Chromium Reduction

Chemical Formula: Cr, CrO4
Present as: cation, anion

Chromium is a chemical element with symbol Cr and atomic number 24. It is a steely-grey, lustrous, hard and brittle metal which takes a high polish, resists tarnishing, and has a high melting point.
Ferrochromium alloy is commercially produced from chromite by silicothermic or aluminothermic reactions; and chromium metal by roasting and leaching processes followed by reduction with carbon and then aluminium. Chromium metal is of high value for its high corrosion resistance and hardness. A major development was the discovery that steel could be made highly resistant to corrosion and discoloration by adding metallic chromium to form stainless steel. Stainless steel and chrome plating (electroplating with chromium) together comprise 85% of the commercial use.
Low levels of chromium can leach out of chrome platings and from stainless steel. Dissolved chromium may be cationic (tri chrome) or an ionic (hex chrome) depending on pH and redox potential.

SIR-700 is best choice provided pH can be reduced, otherwise SBG2 or SBG1 may be better choices. SIR-700 is intended for single use and when pH is lowered to approx. 5.5 the throughput can be 100’s of thousands of bed volumes. SBG1 and SBG2 are brine regenerated and throughput depends primarily on competition from sulfate. * Note that Chromate is often reported “as Cr” which means the mwt is 52 and the equivalent weight is 26.

Divalent metallic contaminants such as copper, iron, zinc etc. can be removed from trivalent chromium (chromic acid) type plating baths, thereby extending the useful life of the bath.

Trivalent chromium is cationic and can be removed by a variety of cation exchange resins.

Related Products

CG8

Media Sub Category Strong Acid Cation
Polymer Matrix Styrenic Gel
Ionic Form Sodium
Applications:  

- Softening - Industrial
- Demineralization
- Iron Reduction
- Ammonia Reduction

SBG2

Media Sub Category Strong Base Anion
Polymer Matrix Styrenic Gel
Ionic Form Chloride
Applications:  

- Dealkalizer
- Demineralization
- Trace Contaminants (U, Cr, As, Se, F, ClO₄, ClO₃)
- Nitrate Reduction
- Sulfate Reduction

SBG1

Media Sub Category Strong Base Anion
Polymer Matrix Styrenic Gel
Ionic Form Chloride
Applications:  

- Demineralization
- Trace Contaminants (U, Cr, As, Se, F, ClO₄, ClO₃)
- Nitrate Reduction
- Sulfate Reduction

SIR-1000

Media Sub Category Chelating Resin
Polymer Matrix Styrenic Macroporous
Applications:  

- Copper Reduction - Trichrome Baths
- Solution Mining

WACG-Na

Media Sub Category Weak Acid Cation
Polymer Matrix Acrylic Gel
Ionic Form Sodium
Applications:  

- Heavy Metals Reduction
- High TDS Softening

SIR-300

Media Sub Category Chelating Resin
Polymer Matrix Styrenic Macroporous
Applications:  

- Trace Metals Reduction

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