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Ceramic combined hercynite kilneye castable and preparation method thereof

An iron-aluminum spinel and ceramic combination technology, applied in the field of refractory materials, can solve the problems of prone to volume expansion and short service life, and achieve the effects of reducing internal stress, reducing cracking and peeling, and maintaining a stable overall structure

Active Publication Date: 2022-05-31
ZHEJIANG KINGCRED NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is to overcome the short service life of the magnesia-alumina spinel castable in the prior art and the defects that volume expansion is prone to occur during use, and provides A ceramic-bonded iron-aluminum spinel kiln mouth castable and its preparation method are used to overcome the above-mentioned defects

Method used

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  • Ceramic combined hercynite kilneye castable and preparation method thereof

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preparation example Construction

[0039] The preparation method of porous silicon aluminum ceramic among the present invention is as follows:

[0040] Preparation of Porous Si-Al Ceramics (A1):

[0041] (1) Dissolve 80g of tetraethoxysilane and 1g of boric acid in 100g of water, add 5ml of glacial acetic acid, and hydrolyze at 30°C for 3 hours to obtain silica sol;

[0042] (2) Add 70g of alumina micropowder and 15g of starch to the above silica sol, and mix well to obtain a pasty mixture;

[0043] (3) Mold the pasty mixture into spherical particles with a diameter of 3-5 mm, and air-dry to obtain blanks;

[0044] (4) The blank was first sintered at 800°C for 5 hours, and then under the protection of nitrogen, the temperature was raised to 1450°C and kept for 4 hours to complete ceramicization, and porous silicon-aluminum ceramics (A1) were obtained.

[0045] Preparation of Porous Si-Al Ceramics (A2):

[0046] (1) Dissolve 80g of tetraethoxysilane and 1g of boric acid in 100g of water, add 5ml of glacial ac...

Embodiment 1

[0071] A pottery-bonded iron-aluminum spinel kiln mouth castable, said castable in parts by weight, comprising: 45 parts of iron-aluminum spinel, 20 parts of porous silicon-aluminum ceramics (A1), 18 parts of alumina micropowder, 10 parts of silicon carbide powder, 6 parts of metal silicon powder, 2.5 parts of flake graphite powder, 0.5 parts of boric anhydride and 3 parts of silica sol.

[0072] The silica sol is obtained by dissolving 50 g of tetraethoxysilane in 100 g of water and hydrolyzing it at 30° C. for 3 hours, the same below.

[0073] The preparation process of the castable is as follows, dissolving boric anhydride and silica sol in 5 parts of water to form a binder solution, and then spraying the binder solution evenly on the surface of the porous silicon-aluminum ceramic, adding powder, mixing evenly, and then adding iron The alumina spinel is continuously mixed evenly to obtain the kiln mouth castable, the same below.

Embodiment 2

[0075] A pottery-bonded iron-aluminum spinel kiln mouth castable, said castable in parts by weight, comprising: 45 parts of iron-aluminum spinel, 25 parts of porous silicon-aluminum ceramics (A1), 18 parts of alumina micropowder, 10 parts of silicon carbide powder, 6 parts of metal silicon powder, 2.5 parts of flake graphite powder, 0.5 parts of boric anhydride and 3 parts of silica sol.

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Abstract

The invention relates to the field of refractory materials, in particular to a ceramic bonded hercynite kilneye castable which comprises the following components in parts by weight: 60-80 parts of aggregate, 30-45 parts of powder and 3-8 parts of a binding agent, wherein the aggregate comprises hercynite and porous silicon-aluminum ceramic, and the porous silicon-aluminum ceramic is obtained by sintering silicon dioxide, aluminum oxide and boron oxide. According to the ceramic combined hercynite kilneye castable, the compactness of the castable after casting molding can be effectively improved through reasonable configuration of the aggregate and the powder, meanwhile, the silicon-aluminum ceramic is of a porous structure, and therefore in the sintering process of all the components of the castable, the ceramic combined hercynite can be effectively prevented from being damaged, and the service life of the ceramic combined hercynite kilneye castable is prolonged. And pores in the silicon-aluminum ceramic can absorb volume expansion generated in the fusion process of all the components, so that the internal stress of the sintered castable is reduced, and the defects of cracking and stripping are reduced. The castable not only has good compactness after being sintered, but also can release internal stress, so that the overall structure is more stable.

Description

technical field [0001] The invention relates to the field of refractory materials, in particular to a ceramic-bonded iron-aluminum spinel kiln mouth castable and a preparation method thereof. Background technique [0002] The special refractory castable for the kiln mouth refers to the refractory material selected for the special position of the kiln mouth and the chain belt of the wet kiln. In particular, the refractory lining at the front kiln mouth is used at a temperature of about 1100°C. It needs to withstand rapid cooling, rapid hot airflow impact, high-temperature cement clinker wear and high-temperature harmful gas alkali corrosion, etc., and the service conditions are very harsh. [0003] At present, the castables for cement kiln usually use magnesia-alumina spinel as aggregate, but magnesia-alumina spinel usually contains a certain amount of free magnesia or alumina, which will further form spinel structure under high temperature, which has Contributes to the impr...

Claims

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Application Information

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IPC IPC(8): C04B35/66C04B35/44C04B38/06C04B35/185
CPCC04B35/66C04B35/44C04B38/0645C04B35/185C04B2235/3418C04B2235/3217C04B2235/3409C04B2235/3222C04B2235/3826C04B2235/428C04B2235/425C04B2235/96C04B2235/9607Y02P40/60
Inventor 朱国平王立旺王琪朱玉萍李新明彭晶晶方利华
Owner ZHEJIANG KINGCRED NEW MATERIAL CO LTD
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