First, the addition of magnesia powder in the mixing process can play a stable role, prevent scorching in processing, and improve the scorching of rubber in the storage process, and also play a role in plasticizing rubber.

The addition of magnesium oxide at the beginning of rubber mixing can prevent the early crosslinking and cyclization of chloroprene and increase the safety of operation. When vulcanizing, it becomes a vulcanizing agent, which acts as a hydrogen chloride acceptor to prevent the hydrogen chloride from corroding the fibrous tissue. Magnesium oxide can improve heat resistance and aging resistance. The quality of magnesium oxide has great influence on the processing and vulcanization of chloroprene rubber. When the amount of magnesium oxide is increased to 10 phr, the colloid has higher plasticity and better storage stability.

Zinc oxide is mainly used as vulcanizate, which can make the vulcanization flat. Increasing the amount of zinc oxide can improve the heat resistance and aging resistance, but the compound is easy to scorch and reduce the storage stability of the compound. It can also harden and lose plasticity when used in large quantities. But it can increase the curing speed, the degree of curing and the high temperature resistance. Generally, the use of magnesium oxide and zinc oxide at the same time solves the scorchable scorching of vulcanizates, the high degree of vulcanization and the high speed of vulcanization, and the degree of shear crosslinking is much higher than that of single use.

Magnesium oxide wet desulfurization tower, the principle of desulfurization process is basically the same as calcium oxide wet desulfurization process. Flue gas enters the reactor radially from the lower part of the desulfurization reaction tower, contacts with magnesium hydroxide slurry in the process of rising in the reactor, and reacts with sulfur dioxide and magnesium hydroxide in the flue gas to form magnesium sulfite to achieve desulfurization effect. Magnesium sulfite physical properties belong to insoluble substances. Magnesium sulfate is partly converted into magnesium sulfate under the action of oxidation fan.

At the same time, harmful gases such as SO3, HCl and HF in the flue gas are also absorbed into the slurry in the absorption tower. With the consumption of magnesium hydroxide in the desulfurization tower, the pH value will decrease. Fresh slurry should be continuously added to the desulfurization tower, and the products of desulfurization reaction need to be discharged regularly. Because the main components of magnesium oxide wet desulfurization products are magnesium sulfite and magnesium sulfate, unlike calcium sulfate desulfurized by calcium method, calcium sulfate with low solubility can produce gypsum with high purity by using vacuum belt conveyor after swirling flow, and gypsum market is wide. However, for magnesium oxide wet desulfurization products are magnesium sulfite and magnesium sulfate, the solubility of magnesium sulfate is high, and the content of magnesium sulfite varies greatly with the operating conditions of the oxidation fan. It is impossible to extract magnesium sulfate or magnesium sulfite with high purity, and the market prospects are worrying because the purity of the extracted products can not meet the requirements. Therefore, there is no vacuum belt conveyor in the slurry disposal system of two desulfurization towers in the company to extract the products for comprehensive utilization. The slurry of desulfurization towers is directly put into the desulfurization wastewater disposal system. The disadvantageous factors such as high solid content, high temperature (53 C), low pH and large amount of wastewater from the slurry bring great difficulties to the treatment process of desulfurization wastewater.