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Chrome ore sand is a natural mineral material mainly composed of chromite (FeCr₂O₄). It is processed into granular form through crushing, screening and other manufacturing processes. Its core component is chromium oxide (Cr), with a content typically ranging from 30% to 60%. It also contains components such as iron oxide (Fe), magnesium oxide (Mg), and aluminum oxide (Al). The specific chemical composition varies depending on the source of the ore. This material has a high melting point, excellent thermal stability, and good resistance to erosion.
| Project | Values/Characteristics |
|---|---|
| Color | Dark brown to black |
| Density (True Density) | 4.0 – 4.8 g/cm³ |
| Bulk density | 2.0 – 2.5 g/cm³ |
| Hardness (Mohs scale) | 5.5 – 6.5 |
| Melting point | 1900 – 2100°C |
| Coefficient of thermal expansion | Low（About 0.6 × 10⁻⁶ /°C） |
| Thermal conductivity | About 6 – 10 W/(m·K) (Or approximately 0.014–0.023 cal/(cm·s·℃)) |
| Cr2O3 | 46.0%min |
| Sio2 | 1.0%max |
| Feo | 26.5%max |
| Cao | 0.3%max |
| MgO | 10.0%max |
| AI203 | 15.5%max |
| P | 0.003%max |
| S | 0.003%max |
| Cr/Fe | 1.55/1 |
| PH Value | 7-9 |
Based on the differences in particle size range and application scenarios, chromite ore sand can be classified into the following types: AFS30 - 35, AFS35 - 40N, AFS40 - 45, AFS45 - 50, AFS50 - 55, AFS55 - 60, AFS60 - 65.
The physical properties of chromite ore sand determine its unique advantages in high-temperature casting. The aforementioned properties of chromite sand play a significant role in improving the quality of castings and reducing the defect rate during casting. This material helps extend the service life of molding sand and enables multiple recycling cycles. Therefore, chromite sand has become an indispensable basic raw material in the high-end casting industry (especially in key areas such as stainless steel, heat-resistant steel, and high-alloy steel).
Chromite ore sand serves as a critical raw material in high-end casting (e.g., stainless steel, heat-resistant steel), metallurgical smelting, and refractory applications. Its key advantages include superior corrosion resistance, exceptional high-temperature performance, and outstanding thermal stability. Additionally, it holds promising potential in chemical and wear-resistant material industries.
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