Apsil is a key additive in mechanical pulp bleaching processes. Silicates stabilize bleaching liquors by complexing transition metals that catalyze hydrogen peroxide decomposition and by buffering the pH to eliminate alkali darkening. Optimizing silicate addition levels will increase pulp brightness and reduce bleaching costs.
Apsil is also an important component in de-inking recycled paper. Silicates enhance ink removal and dispersion from paper fibers during pulping and flotation stages. They also act to stabilize hydrogen peroxide when it is added to improve brightness.
Apsil silicates are more stable in storage, provide higher alkalinity and better efficiency in these processes than regular sodium silicates. Therefore, an optimized use of Apsil silicates will lead to savings in production costs.