| 摘要 |
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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