Method for preparing sintering-free cementing material from waste incineration fly ash

A technology of waste incineration fly ash and cementitious materials, which is applied in cement production, etc., to achieve the effects of saving process energy consumption, avoiding secondary pollution problems, and realizing harmless and resourceful utilization

Active Publication Date: 2020-08-28
浙江慧科环保科技有限公司
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  • Claims
  • Application Information

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Problems solved by technology

[0005] Purpose of the invention: In view of the above problems, the present invention proposes a method for preparing non-sintering cementitious materials by using waste incineration fly ash. In the process of preparing cementitious materials, high-temperature sintering is not required, which greatly saves energy consumption and can effectively solve the problem of waste incineration flying ash. Problems caused by heavy metals, dioxins and chloride ions in ash

Method used

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  • Method for preparing sintering-free cementing material from waste incineration fly ash
  • Method for preparing sintering-free cementing material from waste incineration fly ash
  • Method for preparing sintering-free cementing material from waste incineration fly ash

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Effect test

Embodiment 1

[0022] Effect of mass ratio of graphite powder and waste incineration fly ash on the performance of prepared cementitious materials

[0023] Preparation of gelling material: as figure 1 As shown, silicon slag and blast furnace slag were weighed according to the mass ratio of silicon slag and blast furnace slag at 1:1, mixed and ground, and passed through a 200 mesh sieve to obtain a mixed silicon material; according to the mass ratio of graphite powder and waste incineration fly ash of 0.5:100 , 0.7:100, 0.9:100, 1:100, 3:100, 5:100, 5.5:100, 6.5:100, 7.5:100 respectively take graphite powder and refuse incineration fly ash, mix, get graphite fly ash; Weigh sodium hexametaphosphate, mixed silicon material, and graphite fly ash according to the mass ratio of sodium hexametaphosphate, mixed silicon material, and graphite fly ash of 2:10:100, and mix to obtain a gelled precursor material; according to the liquid-solid ratio of 1 mL: Mix 1mg of water and gelling precursor materia...

Embodiment 2

[0037] Effect of mass ratio of sodium hexametaphosphate, mixed silicon material, and graphite fly ash on the properties of prepared cementitious materials

[0038] Preparation of cementitious material: Weigh silicon slag and blast furnace slag respectively according to the mass ratio of silicon slag and blast furnace slag 1.5:1, mix and grind, pass through a 300-mesh sieve to obtain mixed silicon material; according to the mass ratio of graphite powder and waste incineration fly ash 5:100 respectively take graphite powder and refuse incineration fly ash, mix, get graphite fly ash; According to sodium hexametaphosphate, mixed silicon material, graphite fly ash mass ratio 2:5:100, 2:7:100, 2: 9:100, 0.5:10:100, 1:10:100, 1.5:10:100, 2:10:100, 2:15:100, 2:20:100, 4:10:100, 4:15: 100, 4:20:100, 6:10:100, 6:15:100, 6:20:100, 6.5:20:100, 7:20:100, 7.5:20:100, 6:21:100, 6:23:100 and 6:25:100 respectively weigh sodium hexametaphosphate, mixed silicon material and graphite fly ash, an...

Embodiment 3

[0045] Effect of the mass ratio of aluminum activator and secondary cementitious material on the properties of the prepared cementitious material

[0046] Preparation of cementitious material: Weigh silicon slag and blast furnace slag respectively according to the mass ratio of silicon slag and blast furnace slag 2:1, mix and grind, and pass through a 400-mesh sieve to obtain mixed silicon material; according to the mass ratio of graphite powder and waste incineration fly ash Take graphite powder and waste incineration fly ash at 5:100 respectively, and mix them to obtain graphite fly ash; weigh sodium hexametaphosphate, mix them according to the mass ratio of sodium hexametaphosphate, mixed silicon material, and graphite fly ash at 6:20:100. Silicon material and graphite fly ash were mixed to obtain gelled precursor material; water and gelled precursor material were mixed according to the liquid-solid ratio of 3mL:1mg, stirred at 480rpm, and simultaneously irradiated with low-...

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Abstract

The invention discloses a method for preparing a sintering-free cementing material from waste incineration fly ash. The method comprises the following steps: (1) mixing silicon slag and blast furnaceslag, grinding, sieving to obtain a mixed silicon material, and mixing graphite powder and waste incineration fly ash to obtain graphite fly ash; (2) mixing sodium hexametaphosphate, the mixed siliconmaterial and graphite fly ash to obtain a gel precursor material; (3) dissolving the gelling precursor material in water, stirring while performing low-temperature plasma irradiation, drying, grinding and sieving to obtain a secondary cementing material; (4) mixing aluminum hydroxide waste and alkaline residues, grinding, and sieving to obtain an aluminum activator; and (5) uniformly mixing the aluminum activator and the secondary cementing material to obtain the cementing material. High-temperature sintering is not needed in the preparation process, so that process energy consumption is greatly reduced; the cementing material can achieve the highest heavy metal curing rate of 99.24%, the highest chlorine removal rate of 98.75% and the highest dioxin substance removal rate of 98.37%; andthe uniaxial compressive strength of a prepared mortar test block is as high as 50.68 MPa.

Description

technical field [0001] The invention relates to resource utilization of domestic garbage incineration fly ash, in particular to a method for preparing non-sintering cementitious materials by using garbage incineration fly ash. Background technique [0002] Domestic waste incineration fly ash refers to the fly ash particles captured by the flue gas evolution system after domestic waste incineration. Domestic waste incineration fly ash contains a variety of toxic and harmful substances, so it is included in the "National Hazardous Waste List" for management. In addition to toxic and harmful substances such as heavy metals and dioxins, domestic waste incineration fly ash also contains a large number of soluble components, such as sulfate, chloride ions, and alkali metal ions. Toxic and harmful substances and easily soluble components in the fly ash of domestic waste incineration are the main reasons that hinder its resource utilization. [0003] At present, the main resource ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/28C04B7/153C04B7/24C04B7/36C04B12/00
CPCC04B7/243C04B7/1535C04B7/24C04B7/36C04B12/005Y02P40/10
Inventor 黄涛宋东平金俊勋刘龙飞周璐璐张树文
Owner 浙江慧科环保科技有限公司
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