO 4 An inorganic polymer that forms a three-dimensional network structure. Its raw materials have a wide range of sources, and substances rich in aluminosilicates can be used, such as fly ash, slag, coal gangue, metakaolin, etc., which can form a stable three-dimensional network gel structure under the action of an alkali activator. It can be cured in a low temperature environment (60-150°C), and has the characteristics of fast curing speed, high strength, high temperature resistance, acid and alkali resistance, and is also an environment-friendly product that is free from sintering, low energy consumption, and low discharge...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B38/02C04B40/00
CPCC04B28/006C04B40/0028C04B18/141C04B14/106C04B12/04C04B22/062C04B24/16C04B22/068C04B38/02C04B38/0058C04B38/0074C04B38/007Y02P40/10
Inventor 张欢白成英王冬妮管天庆洪洋周伯峻刘旺旺郑婷张晓红乔英杰
Owner HARBIN ENG UNIV
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