InterGroup Mining
Kaolin and
Silica Products
Kaolin, also called china clay, is a soft aluminum silicate clay mineral that is an essential ingredient in the manufacture of porcelain, paper, adhesives, rubber, paint, cosmetics, and fillers for cement.
| Description | Sizing | % by Weight | Comment |
|---|---|---|---|
| Clay/ Silt | <45μm | 46% | Typically 80+% kaolin + silica and micas |
| Silt/Fine Sand | >45μm;<150μm | 15% | Typically silica flour, some kaolin 11% |
| Sand | >150μm;<2.56mm | 35% | Typically silica |
| Granules | >2.56mm;<4.75mm | 3.5% | Typically silica |
| Oversize | >4.75mm | 0.5% |
Product Specification
| Base Kaolin Product | Enhanced Kaolin Product (classified) | High Purity Silica Product | Direct Shipped Ore | Mixed Kaolin & Silica Material | |
|---|---|---|---|---|---|
| Particle Size (typical) | <45μm | ≤45μm | >0.6mm; <2.56mm | >2.56mm | < 0.6mm |
| PSD < 2 μm | 50 % | 75 % | n/a | n/a | n/a |
| Moisture Content | 10 % (tbc) | 10 % (tbc) | n/a | 11 % | n/a |
| Unfired Brightness | 84 | 86 | n/a | 84 | 83 |
| Fired Brightness | 93 | 93 | n/a | n/a | n/a |
| Composition (typical) | |||||
| LOI (1,0003 C) | 13.3 % | 13.8 % | n/a | 7 % | 8 % |
| SiO2 | 47 % | 46 % | 99.7 % | 60 % | 54 % |
| Al2O3 | 37 % | 38 % | n/a | 31 % | 33 % |
| Fe2O3 | 0.9 % | 0.8 % | n/a | 0.8 % | 1.5 % |
| K20 | 0.8 % | 0.7 % | n/a | 0.9 % | 2.4 % |
| MgO | 0.1 % | 0.1 % | n/a | 0.1 % | 0.5 % |
| TiO2 | 0.25 % | 0.2 % | n/a | 0.2 % | 0.3 % |
| CaO | 0.01 % | 0.01 % | n/a | 0.01 % | 0.01 % |
| Na2O | 0.06 % | 0.06 % | n/a | 0.04 % | - |
| Theoretical Mica/Illite | 7 % | 5 % | n/a | 8 % | 20 % |