P-RC APMP pulping method of broadleaf wood mixed material

The invention provides a PRC APMP pulping method of a broadleaf wood mixed material, which comprises the following steps: taking broadleaf miscellaneous wood, eucalyptus and waste camphorwood chips asfiber raw materials; carrying out wood chip screening, first-stage pre-steaming, wood chip washing, single-screw dehydration, first-stage extrusion defibering, first-stage chemical liquid pre-soaking, second-stage extrusion defibering, second-stage pre-soaking, first-stage high-concentration pulping, cyclone separation, cooling, first-stage high-concentration bleaching, first-stage squeezing dehydration, separation, second-stage high-concentration bleaching, dehydration and latency elimination to obtain finished pulp; wherein the hydrogen peroxide consumption and the sodium hydroxide consumption of the two-stage chemical liquid pre-soaking are higher than those of the one-stage chemical liquid pre-soaking; and the whiteness gradient is improved through the first-stage high-concentration bleaching and the second-s