I was going though this paper "Extraction of vanadium from high calcium vanadium slag using direct roasting and soda leaching" but finally how could they extract from the leached solution I didn;t get.
Generally, metals recovery from a solid waste includes two stages. First, the metal has to be liberated from the solid complex through acidification or alkalinization. Then, the solution condition should be altered in a way (usually by pH adjustment) that the desired metal selectively precipitates in the form of metal oxide. Thereafter, the precipitate can be collected using filter paper. Other ways to recover the solubilized metal from the solution are electrowinning, solvent extraction, and ion exchange.
You can refer to the below paper for more info
Very often it does not need to recover pure metals. In case of Vanadium it is possible to get chemical compound of this metal in solid form and use it as a Vanadium source for steel making process. Vanadium is an alloying element for Steel and it require just 0.5-1% wt. in Steel. 80% of production of Vanadium is going to steelmaking companies.
The following techniques are used for recovering metal from leach liquor:
1. Selective precipitation
2. Solvent extraction
3. Ion-exchange
4. Electrowinning
The output of the techniques listed above is different.
- For selective precipitation, the output is a compound of the metal.
- For solvent extraction and ion exchange, the output is a pure solution of the required metal. You may subject the pure solution to precipitation or crystallisation or evaporation accordingly to obtain the required compound of the metal.
- By the electrowinning technique, you can extract the metal from the leach liquor or the pure solution obtained from solvent extraction/ ion exchange in metallic form.
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