Method for preparing foam geopolymer from waste incineration ash

A waste incineration ash and geopolymer technology, which is applied in the production and application of ceramic products and cement, can solve the problems of serious environmental pollution, waste water pollution, large waste water production, etc., and achieve reduced environmental pollution, high economic benefits, and reduced The effect of consumption

Pending Publication Date: 2021-08-27
UNIV OF SCI & TECH BEIJING
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  • Abstract
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Problems solved by technology

At the same time, keep fly ash and polyvinyl chloride at 900°C for 2 hours, 100% of Pb and Zn and 50% of Cu and Mn can be removed, and then metals can be recovered by wet method. This method is mainly aimed at the recovery of heavy metals in waste incineration fly ash. However, the co-processing of chlorides and fly ash will cause de novo reaction and re-synthesis of dioxin, causing serious environmental pollution and high energy consumption
Chinese invention patent (application number 201811035380.7) discloses a polyurethane-epoxy resin interpenetrating polymer network composite material modified by domestic waste incineration bottom ash and its preparation method. Finally, mix the vegetable oil-based polyol and diisocyanate for prepolymerization to obtain a polyurethane prepolymer, and then add epoxy resin and diisocyanate modified bottom ash suspension to the polyurethane prepolymer. Add curing agent after uniformity, remove air bubbles and solidify to obtain domestic waste incineration bottom ash modified polyurethane-epoxy resin interpenetrating polymer network composite material with good mechanical properties and thermal properties; this method effectively improves the mechanical properties and thermal properties of the composite material. Stability, but the preparation process is complicated and the cost is high
The Chinese invention patent (application number 201910629363.4) discloses a method for the harmless treatment of waste incineration fly ash and bottom ash by low-temperature melting, in which the waste incineration fly ash is pretreated by water washing, and the waste incineration bottom ash is subjected to magnetic separation and screening Classification treatment, the bottom ash with different particle sizes is pretreated by water washing, gravity separation and ore grinding, and then granulated together with fly ash. After drying and melting treatment, the obtained granules can provide part of the production raw materials for non-ferrous metallurgy. The pellets prepared by this method have a low melting temperature, which realizes the co-processing of fly ash and bottom ash, but it will produce a large amount of waste water to pollute the environment
[0004] It can be seen that the existing utilization technology for waste incineration fly ash and bottom ash has problems such as high material consumption and energy consumption, large waste water output, and serious secondary pollution. Therefore, it is urgent to develop green and efficient methods for utilizing waste incineration ash

Method used

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  • Method for preparing foam geopolymer from waste incineration ash

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Experimental program
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Effect test

Embodiment 1

[0027] The garbage incineration of the bottom ash and the fly as a mass ratio is 1: 1, and the ball mill mill is mined in the mechanical ball mill, and the ball milling speed is 300 rpm to obtain a mixture. The alkaline excitation agent and the mixture were stirred according to a mass ratio of 1: 1, wherein the basic excitation agent was prepared by the sodium glass and sodium hydroxide according to the mass ratio 2: 1, stirred at 500 rpm, stirring time 30 min, then The slurry was poured, at 80 ° C in the maintenance temperature, maintained for 12 h, the resulting foam geological polymer porosity was 56%, and the compressive strength was 2.1 MPa.

Embodiment 2

[0029] The garbage incineration underhead and fly as averages were 3: 1, and the ball milling mill was ground in the mechanical ball mill, and the ball milling speed 400 rpm was mixed. The alkaline excitation agent and the mixture were stirred according to the mass ratio of 1.5: 1, wherein the basic excitation agent was prepared by the sodium glass and sodium hydroxide according to the mass ratio of 5: 1, stirring the rotational speed of 1000 rpm, stirring time 5 min, then The slurry was poured, at 50 ° C in the maintenance temperature, and the obtained foam geological polymer porosity was 30%, and the compressive strength was 4.8 MPa.

Embodiment 3

[0031] The garbage incineration of the bottom ash and the fly as a mass ratio is 3: 1, and the ball milling mill is 20 h in a mechanical ball mill, and the ball milling speed is 500 rpm to obtain a mixture. The alkaline excitation agent and the mixture were stirred according to the mass ratio of 1: 1, wherein the alkaline excitation agent was prepared by the sodium glass and sodium hydroxide according to the mass ratio of 4: 1, stirring the rotational speed of 800 rpm, stirring time 20 min, then The slurry is poured, at 60 ° C in the maintenance temperature, 20 h, the resulting foam geological polymer porosity is 40%, and the compressive strength is 3.6 MPa.

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Abstract

The invention belongs to the field of comprehensive utilization of solid wastes, and particularly relates to a method for preparing a foam geopolymer from waste incineration ash. The method comprises the following steps: carrying out ball milling on waste incineration bottom ash and fly ash, conducting mixing with an alkaline activator, and conducting stirring, pouring, maintaining and demolding to obtain the porous geopolymer. The waste incineration ash is used as a raw material for preparing the porous geopolymer, so that the economic benefit is high, the environmental pollution is reduced, and harmless treatment and high-value utilization of the waste incineration ash are realized.

Description

Technical field [0001] The present invention belongs to the field of solid waste use, and more particularly to a method of preparing a foam geological polymer for garbage incineration ash, by synergistic treatment of ground ash and flying ash, facilitating waste incineration power plant solid waste. Background technique [0002] With the continuous improvement of people's living standards, urban domestic garbage generation increases significantly. However, domestic waste landfill has high cost, and many cities are facing the difficulties of lack of land resources, and domestic waste incineration has gradually become the main harmless way of urban domestic garbage disposal. Domestic waste incineration can achieve urban domestic waste, reduce and harmless, but still 20% to 30% of solid waste remain in the form of ash. According to the different selection position, domestic waste incineration ash can be divided into bottom ash and flying ash. In my country's domestic waste incinerat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B38/00C04B40/02C04B111/40
CPCC04B28/006C04B2111/40C04B2201/50C04B2111/00017C04B18/10C04B18/08C04B22/00C04B22/062C04B38/00C04B40/0263Y02P40/10
Inventor 张深根张俊杰刘波
Owner UNIV OF SCI & TECH BEIJING
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