Chromite sand is a naturally occurring spinel consisting primarily of the oxides of chrome and iron. It is a by-product of ferro-chrome production and is mainly used in foundry applications and in glass production.
Technical Data Sheet of Foundry Chromite sand:
| CHEMICAL COMPOSITION | |
| Cr2O3 | ≥46.0% |
| SiO2 | ≤1.0% |
| FeO | ≤26.5% |
| CaO | ≤0.3% |
| MgO | ≤10% |
| AL2O3 | ≤15.5% |
| P | ≤0.003% |
| S | ≤0.003% |
| Cr/Fe | 1.55:1 |
| TYPICAL PHYSICAL PROPERTIES | |
| Hardness: | Mohs:5.5-6 |
| Melting Point: | Sublimes at 2180 ℃ |
| Sintering point: | >1800℃ |
| The sintered | 1600℃ |
| Specific Gravity: | 4.0-4.8 g/cm3 |
| Bulk density(LPD): | 2.5-3 g/cm3 |
| Color: | Black |
| PH | 7-9 |
| Percentage of free acid present in the sand | 0% |
| The amount of the acid | ≤2ML |
| Percentage of soil | ≤0.1 |
| Percentage of Moisture | ≤0.1 |
| Available size: AFS25-30,AFS25-35, AFS30-35,AFS35-40,AFS40-45,AFS45-50,AFS40-50,AFS50-55,AFS55-60,AFS60-65 325# 400# | |
THE ADVANTAGE OF FOUNDRY CHROMITE SAND
Comparing with silica sand,chromite sand can avoid most sand stick on the casting,therefor it can also save cost to make surface treatment. Moreover,chromite can be recycle used for several times upon to different technology.
Over all the chromite ore in the world, the one from South Africa are of the best quality level.Sicheng Abrasive import original chromite ore from there and refine it to better purity to 46% Cr2O3.