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).

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.

PACKING:

 
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.