NFS CERAMSITEFeatures namely advantages as follows
1. Round solid Ball shape:
The shape is mostly close to ball with smooth surface and lower specific surface area. AndNFShas very good air permeability good liquidity and easy to fill that can make the surface perfect when founded. Further more,NFScan flow very easily and easy to clean. The less felting liquid can be used than other sand when usingNFS.
2. Lower thermal expansion rate and thermal conductivity:
It is just this characteristic that make the foundry more precisely, less cracking and high output. Improve foundry quality.
3. Lower cleavage breakage rate:
NFShas high density and has very low cleavage breakage rate. Easily reclaimed that make it more protect environment for the less sand powder occurred.
4. High refractoriness and service temperature :
Major element is Al2O3 that has very good refractoriness. The service temperature is beyond 1820°Cthat can make it possible to found most of the metal fares.
The main numerical of Nice foundry sand compare with Zircon sand ZrSiO4 and Chromite sand
| Nice foundry sand | Zircon sand ZrSiO4 | Chromite sand |
PH | 7.65 | 4.56 | 8.24 |
Pile of density (g/cm3) | 1.95-2.05 | 2.9-3.1 | 2.6-2.7 |
True density (g/cm3) | 2.9 | 4.4-4.71 | 3.9-4.8 |
shape | spherical | irregular | irregular |
Binder addition amount (Sodium silicate +CO2 sclerosis ) | 3-4% | 7-8% | 7-8% |
Nice foundry sand process
1. Calcining 2. Fused 3. Granulation 4. Points sieve
Nice foundry sand