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.

32
REPLIES
5045
VIEWS
Started by
I’m provided two tests on refractory gold ore (sulfide & carbon). The result was surprising. I don't understand why in minerals processing I cannot find any papers or websites about it. I'm interested in the "invisible gold" as the size of the gold...
Last replied to by Lhatch
Looking for a little help on where to get an assay for some arsenopyrite material. Also on how I should sample the material out of my 5 gallon bucket.
12
REPLIES
4732
VIEWS
Started by David
I would be interested in hearing your views on what you feel is the best XRF instruments (Brand, Model).  In particular for usage in analysis of environmental and geological samples.  Anyone who has used this type instrument, please tell me if it...
Last replied to by David
Hi James, I get great service/cost from https://www.911metallurgist.com/profile/DH/
20
REPLIES
1349
VIEWS
Started by
Field measurements performed on soil, rock, ore, waste etc using instruments such as portable XRF may not always be as accurate as laboratory analyses, but they can be performed in large numbers with little cost. They may therefore help to select the...
m
Last replied to by Moneer_Noor
is it work for Magnesite Ore?  
34
REPLIES
3876
VIEWS
Started by Standartenfurer
In mining and exploration, geologists and sample preparation technicians take a lot of care to correctly collect, sub sample and prepare a powder (pulp) of the original sample (usually starting a original lot of 1s to 10s of kilograms). Often the las...
A
Last replied to by Auggie
Some very interesting comments.  I've been in the assaying business for over 30 years and it always starts with the bulk sample, does it representative of the body of ore.  We would get bulk samples...
2
REPLIES
2731
VIEWS
Started by xvayia
Hello,  I am early researcher in XRF analysis and am wondering if it is finally so necessary the binder in pressed pellets or not. Someone advised me not  to use it, due to  the effect in matrix. Is is possible? Most of my analyzed samples are ge...
V
Last commented on by xvayia
Thank you very much for you response!
21
REPLIES
1583
VIEWS
Started by
Can somebody tell me the effective area/volume that is analyses by a hand held XRF? I'm experimenting with a Niton hand held GOLDD+ device reading some fine grained samples and want to get an idea of what proportion of the lot is being analysed with ...
Last replied to by
Well the final outcome of this experiment is that I came to conclusion is that PXRF is not going to work on mineral sands due to the significant matrix effects. I may revisit this another time when I ...
6
REPLIES
1600
VIEWS
Started by Zander Barcalow
I'm interested if anybody has tried out the Niton direct rock sampler (especially on drill core).See http://is.gd/BR0Cf2Would be particularity interested to see how this validated against half core samples
Last replied to by Oberstorm
I have not yet bought this clever tool (a battery grinder fitted with a dust collector) but this obviously something that may allow more representative rock analysis on field than direct shooting.Comp...
7
REPLIES
2025
VIEWS
Started by
I'm interested to hear from fellow members on the type/manufacturer of XRF instrumentation that are in use for the determination of the following bauxite parameters: Total Al2O3, Available Al2O3, Total SiO2, Reactive SiO2 and Fe2O3. We have a PIMA MA...
1
Last replied to by
The comments on the importance of sample preparation for accurate XRF analysis are well placed. The entire process chain can be considered, finding the right balance between material type, sample size...
7
REPLIES
1407
VIEWS
Started by OberstGruppen
I'm looking for some published information relating to differences between press-powder and glass fusion preparation for nickel laterite deposits. If you point me in the right direction particularly the likely shortcomings of pressed-powder in terms ...
U
Last replied to by Unterstarm
The grain size is critical. On a project we worked on (not Ni laterite) variable grain size produced by LM5 pulverizing produced an unpredictable low bias between 0-20percent. It was impossible to con...
8
REPLIES
1192
VIEWS
Started by Zander Barcalow
Is an adjustment factor required to convert specific gravity to bulk density? And if so is it based upon mineralogy?
Last replied to by
Couple of other pieces of information necessary: Are the place, timing and time where you want Bulk Density to be measured!Bulk density will depend heavily on the condition of the material - pre-blast...
16
REPLIES
1126
VIEWS
Started by Sandeep Bisht
I have been calling suppliers of XRF analyzers trying to look for a handheld XRF machine that maintains good accuracy without having to prepare the sample i.e. no crushing and pulverizing. Essentially I would like to shoot a beam at a freshly blasted...
Last replied to by Maya Rothman
LIBS are less represented here because it is still by far more experimental than pXRF. Its promising points are a better aptitude to deal with light elements and the possibility to use it at distance...
26
REPLIES
1327
VIEWS
Started by
Process mineralogy is a term that is used in a lot of contexts from process optimization to geometallurgy but its usefulness and application is often clouded by misconceptions that it is too hard or “our ore body is homogeneous and simple”. I fee...
Last replied to by
Totally agree. I found most people in the minerals processing world do not value the fundamental research much. They would rather spend $ on inefficient and ineffective testing regimes instead of look...
11
REPLIES
1327
VIEWS
Started by Victor Bergman
Can an XRF analysis well high sulfide samples. High grade ore chips or flotation concentrate?
Last replied to by
The portable XRF can very well handle mineral concentrate analysis very accurately such as columbite, tantalite, cassiterite, monazite, etc.
5
REPLIES
1259
VIEWS
Started by
I am working on a V-Ti deposit that is hosted in a magnetite bearing gabbro and are planning open pit mining of the recently defined reserve. As mineralisation was visual I have abundant assays of the ore (several thousand) but very few (a few hundre...
Last replied to by
Yes seeing DL for S in the 100-200 ppm range on SOIL Mode with 100 second read time, and most rock material 200-1000+ppm. Readings are quite low compared to S standards and calibration (post-) require...
16
REPLIES
1133
VIEWS
Started by
Nice video, but as ever the diffraction get to do all the exciting stuff and us XRFers are left with analyzing cement and oil etc. Although, we do on occasions get to do some unusual tasks (see one of my recent posts) X-ray crystallography ...
Last replied to by Bob Mathias
Let’s distinguish two processes: data exportation and data importation. Of course I don’t have experience with all XRF software but I worked and tried some of them and they offer at least few data...
3
REPLIES
2788
VIEWS
Started by
I´m new in this interesting in Data Interpretation in qualitative analysis and hope you can help me with this:I have a powder Ag sample (containing little quantity of Ag2O) and have performed a WDXRF qualitative analysis (Rhodium target) with the ...
Last replied to by
Thank you all for these valuable contributions! In fact, I also analysed this sample with the LiF200 crystal and these peaks don´t appear.
7
REPLIES
1847
VIEWS
Started by Maya Rothman
What kind of samples do you XRF measure with semi-quantitative (or Standardless) package instead of a conventional calibration? And why? It seems that more and more analysis are made with semi-quantitative (or Standardless) package. Most of the tim...
Last replied to by
The fundamental parameters (FP) approach to calibration in XRF is based upon the theoretical relationship between measured x-rays and the concentrations of elements in the sample. It takes into accoun...
17
REPLIES
1163
VIEWS
Started by
What's the most difficult application you have worked on with your Handheld XRF Analyzer? In the spirit of the group theme I am interested in having people share their experiences with their most difficult XRF application. It would be great to have...
Last replied to by
Excellent point! If you you are not going to do some sample prep to homogenize the sample then you probably should take an average of a bunch of single spot analyses to come closer to a better overall...
13
REPLIES
1101
VIEWS
Started by
Does anyone know how deep generally a hand-held XRF HHXRF analysis can go in the sample? I believe it depends on the sample's density, but I'm looking for a general idea. In my case I work with rock samples.
Last replied to by Victor Bergman
Great discussion. I am particularly impressed with Pol's unique Taste and Analyze recommendation. If your analyzing powders, presumably in a sample cell and using a tripod mount, then I would use a f...
11
REPLIES
1147
VIEWS
Started by Helena Russell
I am analysing some refractory material in which Carbon content determination is essential, I am using Woechast Wax as binder to prepare a pressed pellet.But i fear that Carbon present in wax will alter the results. Have anybody idea?
Last replied to by Helena Russell
Thanks a lot, all of you. It was very interesting and knowledgeable for me. I have tried Boric acid fine powder it gives better results.. Thank you so much again..
13
REPLIES
1880
VIEWS
Started by
I am curious on your options about XRF Fusion Machines/Instruments for XRF sample prep. Over the years I have seen many interesting arguments about gas vs. electric furnace fusion instruments and I am curious about the groups experiences with either...
Last replied to by Bob Mathias
A lot of interesting comments! As for selecting between Gas and Electric machines, one comment XRF Scientific are increasingly hearing from customers is the concern about the costs associated with spa...
4
REPLIES
1017
VIEWS
Started by Maya Rothman
I want to set-up a XRF analyser based Laboratory. Which XRF X-Ray is best suited for top quality laboratory analysis of Alloys. XRF is a new area for me, I have spent many years on ICPOES and ICPMS
Last replied to by Bob Mathias
For analysis of alloys (mostly high atomic no. elements) XRF of any configuration will be suitable unless you require to measure trace contaminants. If only particular category of alloys are to be tes...
7
REPLIES
1137
VIEWS
Started by
Has anyone got access to a Horiba or Bruker micro-XRF spectrometer? Would it fit to measure geology samples with major contents of Nb, P, Fe, Ti, Mn, Si, Ta, Ba, Al, U and Ca?Also, How do they obtain chemical composition images and the requirements f...
Last replied to by
As stated above, there are many points to consider when measuring bulk minerals: I.E. Particle size, Mineralogical Matrix Effects, Analysis Volume, Sample Prep Methods, XRF software modeling and syste...
9
REPLIES
2340
VIEWS
Started by
We have to submit samples of bulk materials for rapid analysis and by convention here we use either semi-quantitative XRF or quantitative XRF, followed by ICP. We use PANalytical's Omnian for bulk analysis, major and trace-element. I'm told by one pe...
Last replied to by Maya Rothman
I am using Omnian for 3 years. Approximately reports every type of samples but i have set certain set of conditions related to sample preparation. Some samples calcined before making bead or Pressed ...
9
REPLIES
4690
VIEWS
Started by JohnnyD
If I was looking to buy an XRF to read and analyze and measure carbon percentage %C in steel?  What machine should I look at buying?
Last replied to by Helena Russell
You are probably better off paying an analysis lab to to spark OES. If you're committed to doing it yourself, you should consider some old chemical techniques, such as http://nvlpubs.nist.gov/nistpubs...
7
REPLIES
2902
VIEWS
Started by
We are a mining company producing fluorspar (F2Ca). We have been so far analyzing our mineral by the chemical method. We just bought an XRF spectrometer for complete analysis of: -F,Ca,Si,Al, Fe, Mg, Pb, S.The method is useful for us only if we can d...
Last replied to by
Yes, the 'nugget effect' can be critical in geological samples. The sample for XRF needs to be both representative and of a particle size smaller than the critical escape depth of the F X-rays. Taking...
2
REPLIES
1416
VIEWS
Started by
About XRF Interferences: Anyone can give me some tips about interelement corrections in XRF technique? What is the best situation to use fundamental parameters and what is the best one to use alpha corrections? I am currently work with fused beads ...
Last replied to by Victor Bergman
Alphas and fundamental parameters work well with fused beads - not so well with pressed pellets - the reason - in fused beads the elements are oxidized, dissolved and distributed evenly in the glass...
4
REPLIES
1029
VIEWS
Started by
I have a suspicious sample that might be Uraninite a radioactive, uranium-rich mineral and ore with a chemical composition that is largely UO2With handheld XRF I found out that the machine is showing 95% Bal. But I am pretty sure that the black min...
Last replied to by
You need to have balance mode option in Software, it is with Helmut-Fischer Handheld XRF XAN500, it is having Silicon Drift Detector (SDD). Please check lhttp://www.helmut-fischer.com/en/in/coating-th...
13
REPLIES
1913
VIEWS
Started by
XRF beads to determine Zn in concentrated mineral: I have problems with the determination of Zn, ore concentrate zn, by preparing fused beads. value of Zn is between 40 and 60%
Last replied to by David
I used my XRF for Zinc for sure http://www.911metallurgist.com/blog/compare-x-ray-xrf-to-laboratory-measurement-reliability
2
REPLIES
808
VIEWS
Started by
One XRF manufacturer has had a combined XRF and XRD for the cement industry for a long time and I think there are a now few others. I am curious about peoples experience with these combo instruments. There must certainly be trade offs. Please keep yo...
Last replied to by
We sometimes use coupled XRF/XRD analyses in my university teaching and research. For XRD I have a large lab XRD and a transmission geometry benchtop system. The benchtop XRD has a small EDXRF built i...
11
REPLIES
1403
VIEWS
Started by JohnnyD
Are there anyone out there who analyze fertilizers by XRF on pressed pellets? If so what is the achieved precision on elements like N, P and S? and if you have any comments regarding sample prep in general.  We have found that its possible to analyz...
Last replied to by JohnnyD
Yes, I guess so. Based on the input we will revisit our case....and thanks to all the contributers
3
REPLIES
867
VIEWS
Started by Maya Rothman
I have been trying to analyse halogens (five chemically related elements: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At)) in soil & sediment samples at LLDs 0.5 ppm for iodine, 15 ppm for chlorine. I am able to get reproduc...
Last replied to by JohnnyD
Your results are perfectly reasonable given the calculated LLD's you reported for your set up( instrument, application set up , sample prep etc.) Typically reproducible results can be obtained at 3-5 ...
6
REPLIES
1521
VIEWS
Started by
Portable XRF use with Coarse Gold: We recently bought a handheld XRF unit for our exploration geologists. I want to use it in the mill when it's not being used for exploration and I want to see how others have utilized them in processing plants....
Last replied to by
They are going to do X-ray diffraction as well as XRF. It also mentions that there will be a sample preparation unit at the rig which will dry and prepare samples. We know that XRF works best if it is...
14
REPLIES
3355
VIEWS
Started by Bob Mathias
Which of the following is efficient in assaying carbon in Fire Assay? Directly fire assaying after pulverizing; or Ashing after pulverizing before fire assaying. Please explain why you will choose one over the other.
Last replied to by
Unless you analyze carbon on a irregular basis, no lab will want to pulverize the carbon. especially if its fully charges + 2000g/t, and other lower grade sold and rock samples has to be tested in the...
14
REPLIES
3485
VIEWS
Started by JohnnyD
For Analysis I used ASTM E815 – 99 (Determination of Calcium Fluoride in Fluorspar by Complexometric Titration) in order to determinate calcium fluoride in fluorspar, but now I want to mix light fluorspar (0.25%) with raw meal (in cement industry...
Last replied to by
The 'nugget effect' can be critical in geological samples. The sample for XRF needs to be both representative and of a particle size smaller than the critical escape depth of the F X-rays. Taking lots...

Please join and login to participate and leave a comment.