High-wear-resistance white corundum castable

Abstract

The invention relates to a white corundum castable with high wear resistance. The white corundum castable comprises 30-45% of fused white corundum, 20-30% of tabular corundum, 3-5% of alumina powder, 5-12% of corundum powder, 6-10% of zirconite powder, 0-0.2% of explosion-proof fiber, 0-0.8% of a shrink-proof agent, 10-14% of calcium aluminate cement and 10-15% of an additive. The preparation method has the beneficial effects that the use temperature can reach 1800 DEG C, the heat-resistant strength is high, the wear resistance is good, the thermal shock resistance is excellent, and the high-temperature volume stability is good; stripping resistance, permeation resistance, corrosion resistance and acid and alkali resistance are excellent; the construction difficulty is reduced, the expansion joints are relatively simple in arrangement, and the oven baking risk is reduced. When the high-wear-resistance white corundum castable is applied to a key part of a circulating fluidized bed boiler, the service life of the high-wear-resistance white corundum castable is prolonged by 6-8 months; when the device is applied to the hazardous waste industry, parts which need to be replaced after operating for one year originally and do not need to be maintained for two years. The oven drying time is shortened by 1-2 days; and after the high-wear-resistance white corundum castable is used, the maintenance life cycle can be prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of boiler and incinerator refractory materials, and in particular relates to a highly wear-resistant white corundum castable. Background Art

[0002] In the prior art, the formula ingredients of wear-resistant corundum castables include brown corundum, fused white corundum, plate corundum, alumina powder, corundum powder, calcium aluminate cement and additives; wear-resistant corundum castables are mainly suitable for circulating fluidized bed boilers in the power industry, municipal solid waste incinerators, petrochemical converters, gasifiers, reactors and industrial hazardous waste incinerators.

[0003] At present, the industrial production market is highly competitive. Party A requires that the equipment production cycle be extended and the number of maintenance times be reduced. Correspondingly, the maintenance cycle is lengthened to reduce maintenance losses and improve equipment utilization.

[0004] However, the existing wear-resistant corundum castables have the following defects: the wear resistance of the material increases with the equipment running time; the anti-stripping performance needs to be improved; the anti-erosion and penetration performance is insufficient; the thermal expansion coefficient of the material is large during operation; the furnace baking process is risky, and there is a possibility of furnace explosion and pipe burst if it is not controlled; the construction is difficult, and the control of water quality, water quantity and water temperature is high; the material maintenance requirements are high, and it needs to be maintained in a humid environment for more than 7 days; and it gradually fails to meet the market requirements. Summary of the invention

[0005] The purpose of the invention is to overcome the deficiencies in the prior art and provide a highly wear-resistant white corundum castable.

[0006] A highly wear-resistant white corundum castable comprises, by mass fraction, 30-45% of fused white corundum, 20-30% of plate corundum, 3-5% of alumina powder, 4-12% of corundum powder, 6-10% of zircon powder, 0-0.2% of explosion-proof fiber, 0-0.8% of shrinkage-proof agent, 10-14% of calcium aluminate cement, and 10-15% of additives.

[0007] Preferably, the composition comprises, by mass fraction, 35% of fused white corundum, 25% of plate-shaped corundum, 4% of alumina powder, 5% of corundum powder, 10% of zircon powder, 0.2% of explosion-proof fiber, 0.8% of shrinkage-proof agent, 10% of calcium aluminate cement, and 10% of additives.

[0008] The beneficial effects of the present invention are:

[0009] The high wear-resistant white corundum castable provided in the present invention has an operating temperature of up to 1800°C, and has high heat resistance, good wear resistance, excellent thermal shock resistance, and good high-temperature volume stability; it also has excellent properties such as anti-stripping, anti-penetration and corrosion resistance, and acid and alkali resistance; in addition, the difficulty of construction using the high wear-resistant white corundum castable will be reduced, the expansion joint setting will be relatively simple, and the risk of furnace baking will be reduced.

[0010] High wear-resistant white corundum castables are widely used in various industries. With effective improvement of wear resistance, they are applied in key parts of circulating fluidized bed boilers. The service life of high wear-resistant white corundum castables is extended by more than 6-8 months. When applied to hazardous waste industry, due to its improved acid and alkali resistance, anti-penetration and anti-corrosion performance, parts that originally needed to be replaced after one year of operation do not need maintenance for two years. The furnace drying time is reduced by 1-2 days, reducing the furnace drying cost. After using high wear-resistant white corundum castables, the maintenance life cycle can be extended. DETAILED DESCRIPTION

[0011] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0012] Example 1

[0013] A highly wear-resistant white corundum castable comprises, by mass fraction, 30% of fused white corundum, 20% of plate corundum, 5% of alumina powder, 9% of corundum powder, 6% of zircon powder, 0.2% of explosion-proof fiber, 0.8% of shrinkage-proof agent, 14% of calcium aluminate cement and 15% of additives.

[0014] Example 2

[0015] A highly wear-resistant white corundum castable comprises, by mass fraction, 45% of fused white corundum, 20% of plate corundum, 4% of alumina powder, 4% of corundum powder, 6% of zircon powder, 0.2% of explosion-proof fiber, 0.8% of shrinkage-proof agent, 10% of calcium aluminate cement and 10% of additives.

[0016] Example 3

[0017] A highly wear-resistant white corundum castable comprises, by mass fraction, 35% of fused white corundum, 25% of plate corundum, 4% of alumina powder, 5% of corundum powder, 10% of zircon powder, 0.2% of explosion-proof fiber, 0.8% of shrinkage-proof agent, 10% of calcium aluminate cement and 10% of additives.

Claims

1. A highly wear-resistant white corundum castable, characterized in that: Calculated by mass fraction, it includes: 30-45% fused white corundum, 20-30% plate corundum, 3-5% alumina powder, 4-12% corundum powder, 6-10% zircon powder, 0-0.2% explosion-proof fiber, 0-0.8% shrinkage-proof agent, 10-14% calcium aluminate cement, and 10-15% additives.

2. The highly wear-resistant white corundum castable according to claim 1, characterized in that: Calculated by mass fraction, it includes: 35% fused white corundum, 25% plate corundum, 4% alumina powder, 5% corundum powder, 10% zircon powder, 0.2% explosion-proof fiber, 0.8% shrinkage-proof agent, 10% calcium aluminate cement, and 10% additives.