Pan grinder bleaching process of italian poplar APMP pulp and process optimizing method
A technology of process optimization and pulp disk, applied in the direction of chemical/chemical mechanical pulp, etc., can solve the problems of restricting the use of mechanical pulp, insufficient understanding of characteristics, output, quality, and consumption that cannot meet the process requirements, and reduce pulping pollution Good load, whiteness and good economic benefits
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[0013] Example 1: 1000kg of absolutely dry wood chips that meet the quality requirements are washed in hot water by a wood chip washing machine to remove silt, ironware and some wood chips, and then enter the pre-steaming bin and add low-pressure steam for pre-steaming, so that the temperature of the wood chips in the bin reaches 90-100°C, the pre-steamed wood chips are extruded in a wood chip extruder with a compression ratio of 4:1. The extruded wood chips enter the prepreg, where the mixed chemical solution and H are added 2 o 2 . Mixed liquid: NaOH50kg, NaOH 2 SiO 3 30kg, MgSO 4 ·7H 2 O4kg, H 2 o 2 30kg. The wood chips absorb the liquid in the prepreg and enter the reaction chamber. The wood chips out of the reaction chamber pass through the plug screw to extrude part of the residual liquid and then enter the steaming tube. The wood chips in the steaming tube pass through the single screw discharger to the pressure conveying screw. The bleaching agent is added at ...
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