层硅用作纸浆H_2O_2漂白稳定剂

Study on Layer Crystalline Sodium Silicate as the Stabilizer of Hydrogen Peroxide Bleaching

对层硅用作纸浆H_2O_2漂白稳定剂的可行性进行了研究。结果表明,纸浆H_2O_2漂白过程中采用层硅替代Na_2SiO_3作稳定剂是可行的。在相同用量下,麦草浆的白度可提高1.5％～2.0％ISO,脱墨浆的白度可提高0.5％～1.0％ISO。在一定范围内提高温度和延长时间对漂白有利。层硅用作纸浆H_2O_2漂白稳定剂的适宜工艺条件为:浆浓10％,H_2O_2用量3％,NaOH用量1.5％,层硅用量3％,温度70℃,时间60min。在此条件下漂白麦草浆,白度增值可达14％ISO左右。此外,与Na_2SiO_3相比,层硅用作纸浆H_2O_2漂白稳定剂的成本略低。

The possibility of layer crystalline sodium silicate as the stabilizer of hydrogen peroxide bleaching was investigated. The results showed that layer crystalline sodium silicate in place of sodium silicate as the stabilizer of hydrogen peroxide bleaching is feasible. At the same dosage, 1.5%-2.0%ISO and 0.5%-1.0%ISO can be increased for wheat straw pulp and deinked pulp respectively. At the same brightness,the dosage of stabilizer can be saved 1%(based on oven-dried pulp). It is favorable for bleaching to increase temperature and time within a permissive extent. The suitable process conditions are 10%of pulp consistency,3% of hydrogen peroxide,1.5% of sodium hydroxide ,3% of layer crystalline sodium silicate, 70℃ and 60 min when layer crytalline sodium silicate is used as the stabilizer of hydrogen peroxide bleaching. At these conditions,the brightness gain can reach about 14%ISO for wheat straw pulp. In addition,it is favorable for bleaching to add a little magnesium sulfate when layer crystalline sodium silicate is used as the stabilizer of hydrogen peroxide bleaching,the brightness of pulp can increase 1%ISO if 0.05% of magnesium sulfate is added. The cost analysis indicated that layer crystalline sodium silicate is superior to sodium silicate as the stabilizer of hydrogen peroxide bleaching in economical aspect and has father the potential of market development.