Problems with extraction and back-extraction
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My solution is a mixture of aluminum nitrate, iron nitrate, and nitric acid, with a pH of 1. N1923 and TBP did not work; what extractant can be used to separate iron and aluminum from this solution (taking into account the excess amount of nitric acid)? What method can be used for back-extraction? Solve doubts.
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Is this solution valuable? ? ? Only by stating the valuable elements can they be of value
Is the purpose of the experiment to separate iron and aluminum? ? ?
Iron and aluminum can be separated by adding alkali; is extraction also necessary? ? ?
Increase the nitric acid concentration, use TBP
TBP doesn’t work; I’ve already tried it. The extraction efficiency of TBP is very low. Adding sodium hydroxide doesn’t work; iron will form iron hydroxide, and aluminum will form aluminum hydroxide. When there is an excess of sodium hydroxide, aluminum hydroxide cannot react completely to form sodium aluminate, as this aluminum hydroxide is not active. The method of adding alkali is inseparable from it. Extraction is the only option to consider. But it’s difficult to find extractants; it’s really hard.