MIXING EQUIPMENT
MIXING AT LARGE-SCALE? SILVERSON CAN HELP!
When it comes to large-scale mixing, Silverson has no equal
ilverson Machines are proud to be known as the world leader in the specialised design and manufacture of large-scale rotor/stator mixers, with capacities of up to 30,000 litres. All our large- scale machines are individually built to order and constructed specifically to suit each customer’s requirements.
S In-tank Batch Mixers
These large-scale in-tank mixers possess all the qualities and flexibility of Silverson’s medium range models and work on the same mixing principle, but they include a number of additional and unique features. Each mixer in the Silverson product range is designed and built to the highest possible engineering standards. For large-scale in- tank mixers these designs include specially balanced motors and the fitting of precision ground shafts which are finish turned in- house. This helps to ensure critical vibration free running which is essential at larger- scales. Quick release shaft couplings, split two-part downthrust propellers and hard- surfaced sacrificial shaft journal sleeves are just a few of the features designed to keep maintenance and downtime to a minimum. One of Silverson Machines' unique selling points is the ability to scale up our mixing equipment from the laboratory to full scale
production models. Many mixer manufacturers offer high speed laboratory mixers that have no production equivalent. Silverson, on the other hand, offers the largest range of capacities from a single manufacturer - from 1ml laboratory units up to some of the largest disintegrator systems on the market - with all Silverson mixers manufactured to the same precision engineered tolerances. As a result, we can offer scalable results across our entire product range. As such, these large-scale in- tank Batch mixers work in the same way as other in-tank rotor/stator mixers in the range. The high-speed rotation of the rotor blades within the precision-machined mixing workhead exerts a powerful suction, drawing liquid and solid materials upwards from the bottom of the vessel and into the centre of the workhead. Centrifugal force then drives materials towards the periphery of the workhead where they are subjected to a milling action in the precision-machined clearance between the ends of the rotor blades and the inner wall of the stator. This is followed by intense hydraulic shear as the materials are forced, at high velocity, out through the perforations in the stator and circulated into the main body of the mix. The materials expelled from the head are projected radially at high speed towards the sides of the mixing vessel. At the same time, fresh material is continually drawn into the workhead maintaining the mixing cycle. The effect of the horizontal (radial) expulsion and suction into the head is to set up a circulation pattern that minimises aeration caused by the disturbance of the liquid’s surface.
Twin Workhead Duplex Disintegrators The Duplex was specifically developed for the disintegration and solubilisation of solid rubbers and polymers for the luboil and adhesive industries, but its success has now
10 NOVEMBER/DECEMBER 2025 | PROCESS & CONTROL
seen its introduction into all fields of mixing, whether chemical, pharmaceutical or food. The Duplex differs from the standard multipurpose batch mixers in having two workheads facing in opposite directions; the upper head pulls materials down from the surface of the mix, while the lower head draws material up from the base of the vessel.
The combined use of two workheads makes the Duplex ideal for applications where light or buoyant material (powders, rubbers and polymers, etc.) needs to be drawn down from the surface of a mix and rapidly dispersed. Because of the added movement afforded by the two workheads, the Duplex is also ideal for use on high viscosity materials.
The Duplex is also commonly used for creating slurries and so it is often used in the reclamation of waste materials and ingredients such as hard confectionery, vegetables and meats.
D2500 Disintegrator/Dissolvers The largest model in the Silverson product range, the Silverson Disintegrator 2500 mixing system will disintegrate, solubilise or disperse the largest of solids - up to 1m across - in a single operation. Often reducing mixing times from days to hours.
The Disintegrator 2500 incorporates a powerful and unique Silverson mixer located in the bottom of a custom-built vessel. The mixer exerts a massive suction downwards from the surface of the liquid, pulling down even the most buoyant of solids, no matter what the size. These solids are literally ripped apart and dispersed throughout the mix, and with the refinement of a Silverson In-Line mixer included in the system, are totally solubilised or suspended.
Silverson Machines
www.silverson.co.uk
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