Magnesium oxide is used to replace ammonia water in ammonium sulfite pulping. The research results show that: magnesium oxide is selected as the alkaline buffer, and the various indicators of the slurry can reach the level similar to that of the ammonia water method. Using magnesium oxide as a buffer, the pulp is easily bleached, which can promote delignification during the steaming process, reduce pollutant emissions, help protect the environment, and reduce costs.

Magnesium hydroxide can be used in pulp bleaching. Compared with the traditional bleaching process, magnesium hydroxide can replace caustic soda. At the same time, magnesium hydroxide can improve the viscosity of the pulp, maintain the brightness of the pulp, and reduce the content of COD and production costs.

In the process of bleaching pulp with hydrogen peroxide, magnesium oxide or magnesium hydroxide can replace caustic soda and play a role in reducing the content of iron and manganese ions in the pulp. Magnesium oxide can also avoid yellowing due to the presence of excess iron and improve the pulp the quality of. At the same time, magnesium oxide and magnesium hydroxide have a buffering effect, and it is easy to control the pH value. If it is used in combination with inorganic complexing agents such as phosphates and silicates, the effect will be better.

Magnesium oxide can act as a wetting agent to improve pulp deinking. The traditional sulfite pulping process is improved into magnesium sulfite pulping process. After the improvement, wood with lower quality can be used as raw material, and the produced pulp can be used to make news printing paper, and the chemicals and waste heat used are equal. Recyclable. In this way, magnesia solves many ecological and economic problems in traditional sulfite pulping operations for paper mills. The magnesium resource can be selected from magnesium oxide or magnesium hydroxide.