Do You Only Care About Price for High-Alumina Balls?

High-alumina balls, also known as alumina ceramic balls or high-alumina ceramic grinding balls, are wear-resistant ceramic products made from α-alumina as the base material through pressing and high-temperature sintering.

1. Characteristics of Alumina Ceramics:

(1) High Alumina Content (92%): With high purity, they do not contaminate the ground materials. As alumina is inert, it hardly reacts with acids or alkalis, ensuring no chemical reactions with the materials being ground.
(2) High Hardness and Wear Resistance: Long service life. Alumina ceramics have a Mohs hardness of 9, just one level lower than diamond (Mohs hardness 10).
(3) Corrosion Resistance and High Mechanical Strength: The inert nature of alumina prevents reactions with acids and alkalis, avoiding the corrosion issues common in steel liners.

2. Technical Parameters of Alumina Ceramics:

Our 92% Alumina Grinding Balls:

• Alumina content: ≥92%
• Density: 3.65–3.68 g/cm³
• Equivalent wear rate: 0.08‰

For comparison, the technical parameters of most 92% alumina ceramic grinding balls on the market are lower:

• Density: 3.6 g/cm³
• Equivalent wear rate: 0.1‰

Although the density difference is small, the equivalent wear rate differs by 20%. You may wonder: What is "equivalent wear rate"?
The equivalent wear rate is a wear measurement standardized in laboratories, determined under the following conditions:

• A polyurethane tank with an inner diameter of 200 mm and length of 220 mm
• Filled with 4 kg of ceramic balls to be tested, 4 L of water
• Rotated at 80 rpm for 24 hours

While this scenario cannot fully simulate real-world conditions (which are far harsher), it is clear that the wear gap between balls of different qualities will widen in actual use.

Case Study:
A customer uses two continuous grinders (2.29.5 and 2.46) for wet grinding of potassium feldspar, with a daily output of 600 tons.

• Other manufacturers' balls: Daily consumption ≈500 kg
  • Cost per ton of material:600tons500kg×6.3yuan/kg​=5.25yuan/ton
• Higher-density grinding balls: Daily consumption ≈250 kg
  • Cost per ton of material:600tons250kg×7yuan/kg​=2.92yuan/ton
• Daily cost difference:(5.25−2.92)yuan/ton×600tons=1,398yuan/day
• Annual savings (based on 10 months of production):1,398yuan/day×30days/month×10months=419,400yuan/year

Actual data may vary slightly due to different working conditions across manufacturers. Recommendation: When purchasing high-alumina balls, prioritize technical indicators and quality over purely chasing low prices.