Chromium Plating Bath Contamination
Question: We recently had to dump a fairly large volume of hexavalent chromium plating solution because it was contaminated with a high level of zinc and other heavy metals.
Share
Question:
We recently had to dump a fairly large volume of hexavalent chromium plating solution because it was contaminated with a high level of zinc and other heavy metals. The cost of handling the waste treatment and disposal of this bath was extremely high. Is there a better way to handle this? J.A.
Answer:
In today's finishing environment dumping of a plating bath should be the last resort. In the case of a chromium plating bath there are two methods that should be considered for purification of the bath: electrodialysis and ion exchange. The equipment for these processes is readily available and reliable. Vendors are listed in the Suppliers database or in the 2001 Products Finishing Directory and Technology Guide, 800-950-8020, under Pollution-Control Equipment, water: electrodialysis and ion exchange.
Like any other good business decision, you should compare the cost of purification of the spent plating bath to that of waste treatment and disposal before making your decision to purchase equipment.
RELATED CONTENT
-
Masking for Surface Finishing
Masking is employed in most any metal finishing operation where only a specifically defined area of the surface of a part must be exposed to a process. Conversely, masking may be employed on a surface where treatment is either not required or must be avoided. This article covers the many aspects of masking for metal finishing, including applications, methods and the various types of masking employed.
-
Smut and Desmutting
Question: I am new to this industry and have heard about smut and desmutting operations.
-
Sizing Heating and Cooling Coils
Why is it important for you to know this?
