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采用柠檬酸钠、Na2SiO3对废纸脱墨浆进行预处理,并与EDTA预处理进行比较。结果表明,柠檬酸钠可替代EDTA作为纸浆漂白的螯合剂,废纸脱墨浆柠檬酸钠预处理的最佳工艺条件为:柠檬酸钠用量0.8%、预处理时间30min、预处理温度70℃、pH值8。采用柠檬酸钠预处理,并经过氧化氢-甲眯亚磺酸两段漂白,漂后纸浆白度可达77.67%ISO。
Sodium citrate and Na2SiO3 were used to pretreat the waste paper deinked pulp and compare with EDTA pretreatment. The results showed that sodium citrate could replace EDTA as the chelating agent for pulp bleaching. The optimum conditions of sodium citrate pretreatment were: sodium citrate 0.8%, pretreatment time 30min, pretreatment temperature 70 ℃ , PH 8. Using sodium citrate pretreatment, and after two hydrogen peroxide - formamidine sulfonic acid bleaching, bleached pulp whiteness up to 77.67% ISO.