The higher the whiteness of alumina, the higher the purity and quality?

Time:

2023-05-31

Alumina is widely used in new ceramic materials and industrial production. Alumina is a stable oxide of aluminum with the chemical formula Al2O3. It is also known as bauxite in mining, ceramics and material science. Alumina contains elemental aluminum and oxygen. If the bauxite raw material is chemically treated to remove oxides such as silicon, iron, and titanium, the product obtained is a high-purity alumina raw material, and the Al2O3 content is generally above 99%. The mineral phase is composed of 40% to 76% γ-Al2O3 and 24% to 60% α-Al2O3. γ-Al2O3 can be converted into α-Al2O3 at 950~ 1200 ℃, and significant volume shrinkage occurs at the same time. Good products can help improve production efficiency. Therefore, when choosing products, we must carefully control the quality to prevent quality problems during use and cause no effect.

⇒ The purity of alumina powder should be high and the oxides of elements such as silicon and iron should be as low as possible. To ensure its purity and whiteness, the higher the purity, the higher the whiteness.

⇒ The content of heavy metal elements that are harmful to the human body should be strictly required. Radiation is a very large measure.

⇒ The whiteness of alumina should be as high as possible. Whether it is alumina or molecular sieve, the whiteness mainly depends on the raw material. For new ceramic materials, the whiteness does not affect the mechanical properties and processing properties of the material, but the whiteness is high and gives people a good feeling, and the whiteness with the same performance has more competitive advantages.

⇒ The lower the oil absorption rate, the better. The specific surface area directly determines the oil absorption rate, and the firing temperature determines the specific surface area. The higher the firing temperature, the smaller the specific surface area, and the lower the oil absorption rate. Special industries need to use products with lower oil absorption. At this time, surface activation treatment is required and processed into activated alumina to meet customer requirements.

⇒ The fineness should be appropriate, not the finer the better, and the particle size distribution should also be determined as needed.

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