Magnesium Oxide In The Paper Industry
Due to the influence of environmental protection factors in the papermaking industry, manufacturers have carried out transformation and upgrading to change the previous production process. Therefore, magnesium oxide is more and more favored by customers in papermaking. Below we will learn more about the related matters of magnesium oxide used in papermaking.
Magnesium oxide is used to replace ammonia water in ammonium sulfite pulping. Magnesium oxide is used as the alkaline buffer, and the various indicators of the slurry can reach the level similar to that of the ammonia 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 oxide can be used in pulp bleaching. Magnesium oxide can replace caustic soda compared to traditional bleaching process. At the same time, magnesium oxide 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 can replace caustic soda to reduce the content of iron and manganese ions in the pulp, and it can also avoid yellowing due to the presence of excess iron and improve the quality of the pulp. At the same time, magnesium oxide has a buffering effect and 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 operations. 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, many ecological and economic problems in traditional sulfite pulping operations are solved for paper mills.