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Rare earth reinforced corundum silicon carbide castable and preparation method thereof

A corundum silicon carbide and castable technology, which is applied in the field of corundum silicon carbide castables for waste incinerators, can solve the problems of incinerator shutdown and maintenance, decrease in castable strength, unstable garbage composition, etc., so as to avoid secondary pollution and improve usage. Effects of longevity, good thermal shock stability and oxidation resistance

Inactive Publication Date: 2016-09-07
江苏森鑫联科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The use conditions in the garbage incinerator are extremely harsh, and the composition of the garbage is very unstable. The garbage incinerator is prone to produce dioxins outside 850-900 °C, and the corrosion ability is very strong. The rubbish rubs against the surface of the castable during the movement. , it is very easy to cause physical damage, and the wear resistance of the refractory material must be very strong. At present, most of the castables on the market are cement-bonded, and the main material is corundum mullite, or corundum silicon carbide. Since cement is very easy to react with hydrochloric acid, As a result, the strength of the castable is seriously reduced during the erosion process, and it will fall off quickly under the impact of the garbage, resulting in the shutdown of the incinerator for maintenance, a waste of manpower and material resources, and serious pollution; at the same time, most of the existing mainstream products will add chromium oxide. will produce secondary pollution

Method used

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  • Rare earth reinforced corundum silicon carbide castable and preparation method thereof
  • Rare earth reinforced corundum silicon carbide castable and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] A rare earth reinforced corundum silicon carbide castable, including the following components in weight percentage: 65% corundum aggregate, 15% silicon carbide, 5% rare earth oxide, 5% metal silicon, 10% binder and 5% admixture, Wherein the binding agent includes the weight percent: 5% α-Al 2 o 3 Micropowder, 6% pure calcium aluminate cement and 2% silica micropowder, pure calcium aluminate cement also can replace with common cement in other embodiments; α-Al 2 o 3 The particle size of the micropowder is below 2 μm.

[0021] Preferably, the rare earth oxides include 0.5% by weight of La 2 o 3 and Y 2 O.

[0022] Preferably, the silicon carbide comprises a percentage by weight of: 50% of silicon carbide with a particle size of less than 0.088mm and 50% of silicon carbide with a particle size of less than 0.5mm; wherein the silicon carbide with a particle size of less than 0.5mm contains silicon carbide with a particle size of less than 0.088mm The content is less ...

Embodiment 2

[0028] A rare earth reinforced corundum silicon carbide castable, including the following components in weight percentage: 75% of corundum aggregate, 10% of silicon carbide, 2% of rare earth oxide, 7% of metal silicon, 8% of binder and 7% of admixture, Wherein the binding agent includes: 2% α-Al2O3 micropowder, 5% pure calcium aluminate cement and 1% silica micropowder in weight percent, and the pure calcium aluminate cement can also be replaced by ordinary cement in other embodiments.

[0029] Preferably, the rare earth oxides include 1% by weight of La 2 o 3 and Y 2 O.

[0030] Preferably, the silicon carbide comprises a percentage by weight of: 55% of silicon carbide with a particle size of less than 0.088mm and 45% of silicon carbide with a particle size of less than 0.5mm; wherein the silicon carbide with a particle size of less than 0.5mm contains silicon carbide with a particle size of less than 0.088mm The content is less than 20%.

[0031] Preferably, α-Al 2 o 3...

Embodiment 3

[0036] A rare earth reinforced corundum silicon carbide castable, comprising the following components in weight percentage: 70% of corundum aggregate, 11% of silicon carbide, 4% of rare earth oxide, 3% of metal silicon, 12% of binder and 6% of admixture, Wherein the binding agent comprises: 5% α-Al2O3 micropowder, 4% pure calcium aluminate cement and 3% silica micropowder in weight percent, and the pure calcium aluminate cement can also be replaced by ordinary cement in other embodiments.

[0037] Preferably, the rare earth oxides include 2.5% by weight of La 2 o 3 and 1.5% of Y 2 O.

[0038] Preferably, the silicon carbide includes a percentage by weight of: 60% of silicon carbide with a particle size of less than 0.088mm and 40% of silicon carbide with a particle size of less than 0.5mm; wherein the silicon carbide with a particle size of less than 0.5mm contains silicon carbide with a particle size of less than 0.088mm The content is less than 20%.

[0039] Preferably, ...

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Abstract

The invention relates to a rare earth reinforced corundum silicon carbide castable and a preparation method thereof. The rare earth reinforced corundum silicon carbide castable comprises, by weight, 55-75% of corundum aggregates, 10-15% of silicon carbide, 2-5% of rare earth oxides, 1-5% of metallic silicon, 6-12% of binder and 5-7% of an additive; and the rare earth oxides include La2O3 and Y2O3. The rare earth oxides containing La2O3 and Y2O have a strong bonding performance to form microstructure welding, have a synchronous enhancement function, have good thermal shock stability and oxidation resistance, and react at a high temperature to generate LaOF, so the slag erosion resistance is improved; and the rare earth oxides have good acid and alkali resistance, and strong erosion resistance, so the service life is prolonged. Compared with the prior art adopting chromium oxide, the preparation method adopting the rare earth oxides has the advantages of prolongation of the service life, and avoiding of secondary pollution.

Description

technical field [0001] The invention relates to a corundum silicon carbide castable for garbage incinerators, in particular to a rare earth reinforced corundum silicon carbide castable and a preparation method thereof. Background technique [0002] The use conditions in the waste incinerator are extremely harsh, and the composition of the waste is very unstable. The waste incinerator is prone to produce dioxins outside 850-900 ° C, and the corrosion is strong. The waste rubs against the surface of the castable during movement. , it is very easy to cause physical damage, and the wear resistance of the refractory material must be very strong. At present, most of the castables on the market are cement-bonded, and the main material is corundum mullite, or corundum silicon carbide. Since cement is very easy to react with hydrochloric acid, As a result, the strength of the castable is severely reduced during the erosion process, and it will fall off quickly under the impact of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/10C04B35/622
CPCC04B35/103C04B35/622C04B2235/3217C04B2235/3222C04B2235/3225C04B2235/3227C04B2235/3418C04B2235/3826C04B2235/402C04B2235/428C04B2235/48C04B2235/5208
Inventor 刘卫新高奎东吕兴会
Owner 江苏森鑫联科技有限公司
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