Particle Technology

This subject covers aspects related to particle technology including powder and suspension processing. Initially, the student learns how to describe particles and systems of particles in terms of size, shape and distribution. Particle formation and synthesis will be covered. Understanding of the basic mechanics of fluid flow around particles is described. This knowledge is used as the basis for designing unit operations associated with powders and suspensions, including particle classification, particle breakage (comminution) and agglomeration, packed beds and fluidisation, flotation and powder storage in hoppers. Particle systems will be simulated using Discrete Element Modelling. The combination and variety of topics in this subject provides students with an appreciation of particulate processing. This knowledge is vital for numerous industries including (but not limited to) mineral processing, potable water treatment, wastewater treatment, food and pharmaceuticals. Particle size and measurement of particle size, shape factors, differential and cumulative distributions, mean size, median size and surface area Particle formation processes Generalised description of separation and classification efficiency based on particle size, density and composition. Hydrocyclones, screens and data reconciliation for particulate separators, including the two-product formula Comminution, Bond work index, matrix description of size reduction and milling circuit simulation, comminution circuits and liberation of particles from composite particles Flow properties of solids, design of bins and hoppers, mass and channel flow Particle settling including single particle and hindered gravity sedimentation Pressure filtration Motion of particles in fluids, fluidisation, minimum fluidisation velocity and bed expansion, flow of fluids through granular beds Modelling of particle systems

• 1Be able to describe particles and systems of particles and appreciate the flow behaviour of particulate materials
• 2Design unit operations associated with particulate powders and slurries common to the materials, food, water, pharmaceuticals and minerals processing industries
• 3Appraise different proposals for unit operations in comminution and particle liberation, particle separation, hopper flow
• 4Be able to design unit operations involving fluidisation and flow through packed beds
• 5Be fluent in Discrete Element Modelling of particle systems.