Foundry Chromite Sand: its characteristics and applications
Refractory chromite in granular form (chromite sand) is widely used in the foundry industry for both ferrous and non-ferrous castings, particularly in the automotive, shipbuilding and heavy-engineering sectors. The merits of chromite foundry sands include high refractoriness, good chemical stability, low thermal expansion – which means the mould retains a stable size – and high density and thermal conductivity (which promote rapid solidification of the casting).
Chromite sand main characteristics:
- Melting Temperature is 2150 ̊C
- High Thermal Conductivity
- High Heat and Thermal shock Resistance
- Slag Resistant
- Stable Shape due to the Heat
| Analysis |
Result % |
AFS |
51.59 |
| Moisture |
0.01 |
+850 micron |
0.1 |
| Cr2O3 |
46.05 |
+600 micron |
3.7 |
| SiO2 |
1.00 |
+425 micron |
12.2 |
| Al2O3 |
14.83 |
+300 micron |
40.3 |
| CaO |
0.18 |
+212 micron |
25.1 |
| MgO |
9,96 |
+150 micron |
10.1 |
| FeO |
25.89 |
+106 micron |
4.1 |
| Cr:Fe |
1.57:1 |
+75 micron |
2.9 |
| P |
0.004 |
+53 micron |
1.1 |
| S |
0.003 |
-53 micron |
0.4 |
| |
Acid Demand |
| 6.7 |
pH3 |
| 4.7 |
pH4 |
| 3.8 |
pH5 |
