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Separation of lanthanides by using ion-exchange method

Separation of lanthanides by using ion-exchange method

Grade:12

2 Answers

Yash Patari
askIITians Faculty 2123 Points
2 years ago
dear student,
Ion-exchange method: the most modern method for the separation of lanthanides is the ion-exchange method. In this method, synthetic cation resins are used. These resins contain−SO3H/−COOH−SO3H/−COOHgroups; the hydrogen in these resins is replaced with lanthanide ions. The aqueous solution contains a mixture ofLn+3Ln+3, which is allowed to pass down a column with cation exchange resin.
Ln+3(aq)+3HR(solid)⇔LnR3(solid)+3H+(aq)Ln+3(aq)+3HR(solid)⇔LnR3(solid)+3H+(aq)
The separation of lanthanides in the ion-exchange method is based on compounds like low solubility nitrates, oxalates, and fluorides, etc.Ion-exchange method: the most modern method for the separation of lanthanides is the ion-exchange method. In this method, synthetic cation resins are used. These resins contain−SO3H/−COOH−SO3H/−COOHgroups; the hydrogen in these resins is replaced with lanthanide ions. The aqueous solution contains a mixture ofLn+3Ln+3, which is allowed to pass down a column with cation exchange resin.
Ln+3(aq)+3HR(solid)⇔LnR3(solid)+3H+(aq)Ln+3(aq)+3HR(solid)⇔LnR3(solid)+3H+(aq)
The separation of lanthanides in the ion-exchange method is based on compounds like low solubility nitrates, oxalates, and fluorides, etc.
Navneet jha
63 Points
2 years ago
To separate the lanthanides from other elements occurring with them, they are chemically combined with specific substances to form lanthanide compounds with low solubility (oxalates and fluorides, for example). A process known as ion exchange is then used to separate the lanthanides from each other. In this process, a solution of the lanthanides in ionic, soluble form is passed down a long column containing a resin. The lanthanide ions "stick" to the resin with various strengths based on their ion size. The lanthanum ion, being smallest, binds most tightly to the resin, whereas the largest ion, lutetium, binds the weakest. The lanthanides are then washed out of the ion exchange column with various solutions, emerging one at a time, and so are separated. Each is then mixed with acid, precipitated as the oxalate compound, and then heated to form the oxide. A number of methods have been used to obtain the lanthanides in metallic form. For example, the oxides can be converted to fluorides or chlorides which are then reduced with calcium to metallic forms

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