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Hoben International supplies a range of Zircon materials which have been chosen specifically for the investment casting and refractory industries
     The highest purity Zircon or Zirconium Silicate can be found in deposits close to the American, Australian and South African coasts. Zircon sand is separated from other minerals by ore dressing techniques during which strict controls are made to ensure the quality of the final product.
Depending on the application, Zircon sand may be calcined at a high temperature giving a stabilised product.

 
 

At Hoben Industrial Minerals one of the newest and most sophisticated plants in Europe, Zircon is processed and milled to the most stringent gradings and particle sizes required.
A range of Zircon materials is available. However for special applications alternative particle sizes can be processed.
CHEMICAL ANALYSIS ZIRCON 325 ZIRCON 200 ZIRCON SAND UNCALCINED ZIRCON SAND CALCINED
Zirconia & Hafnia ZrO2 + HfO2 66.00% 66.00% 65 - 67.3%  
Silica SiO2 33.00% 33.00% 32 - 33%  
Iron Oxide Fe2O3 0.10% 0.10% 0.0 - 0.1%  
Titania TiO2 0.15% 0.15% 0.0 - 0.3%  
Alumina Al2O3 0.10% 0.10% 0.0 - 0.5%  
 
PHYSICAL PROPERTIES        
Specific Gravity   4.6 4.6    
Melting Point   2200ºC 2200ºC    
Specific Surface   4000 2500    
Particle size below ≥75μ   90%    
Particle size below ≥45μ 90%      
Particle size below ≥30μ   50%    
Particle size below ≥15μ 35%      
Aperture size ≥212μ     0 - 2% Na
Aperture size ≥180μ     5 - 15% 0 - 10%
Aperture size ≥150μ     20 - 40% 10 - 20%
Aperture size ≥125μ     70 - 90% 40 - 60%
Aperture size ≥105μ     85 - 100% 60 - 85%
Aperture size ≥90μ     95 - 100% 85 - 95%
Aperture size ≥75μ     99 - 100% 95 - 100%
 

Fused Silica
Mullite 55
Zircon
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