Table 3. Chemical Composition of Untreated CKDa.
| sample | K2O | CaO | MgO | Al2O3 | Fe2O3 | SiO2 |
|---|---|---|---|---|---|---|
| CKD | 32.8 | 30.8 | 0.20 | 0.94 | 1.07 | 2.7 |
a
XRF analysis, unit: wt %.
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