Home > FAQ > What is White Fused Alumina? A Complete Introduction

What is White Fused Alumina? A Complete Introduction

White Fused Alumina

White Fused Alumina is a white man-made corundum that, like natural corundum gemstones, has high hardness, high temperature resistance, chemical stability and purity. With a Mohs hardness of 9, second only to diamond, a maximum use temperature close to 2000°C, and an Al2O3 content greater than 99%, these excellent material properties make White Fused Alumina more and more widely used in industrial production today.

White Fused Alumina is made from industrial alumina powder, which is smelted in an electric arc furnace at a temperature of over 2000°C and cooled and crystallized to obtain White Fused Alumina frit.

White Fused Alumina and industrial alumina powder also contain alumina, so why do we need to do this extra work for smelting?

This is because the many excellent characteristics of White Fused Alumina come from its α-Al2O3 crystals, while the alumina content of industrial alumina powder is only about 98%, which not only contains other impurities, but also contains Al2O3 isomers, which can significantly reduce the various properties of corundum materials. Therefore, it is necessary to remove impurities by melting, purify the alumina content, and form α-Al2O3 crystals by re-crystallization.

Classification of White Fused Alumina

The melting and cooling process results in several tons of corundum lumps, which cannot be used directly in industrial production, so they need to be processed and crushed into different sizes to suit various applications.

The classification of White Fused Alumina according to particle size mainly includes:

  1. White Fused Alumina segmental sand (White Fused Alumina sand within two particle sizes).
  2. White Fused Alumina particle size sand (corresponding to the standard requirements of the model).
  3. White Fused Alumina fine powder (fine segmental sand that completely passes through a certain screen).
  4. White Fused Alumina micro powder (superfine powder with a general particle size of less than 60 microns).

White Fused Alumina smelting

White Fused Alumina segment sand

White Fused Alumina segmental sand: it is White Fused Alumina product with particle size range of 0-1mm, 1-3mm, 3-5mm, 5-8mm, 100#-0, 200#-0, 320#-0, etc. It is transported from the smelting workshop to the section sand production workshop with high quality White Fused Alumina boulders, crushed by the coarse breaker and then sieved to finally get White Fused Alumina products with particle size in a certain range. It is mainly used as shaped refractory material, unshaped refractory material and flooring sand.

White Fused Alumina fine powder

White Fused Alumina fine powder: It belongs to White Fused Alumina section sand, the product of 0 to a certain particle size in section sand is also called fine powder, it is the product that passes the finest sieve in White Fused Alumina section sand production line, the general models are: 100#-0, 200#-0, 320#-0, 0-1mm, it can be used as high quality refractory powder for shaped refractories and unshaped refractories. Also White Fused Alumina fine powder can be further ground, processed and sieved into White Fused Alumina number sand and White Fused Alumina micro powder.

White corundum grain size sand
White corundum grain size sand

White Fused Alumina particle size sand

White Fused Alumina particle size sand, also called White Fused Alumina number sand, is mainly divided into White Fused Alumina F sand and White Fused Alumina P sand and national standard micronized powder W number. It is a certain type of White Fused Alumina sand corresponding to the standard particle size distribution of F sand and P sand. Mainly contains

White Fused Alumina F sand: F4, F5, F6, F7, F8, F10, F12, F14, F16, F20, F22, F24, F30, F36, F40, F46, F54, F60, F70, F80, F90, F100, F120, F150, F180, F220, F230, F240, F280, F320, F360、F400、F500、F600、F800、F1000、F1200

White Fused Alumina P sand: p240, p280, p320, p360, p400, p500, p600, p800, p1000, p1200, p1500, p2000, p2500

White Fused Alumina micro powder

White Fused Alumina micronized powder is selected from high quality White Fused Alumina fine powder in White Fused Alumina section sand production line, further crushed and shaped by tube mill, magnetic separation to remove iron, acid washing and moisture. It is widely used in grinding and polishing of semiconductors, crystals, circuit boards, aluminum, steel, stainless steel, stone, glass, etc. as well as coatings, fillers, etc.

White corundum powder
White corundum powder

Size specification and composition

Japanese standard: 240#, 280#, 320#, 360#, 400#, 500#, 600#, 700#, 800#, 1000#, 1200#, 1500#, 2000#, 2500#, 3000#, 3500#, 4000#, 6000#, 8000#

European Standard: F240, F280, F320, F360, F400, F500, F600, F800, F1000, F1200, F1500

National standard: W63, W50, W40, W28, W20, W14, W10, W7, W5, W3.5

White Fused Alumina need to pay attention to the following points

Alumina content: Alumina content directly determines the nature of White Fused Alumina and the cost of the plant.

Sodium content: sodium oxide will produce high sodium aluminate in White Fused Alumina smelting, which affects the product quality.

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

Whiteness: the index of reflecting the appearance and color of White Fused Alumina.

Particle size distribution: too coarse or too fine particles will have different effects.

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

Applications in the white corundum industry

  • Polishing and Grinding
  • Refractory materials
  • Sandblasting
  • Precision Casting
  • Coated Abrasives
  • Curing Abrasives

White corundum life applications

  • White grinding wheel, gauze
  • White sharpening stone
  • Wear layer of laminate wood flooring
  • Sanding and polishing wax
  • Sapphire screen
  • Artificial corundum stones
  • Sandblasting of porcelain teeth

white fused alumina manufacturer

Henan Superior Abrasives is a manufacturer in China that provide concrete additive, abrasives, our main product include densified silica fume, undensified silica fume, black silicon carbide, green silicon carbide, white fused alumina, brown fused alumina etc.

If you are interested in our products, please leave a message or contact us through the contact information below.

Email: sales@superior-abrasives.com

WhatsApp: +86-15981847002

Related Posts

Request a Quote

All information provided will be kept confidential.
Interested in our products? Please send your inquiry in the form below: