Medium-concentration mixer for mixing bleaching agent and medium-concentration paper pulp

The invention relates to a medium-concentration mixer for mixing a bleaching agent and medium-concentration paper pulp. The medium-concentration mixer comprises a mixing chamber, a shearing rotor, a pulp inlet, a pulp outlet, and a distributor of the bleaching agent, wherein the distributor of the bleaching agent comprises a bleaching agent inlet and spray nozzles of the bleaching agent inlet; a rotor inlet end blocking plate and a rotor tail end blocking plate are respectively of a circular structure and are arranged at both ends of the shearing rotor, rotor shearing blades are connected between the rotor inlet end blocking plate and the rotor tail end blocking plate, and an inlet end movable shearing sheet is arranged at the outer side of the rotor inlet end blocking plate; an inlet endstationary shearing sheet is arranged at the inner wall of the inlet end of the mixing chamber, and a stationary shearing sheet is arranged at the inner wall of the mixing chamber; paper pulp passagesare respectively formed b