A method for preparing high-strength foamed ceramic material using fly ash

A technology of foaming ceramics and fly ash, applied in the field of materials, can solve the problems of destroying the ecological environment, threatening human health, waste of land resources, etc., and achieving the effects of low bulk density, high value and good heat insulation

Active Publication Date: 2020-12-15
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, my country's power supply is mainly generated by burning coal. It is estimated that my country's fly ash output reached 540 million tons in 2015. A large amount of fly ash will occupy a large amount of land, resulting in waste of land resources and damage to the ecological environment. Coal ash particles are fine, and the ash will pollute the atmosphere and threaten human health
At present, the comprehensive utilization of fly ash is mainly used as building materials, concrete admixture, cement batching and production of fly ash bricks. High value-added resource utilization technology of coal ash

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Prepare fly ash and clay as raw materials, and prepare magnesia, sodium carbonate, calcium carbonate and sodium metaphosphate as additives; fly ash accounts for 70% by mass percentage in the raw material, and clay accounts for 30%, and magnesium oxide is the total amount of all raw materials in the additive. 5% of the mass, sodium carbonate is 4% of the total mass of all raw materials, calcium carbonate is 4% of the total mass of all raw materials, and sodium metaphosphate is 5% of the total mass of all raw materials;

[0029] Mix all raw materials and additives to form a mixed material, and then use a ball mill for wet grinding, mix evenly and make a slurry; the mass ratio of water, mixed material and grinding balls during wet grinding is 0.5:1:4;

[0030] Inject the slurry into the spray granulator for spray granulation to make powder particles;

[0031] Fill the powder particles into the mold, and then place them in a heating furnace for firing and foaming; the tempe...

Embodiment 2

[0034] Method is with embodiment 1, and difference is:

[0035] (1) Fly ash accounts for 67% by mass percentage in raw materials, and clay accounts for 33%. In the additive, magnesium oxide is 3% of the total mass of all raw materials, sodium carbonate is 5% of the total mass of all raw materials, and calcium carbonate is the total mass of all raw materials. 1% of the mass, sodium metaphosphate is 6% of the total mass of all raw materials;

[0036] (2) The temperature system during the roasting and foaming process is as follows: the furnace temperature rises from room temperature to 700°C at a rate of 7°C / min, holds for 25 minutes, then rises to 1000°C at a rate of 2°C / min, and holds for 80 minutes ;

[0037] (3) The bulk density of the high-strength foamed ceramic material is 0.923g / cm 3 , the compressive strength is 27.45MPa, and the thermal conductivity is 0.29W / (m·K).

Embodiment 3

[0039] Method is with embodiment 1, and difference is:

[0040](1) Fly ash accounts for 76% by mass percentage in raw materials, and clay accounts for 24%. Magnesium oxide is 6% of the total mass of all raw materials in the additive, sodium carbonate is 1% of the total mass of all raw materials, and calcium carbonate is the total mass of all raw materials. 5% of the mass, sodium metaphosphate is 3% of the total mass of all raw materials;

[0041] (2) The temperature system during the roasting and foaming process is as follows: the furnace temperature is raised from room temperature to 850°C at a rate of 10°C / min, kept for 15 minutes, and then raised to 1150°C at a rate of 5°C / min, kept for 50 minutes ;

[0042] (3) The bulk density of the high-strength foamed ceramic material is 0.715g / cm 3 , the compressive strength is 18.92MPa, and the thermal conductivity is 0.24W / (m·K).

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Abstract

The invention relates to a method for preparing high-strength foaming ceramic materials from pulverized coal ash. The method comprises the following steps of (1) preparing and using pulverized coal ash and clay as raw materials, and preparing magnesium oxide, sodium carbonate, calcium carbonate and sodium metaphosphate as additives; (2) performing wet milling on all the raw materials and all the additives by a ball mill to obtain material starch; (3) performing spraying granulating; (4) stuffing processed granules in a mold, performing baking, performing foaming and performing pore forming; and (5) performing cooling in a furnace to room temperature. The method disclosed by the invention is succinct in preparation technology; the resource utilization of the pulverized coal ash is realized;and the obtained products are high in value, high in product strength, good in heat-shielding performance, good in fireproof performance, low in volume density and excellent in property.

Description

technical field [0001] The invention belongs to the technical field of materials, and in particular relates to a method for preparing high-strength foamed ceramic materials using fly ash. Background technique [0002] Foamed ceramics is a porous ceramic material with a porosity of more than 50%, and has excellent properties such as light weight, heat insulation, fire prevention, and sound absorption; foamed ceramics are due to the interface induced crystallization and some metals during the firing process of the raw materials. Oxide acts as a nucleating agent to induce crystallization, causing the main phase in the material to exist in the form of mineral crystals, which is different from foam glass materials. Compared with foam glass materials, foamed ceramics have higher strength and better heat insulation The preparation of high-temperature foamed ceramics is mainly to add an appropriate amount of high-temperature foaming agent, foam stabilizer, flux and other additives t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B33/135C04B33/13C04B38/02
CPCC04B33/13C04B33/1352C04B38/02C04B2235/3201C04B2235/3206C04B2235/3208C04B2235/447C04B2235/5427C04B2235/602C04B2235/656C04B2235/6562C04B2235/6567C04B2235/77C04B2235/96C04B2235/9607Y02P40/60
Inventor 杨合韩建鑫薛向欣马明龙班邵璞
Owner NORTHEASTERN UNIV LIAONING
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