Process for removal of impurities from secondary alumina fines and alumina and/or fluorine containing material
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United States of America Patent
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Issued Date -
Jul 28, 2005
app pub date -
Jun 18, 2004
filing date -
Dec 19, 2001
priority date (Note) -
Abandoned
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Abstract
The invention relates to a process for removal of impurities from secondary aluminia fines and alumina and or fluorine containing material comprising. (a) acidification by adding an acid (2,12,32) to the material to be purified (1,11,31); (b) heading the acidified mixture (3,13,35); (c) leaching the mixture in a solution of an acid (6,16,39); (d) separating the solid and liquid.
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