| CGS | Coal gasification slag |
| FS | Coal gasification fine slag |
| CS | Coal gasification coarse slag |
| MB | Methylene blue |
| RLE | Leaching efficiency |
| CAC | Adsorption capacity |
| FS-N-2M-2 h-293K | The sample was obtained by 2.0 mol/L HNO3 at 293 K for 2 h. |
| FS-H-2M-2 h-293K | The sample was obtained by 2.0 mol/L HCl at 293 K for 2 h. |
| FS-S-2M-2 h-293K | The sample was obtained by 2.0 mol/L H2SO4 at 293 K for 2 h. |
| FS-F-2M-2 h-293K | The sample was obtained by 2.0 mol/L HF at 293 K for 2 h. |
| FS-C-2M-2 h-293K | The sample was obtained by 2.0 mol/L HAc at 293 K for 2 h. |
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