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A TEC commissions ReduDust Bypass Dust Treatment System

Published by , Deputy Editor
World Cement,

Using alternative fuels or Cl-containing raw materials typically requires a Cl-bypass system to control the Cl-loop in the pyroprocess. This leads to the production of bypass dust, which contains various types of salts.

To re-use the dust in the cement manufacturing, Ssangyong Cement Ind. Co. Ltd. with its plant in Donghae, Korea, has teamed up with A TEC Production and Services GmbH from Austria to install A TEC’s innovative ReduDust® process in their plant. The process will recover salts from the dust and produce bypass dust free of these components, which can be re-used and does not need to be deposited anymore. The ReduDust® plant for Donghae has a bypass dust treatment capacity of 35.000 t per year and has been commissioned in Q2/2021.

The scope of supply for this order by A TEC includes the engineering services and selected equipment supply including the required supervision and optimisation services.

Ssangyong Cement Ind. Co. Ltd. is one of the leading manufacturers of high-quality cement in Korea. The plant at Donhae has several state-of-the-art kiln lines, operating with significant alternative fuel rates, in operation. In the plant, o the A TEC Rocket Mill™ is also in operation to produce high quality solid alternative fuel for the kilns. By using the ReduDust® bypass dust treatment system, the plant has realised a novel waste-free Cl-bypass dust concept.

A TEC REDUDUST® Bypass Dust Treatment

Currently, large amounts of bypass dust are produced by cement clinker production systems, especially using alternative fuels, as an intermediate product. As this dust is highly loaded with chlorine and alkaline compounds, the utilisation of this dust in the cement mills is limited. Furthermore the disposal of this dust is quite expensive, as due to the high chlorine content it is often categorised as hazardous waste. The A TEC bypass dust treatment process (ReduDust) solves this problem as the contaminated bypass dust is used as a resource for the production of pure NaCl and KCl salts. The residual dust is free of these undesired components and can be recycled completely in cement production without enrichment of the undesired components. Not only can the costs of disposal be saved, but the lost amount of material from the bypass system can also be recovered effectively.


Modern suspension preheater kilns frequently face substantial problems of coating by dust deposition in kiln riser ducts, meal pipes, ducts and cyclones due to excessive contents of Chlorine (Cl) in the kiln system. A TEC’s bypass REDUCHLOR® consists of a take-off chamber above the kiln inlet, specifically designed for each installation and a specially designed quenching chamber where the Cl condensates on and adheres to the fine dust particles. After this condensation process, the Cl-enriched material is collected in a filter.

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