Mixing Equipment PDF

Mixing Equipment Solid/Solid Mixing (a) Fixed Shell Mixers (b) Rotating Shell Mixers/Tumbler Mixers (c) Fluidised Bed Mixers 12 12 Fixed Shell Mixers...

Mixing Equipment Solid/Solid Mixing (a) Fixed Shell Mixers (b) Rotating Shell Mixers/Tumbler Mixers (c) Fluidised Bed Mixers 12 12 Fixed Shell Mixers All consist of a fixed shell into which an impeller is fixed e.g. a ribbon or paddle that moves during the mixing operation. Lifts material, rotates and distributes material in a totally random manner. Convective and shear mixing mainly to give a rapid coarse dispersion. There is a diffusive element to the mixing so that a very good mix may be obtained if left running Include trough, ribbon and paddle mixers. 13 Ribbon Mixer Nautamixer Simple Paddle Mixer 13 1  Rotating Shell Mixers/Tumbler Mixers A wide variety of shapes e.g. cuboidal, drum, cone mixers. An IBC (Intermediate Bulk Container) may be used as the mixing vessel. – An intermediate bulk container (or IBC) is a pallet mounted, industrial grade reusable container that is used for storing and transporting bulk liquids and powders. Moved by a pallet jack or forklift. More elaborate geometrical forms (e.g. V-blender, asymmetric drum) give movement of material in all planes - necessary for rapid mixing. In a V-shaped blender, the batch is continuously being split and recombined. In order to take advantage of this mixing and flow pattern, raw materials are generally loaded into the vessel in layers rather than side by side. Cube mixer Double cone mixer V-mixer 14 Asymmetric drum mixers 14 Rotating Shell Mixers/Tumbler Mixers Metal rods or "baffles" within the tumbler are often used to increase the amount of mixing and reduce the amount of dead space within the mixer. An intensifier bar (high-speed intensifier bar also known as lump breaker) can be used for applications that require more shear to breakdown agglomerates hence reducing lumps; can introduce liquid spray via this bar also. Diffusion is the main mechanism of mixing and the action is mild. Really only suitable for free flowing and granular materials and not for strongly aggregating materials. Can be used in making precise blends containing trace small amounts of one component (