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Sandvik Process Systems will present its granulation systems – for applications including foodstuffs, subcooling melts and thixotropic, abrasive and corrosive products – at this year’s Schuttgut fair.

The company’s steel belt cooler, for instance, is designed as an integrated system, incorporating everything needed to complete the solidification process, from Rotoform feeding, steel belt and automatic belt tracking to release agent, discharge device and exhaust air system.

Each of the nine members of the Rotoform range has been designed to meet specific process requirements.

At the heart of every system is a special drop depositor – the Rotoform – which feeds droplets of the molten product onto a continuously running steel belt.

This is cooled by water from the underside, rapidly solidifying the product.

The droplets are discharged in the form of dry, uniform, free-flowing and dust-free pastilles – suitable for transport, storage and subsequent processing.

It is a highly flexible process capable of handling molten products at temperatures of up to 320C and viscosities up to 50,000cP.

Depending on the system used, pastilles can be produced in diameters from 1mm up to 30mm, and the diameter can be adjusted during operation via the feeding device or, for more major changes, by switching components.

Another benefit to users is the environmental friendliness of the system, according to the company.

The fact there is no contact between cooling water and the product being processed means there is no risk of cross contamination, while fast cooling times mean little or no exchange of gases, vapour or oxygen between chemical product and the surrounding atmosphere.

The Rotoform 3000 is the standard unit and is widely used for products such as hot-melt adhesives, resins, sulphur and waxes.

However, some oil and gas refineries need higher-capacity solutions and, to meet this need, the HS (high-speed) model was developed.

Through the use of a bigger rotating shell, reducing the centrifugal force on the droplet shape, Sandvik has been able to produce a system that delivers up to two times the throughput of a standard Rotoform while maintaining good control of the end product quality and delivering a consistent pastille with a regular, hemispherical shape.

The company can also supply conveying, storage and loading facilities, together with associated control systems.

Sandvik is able to undertake end-to-end project management, from feasibility studies and front-end engineering and design (FEED) through to complete engineering procurement construction (EPC) packages.

The company has invested in a network of test centres where all nine Rotoform types are available for demonstration and tests on customers’ own products.

In addition, transportable units have also been developed to allow tests and pilot production to be carried out on customers’ own sites.

Sandvik Process Systems

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