Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Chemical composition of clay.
| Chemical composition (wt%) | Clay before purification | Clay after purification |
|---|---|---|
| SiO2 | 65.41 | 76.58 |
| Al2O3 | 13.06 | 9.10 |
| CaO | 0.67 | 0.38 |
| Na2O | – | – |
| K2O | 0.37 | 0.17 |
| MgO | 1.44 | 1.86 |
| TiO2 | 3.92 | 3.80 |
| MnO2 | 0.35 | 0.93 |
| Fe2O3 | 14.66 | 7.09 |
| Cr2O3 | 0.03 | 0.02 |
| CuO | 0.00 | 0.00 |
| ZnO | 0.01 | 0.00 |
| ZrO2 | 0.05 | 0.04 |
| Nb2O5 | 0.01 | 0.00 |
| NiO | 0.01 | 0.01 |
| LOI | 0.38 | 0.13 |
