China Nonferrous Metallurgy

Aiming at the low oxidation rate and difficult utilization of magnesium flue gas desulfurization products, this paper studied the influence of the process system on the oxidation behavior of magnesium sulfite under pressure by using the method of forced oxidation of magnesium sulfite under pressure, and calculated the diffusion coefficient (D) of oxygen in solution by means of molecular dynamics (MD) simulation method, and explored the mechanism of system relative pressure (System pressure is 0.1MPa) on the diffusion behavior of oxygen in solution. The results show that high temperature and acidic environment in high pressure system can increase the diffusion coefficient of oxygen. In addition, with the increase of temperature, the oxidation rate of magnesium sulfite increased first and then decreased, and reached the highest when the temperature was 318K, while with the increase of pH value, the oxidation rate of magnesium sulfite decreased first and then increased, and reached the highest when pH=7.0. When the system relative pressure is 0.3MPa, the temperature is 301K and pH is 7.0, the oxidation rate of magnesium sulfite can reach 91.58%, and the oxidation rate is 3.99 times that of atmospheric bubbling reaction, which plays an important role in the resource utilization of magnesium desulfurization products.