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OPACIFIERS
 

Micronised Powders for the Ceramics Industry

 

Micronised and Milled Zirconium Silicate

 

Zircon (Zirconium Silicate) is a naturally occurring mineral which is extracted from alluvial sands and purified by physical and chemical means prior to being processed for ceramic, refractory and other applications. Its chemical composition is ZrSi04, it is a single substance and none of its silica exists as a separate mineral. Due to it being a natural product there are trace elements present in the crystal lattice.

 

Our ZircozonTM range of products are finely micronised zirconium silicates each with specifically controlled particle size and chemical composition, developed for the Ceramics industry for use as high performance Opacifiers in glazes, (Tile/Sanitaryware).

 

Typical Chemical Properties of Zircon

 
Zirconia + Hafnia
Zr02 + Hf02
66%
Silica
Si02
32.5%
Titania
Ti02
0.15%
Iron
Fe203
0.08%
 

Typical Physical Properties of Zircon

 
Specific Gravity
4.6
Refractoriness
2200°C
Particle Size

75 to 250 microns – processed in a range of sizes down to 1 micron

Colour

Cream-brown granules – processed in a ceramic mill to a white powder

Refractive Index
1.94 – 2.00
Hardness
7 Moh’s index

Processed Material Properties: Particle Size is Primary Selection Criteria

 

Micronised Products – Powders

 
Brand
Particle Size Microns
Specific Surface
Area cm2/G

Ceramic Glaze Opacity Colour Comparison Test L-value: 10% addition

Zircozon One
D50 1.2µ
40,000
92.5
Zircozon Five
D50 1.5µ
35,000
90.5
Zircozon Ten
D50 2.5µ
27,000
88.5
Zircozon Fifteen
D50 3µ
25,000
87.5
Zircozon 400DM
D50 3.5µ
20,000
 
Zircozon 600DM
D50 3.5µ
20,000
 
Zircozon 325WG
D50 4µ
15,000
Note: European Standard
Sanitaryware White glaze
L-value 88
Zircozon D
D50 4.6µ
4,000
 
Zircozon DM
D50 3.5µ
18,000
 

We have also introduced, for specific customers, Zircozon 5 Slop (Slurry).  It is a pure water based suspension suitable for transportation by road tanker, reducing waste and aiding ceramic glaze applications.  Minchem HMP Ltd operate our own road tanker for this purpose.

 
Application
 

Ceramic Colour and Glaze Opacification and Special Ceramic compositions, Filler Extender for plastics/rubbers, with particle size as the primary selection criteria.

 
Packaging
 

All dry powders are packed in 25 kg 3 ply paper sacks on wooden pallets of 1,000 kg net, 1,020 kg gross, shrink wrapped for transportation.

 
 

Testing Methods: Particle size by Coulter Laser System : Specific Surface Area by Cecil Spectrophotometer

 

The processes used by Minchem HMP Ltd is of sufficient flexibility to be capable of manufacturing short or long runs of customer’s own specific requirements.