Brown corundum, commonly known as corundum, is a brown artificial corundum obtained by melting and restoring alumina, carbon materials, and iron filings in an electric furnace, so it is called brown corundum. The main chemical composition of brown fused alumina is AL2O3, its content is 94.5% to 97%, and it is also rich in a small amount of Fe, Si, Ti, etc.
Brown fused alumina is mainly divided into three grades, the best of which is first-grade brown fused alumina, followed by second-grade and third-grade brown fused alumina. It is what we often call No. 95 brown corundum. The content of secondary brown fused alumina and tertiary brown fused alumina decreases step by step, and the quality also decreases.
1. Check whether the color is brownish yellow.
The color of brown corundum is usually brown and translucent. The color of brown corundum with high aluminum content is lighter, which is shiny brown. It has high transparency under the sun. If compared, the color The deep brown corundum with a little cyan color has high hardness, high wear resistance and high iron content. If the particles of brown corundum are small, the color will appear light, and if the particles are large, the color will be dark. The materials are all the same. The depth of the color is closely related to the particle size.
2. Is the color consistent?
The fineness of brown corundum can be distinguished by looking at the color, because brown corundum is rich in Fe (iron) elements, and the Fe element is reddish brown, so brown corundum appears brown, and brown corundum can be distinguished by looking at the color. Corundum grades and qualities.
3. The content of alumina
is mainly divided into three grades, the best of which is the first grade of brown fused alumina, followed by the second and third grades, which are the quality standards of brown fused alumina. It mainly depends on the content of AL2O3. The first-grade brown fused alumina with a content of more than 95% is the best one, which is often referred to as No. 95 brown fused alumina. The content of the second-grade brown fused alumina decreases step by step with the content of the third-grade brown fused alumina, and the quality also decreases gradually. The quality of brown corundum can be judged from the color, because brown corundum contains Fe (iron) element. The Fe element is reddish brown, so brown corundum appears brown, and the grade and quality of brown corundum can be identified by looking at the color.
4. Look at the craft
Brown corundum particle size sand is made of manually selected brown corundum blocks, which are processed by rollers, ball mills, Barmac and other equipment. The particle size is from F8-F325. It is mainly used for polishing, grinding, industrial grinding, etc. Washing, pickling and other methods of processing can meet different needs.
The above is the method to identify brown fused alumina. The price of brown fused alumina is relatively expensive, but there will always be some people in the market who use garnet sand to shoddy it, so we need to know more about brown fused alumina. Only in this way can we choose a better one. High quality brown corundum!