Study on Ozone Bleaching of the Ammonium Sulfite Wheat Straw Pulp

摘要

With the rapid economic development, pulp and paper industry has changed from resource consumption to production of clean transformation. This paper is based on the single concentration (7.4%) ozone bleaching, while prolonging the reaction time of a single variable, ozone lignin removal efficiency and the impact on the fiber. After a lot of research and experiments repeatedly found that bleaching whiteness can reach 75.5% (%ISO whiteness), with the increasing of the degree of the tear strength in the ozone bleaching time declining, and finally to 240mN. Breaking length increased first and decreased state of change can be up to 2.1445km. Pulp hardness with KMnO_4 value represents the final reach 2.65. The best bleaching time should be 150 minutes, it can be made into pulp and paper all aspects of performance to achieve the best state.