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Development of a preheater for particulate materials by ZEMDES GmbH


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ZEMDES GmbH engaged with the preliminary work on the development of a preheater for particulate materials since the beginning of 2016. The aim of this development is a preheater which can be used for multiple processes, which closes an offer gap at ZEMDES GmbH and contributes the technical standard in this sector at the same time.


In a variety of processes, it is necessary to thermally treat particulate materials to produce products with defined characteristics. The production of calcined lime, dolomite lime and sintered dolomite should be mentioned as examples. For the production of these products, shaft kilns and systems with rotary kilns can be used. In Europe, the production of quicklime and dolomite lime occurs mainly in shaft kilns, since they have low heat consumption.


However, the shaft kiln has limits when it comes to the processing of particulate materials with small particle sizes, high throughputs with a production line are to be achieved, or high-quality burned limestones are required for the iron and steel industry. In these cases, plants with rotary kilns are used as burning unit.


Worldwide, two pre-heating systems dominate the market in the field of quicklime production. This is, on the one hand, the cyclone preheater, which has its advantages when it concerns fine-grained feed material. However, the shaft preheater is more widespread. The predominant number of plants that are now being built with rotary kilns is equipped with a shaft preheater.


For the further development of such shaft preheater, ZEMDES GmbH has requested promotion from the land of Saxony-Anhalt and the European Union. This process was accompanied by TTI GmbH from Magdeburg. The grant of funding under the "EFRE European Regional Development Fund" program took place at the end of 2016. Development work will continue into 2018 and will be provisionally completed by the establishment of a pilot plant.

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