摘要
脱墨浆中的金属离子不仅催化分解连二亚硫酸钠(保险粉),而且导致纸浆返黄,降低纸浆白度。本研究指出:螯合剂能有效地减少纸浆中金属离子的含量。在同样的保险粉漂白条件下,以0.25%三聚磷酸钠和0.25%焦亚硫酸钠预处理废报纸脱墨浆,较无处理可提高白度1.6%ISO。
Metal ions presenting in deinked pul p not only catalyze the decompositio n of sodium dithionite,but also induce color re version of pulp,thus bring down whiteness of pulp.The chelating agents r educe effectively the amount of free metal ions in the deinked pulp.The bleachi ng of deinked pulp from waste newsprint with sodium dithionite after the pre treatment with 0.25%of sodium tripolyphosphate and 0.25%of sodium metabisulfite,both based on the weight of the oven dry pulp ,gain 1.6%ISO higher than did the bleaching withou t pretreatment in the same processing conditions.
出处
《纸和造纸》
北大核心
2001年第6期10-12,共3页
Paper and Paper Making
基金
广东省科委重点项目99M05203G
制浆造纸工程国家重点实验室访问学者基金资助项目。
