Table 3.
Lignin content and filtration retention of bleached kraft pulp combined with HW kraft lignin and retention aids. Mixtures with >95% retention were analysed in triplicate.
| Retention Aids | Klason Lignin, % 1 | Acid-Soluble Lignin, % 1 | Total Lignin, % 1 | Retention, % 2 |
|---|---|---|---|---|
| None | 6.5 | 0.3 | 6.8 | 85.9 |
| Tanfloc SG 2.5% | 9.7 | 0.9 | 10.7 | 91.0 |
| Tanfloc SG 2.5%, A-PAM 0.15% | 20.0 ± 0.3 | 3.1 ± 0.1 | 23.0 ± 0.2 | 98.4 |
| Tanfloc SG 2.5%, A-PAM 0.30% | 22.0 ± 3.2 | 2.9 ± 0.0 | 25.0 ± 3.2 | 103.0 |
| Tanfloc SG 2.5%, A-PAM 0.45% | 22.8 ± 0.8 | 3.3 ± 0.1 | 26.1 ± 0.7 | 99.4 |
1 Lignin values include the contribution from Tanfloc SG, if included; 2 100% retention is the sum of fibres, lignin, and retention aids applied.