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Pulverized fuel ash-based heat storage honeycomb ceramic and preparation method thereof

A technology of honeycomb ceramics and fly ash, which is applied in the field of fly ash-based thermal storage honeycomb ceramics and its preparation, can solve the problems of environmental pollution, increased cost of mullite, scarcity of mullite resources, etc., and achieve low energy consumption , low cost, good thermal shock resistance and corrosion resistance

Inactive Publication Date: 2013-01-16
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, many projects that have been put into production or are about to be put into production are made from high-alumina fly ash (A1 2 o 3 >30%) extract alumina from it and use its residue to produce cement. There are many processes for extracting alumina (aluminum hydroxide) or aluminum salt from fly ash, but there are mainly two types of alkali sintering and acid leaching, but in There are varying degrees of pollution to the environment during the extraction process
[0006] Mullite resources in my country are very scarce, and aluminosilicate is required to be artificially synthesized at high temperature (above 1630°C) through sintering or electrofusion, which greatly increases the cost of mullite

Method used

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  • Pulverized fuel ash-based heat storage honeycomb ceramic and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In terms of mass percentage, weigh 82% of fly ash, 18% of sintering aid (12% of bauxite, 2% of andalusite, 4% of magnesium nitrate), mix the above raw materials, and add 1% of surfactant (0.6% oleic acid, 0.4% simethicone oil) and grind to D 50 =5.3 μm. Move the mixture to a mixer, add 5.6% of binder (2.6% of hydroxypropyl cellulose, 3% of rapeseed oil), 6% of plasticizer (glycerin), 16% of water, wet Mix for 2 hours. The above-mentioned surfactants, binders, plasticizers and water are all added in the form of external additions, and the additions are all measured as a percentage of the total mass of fly ash and sintering aids. The following examples are the same; the fly ash used The mass percent content of aluminum oxide in the medium is 52%.

[0028] After mixing, the wet material is stale for 5 hours, and the mud is roughly refined by a vacuum mud mill (vacuum degree 0.09MPa), and the pressure is kept at 8MPa for 2 minutes. , 8MPa pressure hold for 2min. It was...

Embodiment 2

[0032] In terms of mass percentage, weigh 54% of fly ash, 46% of sintering aid (39% of bauxite, 5% of andalusite, 2% of kaolin), mix the above raw materials, and add 1.3% of surfactant ( Oleic acid) is loaded into a grinder with grinding media (the grinding media is pebbles, and the mass ratio of material: grinding media is 1:2.5) and grinds to D 50 =6.8μm. This mixture is moved to mixer, adds the water of 8% binding agent (carboxymethyl cellulose 3%, tung oil 5%), 4% plasticizer (triethylene glycol caproate), 21%, Wet mix for 2h. The mass percent content of alumina in the fly ash used is 37%.

[0033] After mixing, the wet material is stale for 5 hours, and the mud is roughly refined (vacuum degree 0.09MPa) by a vacuum mud mixer, and the pressure is maintained at 3MPa for 6 minutes. , 3MPa holding pressure for 6min. It was extruded continuously at 18 MPa using an extruder and a die for extrusion molding, and cut with a molybdenum wire. The inner hole of the fly ash-based...

Embodiment 3

[0037] In terms of mass percentage, weigh 66% of fly ash, 34% of sintering aid (27% of bauxite, 4% of andalusite, 3% of kaolin), mix the above raw materials, and add 1.2% of surfactant ( Simethicone) is loaded into a grinding medium (the grinding medium is zirconium silicate, the mass ratio of material: grinding medium is 1:2.5) and ground to D 50 =7.1 μm. Move the mixture to a mixer, add 7.6% of binder (2.6% of hydroxypropyl cellulose, 5% of paraffin), 3.3% of plasticizer (2% of dibutyl phthalate, 1.3% of oxalic acid %), 21% water, wet mixing for 2h. The mass percent content of alumina in the fly ash used is 45%.

[0038] After mixing, the wet material is stale for 8 hours, and the mud is roughly refined (vacuum degree 0.09MPa) by a vacuum mud mixer, and the pressure is maintained at 5MPa for 4 minutes. 5MPa holding pressure for 4min. It was extruded continuously at 18 MPa using an extruder and a die for extrusion molding, and cut with a molybdenum wire. The inner hole o...

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Abstract

The invention belongs to the technical field of inorganic material, and particularly discloses a pulverized fuel ash-based heat storage honeycomb ceramic and a preparation method of the heat storage honeycomb ceramic. The pulverized fuel ash-based heat storage honeycomb ceramic is prepared by pulverized fuel ash, sintering aids, bonding agent, plasticizer, surface active agent and water, wherein the sum of the mass percent of the pulverized fuel ash and the sintering aids is 100%, the pulverized fuel ash accounts for 45-82%, and the sintering aids accounts for 18-55%; and the adding quantity of the bonding agent, the plasticizer, the surface active agent and the water is respectively 3-9%, 3-8%, 0.5-3% and 13-25% of the total quantity of the pulverized fuel ash and the sintering aids by mass percent. The pulverized fuel ash-based heat storage honeycomb ceramic takes the pulverized fuel ash as a base material, and the preparation method of the pulverized fuel ash-based heat storage honeycomb ceramic which is low in raw material cost, high in heat storage capacity, high in strength and good in thermal shock resistance is also disclosed.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a fly ash-based thermal storage honeycomb ceramic and a preparation method thereof. Background technique [0002] Regenerative honeycomb ceramics, also known as high-temperature combustion regenerators, are the key and core components of regenerative high-temperature combustion technology (HTAC technology), and are widely used in various heating industries such as steel, machinery, building materials, petrochemicals, and non-ferrous metal smelting. In furnaces, hot blast furnaces, heat treatment furnaces, cracking furnaces, melting furnaces and oil and gas boilers, this technology uses a reversing device to make the two regenerators alternately absorb heat and release heat to maximize the recovery of heat in the flue gas. Then heat the combustion-supporting air and gas to above 1000°C, even low-calorific low-quality fuels (such as blast furnace gas) can ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/00C04B35/622C04B35/632
Inventor 高如琴朱灵峰孔晓霞程萌黄豆豆
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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