D751 is a macroporous polystyrene based chelating resin, with iminodiacetic groups designed for the removal of cations of heavy metals from industrial effluents. These cations may be separated from high concentrations of univalent cations (typically sodium) and also from common divalent cations (such as calcium). Removal can be achieved both from weakly acidic and weakly basic solutions depending on the metals to be removed.
D751 finds use in processes for extraction and recovery of metals from ores, galvanic plating solutions, pickling baths, and effluents even in the presence of alkaline earth metals (calcium and magnesium). Further important uses include the refining of the salt solutions of transition and precious metals and for the cleaning and purification of various organic or inorganic chemical products by removal of heavy metals contamination (usually from aqueous solution).
Macroporous Cross linked polystyrene
Opaque Beige Beads
Particle size (mm)
Moisture content %
Total Exchange Capacity (Min)
30g of Cu2+/L resin
Bulk density or shipping weight gms/ltr
Operating pH range
2-6 for H+/6-11 for Na+
Solubility in common solvents
Operating Temperature℃ (max)
Volume change% (max):H+ to Na+
SUGGESTED OPERATING CONDITIONS
Regenerant Flow Rate
Regenerant Contact Time
Regeneration Level 100%
Kgs/m3 of resins
Rinse Flow Rate
Running Flow Rate
APPLICATIONS: D751 is particularly suitable for the removal of heavy metals (as weakly acidic chelated complexes) which are held according to the following order of selectivity. Cu>>Ni>Zn³Co³Cd>Fe(ll)>Mn>Ca
The macroporous resin structure ensures excellent diffusion of ions thus affording efficient exhaustion and regeneration.
Recovery of heavy metals from effluents from the plating industry is achieved by concentration and is particularly useful where full demineralization and recycling of the rinse water is not practised. The simplest case is where only one heavy metal is present, when volumes of rinse water are low, waste water fees may be low, and raw water has a low salt content.
D751 can be used to reduce residual toxic heavy metals to below the maximum admissible concentration levels which are often far below those obtainable after precipitation reactions. It may also be used to remove similar residuals from demineralized rinse water circuits.
D751 is also used to separate and concentrate heavy metals in hydrometallurgical processes (ore dressing and scrap recovery). It is particularly suitable where metals are present in low concentrations. Separation techniques may be carried out according to the order of selectivity given above. However changes in the sequence occur with change in pH and in the presence of certain anions (including higher concentrations of chloride and sulphate). The sequence given above is applicable for neutral and weakly acidic solutions.
CAUTION: Strong oxidizing agents like nitric acid can cause explosive type reaction, when mixed with Ion Exchange resins. Knowledgeable sources should be consulted in the handling of this material.
NOTE: Ion Exchange Resins are sold on a volume basis, but are packed and shipped by weight. The shipping weight for each resin is fixed & does not take into consideration the variations in density and moisture content allowed within the product specifications. Therefore although the weight of the material is constant, there may be slight variations in volume, reflecting batch to batch variation of density and moisture content.
STORAGE CONDITIONS: The resin supplied in drums or bags should be stored in cool shed (warehouse) away from direct sunlight & should be periodically damped down with clean water.