Magnesium oxide was chosen to replace ammonia in the role of ammonium sulfite slurry production. Alkaline buffering agent selected magnesium oxide, all indicators of pulp can reach the level similar to ammonia method. Using magnesium oxide as buffering agent, the pulp is easy to bleach and can promote the delignification effect in the steaming process, which can reduce the cost while reducing the pollutant emission and helping to protect the environment.
When bleaching pulp, magnesium oxide can be used. Compared with the traditional bleaching process, magnesium oxide can replace caustic soda. At the same time, magnesium oxide can improve the viscosity of the pulp, maintain the brightness of the pulp, and reduce the COD content and production costs. In the process of hydrogen peroxide bleaching pulp, magnesium oxide can replace caustic soda and play the role of reducing the content of iron and manganese ions in the pulp, also can avoid yellowing due to the presence of excessive iron and improve the quality of the pulp. At the same time, magnesium oxide has buffering effect, and easy to control the pH value. If with phosphate, silicate and other inorganic complexing agent with the use of the effect will be better.
Magnesium oxide can act as a wetting agent to improve the pulp deinking operation. The traditional sulfite pulping process is improved into magnesium sulfite pulp conditioning process, after the improvement can use lower quality wood as raw material, the pulp produced can be used to manufacture news printing paper, and the chemicals used and waste heat can be recycled. In this way, many ecological and economic problems of the traditional sulfite pulping operation are solved for paper mills.
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