Alumina Grinding Balls
As a premium functional ceramic grinding medium, our Alumina Grinding Balls are engineered to deliver exceptional performance in grinding, crushing, and dispersing processes across diverse industrial sectors. Crafted with high-purity aluminum oxide (Al₂O₃) as the core component and advanced ceramic sintering technology, these balls stand out for their superior hardness, wear resistance, and chemical stability, making them the first choice for efficient and precise material processing.
1. Classification by Alumina Content
(1) Medium-Aluminum Balls (60%-65% Al₂O₃): Cost-effective option for general grinding applications. Suitable for grinding materials with low hardness, such as coal slime, fertilizers, and common minerals. Ideal for customers seeking balanced performance and budget-friendly solutions.
(2) Medium-High-Aluminum Balls (75%-80% Al₂O₃): Enhanced wear resistance compared to medium-aluminum balls. Widely used in the grinding of ceramic raw materials, building materials, and low-corrosivity chemical products. A versatile choice for medium-duty industrial grinding.
(3) High-Aluminum Balls (≥90% Al₂O₃): Premium grade with superior comprehensive performance. Further divided into 90-ceramic, 92-ceramic, 95-ceramic, and 99-ceramic subgrades. Among them, 92-ceramic balls are the most popular due to their optimal balance of performance and cost, widely applied in fine grinding of ceramic glazes, electronic materials, and high-purity chemical raw materials. 99-ceramic balls, with the highest alumina content, are designed for ultra-precision grinding in high-end industries like semiconductor and aerospace.
2. Customization Services
We understand that different customers have unique grinding needs. To meet your specific requirements, we offer comprehensive customization services:
Custom alumina content to match your grinding environment and material characteristics.
Custom sizes (from 1mm to 50mm) and shapes (spherical, cylindrical, etc.).
Special surface treatment for enhanced wear resistance or reduced contamination.
Custom packaging solutions (bulk packaging, bagged packaging, etc.) to facilitate transportation and storage.
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.
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Item
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95% Al2O3
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92% Al2O3
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75% Al2O3
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65% Al2O3
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Al2O3(%)
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95
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92
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75
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65
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Bulk Density(g/cm3)
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3.7
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3.6
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3.26
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2.9
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Adsorption(%)
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<0.01%
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<0.015%
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<0.03%
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<0.04%
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Abrasion(%)
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≤0.05
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≤0.1
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≤0.25
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≤0.5
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Hardness(Mohs)
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9
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9
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8
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7-8
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Color
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White
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White
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White
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Faint Yellow
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Diameter(mm)
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0.5-70
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0.5-70
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0.5-70
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0.5-70
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Divided By "Purity" to Meet Different Needs
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Alumina Content
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Key Performance Features
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Applicable Scenarios
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Cost Positioning
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60%-75%
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Low hardness (Mohs 7-8), high wear rate (>0.1%/1000 hours), low cost
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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)
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Lowest
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75%-90%
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Medium hardness, moderate wear rate (0.05%-0.1%/1000 hours), high cost performance
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Mid-range grinding needs, such as general ceramic glazes, water-based coatings, and mineral processing (balancing cost and performance)
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Medium
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≥90% (mainstream 92%, 95%, 99%)
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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
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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)
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Higher (the higher the purity, the higher the cost)
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Wide Applications:
Our alumina grinding balls are widely used in various industrial fields that require efficient and precise grinding. Key application areas include:
1. Ceramic Industry: Grinding of ceramic raw materials, glazes, and frits.
2. Coating & Paint Industry: Dispersing and grinding of paint, ink, and coating materials.
3. Mineral Processing Industry: Grinding of non-metallic minerals (e.g., quartz, feldspar, kaolin) and metal minerals (e.g., iron ore, copper ore).
4. Chemical Industry: Grinding of chemical raw materials, catalysts, and pharmaceutical intermediates.
5. Electronic & New Material Industry: Ultra-precision grinding of electronic ceramics, lithium battery materials, and semiconductor materials.
6. Food & Pharmaceutical Industry: Grinding of food additives, pharmaceutical raw materials (compliant with food-grade and pharmaceutical-grade requirements).
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
Need help? Be sure to visit our support forums for answers to your questions!
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.
Depending on the quantity, our delivery time is different. But we promise to ship as soon as possible with guaranteed quality.
Of course, we provide free samples.
Yes, of course, you are welcome to visit RBT company and our products.
There is no limit, we can provide the best suggestion and solution according to your situation.
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.
