South African Chromite Flour Becomes Mainstream Mineral Colorant for Green Ceramic Glazes
Against the trend of cost optimization and formula stability improvement in ceramic glaze industry, South African ceramic-grade chromite flour is widely adopted for antique tiles and art kiln-change glazes.
It features Cr₂O₃ ≥46% with stable Cr/Fe ratio and low impurities. It minimizes glaze defects like pinholes, blisters and bloom, and delivers consistent shade in continuous roller kiln firing. Different from synthetic chromium oxide green, it produces soft olive green alone. Blended with iron and zinc pigments, it can develop brownish-green and matte tones. It also works as nucleating agent for crystal glaze.
Available in 325mesh, 400mesh, 600mesh, 800mesh, 1200mesh. Thanks to stable supply and cost advantage, it is now a preferred natural chromium colorant for ceramic glaze formulators.
Physical and Chemical index
| Item | Unit | Index |
| Cr2O3 | % | ≥46.0% |
| SiO2 | % | ≤1.0% |
| FeO | % | ≤26.5% |
| CaO | % | ≤0.30% |
| MgO | % | ≤10.0% |
| Al2O3 | % | ≤15.5% |
| P | % | ≤0.003% |
| S | % | ≤0.003% |
| Cr/Fe | 1.55:1 | |
| Bulk Density | g/cm³ | 2.5-3 |
| Color | / | Black |
| PH | / | 7-9 |
| The amount of the acid | / | ≤ 2 ML |
| Percent soil | % | ≤0.1 |
| Percent Moisture | % | ≤0.1 |
| The sintered | ℃ | 1600 |
| Percentage of free acid present in the sand | % | 0 |
| filling density | g/cm³ | 2.6 |
| sintering point | °C | > 1,800 |
| melting temperature | °C | 2,180 |
Packing:1MT big bag