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18.11.2019  |  6485x
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Spherical graphite (SPG) is ideal for use as a material for anodes
Spherical graphite (SPG) is ideal for use as a material for anodes

New, Efficient Process for the Rounding of Graphite

The Netzsch business unit Grinding & Dispersing and Dorfner Anzaplan have joined forces to find a more efficient solution for graphite rounding to overcome the disadvantages of the previously widespread used process requiring more than 20 classifier mills installed in rows: In a first step, the flock graphite is pre-ground to the optimum initial particle size for spheroidization in a classifier mill or fluidized bed jet mill. The actual particle rounding process takes place directly downstream in the newly designed Netzsch gyRho Rounding Unit which is available in various construction sizes and can be specially designed to suit the necessary output quantity. For larger throughput volumes two (or more) machines can be operated simultaneously and can replace the train of 20 machines or more as mentioned above.

The increase in efficiency and the advantages which the new process-optimized system offers compared to the previous standard-plant train are impressive:
Plant availability has been increased by 30 % in comparison to previously used processes as the number of machines and consequently the probability of breakdown is reduced drastically. For this reason, maintenance costs are reduced by almost 90% and the compact setup means the plant can be installed in a 60% smaller space. In addition to this, the NETZSCH/Dorfner Anzaplan system requires only half the installed power of a plant train while achieving the same production capacity and using 60 % less energy due to its optimized mode of operation.

Product yield is a decisive improvement in the process. By optimizing the design of the grinding chamber and reducing the number of components, it was possible to increase yields of 30 to 40% achieved by the standard system to 60 to 65%. At the same time, using specific settings, it is possible to achieve the maximum yield of final product with the desired quality. Quality criteria such as distribution width, tap density and particle size can be influenced by varying the process parameters. In this way, using the newly developed Netzsch and Dorfner Anzaplan gyRho system, all qualities required by the market, such as spherical graphite with a tap density of more than 960 g/l and a d50 value of 16.8 µm (yield based on a raw material volume of > 60 %) are achievable.

Thus, using this process developed by Netzsch and Dorfner Anzaplan, not only a higher plant availability and raw material efficiency are achieved at the same production capacity but also a significantly higher product quality. The mentioned improvements result in an approximate 35% reduction of operational costs, demonstrating the technical superiority of this newly developed system solution which has decisively improved the economic efficiency of graphite rounding. In NETZSCH´s well-appointed application laboratory in Hanau, Germany, which forms part of our comprehensive service offer, graphite-rounding tests can be carried out on a laboratory scale and up to a production scale.

Company information

Netzsch Lohnmahltechnik GmbH
Netzsch Lohnmahltechnik GmbH
Netzsch Lohnmahltechnik GmbH is a service company with locations in Bobingen (company headquarters and administration) as well as the facility in Hanau and is part of the Business Unit Grinding & Dispersing in the Netzsch Group. As a leading international company, we also offer toll services for the wet grinding sector, which are performed at our location in Selb. We work with an ultra-modern and diversified selection of machinery for mechanical processing of a variety of materials. In addition to a pilot plant for product development and processing of small quantities, our state-of-the-art laboratories offer additional technologies for diverse analyses and quality assurance. We are mindful of providing the highest quality in all processes. The service we provide for your application also includes eminently important factors such as packaging, labeling and warehouse logistics, which our specialists adapt to your requirements with speed and flexibility. Hazardous materials are handled with exceptional professional responsibility. We also offer contract services in the area of wet grinding and dispersion of powders in liquids. Challenge us – we`ll work closely with you to find a customized solution. Whether the finest classification, demanding grinding tasks, or the related analyses – we always offer you a quick and professional solution. This allows you, for example, to bridge temporary capacity bottlenecks, introduce new products or outsource your own production without the investment risk. With our two locations in Bobingen and Hanau, we are always nearby and, as a company with world-leading processing technology, we offer you everything from one source – ISO certified and Made in Germany. See for yourself. We combine tradition, know-how and pioneering products in excellent quality and technology.
Last update: 06.06.2023
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