典型废纸加工利用过程中重金属去除特征研究

Removal Characteristics of Heavy Metals in Typical Waste Paper Processing and Utilization

关键词:  废纸再生  重金属去除  碎浆  脱墨  漂白

Key Words:waste paper recycling  heavy metal removal  pulping  deinking  bleaching

摘要:本研究模拟了3种典型进口废纸在“碎浆-脱墨-漂白”中重金属的去除程度。结果表明，3种进口废纸（1^#-包装用纸废纸、2^#-办公室打印废纸、3^#-杂志、报纸废纸）碎浆环节重金属分别去除了17.34%、13.70%、17.77%，1^#废纸材料较为洁净，不进行脱墨和漂白；2^#、3^#脱墨环节重金属分别去除31.14%、20.54%，漂白环节分别为13.73%、23.49%；整体再生利用环节重金属去除特征为60%~70%。碎浆环节对废纸中重金属去除效果一般，脱墨和漂白是去除废纸中重金属的主要环节，即通过脱墨和漂白可以去除废纸中印刷油墨、颜料等物质，进而降低纸浆中重金属含量。

Abstract:In this study， the removal degree of heavy metals in "pulping-deinking-bleaching" of three typical imported wastepaper was simulated.The results showed that the removal characteristics of 3 kinds of waste paper（1^#， 2^# and 3^#）in pulping process were 17.34%， 13.70% and 17.77%， respectively. 1^# waste paper material was relatively clean， so that it did not need to be deinked and bleached. The removal characteristics of heavy metals in 2^# and 3^# in deinking processes were 31.14% and 20.54%， respectively， and which in bleaching process were 13.73% and 23.49%， respectively. Overall recycling link heavy metal removal characteristics was 60%~70%.The pulping process had a general effect on the removal of heavy metals from waste paper， and deinking and bleaching were the main steps to remove heavy metals from waste paper.That is the printing ink， pigment and other substances in the waste paper could be removed， and the the heavy metal content in pulp could be reduced in deinking and bleaching.