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Anionic and Cationic Exchange for Recovery and Purification of Chrome From Plating Process Waste Waters M. K. YOUNG Finishing Superintendent Die Casting Division Electric Auto-Lite Company Woodstock, Illinois In recent years ion exchange has found increasing application in the metal finishing industry for purification and recovery of process solutions. The advance of ion exchange methods for such purpose has been paced by the development of suitable ion exchange materials. A notable example of this has been in the purification and recovery of chromic acid used in chrome plating, anodizing and other finishing processes. In earlier investigations it was found that chromic acid attacked and destroyed ion exchange materials then available. Later, when sul- phonated polystyrene cation exchange resins were introduced, Costa1 established their effectiveness in removing metallic impurities from solutions containing as much as 100 grams per liter of chromic acid. The economic advantage of such purification by cation exchange was soon proven on a commercial scale.2 Costly disposal of contaminated chrome baths was no longer necessary and the hazard of stream pollution was greatly reduced. Of less economic advantage is the removal of chromate ion from process rinse waters by anion exchange. Bueltman3 has described this as a break-even proposition. To date the strongly basic quaternary amine type exchange resins have shown best results for removal of chromate ion from solutions containing 1000 parts per million (ppm) or less. Apparently all exchange resins of this type do not possess equal stability. Reents and Stromquist4 have recommended that chromic acid solutions be neutralized with caustic to prevent resin attack. Paulson and Saunders5 have not found this necessary. With ion exchange materials now available for purification and recovery, the elimination of chrome from waste effluent becomes largely a matter of adapting equipment design to particular requirements. Such has been the case at the Die Casting Division of the Electric Auto-Lite 454
Object Description
Purdue Identification Number | ETRIWC195638 |
Title | Anionic and cationic exchange for recovery and purification of chrome from plating process waste waters |
Author | Young, M. K. |
Date of Original | 1956 |
Conference Title | Proceedings of the eleventh Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://earchives.lib.purdue.edu/cdm4/document.php?CISOROOT=/engext&CISOPTR=4951&REC=18 |
Extent of Original | p. 454-464 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Date Digitized | 2008-09-22 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page 454 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | Anionic and Cationic Exchange for Recovery and Purification of Chrome From Plating Process Waste Waters M. K. YOUNG Finishing Superintendent Die Casting Division Electric Auto-Lite Company Woodstock, Illinois In recent years ion exchange has found increasing application in the metal finishing industry for purification and recovery of process solutions. The advance of ion exchange methods for such purpose has been paced by the development of suitable ion exchange materials. A notable example of this has been in the purification and recovery of chromic acid used in chrome plating, anodizing and other finishing processes. In earlier investigations it was found that chromic acid attacked and destroyed ion exchange materials then available. Later, when sul- phonated polystyrene cation exchange resins were introduced, Costa1 established their effectiveness in removing metallic impurities from solutions containing as much as 100 grams per liter of chromic acid. The economic advantage of such purification by cation exchange was soon proven on a commercial scale.2 Costly disposal of contaminated chrome baths was no longer necessary and the hazard of stream pollution was greatly reduced. Of less economic advantage is the removal of chromate ion from process rinse waters by anion exchange. Bueltman3 has described this as a break-even proposition. To date the strongly basic quaternary amine type exchange resins have shown best results for removal of chromate ion from solutions containing 1000 parts per million (ppm) or less. Apparently all exchange resins of this type do not possess equal stability. Reents and Stromquist4 have recommended that chromic acid solutions be neutralized with caustic to prevent resin attack. Paulson and Saunders5 have not found this necessary. With ion exchange materials now available for purification and recovery, the elimination of chrome from waste effluent becomes largely a matter of adapting equipment design to particular requirements. Such has been the case at the Die Casting Division of the Electric Auto-Lite 454 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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