![]() In addition, spherical particles separate faster than disk-shaped particles, so it would be beneficial if the particles could be pre-processed to be roughly spherical. "Larger particles separate more quickly, so it would be best to pre-process the mixtures so that they only consist of larger particles. "The simulations show that MDS performance efficiency depends on particle size, shape, and the pre-separation processes used to treat the plastic mixture before entering the MDS system." In addition, Tajfirooz studied the effect of flow turbulence on the separation performance.įrom the simulation results, Tajfirooz has recommendations for particle separation in MDS systems. "This work provides valuable insight on the motion of particles in the magnetic fields generated by MDS systems," says Tajfirooz. candidate Rik Dellaert and several MSc students. Tajfirooz validated the model by comparing simulation output with the experimental data of Ph.D. In the model, particles of varying shape (from spheres to disk-like particles) and size collide with each other and experience a hydrodynamic force from the surrounding liquid. research, Tajfirooz developed an efficient computational model to study particle-laden flows commonly processed in MDS systems. Optimizing MDS processes requires fundamental understanding of the motion of the millimeter-sized particles in flows of magnetic fluids. "It is faster, can continuously separate flows of plastic materials, it can separate multiple plastic types at the same time, and it's cheaper." "MDS is more efficient than traditional separation techniques for a number of reasons," says Tajfirooz. When the plastic particle mixture is introduced, the particles then move to regions where their mass density equals the apparent density of the fluid. In other words, the apparent density of the fluid is different at different heights in the fluid. The magnets change the hydrostatic pressure in the fluid and create a gradient of "apparent mass density" in the fluid. In MDS, a fluid is magnetized by magnets located at the top and bottom of a flow channel (see image). MDS uses Archimedes principle for fluids (buoyancy force on an object is the same as the weight of fluid displaced by the object) to separate different particles in a mixture. Like traditional sink-float methods where a mixture of plastics is separated into floating (light) and sinking (heavy) materials. Magnetic density separation (MDS) is a separation technique considered by many to be a game-changer in the plastic recycling industry, as it can continuously separate different plastic types from a flow of waste materials. The major challenge in the plastic recycling industry is the efficient separation of plastic waste by type and color, which would also help minimize the chances of high-grade recyclable plastics being mistakenly categorized as lower-grade plastics that cannot be recycled. ![]() ![]() One way to change this trend is through the development of more efficient plastic recycling and separation technologies. If the current plastic production and recycling trend continues, by 2050 roughly 12 billion metric tons of plastic waste will have accumulated as waste on our planet. ![]() The production, accumulation, and incineration of plastics directly contribute to climate change, ocean pollution, and infiltration in our food supply.
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