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White Corundum for Refractories

High-purity white fused alumina designed for abrasives and refractories, offering exceptional hardness, thermal stability, and chemical resistance, making it ideal for demanding industrial applications.

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White Corundum(WFA) is a high-purity synthetic material produced by the fusion of high-grade alumina in an electric arc furnace. With a purity of over 99% aluminum oxide (Al₂O₃), it exhibits exceptional hardness, high thermal stability, and resistance to chemical corrosion. Its uniform particle size distribution and angular structure make it ideal for precision abrasive applications. Additionally, its iron-free and low-sodium composition ensures minimal contamination, providing excellent performance in high-demand environments.

White corundum is manufactured through a meticulous process:

 1. High-purity alumina is melted at a temperature exceeding 2000°C in an electric arc furnace.

 2. The molten material is cooled, crystallized, and then crushed into a fine powder.

 3. Advanced sieving and magnetic separation techniques are employed to remove impurities and achieve the desired grain sizes.

 4. The final product undergoes rigorous quality testing to ensure consistency and compliance with industry standards.

For Refractories Application

White corundum is widely used in the production of advanced refractory materials due to its high melting point and excellent thermal conductivity. Key applications include:

 • Castables and Monolithics: Enhances strength and resistance to thermal shock in high-temperature linings.

 • Refractory Bricks: Provides durability and stability in furnaces, kilns, and reactors.

 • Slide Gates and Nozzles: Offers wear resistance and longevity in steel-making processes.

Its purity and thermal stability make it indispensable in environments requiring consistent performance under extreme conditions.

Specification

White Fused Alumina Chemical Composition Analysis

Chemical Component Content (%) Remarks
Al₂O₃ 99.5 – 99.9 High purity
Na₂O 0.1 – 0.3 Controlled impurity
Fe₂O₃ 0.02 – 0.05 Low iron content
SiO₂ 0.02 – 0.04 Minimal silica
CaO 0.02 – 0.05 Trace calcium

 

Certificate of Analysis

1. Introduction

This report provides an analysis of White Fused Alumina (WFA) for refractory applications. White Fused Alumina is a high-purity synthetic material produced by fusing calcined alumina in electric arc furnaces. It is widely used in the refractory industry due to its exceptional chemical purity, high melting point, and superior thermal resistance.

2. Test Methods

The following tests were conducted according to international standards such as ISO 12677:2022 and ASTM C704-15:

– Chemical Composition Analysis

– Bulk Density and Apparent Porosity Testing

– Thermal Shock Resistance

– Grain Size Distribution Analysis

3. Chemical Composition

The chemical composition of the tested sample is as follows:

Component Content (%)
Al₂O₃ 99.6
Na₂O 0.18
SiO₂ 0.05
Fe₂O₃ 0.03

4. Physical Properties

The physical properties of White Fused Alumina are as follows:

Property Value
Bulk Density (g/cm³) 3.95
Apparent Porosity (%) 3.0
Thermal Shock Resistance (Cycles at 1000°C) 30

5. Grain Size Distribution

The grain size distribution was analyzed, and the results are summarized below:

Grain Size (µm) Percentage Passing (%) Standard Deviation
< 53 99.0 ±0.3
53-150 85.0 ±1.0
> 150 12.0 ±0.8

6. Conclusion

The tested White Fused Alumina shows exceptional properties ideal for refractory applications. Its high alumina content, minimal impurities, and robust physical properties ensure reliable performance in demanding high-temperature environments.

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