Hydrogen Peroxide Bleaching of TMP Pulps using Mg (OH)2, 2002 Fall Technical Conference

A brief review of the chemistry of peroxide bleaching with Mg(OH)2 is given, and contrasted to conventional peroxide bleaching using sodium silicate and sodium hydroxide as the base. The results of laboratory experiments are also presented comparing conventional and Mg(OH)2 bleaching of TMP pulp. When both the caustic and silicate were replaced with an optimal level of Mg(OH)2, the pulp brightness equaled or exceeded the control bleaching at the same peroxide charge. At equivalent brightness, the residual hydrogen peroxide in the Mg(OH)2/peroxide bleaching stage was higher than for the control caustic/silicate/peroxide bleaching and suggests the possibility of recycling of peroxide for greater efficiency. The Mg(OH)2/peroxide bleaching stage also had lower COD and lower conductivity in the filtrate.

Author: Johnson, D.A., Park, S., Genco, J.M., Gibson, A., Wajer, M., Branch, B.
Hydrogen Peroxide Bleaching of TMP Pulps using Mg (OH)2
Hydrogen Peroxide Bleaching of TMP Pulps using Mg (OH)2, 2002 Fall Technical Conference
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