High-pressure hydrogen peroxide bleaching method of soda pulp

The high-pressure hydrogen peroxide bleaching method for alkali pulp includes the following steps: using chelating agent to pretreat pulp, then respectively adding Na2SiO3, NaOH, MgSO4 and H2O2, thenusing medium concentration pulp pump to pump the pulp into the medium concentration pulp mixer, adding oxygen gas and steam into the medium concentration pulp mixer, adding oxygen gas and steam into medium concentration pulp mixer after the pulp is passed through the mixer, feeding the pulp into hydrogen peroxide bleaching tower, then feeding the pulp into pulp washing machine, then washing and cleaning. Said invention raise reaction pressure and reaction temp. for bleaching pulp, and greatly raises bleaching efficiency, and its waste water contains no chlorinated organics, and can be recovered by recovering procedure, so it implements the "zero discharge" of beaching waste water.