Separation efficiency of liquid-solid undergoing vibration based on breakage of liquid bridge

Vibrating separation is a significant method for liquid-solid separation.A typical example is the vibrating screen to dewater wet granular matter.The properties of granular matter and the vibrating parameters significantly affect the separation efficiency.This study investigates the effect of vibration parameters in separation based on the breakage of large-scale liquid bridge numerically by using a calibrated simulation model.Through analysing the simulation results,the liquid bridge shape and the volume between two sphere particles for various particle sizes and particle distances were studied in the static condition under the effect of gravity.The results show a general reducing trend of liquid bridge volume when the radius ratio of two particles increases,particularly when the ratio increases to 5.Additionally,a set of vibrating motion was applied to the liquid bridge in the simulation model.A group of experiments were also performed to validate the simulation model with vibration.Then,the effect of vibrating peak acceleration,distance between spheres and radius on the separation efficiency which was reflected by the residual water were investigated.It is found that separation efficiency increased obviously with the peak acceleration and the increase slowed down after the peak acceleration over 1 m/s^(2).

Mechanism and inhibition of trisodium phosphate particle caking： Effect of particle shape and solubility

We investigated the influence of particle shape and solubility on the caking behavior of trisodium phosphate by considering the adhesion free energy and crystal bridge theory. Caking of trisodium phosphate during the drying process under static conditions is a two-step process： adhesion followed by crystal bridge formation between particles. The adhesion free energy plays an important role in adhesion. Trisodium phosphate particles cannot adhere to each other and cake when the adhesion free energy is greater than a critical value, which varies with particle shape. Compared with granular particles, cylindrical particles have larger contact area between particles, which results in more crystal bridges forming and a higher caking ratio. Thus, the critical value is about 100 mJ/m^2 for cylindrical particles, but 60 mJ/m^2 for granular particles at 25 ℃. Concerning the solubility, when particles are similar shapes and soluble in the rinsing liquid, the caking ratio has a linear relationship with adhesion free energy. However, if the particles are insoluble in the rinsing liquid, caking can be completely prevented regardless of adhesion free energy because no crystal bridges form during the growth process. Hence, caking of trisodium phosphate particles could be inhibited by screening rinsing liquids, and optimizing the particle shape and size distribution.