HIGH-PURITY ALUMINA PRODUCTION TECHNOLOGY: HYDROTHERMAL OXIDATION OF ALUMINUM AND FOLLOWING THERMAL TREATMENT
Published: 31 May 2015
Abstract: A new technology producing high purity alumina has been developed. Initial reagents for this technology are industrial aluminum micron powder of technical purity (99.8 %) and distilled water. The core of technology is hydrothermal oxidation of aluminum, which is carried out (under about 300 °С and 15 MPa) in special reactor developed for continuous and large-scale production. Conversion degree of aluminum is 100 %. Purity of produced alumina is 99.997 %, i.e. the impurity concentration doesn’t exceed 30 ppm. Produced alumina was successfully used for the production of alumina monocrystal.
Keywords: high-purity alumina, hydrothermal oxidation of aluminum, boehmite, hydrogen, sapphire, nanostructured alumina
Download full text
Back to the contents of the volume
© 2017 The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/3.0/
, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This permission does not cover any third party copyrighted material which may appear in the work requested.