White Fused Alumina
White fused alumina is a high-purity, synthetic abrasive material made from aluminum oxide. It is produced through the same basic process as brown fused alumina, but with certain variations in raw materials and processing steps that result in a higher level of purity and a unique crystalline structure. This makes white fused alumina particularly suitable for applications where a clean, high-quality abrasive is required.
- Product Introduction
What is White Fused Alumina
White fused alumina is a high-purity, synthetic abrasive material made from aluminum oxide. It is produced through the same basic process as brown fused alumina, but with certain variations in raw materials and processing steps that result in a higher level of purity and a unique crystalline structure. This makes white fused alumina particularly suitable for applications where a clean, high-quality abrasive is required.
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High temperature resistence
Moderate toughness
Good self-sharpening
High degree of purity
The Advantages of White Fused Alumina in Industrial Application
High purity
White fused alumina is made from high-quality aluminum oxide, resulting in a product with very low impurities, making it ideal for applications where purity is critical.
Hardness
It is known for its high Mohs hardness, making it suitable for abrasive applications that require cutting, grinding, or polishing hard materials.
Abrasive properties
White fused alumina offers excellent abrasive properties, with sharp and durable grains, making it effective for metal, ceramic, and glass grinding and polishing.
High melting point
It has a high melting point, which makes it resistant to high-temperature applications such as refractories and ceramics.
Thermal stability
It exhibits excellent thermal stability and can withstand high-temperature processes without significant deterioration.
Electrical insulation
It has good electrical insulating properties, making it useful for applications in the electrical industry.
Low friability
White fused alumina has low friability, which means the grains maintain their sharp edges and cutting efficiency for a longer time.
Controlled particle size
It can be manufactured in various particle sizes to suit different abrasive and industrial applications.
The Difference Between Brown Fused Alumina And White Fused Alumina
Different raw materials
The raw material of brown corundum is bauxite, in addition to anthracite and iron filings. The raw material of white corundum is alumina powder.
Different uses
Brown corundum can be used to make ceramics, resin high-consolidation abrasive tools, grinding, polishing, sandblasting, precision casting, etc. It can also be used to make advanced refractory materials. White corundum is suitable for grinding fine-grained abrasives such as high-carbon steel, high-speed steel and stainless steel. It can also be used for precision casting and advanced refractory materials.
Different alumina content
The alumina content of brown corundum is 94%-75%. The alumina content of white corundum is greater than 99.2%.
Different hardness
The former has a hardness of 8.9, which can be used to remove burrs on the surface of hardware parts such as stainless steel, carbon steel, aluminum alloy, etc.; the latter has a hardness of 9.0, which has a strong cutting force and is used to remove metal or non-metal burrs. Pi Feng, etc., have a polishing effect on the surface of parts, and it is a medium polishing abrasive.
Application of White Fused Alumina
Precision grinding
White fused alumina is commonly used in precision grinding applications for cutting and shaping various materials, including metals, ceramics, and glass. It provides a clean and precise finish.
Lapping and polishing
It is used for lapping and polishing operations in industries such as optics, electronics, and the production of semiconductor components, where a high-quality, scratch-free finish is essential.
Abrasive blasting
White fused alumina is utilized in abrasive blasting for cleaning and preparing surfaces in applications such as aerospace, automotive, and metal fabrication. Its high purity reduces the risk of contamination.
Refractories
It is used as a raw material in the production of high-quality refractory bricks and shapes due to its high-temperature resistance and purity.
Ceramic and composite materials
White fused alumina is often used as a reinforcement material in the production of advanced ceramics, composites, and abrasion-resistant coatings.
Wet and dry blasting
It is suitable for both wet and dry blasting operations, offering versatility in surface preparation and cleaning applications.
Jewelry and gem cutting
In the jewelry and gemstone industry, white fused alumina is used for cutting, shaping, and polishing precious stones due to its precision and lack of color contamination.
White Fused Alumina Manufacturing Process
Preparation before opening the furnace
Connect the electrode: Blow the contact surface and tighten the thread.
Adjust the length of the electrode: The electrode is just in contact with the arcing coke, which will not affect the in and out of the furnace or tipping.
Measure the electrode distance and the distance between the electrode and the furnace wall.
Measure the insulation of the secondary conductive system: The resistance value of the insulation part>0.5MΩ.
Inspect system equipment such as furnace body transmission, electrode lifting, and feeding, as well as water, air pipes, valves, etc.
Opening the furnace
Place the arcing coke: The particle size of the arcing coke is 30-50mm. There are three ways to place it:
Solid triangle: large amount of starting coke, not easy to break the arc, use in the middle.
Hollow triangle: Small amount of starting coke, easy to break the arc, not commonly used.
Crystal shape: Small amount of arc starting coke, fast arc starting, easy to break the arc, used for furnace opening.
Power transmission
Arc starting: When the current rises to 20-30%, increase the bauxite arc pressure, and when the current load rises to 80%, the material can be added into the smelting.
Smelting
It is mainly divided into two processes the furnace method and the open furnace method (see the third point of the brown corundum smelting process methods and characteristics) for "control" operation and furnace condition analysis.
Control
Generally stop feeding, control the electrode to rise, and do not deal with small reactions. The resulting reaction block or "sniff block" post-processing. To prevent the phenomenon of suspension.
Refining
Before transferring to refining, adjust the ratio of ingredients and increase the amount of carbon appropriately.
Stop feeding, thin material layer, low voltage, high current operation.
Pour (out) the furnace
Start the electrode first, and then start the electrode when the current is not less than 5000A.
The dumping furnace is ready to receive the package 0.5h in advance, and the cooling water is turned off.
When dumping, follow the principle of slow first, quicker, and slower last.
Leave a little melt to facilitate the next arc starting.
Pay attention to the tipping angle to prevent the nozzle from hitting the crimping package.
After pouring and resetting, when the electrode is 200～500mm away from the melt, the power supply will start.
Matters needing attention
Smelting process, there is no abnormal phenomenon, send full load as required, and reduce the number of electrode activities.
The furnace will not be unloaded for a long time, and the movable electrode can be forced to unload within 30-40 minutes.
After the electric furnace has a big reaction and the equipment is destroyed, or if the power is out for a long time, pay attention to the movable electrode.
If the electrode is stuck, you should get behind first.
Concentrate and run according to the process at full load.
White Fused Alumina Market size was valued at USD 825.93 Billion in 2023 and is expected to reach USD 961.83 Billion by the end of 2030 with a CAGR of 2.20% During the Forecast Period 2024-2030.
Within the abrasive and refractory materials industry, the white fused alumina (WFA) market is a specialist sector that concentrates on the manufacturing, distribution, and usage of high-purity aluminum oxide grains that are distinguished by their white coloring. High-grade aluminum oxide raw materials are melted in electric arc furnaces to create white fused alumina, which has a crystalline structure that is remarkably robust, abrasion-resistant, and thermally stable. The special qualities of white fused alumina are utilized in a variety of industrial sectors, such as electronics, refractories, ceramics, surface treatment, and abrasives.
In electric arc furnaces that are heated to temperatures above 2000 degrees Celsius, alumina raw materials-typically high-purity bauxite or alumina-rich industrial by-products are fused to produce white fused alumina. As a result of the process, a dense, crystalline structure with low impurity levels, white coloring, and high purity (usually greater than 99.5% aluminum oxide content) is formed.
During production, precise controls are made on the distribution of particle sizes, chemical composition, and physical attributes like toughness, hardness, and thermal conductivity in order to fulfill industry standards and customer specifications.
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
Todium 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.
What Are the Models of White Fused Alumina
In industry, white fused alumina is often divided into four types: granular sand, segmented sand, fine powder, and micro powder. Not an insider, I really can't categorize this, I always foolishly can't distinguish it clearly. Next, let's provide a detailed introduction:
White fused alumina particle size sand can also be referred to as single sand, generally referring to F12, F30, F54, F90, F100, F220 types of white fused alumina. Mainly used in the abrasive industry, it can also be used for the production and processing of grinding wheels and some refractory materials.
White fused alumina section sand generally refers to white fused alumina products with sizes of 1-0mm, 3-1mm, 5-3mm, and 8-5mm. White fused alumina sand has high temperature resistance, high hardness, and corrosion resistance, which can be used for steelmaking. The slag resistance of white fused alumina sand is also very good, so it can also be used to make ceramic products.
The common types of white fused alumina fine powder are 325-0 mesh, 240-0 mesh, 220-0 mesh, and 180-0 mesh, which are usually mixed sand because they contain white fused alumina fine powder with a particle size of 325 or more. Mainly used for grinding and polishing.
Although there is only a word difference between white fused alumina micro powder and white fused alumina fine powder, it should not be confused. The model of white fused alumina micro powder is a single particle size, with main particle sizes including W63, W20, W15, W10, W7, W5, etc. The processing procedures of micro powder are many and complex, so the price is also high. Mainly used for wet or dry sandblasting, i.e. the processing and production of refractory materials.
How to Store the White Fused Alumina Fine Powder
White fused alumina fine powder is excellent for casting powder and refractory castable. WFA powder 200 mesh, 220 mesh, and 325 mesh are always for those applications. The consumption quantity is large so many users buy a large batch of goods. So it has to pay attention to the storage of the powder:
Always keep ventilated and dry
Avoid humidity in the warehouse. Moisture will make the WFA powder agglomerate to blocks after absorbing humidity from the air.
Water vapor will hydrate, hydrolyze, and carbonic acid white fused fine powder. Humidity environment causes water spots, whitening, weathering, erosion, rust yellow, and other pathological changes.
Dustless circumstance
Dust will pollute the pure WFA powder. The storage should avoid dust workshops and warehouses.
Package isolated from air
White fused alumina powder suppliers always make a plastic bag as an inner bag and seal it. If using part of the bag, users should seal it again. That will make the WFA isolated from the air.
Do not cover carpet and sundries for a long time
In order to keep the white corundum ventilate, it is necessary to avoid covering the white fused alumina bag with carpets and sundries for a long time, otherwise, the moisture cannot volatilize through the pores. White corundum will be affected by moisture due to excessive moisture content.
Our Factory
Zhengzhou Fanchuang Science and Technology Co., Ltd. is located in Zhengzhou City, Henan Province-the center of China's abrasive and grinding industrial. We are manufacturer of abrasive and grinding wheels. More than ten years development, we have gradually established various production to cover abrasive and grinding industrial. We have reached a leading level in the industry in terms of the quality of related raw and auxiliary materials, the processing efficiency of machine equipment, and the rationality of production processes, Our company is not only an approved supplier of well-known domestic abrasive tool manufacturers, but also has established cooperation with world-renowned abrasive tool companies in the Middle East and Southeast Asia. With stable product quality, timely supply, and technical support, we have received comprehensive praise from customers.
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