Assaying, Microscopy, Mineralogy & XRF/XRD

Assaying, Microscopy, Mineralogy & XRF/XRD

  • To participate in the 911Metallurgist Forums, be sure to JOINLOGIN
  • Use Add New Topic to ask a New Question/Discussion about Assaying, Microscopy, Mineralogy & XRF/XRD.
  • OR Select a Topic that Interests you.
  • Use Add Reply = to Reply/Participate in a Topic/Discussion (most frequent).
    Using Add Reply allows you to Attach Images or PDF files and provide a more complete input.
  • Use Add Comment = to comment on someone else’s Reply in an already active Topic/Discussion.

Fire assay fusions with a bismuth flux (1 reply)

Marshal Meru
3 years ago
Marshal Meru 3 years ago

We are currently doing our fire assay fusions with a bismuth flux based recipe. I am curious about a stable bismuth recipe. We are using 60 parts sodium bicarbonate/20 parts bismuth recipe. I am curious if the sodium bicarbonate is too much, and I would like suggestions as to other reagents that would stabilize our duplicate sampling. There seems to be less reliable results from our current flux recipe vs a lead based flux. I am new at working with bismuth.

Thank you!

Todd H
3 years ago
Todd H 3 years ago
1 like by David

Asarco did a lot of work on this back in the 1990's.  Bismuth has been looked at for a long time and has not been generally employed mainly do to cost.  They actually had a patent on the method.

I am not sure what reagents would stabilize the recipe, it really depends on what the issue is - not enough bismuth reduced to alloy the precious metals, interferences....


Have a look at this patent as it provides some recipes that may be helpful.  Unfortunately fixing this issue is going to involve a lot of assay tests and it will be variable with ore types.


Todd Harvey - Global Resource Engineering

Please join and login to participate and leave a comment.