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.

Handheld XRF Analysis on Magnetite Fe% Variance Between Wet and Dry Sample (2 replies)

B
BiancaM
6 months ago
BiancaM 6 months ago

I'm using a handheld XRF device for random field analysis in my magnetite plant.

I take a wet magnetite sample from my feed to plant and get a Fe% of 58.72 % but when I let the same sample dry and I measure the Fe% with the same handheld XRF device, I get a Fe% result of 61.79 %. I've done more than one test and the dry magnetite sample is on average 2 % higher than the wet magnetite sample.

Why would there be a Fe% increase on the same material with the only difference being the moisture content? 

Any help would be much appreciated.

r
rob riggir
4 months ago
rob riggir 4 months ago

Hi Bianca,

The XRF analysis must be done at 0% moisture to get an accurate %Fe result.

Any moisture in the sample will dilute the result.

I have developed a system for accurate hand-held XRF analysis of both Fe and Ni if you are interested. rob.riggir@gmail.com

Regards

 

SmartDog
4 months ago
SmartDog 4 months ago

Let's take a quick look at this, R1 is reading 1, R2 is reading 2.  R1 is made up of S (sample) and W1 (water at reading 1), R2 is made up of S (sample) and W2 (water at reading 2).  If W1 > W2 then R1 < R2 as the porportion of S in the first reading is smaller than second reading.  You always need to factor in the water content.

 

Please join and login to participate and leave a comment.