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Speciality
Resin Applications
Chelation
Resins
The
metals chelation market is very broad and covers a range
of highly specialised applications for the capture and
/ or removal of metal from aqueous and other streams.
The products used in these applications are usually specific
to a particular metal type. They can be used to bond and
dispose of a toxic metals, as well as to capture and purify
more valuable precious metals.
The
Purolite® range of chelating resins covers lead, copper,
zinc, aluminium, cadmium, nickel, cobalt, magnesium, barium,
strontium, iron and mercury. The use of Purolite®
chelation resins covers the large industrial uses as well
as the small cartridge based units used in spark erosion
type services.
Chelation
Resins and the associated systems, have already been shown
to be indispensible for production of solutions of the
high purity needed in special processes. The efficiency
of removal of particular species ultimately depends upon
the property of selectivity. However, the advantage of
high selectivity has to be taken into account when considering
how best to remove the concentrated metal from the collecting
medium. In some cases resin destruction is economic and
useful. In others, it is the change of stability of the
chelation complex with the change in conditions between
exhaustion and regeneration which ensures near perfect
fixation and excellent removal on regeneration. Changes
in pH and ionic concentration are often the best means
to ensure efficiency in both parts of the cycle. The use
of electrolytic processes for regeneration can also be
considered, particularly for the electrodeposition of
precious metals.
The
need for chelation materials with specific properties
tailor made to suit particular industrial processes is
now a commercial reality.
Download
the Purolite Chelation Systems Bulletin |
