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Magnesium aluminum spinel-corundum-Sialon complex phase high-temperature resistant material and preparation method thereof

A magnesia-aluminum spinel and high-temperature-resistant technology, which is applied in the field of refractory materials, can solve the problems of secondary waste with low added value, and achieve the effect of excellent comprehensive performance and low cost

Inactive Publication Date: 2010-02-24
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to propose a kind of high-aluminum fly ash, aluminum ash and Heling Preparation of low-cost, high-performance magnesium-aluminum spinel-corundum-Sialon composite high-temperature resistant materials by in-situ thermite reduction and nitriding process using magnesium ore as raw material

Method used

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  • Magnesium aluminum spinel-corundum-Sialon complex phase high-temperature resistant material and preparation method thereof
  • Magnesium aluminum spinel-corundum-Sialon complex phase high-temperature resistant material and preparation method thereof
  • Magnesium aluminum spinel-corundum-Sialon complex phase high-temperature resistant material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] raw material:

[0023] The chemical composition of fly ash from a power plant in Shanxi is (w): Al 2 o 3 40.37%, SiO 2 52.45%, Fe 2 o 3 2.36%, CaO 0.75%, MgO 0.54%, loss on ignition 1.56%, other 1.97%, the amount added accounts for 40% of the total mass fraction of ingredients;

[0024] The chemical composition of aluminum ash from an aluminum plant in Shanghai is (w): Al 2 o 3 18.02%, AlN 14.13%, Al 28.62%, MgO7.1%, SiO 2 5.9%, Fe 2 o 3 4.0%, CaO 2.8%, Na 2 O 2.6%, TiO 2 1.6%, loss on ignition 12.8%, other 2.43%, the added amount accounts for 55% of the total ingredients mass fraction;

[0025] The chemical composition of magnesite produced in Liaoning is (w): MgO 44.66%, Al 2 o 3 0.33%, SiO 2 1.35%, CaO1.52%, Fe 2 o 3 0.51%, loss on ignition 50.40%, and the addition accounts for 5% of the total batching mass fraction.

[0026] Raw material pretreatment:

[0027] The above-mentioned raw materials are finely ground through a 200-mesh sieve by...

Embodiment 2

[0036] raw material:

[0037] Fly ash from a power plant in Beijing, its chemical composition (w): SiO 2 54.30%, Al 2 o 3 35.40%, Fe 2 o 3 1.50%, CaO 1.80%, MgO 0.70%, loss on ignition 4.30%, other 2.0%, the amount added accounts for 38% of the total mass fraction of ingredients;

[0038] The chemical composition of aluminum ash from an aluminum plant in Hebei is (w): Al 2 o 3 21.05%, AlN 11.03%, Al 29.55%, MgO12.5%, SiO 2 5.0%, Fe 2 o 3 3.8%, CaO 3.4%, Na 2 O 1.6%, TiO 2 1.2%, loss on ignition 8.77%, other 2.10%, accounting for 52% of the total mass fraction of ingredients;

[0039] The chemical composition of magnesite produced in Liaoning is (w): MgO 44.66%, Al 2 o 3 0.33%, SiO 2 1.35%, CaO1.52%, Fe 2 o 3 0.51%, loss on ignition 50.40%, and the addition accounts for 10% of the total batching mass fraction.

[0040] Raw material pretreatment:

[0041] The above-mentioned raw materials are finely ground through a 200-mesh sieve by vibrating mill, s...

Embodiment 3

[0050] raw material:

[0051] The chemical composition of fly ash from a power plant in Shanxi is (w): Al 2 o 3 40.37%, SiO 2 52.45%, Fe 2 o 3 2.36%, CaO 0.75%, MgO 0.54%, loss on ignition 1.56%, other 1.97%, the added amount accounts for 41% of the total mass fraction of ingredients;

[0052] The chemical composition of aluminum ash from an aluminum plant in Hebei is (w): Al 2 o 3 21.05%, AlN 11.03%, Al 29.55%, MgO12.5%, SiO 2 5.0%, Fe 2 o 3 3.8%, CaO 3.4%, Na2 O 1.6%, TiO 2 1.2%, loss on ignition 8.77%, other 2.10%, aluminum ash accounts for 59% of the total batching mass fraction.

[0053] The chemical composition of magnesite produced in Liaoning is (w): MgO 44.66%, Al 2 o 3 0.33%, SiO 2 1.35%, CaO1.52%, Fe 2 o 3 0.51%, loss on ignition 50.40%, and the addition accounts for 5% of the total batching mass fraction.

[0054] Raw material pretreatment:

[0055] The above-mentioned raw materials are finely ground through a 200-mesh sieve by vibrating ...

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Abstract

The invention relates to a magnesium aluminum spinel-corundum-Sialon complex phase high-temperature resistant material and a preparation method thereof, belonging to the technical field of high-temperature resistant material. The main raw materials of the complex phase high-temperature resistant material contain high-aluminum fly ash, aluminum ash and magnesite. The main raw materials are mixed according to the following percentages: 0.1% to 90% of high-aluminum fly ash, 0.1% to 99% of aluminum ash and 0.1% to 40% of magnesite. The metallic aluminum in the aluminum fly ash is used as reducingagent. The magnesium aluminum spinel-corundum-Sialon complex phase high-temperature resistant material is acquired by adding binding material for forming after ball milling and mixing with dry methodand then performing aluminothermic reduction reaction under nitrogen atmosphere at 1350 DEG C to 1700 DEG C. The prepared complex phase high-temperature resistant material of the invention has the advantages of heat-resistant property, spalling resistance property and scour erosion-resisting property. The invention can efficiently lower the cost of magnesium aluminum spinel-corundum-Sialon complexphase high-temperature resistant material and find a new way to comprehensively use high-aluminum fly ash, aluminum ash and magnesite.

Description

Technical field: [0001] The invention relates to a method for preparing magnesium-aluminum spinel-corundum-Sialon composite high-temperature-resistant materials by using high-alumina fly ash, aluminum ash and magnesite, belonging to the technical field of refractory materials. Background technique: [0002] Fly ash is a large amount of waste discharged from fluidized bed boilers in coal-fired power plants and other coal-fired industries. It is collected by dust collectors after pulverized coal is ground into a certain fineness and burned at high temperature in fluidized bed boilers. fine ash. It is an active substance whose main chemical composition is silicon dioxide (SiO 2 ), aluminum oxide (Al 2 o 3 ), a small amount of iron oxide (Fe 2 o 3 ) and calcium oxide (CaO) (when coal is burned without calcium-containing desulfurizer). Of which SiO 2 and Al 2 o 3 The content is the highest, and the sum of the two generally accounts for more than 60%. It is the main activ...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/622
Inventor 黄军同黄朝晖刘艳改房明浩董锦芳黄赛芳
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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