| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a treating method for decreasing a reducing substance in pulp entrained water after bleaching with a reducing bleaching agent containing hydrosulfite or thiourea dioxide. <P>SOLUTION: A treating method for bleached pulp comprises treating pulp entrained water obtained after pulp is bleached with a reducing bleaching agent containing hydrosulfite or thiourea dioxide, with (A) 0.1-5 times equivalent of hydrogen peroxide relative to the amount of a reducing substance in the pulp entrained water and (B) metal and/or metal salt, so that the amount of the reducing substance in the pulp entrained water is set to be 0.20 meq/L or less. <P>COPYRIGHT: (C)2012,JPO&INPIT |
