Research on the formation mechanism of magnetized water used to wet coal dust based on experiment and simulation investigation on its molecular structures

Abstract

To better improve the effects of magnetization on the solution wettability, in this paper, the formation mechanism of magnetized water was investigated based on the combined method between the numerical simulation and experiments. The simulation results indicated that magnetization can reduce the first wave of the radial distribution function of water molecules; meanwhile, with the increase of magnetic field intensity, the diffusion coefficient of water molecules shows the four stages of changes, i.e. the slow change (0–200 mT), rapid increase (200–350 mT), stable period (350–450 mT) and reduce period (450–500 mT). In addition, the experimental results also show that as the magnetic field strength increases (0–350 mT), the K-M value of the solution gradually decreases, indicating that the hydrogen bond structures among the water molecules are reduced, which further verifies that the large molecular clusters break into smaller molecule groups under the magnetic field. The surface tension and contact angle of the magnetized water were reduced by 6.33%, 13.47% than that of the untreated water, respectively. It was concluded that the magnetization mainly destroys the hydrogen bond structures among the water molecules and reduces the solution cohesion to improve the solution wettability, which is of great significance for proposing the novel dust control technologies based on the magnetic method.