Zirconium corundum mullite brick for hazardous waste rotary kiln and preparation method

A technology for hazardous waste and mullite bricks, which is used in rotary drum furnaces, lighting and heating equipment, furnaces, etc., can solve the problems of casting with a porosity layer, unfavorable filling, and increased air pressure, so as to reduce the porosity layer or casting. Insufficient, improve firmness, improve the effect of compactness

Pending Publication Date: 2022-04-29
江苏朗耐德耐火材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Commonly used zirconium corundum mullite bricks for hazardous waste rotary kilns are generally heated during the casting process, causing the material composition to decompose and gasify, and chemically react with the molten liquid to increase the pressure in the cavity. bad for filling
Swelling will occur in severe cases, which is caused by defects such as pore layers or insufficient casting of castings. For this reason, a zirconium corundum mullite brick for hazardous waste rotary kiln and its preparation method are proposed

Method used

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  • Zirconium corundum mullite brick for hazardous waste rotary kiln and preparation method
  • Zirconium corundum mullite brick for hazardous waste rotary kiln and preparation method
  • Zirconium corundum mullite brick for hazardous waste rotary kiln and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A zirconium corundum mullite brick for a hazardous waste rotary kiln, comprising a base brick 1, the outer edge of the base brick 1 is arranged in a stepped shape, grooves 2 are left on both sides of the surface of the base brick 1, and the bottom of the base brick 1 The bottom brick 3 is fixed, and the bottom brick 3 and the base brick 1 are integrally connected by die-casting. One side of the bottom brick 3 is provided with a slot 4, and the other side of the bottom brick 3 is fixed with a The protruding block 5 is integrally arranged between the protruding block 5 and the bottom brick 3, and the protruding block 5 is plugged into the slot 4.

[0050] A method for preparing zirconium corundum mullite bricks for hazardous waste rotary kilns, comprising the following steps;

[0051] S1, preparation before melting;

[0052] S101, adding alumina, alkali powder and zircon sand raw materials into the electric furnace;

[0053] Mix the selected zircon sand and industrial a...

Embodiment 2

[0083] The difference with Embodiment 1 is:

[0084] S101. Combine the selected zircon sand and industrial alumina powder in a weight ratio of 1:1, and add 40% Na by weight to the solid material 2 O (added in the form of sodium carbonate), B 2 o 3 (added in the form of boric acid or borax) mixed flux, mixed evenly with solid materials;

[0085] S2, melting:

[0086] S201, oxidizing and melting the raw material at high temperature;

[0087] The raw material is melted to a molten state at 1800°C in an electric furnace

[0088] S202, blowing oxygen into the melt;

[0089] After the reduction and melting of the raw materials is completed, oxygen is blown into the melt, and the trace carbon in the melt burns and escapes through contact with oxygen.

Embodiment 3

[0091] The difference with embodiment one and two is;

[0092] S101. Combine the selected zircon sand and industrial alumina powder in a weight ratio of 1:1, and add Na with a weight of 50% of the solid material 2 O (added in the form of sodium carbonate), B 2 o 3 (added in the form of boric acid or borax) mixed flux, mixed evenly with solid materials;

[0093] S2, melting:

[0094] S201, oxidizing and melting the raw material at high temperature;

[0095] The raw material is melted to a molten state at 1900°C in an electric furnace

[0096] S202, blowing oxygen into the melt;

[0097] After the reduction and melting of the raw materials is completed, oxygen is blown into the melt, and the trace carbon in the melt burns and escapes through contact with oxygen.

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Abstract

The invention relates to the technical field of fused alumina zirconia mullite bricks, and discloses a fused alumina zirconia mullite brick for a hazardous waste rotary kiln and a preparation method thereof.The preparation method comprises the steps that aluminum oxide, alkali powder, zircon sand and other raw materials are added into an electric furnace, the raw materials are subjected to high-temperature oxidation melting, oxygen is blown into melt, then the melt is directly poured into a casting mold from the electric furnace, and after casting of a casting is completed, the fused alumina zirconia mullite brick is obtained; after cold contraction for a period of time, the melt is fully cast in a shrinkage cavity, and the casting mold is cooled in advance before casting, so that the temperature difference between the casting and the casting mold is increased, the width of a solidification area of the casting from the surface to the inside is reduced, the solidification shrinkage speed of the casting is slowed down, and the possibility of hot cracking when the core part of the casting is finally solidified is reduced; meanwhile, in the casting process, the outside of the casting mold is cooled, so that the situation that the temperature of the casting mold rises, material components of the casting mold are decomposed and gasified and chemically react with molten liquid is avoided, and the possibility that a pore layer appears on a casting or insufficient casting occurs is reduced.

Description

technical field [0001] The invention relates to the technical field of zirconium corundum mullite bricks, in particular to a zirconium corundum mullite brick for a hazardous waste rotary kiln and a preparation method thereof. Background technique [0002] Zirconium corundum brick refers to a refractory product with a ZrO2 content of 33%-45% made of industrial alumina powder and selected zircon sand as raw materials. Zirconium corundum bricks are mainly used in glass industry tank kilns. Zirconium corundum bricks are also called electric fused bricks. 2 o 3 -ZrO 2 - SiO 2 The three chemical components of the ternary system phase diagram are arranged in order of their content, Al 2 o 3 Take A, ZrO 2 Take Z, SiO 2 Take S, the national standard adopts this abbreviation, for example, No. 33 fused-cast zirconia corundum brick, abbreviated as AZS-33#, No. 36 fused-cast zirconia corundum brick, abbreviated as AZS-36#, No. 41 fused-cast zirconia corundum brick, abbreviated as...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B7/20F27D1/04F27D9/00F27D25/00C04B35/66C04B35/109C04B35/185C04B35/48C04B35/622C04B35/657
CPCF27B7/20F27D25/008F27D1/04F27D9/00C04B35/66C04B35/109C04B35/48C04B35/185C04B35/622C04B35/657C04B2235/3201C04B2235/3409
Inventor 张林刘忠珍
Owner 江苏朗耐德耐火材料有限公司
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