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Anti-wetting quick repair castable and preparation method thereof

A castable, fast technology, applied in the field of refractory castables, can solve the problems of long oven cycle of castables, unsatisfactory, blackened furnace lining, etc., to shorten demoulding time and baking time, improve maintenance efficiency, and good durability The effect of the high temperature effect

Pending Publication Date: 2019-02-22
ZHEJIANG INSERTEC FOUNDRY SUPPLIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Traditionally, refractory castables generally use calcium aluminate cement as a binder, which has the characteristics of high early strength, high refractoriness, and strong slag resistance. It is an ideal binder for unshaped refractories and is widely used in metallurgy, building materials, Petroleum, chemical and other industrial kilns; but the hydration reaction process of calcium aluminate cement is complicated and takes a long time. After the calcium aluminate cement combined with refractory castables is poured, it needs to be cured for 24 to 48 hours before the formwork can be removed. In addition, The baking time of calcium aluminate cement combined with refractory castables is too long, usually 20-30 days, and the winter time is longer, which cannot meet some tight construction schedules, rapid thermal repair of small-area furnace linings, and repairs without furnace shutdown and cold repair conditions
[0003] Later, the applicant improved the castable and invented a castable with the application number 201610145233.X and the name is anti-infiltration of aluminum liquid. Although the use temperature and anti-infiltration effect have been improved, barium salt and aluminum are still used. Calcium acid cement is used as a raw material. On the one hand, the limitations of barium salt itself make it impossible to withstand a maximum operating temperature of more than 1200°C. If the operating temperature is exceeded, the infiltration resistance will fail, and the molten aluminum will penetrate into the furnace lining, and then react, causing the furnace lining to be damaged. Blackening and swelling can accelerate the actual effect of the furnace lining. On the other hand, calcium aluminate cement is still used as the binder, and the hydration reaction is greatly affected by temperature. It needs to be cured for at least 24 hours before demoulding. In addition, in order to remove water The free water outside the chemical reaction, the castable oven cycle is long

Method used

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Experimental program
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Effect test

Embodiment 1

[0017] The anti-wetting quick repair castable of the present embodiment, its raw material components and the proportioning of each component are: 65 parts of bauxite particles, 10 parts of bauxite fine powder, 5 parts of alumina powder, 5 parts of P O As additives, wherein , the composition of bauxite particles and bauxite fine powder contains 80% Al2O3, 8% SiO2, 1.5% Fe2O3, 2.5% TiO2, 0.3% CaO and 0.1 MgO, and the remaining impurities, that is, alum The composition of soil particles and bauxite fine powder is consistent, the difference is that the size of the particle size is different, the composition of said alumina powder is mainly 95% AlO and remaining impurities, it should be noted that the formula of the present embodiment does not Contains barium salt and calcium aluminate cement. During the preparation process, the above raw material ratio is sampled, the hopper is fed to the belt scale for weight recording, and then the weighed raw materials are transferred to the mix...

Embodiment 2

[0019] The anti-wetting quick repair castable of this embodiment, its raw material components and the proportioning of each component are: 68 parts of bauxite particles, 12 parts of bauxite fine powder, 8 parts of alumina powder, 7 parts of P2O5 phosphate as additives , wherein, the composition of bauxite particles and bauxite fine powder contains 85%% of Al2O3, 10% of SiO2, 1.65% of Fe2O3, 2.8% of TiO2, 0.45% of CaO and 0.2 of MgO, and the rest are other Impurities, that is to say that the composition of bauxite particles and bauxite fine powder are the same, the difference is that the particle size is different, the composition of said alumina powder is mainly 98% Al2O3 and the remaining impurities, it should be noted that this The formula in the embodiment does not contain barium salt and calcium aluminate cement. During the preparation process, the above-mentioned raw material ratio is sampled, the hopper is fed to the belt scale for weight recording, and then the weighed r...

Embodiment 3

[0021] The anti-wetting quick repair castable of the present embodiment, its raw material components and the proportioning of each component are: 70 parts of bauxite particles, 15 parts of bauxite fine powder, 10 parts of alumina powder, 10 parts of P2O5 as additives, wherein , the composition of bauxite particles and bauxite fine powder contains 90% Al2O3, 12% SiO2, 1.8% Fe2O3, 3% TiO2, 0.5% CaO and 0.3 MgO, and the rest are other impurities, that is Said that the composition of bauxite particles and bauxite fine powder is consistent, the difference is that the size of the particle size is different, the composition of said alumina powder is mainly 99% AlO and remaining impurities, it should be noted that the present embodiment (this The formula of invention) does not contain barium salt and calcium aluminate cement. During the preparation process, the above raw material ratio is sampled, the hopper is fed to the belt scale for weight recording, and then the weighed raw materi...

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Abstract

The invention discloses an anti-wetting quick repair castable and a preparation method thereof. The castable includes the following raw materials by parts: 65-70 parts of alumina particles, 10-15 parts of alumina fine powder, 5-10 parts of alumina powder and 5-10 parts of additive. The castable has the advantage that the alumina particles and the finely divided compound alumina powder are adopted,especially a special phosphate is adopted as the additive, the formula does not contain barium salt and calcium aluminate cement, not only good high temperature resistance is achieved, excellent anti-wetting property can be ensured under the high temperature of 1600 DEG C, and the excellent interface compatibility is firmly combined with an original lining (a material to be repaired). The material is not infiltrated by molten aluminum, and the convenience is greatly improved. More importantly, the material hardening speed is very high, the demolding time and the baking time are significantlyreduced, the maintenance time is reduced, and the maintenance efficiency is improved.

Description

technical field [0001] The invention relates to a refractory castable, in particular to an anti-wetting quick repair castable and a preparation method thereof. Background technique [0002] Traditionally, refractory castables generally use calcium aluminate cement as a binder, which has the characteristics of high early strength, high refractoriness, and strong slag resistance. It is an ideal binder for unshaped refractories and is widely used in metallurgy, building materials, Petroleum, chemical and other industrial kilns; but the hydration reaction process of calcium aluminate cement is complicated and takes a long time. After the calcium aluminate cement combined with refractory castables is poured, it needs to be cured for 24 to 48 hours before the formwork can be removed. In addition, The baking time of calcium aluminate cement combined with refractory castables is too long, usually 20-30 days, and the winter time is longer, which cannot meet some tight construction sc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/101
CPCC04B35/101C04B2235/3232C04B2235/3206C04B2235/3208C04B2235/3272C04B2235/34C04B2235/3418C04B2235/9676
Inventor 徐珊徐莹杨艳辉丁书平
Owner ZHEJIANG INSERTEC FOUNDRY SUPPLIES