摘要
本研究模拟了混合办公废纸(MOW)的碱法制浆过程,探讨了在"碎浆-浮选-洗涤-漂白"回用处理各环节中,纸浆非纤维组分的去除特征.结果表明,在碎浆环节,灰分和淀粉的脱除率分别为71.5%和59.5%,此时油墨、溶解和胶体物质(DCS)和Ca2+的脱除率均较低,分别为29.4%、18.4%和28.8%.在浮选环节,油墨和Ca2+的脱除率分别提升53.5个百分点和31.2个百分点,而其他非纤维组分的去除效果一般.在洗涤环节,淀粉和DCS的去除特征明显,脱除率分别提升9.6个百分点和9.4个百分点;在漂白环节,纸浆中非纤维组分的去除效果受漂白条件的影响较小.综上所述,MOW经过回用处理,所得纸浆中油墨、灰分、淀粉和Ca2+的含量均明显降低,但仍在纸浆中有不同程度的保留.
Abstract
This study simulated the alkaline pulping process of mixed office waste paper(MOW)and explored the removal characteristics of non-fiber components of pulp in the various stages of reuse treatment as"pulping-flotation-washing-bleaching".The results showed that in the pulping process,the removal rates of ash and starch were 71.5%and 59.5%,respectively.At this time,the removal rates of ink,dis-solved and colloidal substances(DCS),and Ca2+were relatively low,at 29.4%,18.4%,and 28.8%,respectively.In the flotation pro-cess,the removal rates of ink and Ca2+were increased by 53.5 and 31.2 percentage points,while the removal efficiency of other non-fiber components was average.In the washing process,the removal characteristics of starch and DCS were obvious,with removal rates increased by 9.6 percentage points and 9.4 percentage points,respectively.In the bleaching process,the removal effect of non-fiber components of pulp was less affected by the bleaching conditions.In summary,the contents of ink,ash,starch,and Ca2+in the pulp were significantly re-duced after MOW reuse treatment process,but there were still varying degrees of retention in the pulp.
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