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Pressurized peroxide (PO) bleaching was performed on three softwood kraft pulps, two ECF and one TCF. The inclusion of sodium silicate and MgSO4 7H2O improved brightness by up to 5 points G.E.; viscosity up to 6 cP; and yield up to 2.0% on pulp. Transition metals caused wasteful decomposition of the principal brightner, H2O2, resulting in a lower final brightness. The free radicals generated during the decomposition process degrade carbohydrates resulting in lower viscosity and yield. The sodium silicate/ MgSO4 7H2O combination adsorbed transition metals and decreased their activity. The combination also had a beneficial effect on O2 delignification of an unbleached pulp. The issue of scaling associated with silicate use is addressed.
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Yield After Pressurized Peroxide (PO) Bleaching of Softwood Kraft Pulps, 1998 Pulping Conference Pro