Mg(OH)2 as Alkaline Source in Peroxide Bleaching of Wheat Straw Pulp

Ben Ping Lin; Yan Lan Liu; Ke Fu Chen

doi:10.4028/www.scientific.net/AMR.233-235.813

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 233-235Mg(OH)2 as Alkaline Source in Peroxide Bleaching...

Mg(OH)₂ as Alkaline Source in Peroxide Bleaching of Wheat Straw Pulp

Abstract:

The present work sought to make a contribution to the study on application of Mg(OH)₂ in peroxide bleaching of the wheat straw soda-AQ pulp. The results showed that: (1) for an unbleached pulp, when 24-73% of the NaOH was replaced with Mg(OH)₂, a higher brightness and viscosity were achieved comparing to the NaOH as the sole alkaline source. The brightness and viscosity of the bleached pulp at 48% of Mg(OH)₂replacement were respectively 6.4%ISO and 107 mL.g^-1 higher than those of the NaOH as the sole alkaline source. (2) for a chelated oxygen-delignified pulp, the brightness of bleached pulp at 24% Mg(OH)₂ replacement was considerable to that of the NaOH as the sole alkaline source, and at 48% Mg(OH)₂replacement 2.8% ISOlowerthan that of the NaOH as the sole alkaline source. While the viscosity increased consistently with the increase of Mg(OH)₂, and the COD load of bleaching filtrates at 24-48% Mg(OH)₂ replacement was lower 22-31% than that of the NaOH as the sole alkaline source. Therefore, partial substitution of Mg(OH)₂ for NaOH had positive effects on peroxide bleaching of wheat straw soda-AQ pulp.

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Periodical:

Advanced Materials Research (Volumes 233-235)

Pages:

813-816

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.233-235.813

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Online since:

May 2011

Authors:

Ben Ping Lin, Yan Lan Liu, Ke Fu Chen

Keywords:

Brightness, Hydrogen Peroxide Bleaching, Mg(OH)₂, Wheat Straw Pulp

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