The principle of ammonium metatungstate ion exchange method is mainly based on the selective adsorption and exchange capacity of ion exchange resin. The following is a detailed principle description:
Raw materials and resin
Raw materials: The ammonium metatungstate ion exchange method mainly uses ammonium tungstate solution or ammonium paratungstate as raw materials.
Resin: This method uses strong acid or weak acid H+ type cationic resin. This resin carries H+ ions and can exchange with NH4+ ions in the solution.
Ion exchange process
At a pH of 3.5, the ammonium tungstate solution containing NH4+ is passed through the ion exchange column.
The NH4+ ions in the solution are exchanged with the H+ ions on the resin, the H+ ions enter the solution, and the NH4+ ions are adsorbed by the resin.
Ammonium tungstate conversion
Digestion at 98℃ for 5 hours to convert ammonium tungstate into a stable ammonium metatungstate solution.
This step promotes the release of NH4+ ions and further exchange of H+ ions.
Subsequent treatment
The obtained ammonium metatungstate solution is evaporated and concentrated to increase the concentration of ammonium metatungstate in the solution.
Subsequently, ammonium metatungstate (AMT) crystals can be obtained by freeze crystallization or spray drying.
Resin regeneration
The resin saturated with NH4+ can be regenerated by hydrochloric acid solution to replace NH4+ ions with H+ ions so that the resin can be recycled.
Features and advantages
This method can efficiently separate and purify ammonium tungstate to obtain high-purity ammonium metatungstate products.
By controlling the ion exchange conditions and resin type, effective treatment of ammonium tungstate solutions of different sources and concentrations can be achieved.
In summary, the ammonium metatungstate ion exchange method achieves the effective removal of NH4+ ions in ammonium tungstate solution and the conversion of ammonium metatungstate by utilizing the selective adsorption and exchange capacity of ion exchange resins, thereby obtaining high-purity ammonium metatungstate products.
More details of ammonium metatungstate product, please visit website: http://ammonium-metatungstate.com/
Please contact CHINATUNGSTEN for inquiry and order of ammonium metatungstate:
Email: sales@chinatungsten.com
Tel.: 86 592 5129595
