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The Aluminium Oxid Stade GmbH (AOS) alumina refinery was built in the Stade-Bützfleth industrial zone between 1970 - 1973. The plant covers an area of 55 hectares (approx. 133 acres), and boasts an outstanding infrastructure. Production started at the end of 1973.


Our commitment to continuous improvement has allowed AOS to increase the nominal production capacity of 600,000 to over 1 million metric tons of alumina per year by enhancing processes and the infrastructure. These improvements have also significantly reduced emissions.


Aluminium Oxid Stade GmbH is a tolling company, owned by Dadco Alumina and Chemicals Limited. The technology was supplied by the former Vereinigte Aluminium-Werke AG.


Watch the AOS Facility "White Gold" Video




The production of aluminium trihydrate and aluminium oxide is based on the Bayer Process. Austrian Karl Josef Bayer received patents in 1887 and 1892 for his process to extract aluminium hydroxide from bauxite using caustic soda. The Bayer process has four distinct stages:  Digestion, Clarification, Precipitation and Calcination.




Our emphasis is on customer satisfaction and improving the organisation's effectiveness, efficiency and profitability.


In 1996, AOS gained certification in accordance with DIN EN ISO 9001 and in July 2006 was re-certified DIN EN ISO 9001:2000-12 (quality management systems), DIN EN ISO 14001:2005 (environmental management systems) and OHSAS 18001 (occupational health and safety management systems) by the accreditation body GAZ.


Our laboratory processes meet the Quality Management System Standards. The laboratory is accredited as per DIN EN ISO / IEC 17025:2000. 


A Quality Management delegate has been appointed to co-ordinate the quality function and the management handbook includes quality, environment and safety.

Download our ISO 45001 Certificate

Download our ISO 9001 Certificate

Download our ISO 14001 Certificate