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Method for preparing high-strength geopolymer cementing material from aluminum ash

A geopolymer and gelling material technology, which is applied in the field of green disposal and resource utilization of solid waste, can solve the problems of difficult secondary pollutant treatment, low strength of geopolymer products, aluminum nitride pollution, etc., and achieve environmental protection Small burden, reduced consumption, and the effect of avoiding the release of harmful gases

Active Publication Date: 2021-02-09
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems of aluminum nitride pollution, high water consumption, difficult treatment of secondary pollutants, and low strength of geopolymer products in the existing technology of aluminum ash disposal and preparation of geopolymer cementitious materials, the present invention discloses A method for preparing high-strength geopolymer cementitious material from aluminum ash

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  • Method for preparing high-strength geopolymer cementing material from aluminum ash

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Embodiment 1

[0027] The extrusion crushing device was used to crush the aluminum ash for 30 minutes. The crushed aluminum ash was sieved through a 30-mesh screen to remove coarse materials such as metal aluminum. The weight of the underscreen accounted for 91% of the total weight of the crushed material. The crushed material was dry-milled in a ball mill for 60 minutes, and the aluminum ash slag after ball milling was sieved through a 300-mesh sieve to remove difficult-to-grind materials, and the weight of the underscreen accounted for 98% of the total weight of the ball-milled materials. The ball-milled and sieved aluminum ash was mixed with alkali and calcined at 200 °C for 5 h. The alkali is sodium hydroxide, and the amount of alkali is 30% of the weight of aluminum ash. Mix aluminum ash slag activation material with high-calcium fly ash (calcium oxide content 12%), red mud, steel slag and ball mill. In the mixed material: aluminum ash slag activation material 60 wt.%, fly ash 20 wt.%, ...

Embodiment 2

[0029] The aluminum ash slag was crushed for 60 min by extrusion crushing device, and the crushed aluminum ash slag was sieved through a 30-mesh screen to remove coarse materials such as metal aluminum, and the weight of the underscreen accounted for 97% of the total weight of the crushed material. The crushed material was dry-milled in a ball mill for 240 minutes, and the aluminum ash slag after ball milling was sieved through a 300-mesh sieve to remove difficult-to-grind materials. The ball-milled and sieved aluminum ash was mixed with alkali and calcined at 1100°C for 1 h. The alkali is potassium hydroxide, and the alkali consumption is 5% of the weight of aluminum ash. The aluminum ash slag activation material is mixed with low calcium fly ash (calcium oxide content 7%), red mud, steel slag and ball milled. In the mixed material: aluminum ash slag activation material 30 wt.%, fly ash 40wt.%, red Mud 10 wt.%, steel slag 20 wt.%. Add a mixture of potassium hydroxide and wa...

Embodiment 3

[0031]The extrusion crushing device was used to crush the aluminum ash for 40 minutes. The crushed aluminum ash was sieved through a 30-mesh screen to remove coarse materials such as metal aluminum. The weight of the underscreen accounted for 98% of the total weight of the crushed material. The crushed material was dry-milled in a ball mill for 200 minutes, and the aluminum ash slag after ball milling was sieved through a 300-mesh sieve to remove difficult-to-grind materials, and the weight of the undersize accounted for 99% of the total weight of the ball-milled materials. The ball-milled and sieved aluminum ash was mixed with alkali and calcined at 900 °C for 2 h. The alkali is a mixture of potassium hydroxide and sodium hydroxide, and the amount of alkali used is 30% of the weight of aluminum ash. Mix aluminum ash slag activation material with high-calcium fly ash (calcium oxide content 15%), slag, steel slag and ball mill. In the mixed material: aluminum ash slag activatio...

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Abstract

The invention belongs to the field of green treatment and resource utilization of solid waste, and relates to a method for preparing a high-strength geopolymer cementing material from aluminum ash. The method comprises the following steps: firstly, crushing aluminum ash and conducting screening to separate out substances such as metal aluminum; then, subjecting the aluminum ash to ball milling andscreening to separate out substances difficult to crush; mixing an undersize product of the aluminum ash with a certain proportion of alkaline substances, and carrying out roasting at 200-1100 DEG Cfor 1-5 h; and after roasting is finished, mixing a roasted product with fly ash and other solid waste according to a certain ratio, adding water glass as an exciting agent, and carrying out stirring,injection molding, maintenance and demolding to obtain the geopolymer cementing material. The geopolymer cementing material prepared in the invention has the characteristic of high mechanical properties; and meanwhile, no harmful gas is generated in the preparation process. According to the method, green treatment and resource utilization of the aluminum ash can be realized, process is simple, and environmental burden is small.

Description

technical field [0001] The invention belongs to the field of green disposal and resource utilization of solid waste, and in particular relates to a method for preparing high-strength geological polymer gelling material from aluminum ash. Background technique [0002] Aluminum ash slag is a kind of waste slag produced in the production process of aluminum and aluminum alloy. It mainly comes from infusible inclusions, oxides and various additives floating on the surface of aluminum melt during smelting. For every ton of electrolytic aluminum, primary aluminum alloy and secondary aluminum alloy produced, 30-100 kg of aluminum ash will be produced. Based on this estimate, my country's aluminum ash output will exceed 3 million tons in 2019. Aluminum ash contains a large amount of metal aluminum and alumina, which is a valuable secondary resource. At the same time, it also contains environmental pollutants such as aluminum nitride and fluorine salts. Therefore, aluminum ash has d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26C04B7/153
CPCC04B7/243C04B7/1535Y02P40/10
Inventor 张深根刘波
Owner UNIV OF SCI & TECH BEIJING
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