Abstract
The objective of this work is to evaluate the effect of applying industrial grade MgO with different grades of metal impurity partially substituting NaOH as the alkali source on the hydrogen peroxide bleaching process. In this study, the effects of pretreatments, such as washing in deionized water, washing in deionized water combined with chelating by EDTA, grinding by grinding machine, and grinding by grinding machine combined with chelating by EDTA pretreatments, on the removing of metal impurity from the industrial grade MgO were investigated. The residual H2O2 of bleaching effluent and the bleached pulp properties were determined. The results showed that pretreatments had positive effects on the removal of metal ions from industrial grade MgO, but there were no obvious effects on pulp properties. The bleached pulp applied MgO that was pretreated by washing in deionized water combined with chelating by EDTA had a similar brightness (75.91%) with control sample (75.41%), but which could cut16.73% of H2O2 consumption during the bleaching.
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