逆流提取工艺中浆料浓度对黑液提取率的影响

发布时间：2018-01-15 23:11

本文关键词：逆流提取工艺中浆料浓度对黑液提取率的影响　出处：《中国造纸》2017年11期 　论文类型：期刊论文

【摘要】：为定量探究碱回收工艺中浆料浓度对黑液提取率的影响,本研究以烧碱法红松浆和黑液为原料,采用逆流提取工艺,对不同浆浓的黑液提取率及浆料洁净度进行研究。结果表明,相比于15%浆浓,35%浆浓的黑液提取率从75.61%显著增加到98.19%。高浓提取不仅能有效促进碱回收,还可明显提高纸浆洁净度。浆料经过三段提取后35%浆浓的总残碱去除率、COD_(Cr)和BOD_5提取率分别为96.01%、95.0%和98.0%。浆中残余COD_(Cr)和BOD_5的大幅降低,不仅从源头上减少了污染物进入后续漂白和造纸工艺,还可提高漂白效率、降低漂白废水的污染负荷和毒性。
[Abstract]:In order to quantitatively explore the effect of slurry concentration on the extraction rate of black liquor in alkali recovery process, this study used caustic soda method Korean pine pulp and black liquor as raw materials, using countercurrent extraction process. The extraction rate and cleanliness of black liquor with different pulp concentrations were studied. The results showed that the pulp concentration was higher than that of 15% pulp. The extraction rate of 35% thick black liquor increased significantly from 75.61% to 98.19.The high concentration extraction can not only effectively promote alkali recovery. After three-stage extraction, the total residual alkali removal rate of 35% pulp concentration and the extraction rate of BOD_5 were 96.01%, respectively. 95.0% and 98.0.The large reduction of residual COD and BOD_5 in pulp not only reduces pollutants from the source into the subsequent bleaching and papermaking process, but also improves the bleaching efficiency. Reduce the pollution load and toxicity of bleaching wastewater.
【作者单位】：华南理工大学制浆造纸工程国家重点实验室;
【基金】：The national key research and development plan(2017-YFB0307900) 国家自然科学基金项目(21476091) 广东省科技计划项目(2015A020215009) 佛山市科技计划项目(2015AG10011)
【分类号】：X793
【正文快照】： 造纸工业是关乎社会经济发展和国民需求的重要基础产业之一,当前,中国已成为世界纸制品生产、消费和进出口大国。然而,我国造纸行业总排水量仅次于化工与钢铁行业,位居工业行业废水排放量第3位,COD排放量达全国工业COD排放总量的1/3。因此,造纸行业水污染治理不但是全社会关注

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