Description
ResinTech SIR-300 is a macroporous chelating weak acid cation resin. SIR-300 has unique chelating functionality and is able to remove divalent transition metals preferentially to alkaline earth metals such as calcium. SIR-300 is intended for removal of low to moderate concentrations of heavy metals from waste streams.
Features & Benefits – Removes Heavy Metal Cations From Process Solutions: High capacity for removing traces of heavy metals from process waters even in the presence of hardness ions
– Removes Heavy Metals From Rinse Waters: Removes trace metals preferentially in slightly acidic waters prior to discharge or in front of other resins used in recycle recovery loops
– Superior Physical Stability: 93% plus sphericity and high crush strengths together with carefully controlled particle distribution provides long life and low pressure drop
– Controlled Particle Size: 16 to 50 mesh size provides a low pressure drop and superior kinetics
Applications: – Trace Metals Removal: The relative affinity of Resi nTech SIR-300 for heavy metals in near neutral solutions is in accordance with the following sequence:
H>>Cu>Pb>Ni>Zn>Co>Cd>Fe>Mn>Mg>Ca>Sr>B>>Na
High concentrations of chlorides or sulfates, or the presence of chelating or complexing agents can alter this sequence and likewise will affect the operating capacity.
High Chloride Solutions
Cu>Ni>Co>Zn>Cd>Fe
High Sulfate Solutions
Cu>Ni>Cd>Zn>Co>Fe
Resi nTech SIR-300 has similar chelating characteristics to EDTA and NTA, therefore it is less effective when these agents are present. For each particular metal cation there is a critical pH at which SIR-300 has optimum selectivity. For most metals this pH is approximately 4.0. As the pH decreases, so does the selectivity. At a pH of approximately 1.5, SIR-300 loses its ability to remove most metals. The minimum pH values for removal of some common metal ions are as follows:
Manganese 4.0
Iron 3.0
Zinc, Cobalt 2.7
Nickel 2.5
Copper 1.5
As the pH increases, selectivity generally decreases. Above a pH of 9.0 many metals form anionic complexes and are no longer present in a form that can be removed by ResinTech SIR-300.
Physical Properties – Polymer Structure: Styrene/DVB – Functional Group: Iminodiacetic
– Physical Form: Spherical Beads – Ionic Form as Shipped: Hydrogen
– Total Capacity:>1.1 meg/mL
– Water Retention: 50 to 60 percent – Approximate Shipping Weight: 44 lbs per cu. ft. – Screen Size Distribution (US Mesh): 16 to 50 – Maximum Fines Content (<50 mesh): 1% – Minimum Sphericity: 95% – Uniform Coefficient: 1.6 approx. – Resin Color: White to Tan
Suggested Operating Conditions – Maximum Continuous Temperature: 170°F – Minimum Bed Depth: 36 Inches – Backwash Expansion: 25 to 50 percent – Maximum Pressure Loss: 25 psi – Operating pH Range: 2 to 10 SU – Service Flow Rate: 0.5 to 2 gpm per cubic foot
