Sandy Ridge Kaolin – Product Specification
SR02 Premium Coarse Kaolin for Ceramic Applications
Tellus Holdings Ltd’s (Tellus) kaolin clay will be mined from the up to 36m thick, 20 million year old, Sandy Ridge kaolinite clay bed, some 9 metres below the semi-desert of Western Australia. This is a low iron and bright firing hydrous kaolin clay, produced by chemical-free wet refining methods and is highly suitable for applications in ceramics, particularly tableware and glazes.
The following data is preliminary and is for information only. It does not constitute a contractual specification.
Product Form | Value |
---|---|
Material | Kaolinite |
Form | Lump |
Moisture Content | 12 % by weight |
Packaging | 1 tonne bulk-bag |
Potential Production Capacity | 12,000 to 40,000 tonnes per year |
Properties | Value |
---|---|
Physical | |
+45 microns retention (max) | 0.05 % w/w |
< 10 microns | 82 % w/w |
< 2 microns | 41 % w/w |
pH | 6.7 |
Modulus of Rupture (MOR) | 7 to 8 kg/cm2 |
Casting Data | |
Casting Concentration | 54 to 55 % solids by weight |
Casting Rate | 3.2 mm2/min |
Deflocculant Demand (to 5 poise) | 1.06 % w/w |
Fired (at 1180°C, oxidizing environment) | |
Fired Water Absorption | 26.8 % w/w |
Fired Brightness (ISO) | 93 to 94 % |
Fired Contraction | 6.90% |
Chemical | |
SiO2 | 47.0 to 47.3 % |
Al2O3 | 36.5 to 37.0 % |
Fe2O3 | 0.40 to 0.60 % |
K2O | 0.45 to 0.70 % |
TiO2 | 0.25 to 0.40 % |
CaO + MgO | 0.20 to 0.30 % |
Na2O | 0.04 to 0.08 % |
L.O.I. | 13 to 14 % |
Mn2O3, V2O5, Cr2O3, BaO, Zr2O, ZnO & SrO | All < 0.05 % |
Optical (unfired) | |
Brightness (ISO) | 83 to 85 % |
Yellowness (ECC) | 5.5 |
L, a, b (typ) | 95.7, 0.05, 3.5 |
Other | |
Water Soluble Salts | 700 to 800 ppm |