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Method for preparing porous ceramic by in-situ curing molding of water-based slurry containing aluminum ash

A technology of in-situ solidification and porous ceramics, which is applied in the direction of ceramic products, ceramic material production, clay products, etc., can solve the problems of high cost, inconspicuous pore-forming effect, low addition of aluminum nitride, etc., to achieve low cost and realize The effect of resource disposal and low volume density

Active Publication Date: 2021-10-29
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the use of aluminum nitride as a raw material has the characteristics of high cost. This method is mainly used for solidification and molding of ceramic suspensions with high solid content, and the addition of aluminum nitride is very low (1wt.%-5wt.%), based on the hydrolysis reaction The pore-forming effect is not obvious

Method used

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  • Method for preparing porous ceramic by in-situ curing molding of water-based slurry containing aluminum ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] 1) The aluminum ash slag was crushed by an extrusion crushing device for 10 minutes, and the crushed material was sieved through a 30-mesh sieve, and the weight of the undersize accounted for 90% of the total weight of the crushed material.

[0053] 2) The crushed and sieved materials were dry-milled in a ball mill for 72 hours, 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 98% of the total weight of the ball-milled materials.

[0054] The raw material solid is secondary aluminum ash slag with a mass content of 100%, and dispersant ammonium citrate accounting for 0.05% of the total mass of the raw material solid, binder polyvinyl alcohol accounting for 0.01% of the total mass of the raw material solid, and 0.01% of the total mass of the raw material solid are added. 1% sintering aid SiO 2 Afterwards, it was mixed with water and ball milled for 10 minu...

Embodiment 2

[0058] 1) The aluminum ash slag was crushed by extrusion crushing device for 100 minutes, and the crushed material was sieved through a sieve with an aperture of 30 mesh, and the weight of the undersize accounted for 98% of the total weight of the crushed material.

[0059] 2) The crushed and sieved materials were wet-milled with alcohol in a ball mill for 36 hours, and the milled aluminum ash slag 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.

[0060] The raw material solid is a mixture of aluminum slag and alumina ceramic powder, wherein the mass content of aluminum slag is 15%, and the balance is alumina; and dispersant ammonium polyacrylate, accounting for 1% of the total mass of raw material solid, is added. The binder sodium carboxymethyl cellulose of 8% of the total solid mass of the raw material, and the sintering aid CaO accounting for 0.01%...

Embodiment 3

[0064] 1) The aluminum ash slag was crushed for 60 minutes by an extrusion crushing device, and the crushed material was screened through a 30-mesh sieve, and the weight of the under-sieve accounted for 95% of the total weight of the crushed material.

[0065] 2) The crushed and sieved materials were wet-milled in a ball mill with alcohol for 30 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 98% of the total weight of the ball-milled materials.

[0066] The raw material solid is a mixture of aluminum ash slag and quartz ceramic powder, wherein the mass content of aluminum ash slag is 50%, and the balance is quartz powder; adding 0.5% of the dispersant tetramethylammonium hydroxide, Binder silica sol accounting for 10% of the total mass of raw material solids, sintering aid H accounting for 10% of the total mass of raw material solids 3 BO 3 Afterwar...

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Abstract

The invention discloses a method for preparing porous ceramic through in-situ curing molding of water-based slurry containing aluminum ash, and belongs to the technical field of solid waste green treatment and resource utilization. The method comprises the following steps: adding a dispersing agent, a binder, a sintering aid and water into the aluminum ash or a mixture of the aluminum ash and ceramic powder, and uniformly mixing to obtain solid-liquid mixed phase slurry; heating and curing the slurry in a mold, demolding after molding, drying and sintering to obtain porous ceramic. In the curing process of the slurry, the material containing the Al component is subjected to hydrolysis reaction to play a dual role; aluminum hydroxide sol generated by the hydrolysis reaction fixes the ceramic particles in the raw material components in the aluminum hydroxide sol; gas generated by the reaction forms a porous structure in a green body, so that in-situ curing and self-foaming are realized. The method effectively solves the problems of green treatment and recycling of the aluminum ash by utilizing the component characteristics of the aluminum ash, and has the characteristics of low cost, simple process, high controllability, no need of expensive equipment and easiness in industrial production.

Description

technical field [0001] The invention belongs to the technical field of solid waste green disposal and resource utilization, and in particular relates to a method for preparing porous ceramics by in-situ solidification and molding of aluminum-containing ash slag water-based slurry. Background technique [0002] Aluminum ash is a solid waste generated during the production, consumption and reuse of non-ferrous metal aluminum. With the continuous expansion of the production scale of my country's aluminum industry and the continuous increase of aluminum output, the production of aluminum ash is also increasing. At present, most production enterprises only recycle the primary aluminum ash with high metal aluminum content, and the remaining aluminum slag and secondary aluminum ash after recycling are mostly piled up or landfilled in the form of waste residue, which not only causes a huge waste of aluminum resources waste, but also cause serious pollution to the surrounding enviro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B38/00C04B33/13C04B33/138C04B33/32
CPCC04B38/02C04B38/0025C04B33/138C04B33/1305C04B33/131C04B33/32C04B2235/77C04B2235/96C04B2235/9607Y02P40/60
Inventor 张笑妍张深根李雯昊卫会云杨君洁
Owner UNIV OF SCI & TECH BEIJING
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