A method of bleaching secondary fibers. The secondary fibers are conveyed to the pulp desolver at a concentration of 20-40% after the pulp is formed. In the desorber, the pulp is mechanically treated and mixed, and the ink particles in the pulp are uniformly dispersed throughout the pulp, and the pulp is processed and During mixing, oxygen is also delivered to the skimmer at the same time, so that it is evenly distributed in the pulp. Through the action of oxygen on the fibers, the bleaching of secondary fibers is made more efficient.
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