The Role of Magnesium Oxide In Paper Manufacturing

In paper production, acidic substances and pollutants in pulp compromise product quality and equipment durability. Magnesium oxide (MgO), an alkaline additive, addresses these challenges by neutralizing acids, regulating pH, and purifying pulp. Its application enhances paper density, strength, and bleaching efficiency while reducing environmental impact. This highlights MgO's critical role in optimizing paper quality and sustainable manufacturing processes.

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Neutralize acidic substances and remove pollution

Pulp may contain acidic substances and pollutants during the production process, which not only affect the quality of pulp,but also may cause corrosion to production equipment. Magnesium oxide, as an alkaline substance,can effectively neutralize these acidic substances, reduce the acidity of pulp,and remove pollutants, ensuring the purity and stability of pulp.

Adjust pH value to optimize pulp properties

The pH value of pulp is one of the key factors affecting paper properties. By adding an appropriate amount of magnesium oxide,the pH value of pulp can be effectively adjusted to achieve optimal production conditions. A suitable pH value helps to improve the density and strength of paper, making it more durable and tough.

Increase paper density and improve strength

The addition of magnesium oxide can increase the density of pulp,making the paper more compact. This helps to improve the strength of the paper, making it less likely to break or deform when subjected to external forces. Meanwhile, the increase in density can also improve the ink absorption and printing performance of paper, making printed materials clearer and more vivid.

As a bleaching aid

High purity magnesium oxide can be used as a bleaching aid in the bleaching process of pulp. It can help improve the whiteness and brightness of pulp,while reducing chemical oxygen demand and harmful substance emissions.

Conclusion

Magnesium oxide proves indispensable in modern papermaking by neutralizing acidity, stabilizing pH, and improving pulp purity. It enhances paper strength, density, and printability while supporting eco-friendly bleaching. As a multifunctional additive, MgO balances performance, cost-efficiency, and sustainability, solidifying its value in advancing paper industry standards.

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We all know that magnesium oxide and magnesium hydroxide are often used in rubber, plastics and flame retardant industries, but may be little understanding of both magnesium oxide and magnesium hydroxide play an important role in pulp refining, especially in the chlorine-free bleaching process. And because of its own special properties to the paper industry has brought a lot of help, let’s take a closer look at the application of magnesium oxide and magnesium hydroxide in the papermaking industry!

The actual effect of using magnesium oxide and magnesium hydroxide compared with traditional processes

In the papermaking industry, there is a process that requires bleaching of pulp. Magnesium hydroxide is used instead of caustic soda in pulp bleaching operations. Messi Biology conducted an experimental comparison with the traditional bleaching process and found that magnesium hydroxide can maintain the brightness of pulp, improve pulp viscosity, and reduce chemical oxygen demand (COD) and production costs. In the pulp hydrogen peroxide bleaching process, the use of magnesium oxide instead of caustic soda can reduce the iron and manganese ion content in the pulp to 2mg/L, and the use of magnesium hydroxide instead of caustic soda can reduce it to 10mg/L. And it can improve the quality of the pulp, thereby avoiding excessive iron content that makes the paper yellow.

Magnesium hydroxide

• Alkaline agent: The main function of magnesium hydroxide is to increase the pH value of the pulp, making it alkaline. This is conducive to the removal of lignin and other impurities, while also increasing the swelling and adsorption capacity of the fiber, and enhancing the effectiveness of subsequent bleaching chemicals.

• Hydrogen peroxide stabilizer: Magnesium hydroxide can stabilize hydrogen peroxide and prevent it from decomposing, thereby improving bleaching efficiency. Hydrogen peroxide is a commonly used bleaching chemical, but it is unstable under acidic conditions and easily decomposes. The alkalinity of magnesium hydroxide can keep the pulp neutral or slightly alkaline, thereby effectively stabilizing hydrogen peroxide.

• Fiber protector: Magnesium hydroxide can protect fibers from damage by bleaching chemicals. During the bleaching process, some strong oxidants such as hydrogen peroxide and chlorine dioxide are used. Although these chemicals can remove lignin and other impurities, they may also damage fibers and reduce the strength and toughness of pulp. Magnesium hydroxide can be adsorbed on the surface of fibers to form a protective layer to reduce the damage of bleaching chemicals to fibers.

Magnesium oxide

In summary, adding magnesium oxide or magnesium hydroxide can effectively improve the physical properties and aesthetics of paper and reduce papermaking costs, so it is widely used in the papermaking industry. Both magnesium oxide and magnesium hydroxide are important papermaking chemicals and play an important role in improving pulp quality and papermaking efficiency. With the promotion and application of chlorine-free bleaching technology, the application of magnesium oxide and magnesium hydroxide in pulp refining will become more and more extensive.

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