Ion exchange resins are broadly categorized as chelating resin. Chelating group and polymer matrix make up the majority of it. Synthetic and organic polymers found in polymer matrices are insoluble but frequently swell in water and a variety of organic solvents.
They nearly always employ chelating chemicals covalently linked to a polymer matrix to bind cations. The bead form and polymer matrix of chelating resins are identical to those of common ion exchangers. They are mostly utilized to preconcentrate metal ions in diluted solutions.
Chelating ion-exchange resins are used for boron removal from potable water, brine decalcification in the chlor-alkali industry, and the recovery of precious metals in solutions.
The Global chelating resins market accounted for $XX Billion in 2022 and is anticipated to reach $XX Billion by 2030, registering a CAGR of XX% from 2023 to 2030.
New ion exchange resin for lithium extraction was introduced by LANXESS. The selective ion exchange resin Lewatit TP 308 from the specialty chemicals manufacturer LANXESS is the perfect choice for the purification of lithium salt solutions.
The solutions of lithium chloride, lithium hydroxide, and lithium sulfate are best suited for Lewatit MonoPlus TP 208, a resin having chelating iminodiacetic acid (IDA) groups.
LANXESS offers MDS types of both resins in addition to the monodisperse resin types in the MonoPlus line. These types have polymer beads with a diameter of about 0.4 mm, which is smaller than that of regular types (0.6–0.7 mm).
MDS resins display faster exchange kinetics and a significantly higher usable capacity due to the noticeably bigger specific surface.
Regarding the collection and separation of metal ions in aqueous samples for trace analysis, chelating resins created from organic synthetic polymers and a biopolymer, chitosan, have been examined. The behaviour of metal ions during their adsorption on resins and their capacity for adsorption have been well explained.
Chelating resins have been widely utilised in the analytical disciplines, where pretreatment with chelating resins is a potent approach that is required for an accurate and repeatable identification of trace metals.
The adsorption characteristics (adsorption conditions and adsorption capacities) of metal ions on the chelating resins are outlined in detail. Derivatives containing chelating moieties are created using organic synthetic polymers and a biopolymer as basic materials.
When it comes to rare earth elements (REE), the adsorption characteristics of chelating ion exchange resins with mixed sulfonic/phosphonic (SP), aminophosphonic (AP), or iminodiacetic (IDA) acid functional groups have been evaluated.
With regard to the hydrometallurgical processing of rare earth-containing minerals, the objective of this experiment was to ascertain whether such resins could potentially help in the isolation of a mixed rare earth product.
Particularly intriguing are the “chelating resins” with iminodiacetic acid or phosphonic acid functional groups rather than sulfonic acid functional groups.
These resins have demonstrated performance in well-established hydrometallurgy applications and a strong affinity for the adsorption of heavy metal ions. However, little research has been done on how these resins might be used in REE processing procedures.
A strong affinity for the adsorption of REE from acidic liquors was first discovered in the beginning on resins containing phosphonic acid functional groups. In contrast to other trivalent metals including Bi(III), Al(III), and Cr(III), the selectivity for the REE was shown to be superior to bivalent base metal ions.
Fe(III) was also absorbed in preference to the REE. The pH dependency and kinetic rate of Yb adsorption for resins containing iminodiacetic acid functional groups have been analysed.
There are also numerous reports on the separation of individual REE using iminodiacetic and phosphonic resins. In order to assess a variety of resins’ potential for use in the context of rare earth hydrometallurgical processing.
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