Alumina Grinding Balls
Product Description
Alumina grinding balls, made with aluminum oxide (Al₂O₃) as their core component and using a ceramic sintering process, are functional ceramic balls specifically designed for grinding, crushing, and dispersing materials. They are one of the most commonly used grinding media in industrial grinding applications (such as ceramics, coatings, and minerals).
Alumina grinding balls are categorized by their alumina content into three types: medium-aluminum balls (60%-65%), medium-high-aluminum balls (75%-80%), and high-aluminum balls (above 90%). High-aluminum balls are further divided into 90-ceramic, 92-ceramic, 95-ceramic, and 99-ceramic grades, with 92-ceramic being the most widely used due to its superior overall performance. These grinding balls feature high hardness (Mohs hardness of 9), high density (above 3.6g/cm³), wear and corrosion resistance, and high-temperature resistance(1600°C), making them suitable for fine grinding of ceramic glazes, chemical raw materials, and metal minerals.
Features:
High Hardness and Strong Wear Resistance: Mohs hardness reaches 9 (near diamond), with a low wear rate (<0.03%/1,000 hours for high-purity models). It resists brittleness and debris during long-term grinding, resulting in a long service life.
High Density and High Grinding Efficiency: With a bulk density of 3.6-3.9 g/cm³, it provides strong impact and shear forces during grinding, quickly refining materials to the micron level, with an efficiency 20%-30% higher than medium- and low-grade aluminum balls.
Low Impurities and Chemical Stability: High-purity models contain less than 1% impurities (such as Fe₂O₃), preventing material contamination. Resistant to most acids and alkalis (except concentrated strong acids and alkalis), high temperatures (above 800°C), and suitable for a variety of grinding systems.
Flexible Sizes and Compatibility: Available in diameters from 0.3 to 20 mm, the ball can be used in single or mixed sizes, compatible with ball mills, sand mills, and other equipment, meeting all needs from coarse to fine grinding.
Product Index
|
Item
|
95% Al2O3
|
92% Al2O3
|
75% Al2O3
|
65% Al2O3
|
|
Al2O3(%)
|
95
|
92
|
75
|
65
|
|
Bulk Density(g/cm3)
|
3.7
|
3.6
|
3.26
|
2.9
|
|
Adsorption(%)
|
<0.01%
|
<0.015%
|
<0.03%
|
<0.04%
|
|
Abrasion(%)
|
≤0.05
|
≤0.1
|
≤0.25
|
≤0.5
|
|
Hardness(Mohs)
|
9
|
9
|
8
|
7-8
|
|
Color
|
White
|
White
|
White
|
Faint Yellow
|
|
Diameter(mm)
|
0.5-70
|
0.5-70
|
0.5-70
|
0.5-70
|
Divided By "Purity" to Meet Different Needs
|
Alumina Content
|
Key Performance Features
|
Applicable Scenarios
|
Cost Positioning
|
|
60%-75%
|
Low hardness (Mohs 7-8), high wear rate (>0.1%/1000 hours), low cost
|
Applications with low requirements for material purity and grinding efficiency, such as ordinary cement, coarse grinding of ore, and building ceramic bodies (low value-added products)
|
Lowest
|
|
75%-90%
|
Medium hardness, moderate wear rate (0.05%-0.1%/1000 hours), high cost performance
|
Mid-range grinding needs, such as general ceramic glazes, water-based coatings, and mineral processing (balancing cost and performance)
|
Medium
|
|
≥90% (mainstream 92%, 95%, 99%)
|
Extremely high hardness (Mohs 9), extremely low wear rate (92% purity ≈ 0.03%/1000 hours; 99% purity ≈ 0.01%/1000 hours), and very few impurities
|
High-end precision grinding, such as: electronic ceramics (MLCC), high-end glazes, lithium battery materials (positive electrode material grinding), pharmaceutical intermediates (required to be free of impurity pollution)
|
Higher (the higher the purity, the higher the cost)
|
Applications
1. Ceramic Industry: Used for ultrafine grinding and dispersion of ceramic raw materials, improving the density and finish of ceramic products;
2. Paint and Pigment Industry: Helps disperse pigment particles evenly, ensuring stable color and a fine texture in paints;
3. Ore Processing: Used as a grinding medium in fine grinding of ores, improving beneficiation efficiency and concentrate grade;
4. Chemical Industry: Used as a stirring and grinding medium in various chemical reactors, promoting material mixing and reaction;
5. Electronic Materials Production: Used for grinding and processing electronic ceramics, magnetic materials, and other precision electronic components, meeting the high requirements for particle size and purity.
Company Profile
Shandong Robert New Material Co., Ltd. is located in Zibo City, Shandong Province, China, which is a refractory material production base. We are a modern enterprise that integrates the research and development, production, sales, kiln design and construction, technology, and export refractory materials. We have complete equipment, advanced technology, strong technical strength, excellent product quality, and good reputation. Our factory covers over 200 acres and an annual output of shaped refractory materials is approximately 30000 tons and unshaped refractory materials is 12000 tons.
Our main products of refractory materials include: alkaline refractory materials; aluminum silicon refractory materials; unshaped refractory materials; insulation thermal refractory materials; special refractory materials; functional refractory materials for continuous casting systems.
Frequently Asked Questions
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We are a real manufacturer, our factory is specialized in producing refractory materials for more than 30 years. We promise to provide the best price, the best pre-sale and after-sale service.
For each production process, RBT has a complete QC system for chemical composition and physical properties. And we will test the goods, and the quality certificate will be shipped with the goods. If you have special requirements, we will try our best to accommodate them.
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We have been making refractory materials for more than 30 years, we have strong technical support and rich experience, we can help customers design different kilns and provide one-stop service.
