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Published in:
2016 | OriginalPaper | Chapter
Precipitation Area Upgrade at ETI Aluminum
Authors : Bekir Çelikel, Gokhan Kurşat Demir, Murat Kayacı, Meral Baygul, Carlos E Suarez
Published in: Light Metals 2012
Publisher: Springer International Publishing
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ETI Aluminum is an integrated facility that produces sandy alumina by processing boehmitic bauxite. With the development of aluminum smelting technology and greater attention given to environmental protection, the quality requirements of alumina are much strict. ETI has initiated a study to meet smelter grade alumina specifications of its internal electrolysis customer. The old precipitation circuit at ETI alumina refinery was converted to sandy alumina. The change involved modifications to existing tanks and flows to obtain proper hydrate agglomeration. The challenge has been to improve and control particle size distribution without losing precipitation yield and product quality. ETI has been able to reduce its minus 44 micron particles from approximately 40 % to 6–8 % by means of controlling the precipitation circuit parameters such as, alumina supersaturation, seed charge, temperature and classification. Improvements in hydrate occluded soda and attrition index were obtained.