废报纸脱墨浆漂白及其配抄普通文化用纸研究

STUDY ON BLEACHING TECHNOLOGY OF ONP DEINKING PULP AND THE MAKING NORMAL CULTURAL PAPER

研究了废报纸脱墨浆(ONP)H2O2漂白段H2O2用量、NaOH用量、Na2SiO3用量、漂白温度及时间对纸浆白度的影响,并分析了用漂白废报纸脱墨浆配抄纸张物理性能的变化.结果表明:废报纸脱墨浆采用H2O2漂白时,其适宜工艺条件为:H2O2用量4%,EDTA用量0.2%,硅酸钠用量1.5%,硫酸镁用量0.05%,氢氧化钠用量0.5%,浆浓20%,温度80℃,时间2.5 h,漂后纸浆白度可达64%(ISO).普通文化用纸的抗张指数、裂断长、耐破度和耐折度随漂白废报纸脱墨浆用量的增加而下降.

The ONP deinking pulp was bleached with the hydrogen peroxide . The effects of H2O2 dosage, NaOH dosage, Na2SiO3 dosage, temperature and the reaction time of H2O2 on bleaching was studied. The effects of the physical properties of fine papers were studied, employing the bleached ONP deinking pulp. The optimum bleaching conditions are H2O2 4%, EDTA 0.2%, Na2SiO3 1.5%, MgSO4 0.05%, NaOH 0.5%, pulp consistency 20%, temperature 80℃ and time 2.5 h. The whiteness of pulp was up to 64%（ISO） at the opti- mum condition. And with the bleached ONP deinking pulp dosage increases, the amount of the tensile index, breaking length, burst strength and folding strength decreases.