Any ideas would be appreciated. Thank you for your response. I considered the possiblity of magnetic separation however, the majority of the dark partiulates do not adhere to a magnet. I also find traces of material that appears to be a by-product of the manufacturing process, dried lubricant from equipment bearings, possible shavings from contact fit machine components, etc. The main reason to separate these impurities is visual, regardless of their composition.
Any info is appreciated.
I really don't see an easy answer here, it just takes some good old-fashioned research to solve this problem. Of course, you could contact someone else in this industry and ask if they've ever come across this problem. Feature Articles For Your Information ChE in Everyday Life ChE in Medicine Alternative Energy Proc. This site is maintained by Christopher M. A. Haslego,BSChE, an Alumnus of West Virginia University.