Abstract
Magnesium-based alkalis have become an attractive alkali source in the peroxide bleaching process of high-yield pulps. The objective of this work is to evaluate the effect of industrial grade MgO with different particle sizes as the alkali source in the peroxide bleaching process of poplar chemi-thermomechanical pulp (CTMP). The effect of MgO with different particle sizes on pulp properties including strength and optical properties was investigated. With the particle size of MgO decreasing, the peroxide bleaching process produced a bleached CTMP with higher tensile and tear indices, whereas the bulk and light-scattering coefficients were less. The maximum ISO brightness (73.2%) was obtained when the particle size of MgO was 4.3 μm. The possible reason for the brightness change with the variation of particle size of MgO was discussed.
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