White corundum is made from industrial aluminum oxide powder, which is melted and smelted at high temperatures above 2000 ℃ in an electric arc furnace, cooled and crystallized to obtain white corundum ingots. What are its specific classifications?

1. White corundum section sand:

It refers to white alumina products with particle sizes ranging from 0-1mm, 1-3mm, 3-5mm, 5-8mm, 100 # -0, 200 # -0, 320 # -0, etc. The large blocks of white alumina produced by the smelting workshop are transported to the section sand production workshop, crushed by a coarse crusher, and then screened to obtain white alumina products with a particle size within a certain range. Mainly used for shaped refractory materials, amorphous refractory materials, and floor sand applications.

2. White corundum fine powder:

Belonging to the category of white corundum section sand, products with a particle size of 0 to a certain size in the section sand are also called fine powder. They are products that pass through fine screens in the production line of white corundum section sand. The general models are: 100 # -0, 200 # -0, 320 # -0, 0-1mm. It can be used as refractory powder for both shaped and unshaped refractory materials. At the same time, white alumina fine powder can also be further ground, processed, and screened into white alumina sand and white alumina micro powder.

3. White corundum particle size sand:

White corundum grain size sand, also known as white corundum grade sand, is mainly divided into white corundum F sand, white corundum P sand, and national standard micro powder W sand. It is a certain type of white corundum sand corresponding to the standard particle size distribution of F sand and P sand.

4. White corundum powder:

White corundum fine powder is selected from the white corundum section sand production line, further crushed and shaped through tube grinding, magnetic separation to remove iron, acid washing, and moisture. Widely used in grinding and polishing of semiconductors, crystals, circuit boards, aluminum, steel, stainless steel, stone, glass, as well as coatings, fillers, etc. Particle size specifications and composition.

Classification standards and purchasing points of white corundum products

Classification standards for white alumina products

We all know that white alumina materials have excellent properties such as high hardness, good wear resistance, thermal conductivity, and low thermal expansion coefficient. They are widely used in various tools such as sawing, grinding, cutting, and drilling, and have gradually become indispensable materials in the fields of electronics, communication, aviation, aerospace, and other technological fields.

White alumina: A high-end refractory raw material made by melting imported high-quality aluminum oxide powder at a high temperature of over 2000 degrees in an electric arc furnace and cooling it. The main crystal phase is a-alumina, with a white color. White alumina produced by a tilting electric arc furnace has the advantages of high volume density and low porosity, thereby improving the volume stability and thermal shock resistance of the material. But the amount of white corundum powder is crucial. White corundum micro powder is the most cost-effective abrasive suitable for both dry and wet production processes, especially suitable for treating rough workpiece surfaces that require finer surface finish.

Classification criteria:

1. White corundum: high-quality product 99.6% ≤ AL2O3 ≤ 99.8% Na2O<0.3%

First grade product 99.0% ≤ AL2O3 ≤ 99.5% Na2O<0.45%

6 key points to pay attention to when purchasing high-quality white corundum

1. Aluminum oxide content: The aluminum oxide content directly determines the properties of white alumina and the cost of the factory

2. Sodium content: Sodium oxide will produce sodium aluminate in white alumina smelting, which affects product quality

3. Stacking density: Stacking density can reflect particle density, particle shape, and particle size composition to a certain extent

4. Whiteness: an indicator reflecting the appearance and color of white corundum

5. Particle size distribution: Particles that are too coarse or too fine will have different effects

6. Particle shape: Different applications may use sharp, rounded, or flat particle shapes