废纸制浆-大学讲义教学课件

废纸制浆SecondaryFiberRecycling第一节概述◆废纸制浆流程根据废纸的特征及纸浆的使用方向,当前废纸制浆可以分为2种流程,即非脱墨浆流程和脱墨浆流程◆非脱墨浆流程◆废纸一碎浆纤维分离—粗选洗涤—精选净化一一调整一一供抄造用脱墨浆流程废纸一碎浆—粗选一浓缩一揉搓或纤维分离脱墨—一精选一净化一调整一供抄造用、废纸回用的背景GlobalPaperandboardConsumptionOverthepasttwentyyears,globalpaperandpaperboardconsumptionhasgrown3.3%ayearoratotalof150milliontons.+3.1%/aOtherpaperand3.4%laPrintingandGlobalPaperandboardconsumptionThereisnoreasonglobalconsumptionofpaperandpaperboarddoesnotcontinuetogrow.Weforecast2.9%lagrowthuntil2010.MilliontonsForecast+2.9%/apaperGlobalPaperandBoardConsumptionPaperandboardconsumptionisgrowingrapidlyinNon-JapanAsiaanditwillsoonbecomeasimportantconsumingregionasNorthAmericaandEurope.NorthAmericaEuropeNon-JapanAsiaGlobalPaperandboardconsumptionThegrowthinglobalpaperandpaperboardconsumptionwillprovidemorepaperforrecycling.100milliotonsmoreGlobalPaperandBoardproductionNorthAmericaandEuropedominateglobalpaperandboardproduction,utNon-JapanAsiahasbeenthefastestgrowingregionMilliontonsEasternEuropeWesternEuropeNordicCountries1980ProductionandConsumption(milliont)2003USAChinaJapanProduction(&B)8022043.00030.295Consumption(P&B)88.14948.06030.797Percapitaconsumption(kg)3008358241.9wChina'sP&Bproductionandconsumptionarerankinginthesecondpositionworldwide二、废纸回用的意义1、节约原料,增加生成全世界木材年需求量20亿M以上,年增长率不低于25%;生产1T再生新闻纸浆比生1T磨木浆节约木材2M3,生产1高白度废纸脱墨浆比生产1T漂白化学浆节约木材5M32、减少污染,保护环境废水的污染负荷轻,耗水量少,无废气污染,减少木材砍伐率,有利于生态平衡和保护环境。3、节省能源,降低能耗生产1T再生新闻纸浆比生产1T磨木浆节约能耗75%左右,生产1T高白度脱墨浆较生产1T化学浆节