Abstract:

Due to its high risks in environmental pollution , great consumption of water and energy , and its limitedyields , the traditional bleaching technology (CEH) for low-consistency pulp by chloric agent is bound to be substitutedby such technologies as oxygen delignification , chlorine dioxide bleaching , and hydrogen peroxide bleachingfor medium-consistency pulp , or by the combined methods of these technologies. This paper analyzes the characteristicsof each bleaching technology and investigates the oxygen delignification and hydrogen peroxide bleaching forthe medium-consistency pulps with different stocks. Then , based on the engineering experience , the less-pollutionbleaching technology and the total-chlorine-free bleaching technology suitable for the paper industry in China arepresented , with the aim of meeting the increasingly strict environmental standards and implementing clean bleachingin paper industry.

Key words: medium-consistency Pulp, clean bleaching technology, fundamental, practice