The role of magnesium hydroxide in refining paper pulp

   Magnesium oxide is used instead of ammonia in the production of ammonium sulfite pulp. The research results indicate that when magnesium oxide is used as the alkaline buffer, the various indicators of the slurry can reach a level similar to that of the ammonia water method.

                  Magnesium oxide is used instead of ammonia in the production of ammonium sulfite pulp. The research results indicate that when magnesium oxide is used as the alkaline buffer, the various indicators of the slurry can reach a level similar to that of the ammonia water method. Using magnesium oxide as a buffer can easily bleach pulp and promote delignification during the cooking process, reducing pollutant emissions and helping to protect the environment while also reducing costs.

           Magnesium hydroxide can be used in pulp bleaching. Compared with traditional bleaching processes, magnesium hydroxide can replace caustic soda. Meanwhile, magnesium hydroxide 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 or magnesium hydroxide can replace caustic soda to reduce the content of iron and manganese ions in the pulp. Magnesium oxide can also avoid yellowing due to excessive iron and improve the quality of the pulp. Meanwhile, magnesium oxide and magnesium hydroxide have a buffering effect and are easy to control the pH value. If used in combination with inorganic chelating agents such as phosphates and silicates, the effect will be better.
             Magnesium oxide can act as a wetting agent to improve pulp deinking operations. The traditional sulfite pulping process has been improved into a magnesium based sulfite blending process, which can use low-quality wood as raw material. The produced pulp can be used to manufacture news printing paper, and the chemicals and waste heat used can be recycled. In this way, magnesium oxide has solved many ecological and economic problems in traditional sulfite pulping operations for paper mills. And magnesium agent resources can choose magnesium oxide or magnesium hydroxide.