| 摘要 |
<p>PURPOSE:To recover very efficiently V from ash contg. V after burning or unburned carbon by adding an extracting soln. forming each ion pair with a complex ion of V to an aqueous alkali soln. contg. V leached from the ash or carbon to transfer the V component to the phase of the extracting soln. CONSTITUTION:Ash contg. V and other metals produced by burning or gasifying heavy oil, residual oil, coal or the like or unburned carbon (they are generically named combustion residue) is brought into contact with an aqueous soln. of an alkali such as NaOH at ordinary temp. of above, especially 80-200 deg.C in an apparatus in which solid materia is leached. Most of the V and small amounts of Ca, iron, etc. are leached into the alkali soln. To the resulting soln. is added an extracting soln. forming each ion pair with a complex ion of V, e.g., a soln. of tri-n-octylamine dilute with kerosene, and the V component is extracted at 1-4 pH. After transferring only V to the phase of the extracting soln. by the formation of each ion pair, liq. separation is carried out to recover selectively only V which is a metal having the highest utility value in the combustion residue.</p> |
