A method for preparing high-strength geopolymer cementitious material from aluminum ash

A geopolymer and gelling material technology, applied in the field of green solid waste disposal and resource utilization, can solve the problems of low strength of geopolymer products, aluminum nitride pollution, high water consumption, etc., to avoid the release of harmful gases, Less usage, high strength effect

Active Publication Date: 2022-04-15
UNIV OF SCI & TECH BEIJING
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for preparing high-strength geopolymer cementitious material from aluminum ash

Examples

Experimental program
Comparison scheme
Effect test

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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
compressive strengthaaaaaaaaaa
compressive strengthaaaaaaaaaa
compressive strengthaaaaaaaaaa
Login to view more

Abstract

The invention belongs to the field of green disposal and resource utilization of solid waste, and relates to a method for preparing high-strength geological polymer gelling material from aluminum ash. First, the aluminum ash slag is crushed and sieved to separate metal aluminum and other substances. Next, the aluminum ash slag is ball milled and sieved to separate the hard-to-break substances. Mix the undersieve of aluminum ash slag with a certain proportion of alkaline substances, and roast at 200-1100°C for 1-5h. After the roasting is finished, the roasted product is mixed with fly ash and other solid wastes in a certain proportion, water glass is added as the activator, and the geopolymer gelling material is obtained after stirring, injection molding, curing and demoulding. The geopolymer gelling material prepared by the invention has the characteristics of high mechanical properties, and at the same time, no harmful gas is generated during the preparation process. The invention can realize the green disposal and resource utilization of the aluminum ash slag, and has simple process and small environmental burden.

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/26C04B7/153
CPCC04B7/243C04B7/1535Y02P40/10
Inventor 张深根刘波
Owner UNIV OF SCI & TECH BEIJING
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap