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ResinTech - Model SIR-300 -Sodium Form Macroporous Chelating Weak Acid Cation Resin
ResinTech SIR-300 is a sodium form 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. ResinTech SIR-300 is intended for removal of low to moderate concentrations of heavy metals from waste streams. SIR-300 is supplied in the sodium form, can be special ordered in the hydrogen form (as SIR-300-H), or in the buffered form (as SIR-300 pH ADJ).
- Polymer Structure: Styrene/DVB
- Polymer Type: Macroporous
- Functional Group: Iminodiacetic
- Physical Form: Spherical Beads
- Ionic Form (as shipped): Sodium
- Total Capacity: >1.4 meq/mL (Na Form)
- Water Retention: 50 to 60 percent (Na Form)
- Approximate Shipping Weight : 44 lbs/cu.ft. (Na Form)
- Screen Size Distribution : 16 to 50 (U.S. Mesh)
- Maximum Fines Content: 1 percent (less than 50 Mesh)
- Minimum Sphericity: 95 percent
- Uniformity Coefficient: 1.6 (Approximate)
- Resin Color: White to tan
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
Trace Metals Removal
The relative affinity of ResisinTech 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
ResisinTech 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.