Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering

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Started by Dirt Jeffe
anyone have XRF capable of reading a multi PGM sample that contains both Pd and Rh some Au? My understanding was that Pd and Rh each need a different probe. The product is fine as frog's hair and the last XRF machine (notorious for not reading PGMs) ...
Last replied to by David
Hello DJ, What size (um) are frog's hair again? Size does not relate to strength. In South America the saying is Pelo de chucha jala más que cadena de barco. 0.5% Au? that is funny! You don't quest...
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Started by david.menendez
Hi to everyone, I’m trying to find spare parts for an old Denver d-12 lab flotation machine. The impeller we are using has a diameter of around 7 centimeters (2-3/4”). Does anyone know where to get this kind of spares?. We have  asked to Metso ...
Last replied to by SmartDog
Try Sepor, they sell D-12 machines and parts https://www.sepor.com/product/laboratory-flotation-machine-d-12/  
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Started by Mreza555
I'm working with a "LECO ONH836" elemental analyzer. we do not have enough calibration samples for Hydrogen. I wanted to know whether it is possible to add 2 one gram samples (5 ppm) instead of a 10 ppm sample. I assume that will work but Is it stand...
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Last replied to by Jorge
I believe that it is possible to operate the equipment with 1-gram sample. In this case, the range reported for oxygen hydrogen and nitrogen is as follow, Oxygen: 0.00005 to 50 mg Nitrogen, Helium...
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Started by kati567
  Hello everyone I did not expose the crushed ore by the action of dilute nitric acid to remove the base metals. I poured chlorinated water and subjected to high temperatures, filtered, added FeSO4. Powder settled at the bottom. What d...
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Last replied to by Jorge
After adding chlorine, it is necessary to precipitate the dissolved gold using a reducing agent such as bisulphite or ferrous sulphate. if we consider ferrous sulphate, the chemical reaction is, 3FeS...
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Started by Melih
First of all,for the processing of gold and tellurium ores,how exactly does the pos-roasting(calsine ores contain % 60- 62 Fe ) process work,what is the way to obtain tellurium. Second,which do you prefer for chemical analysis,aquea regea or fire a...
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Last replied to by Jorge
There are two main gold-telluride minerals, calaverite and sylvanite. Regarding the calaverite, if the ore is heated to around 510 oC, then, the gold and tellurium are separated producing tellurium di...
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Started by Padre
Hi All, I'm looking for mineral processing icons/symbols that are available for download. Any package or libraries are welcome. Thank you
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Last replied to by Jorge
I forgot to to include the extension. See the right link, https://www.edrawsoft.com/manufacturing-flowchart-symbols.html
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Started by Adimulu
We are running Gold Mill , we are using spreadsheets for metal accounting and other production reports. We are looking for sustainable data-base to avoid all the problems related to the use of spreadsheets. I need help on getting the list of proved ...
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Last replied to by Jorge
I believe you can consider some options such as Inventeo, SysCAD, Algosys, Metal Accounting (developed by MMPIglobal), and BalSMART.
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Started by Algev
Seeking help from knowledgeable metallurgists. I would like to make amalgam's, some of the element I would like to melt together are: Selenium Gallium Which noble metals are compatible and can melted to create an amalgam for example: Selenium an...
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Last replied to by Jorge
Mercury may form amalgam with many metals. The amalgam can be made by direct contact. In some cases, it is necessary to increase the temperature. The typical elements are sodium, potassium, barium, ca...
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Started by dgt96
Hello, not sure which topic to ask this question in, but here it goes. Im selling some industrial spent catalysts and my client asked if the catalyst was "roasted" or "unroasted". I had never heard this terminology. Does anybody here has experience w...
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Last replied to by Bhaduri
Spent catalyst from a refinery setting contains hydrocarbons in addition to spent metals, coke, alumina, silica, sulfur & a host of transition metal impurities. Once the shipment reaches a metals recy...
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Started by Zimboskud
Hi All. I am desperately looking for a clear protocol for testing the loading of my carbons from CIP to assess how much gold is currently residing on them. Usually I send them to the lab - but it appears as though the accuracy of the labs results ha...
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Last replied to by Todd H
Here is the quickest method I know: Pulverize a known weight of carbon,(may not need to do this), Ash the carbon in a furnace (be careful there will be very little material left and it will be high ...
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Started by kati567
Respected, After exposure of ore to chlorine water at higher boiling temperatures and withdrawal of ocher-yellow powders using iron(ll) sulfate. How to release the powder of other non-noble metals and get a pure golden powder capable of melting? Fr...
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207
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Started by jasonmaguire99
Hi all,  Our ore/float concentrate contains pyrite and arsenopyrite. I require a high arsenopyrite concentrate with as little pyrite in it as possible for some leaching testwork but have not had any luck.  Does anybody have any experience with thi...
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Last replied to by Jorge
In some cases, it is important to evaluate options to recovery gold from tailings. As part of this lab work, the basic idea is to obtain a pyrite-arsenopyrite concentrate. Most of the gold can be repo...
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Started by Bonzoboy
I hope this subject is correct for this forum.  I'm looking at a process where high-pressure CO2 (associated with H2O) will be blended in a mill/pulverizer with MgSiO4 (milling the silicates down well below -200 mesh).  I expect the carbonate react...
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Started by joshua cheyo
I used this procedure to determine specific gravity of an ore. Is the method accurate?
Last replied to by SmartDog
If the sample was a liquid, that would be correct.  If the sample was a solid (several different particles) then not exactly as you need to account for the voids.  
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Started by SSSlucin
I recently aquired several raw or uncut stones possibly moisanite or saphire have heated a few to glowing  point and dropped in cold water.     So my question is what other stones aside from the afore menchioned are capable of this type of therma...
Last replied to by SmartDog
It will depend on the the individual structure of each mineral sample.  If there are any significant inclusion or fractures planes (which may not be visible) then the stone can fracture quite signifi...
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Started by Nick H
So I've got a project I'm working on that I need help finding a material for. I'm a fountain pen enthusiast, and I'm trying to find a material to make flexible nibs out of that would improve upon the current standard of 14 karat gold. It needs to be ...
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Last commented on by Nick H
Thanks for the suggestion, but I'm not sure how well it would work. How much heat does it typically take for such an alloy to return to it's original shape?
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348
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Started by alex.gould
Hi, a customer has approached us to make new grate and 'cap' for their vibratory ball mill. The barrel is about 28" in diameter, and 36" long, using about 2000lbs of ball charge. We are hoping to get more longevity from the grate, so the idea is to f...
Last replied to by David
Hi Alex i fixed the image upload bug. Please go ahead and upload your photos. in the meantime, did you see https://www.911metallurgist.com/blog/overflow-vs-grate-discharge-ball-mills & https://ww...
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Started by Mreza555
Hi we are working with a LECO OH836 analyzer. the instrument does not get ready to analyze. we have checked all Orings and fittings, all pressures are at range, leak check passed and there is no warning on diagnostics tab. what should we do to make ...
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Started by bja2399
As pure metal elements get colder, close to absolute zero, do their protons and neutrons lose their ability to avoid combining with other atoms especially if the system is under great pressure, say 300 GPa? Could they combine to form other elem...
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Last replied to by bja2399
May need to go past 1000GPa, but I think it can be done. I'm not sure how to compress pure metal to 1000 GPa or more, however. Any ideas?
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Started by BentFunky
How selective is ammonium chloride when precipitating Pt from aqua regia? For example, will it also precipitate base metals from aqua regia?
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Last replied to by Todd H
You will need to consult a chemistry reference book (CRC) for the various solubilities of metal chlorides to find out.  Most base metals are fairly soluble in the chloride state.
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Started by Opie_Ute
We have a fan at my work, which has ~15% dilute sulfuric acid unintentionally pulled into the gas stream. The fan wheel and housing are constructed of 916L stainless steel. For many years the fan shaft had a 916L stainless steel sleeve on the portion...
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Last replied to by Todd H
I have some experience with material of construction for acid autoclaves and we found that some ferralium alloys tend to suffer grain boundary corrosion in the presence of sulfuric fumes.  The vapor ...
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Started by Millza79
Can anyone point me in the right direction for the proper way of sub-sampling out of a 20 litre bucket of slurry?
Last replied to by David
the best way https://www.911metallurgist.com/equipment/liquid-slurry-sample-splitter/ otherwise mix it with this and take your sample.  
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Started by Johnsonwt
  Hi there, I have been going through much R&D to with a product to find one that is strong enough and rust proof. The latest is carbon steel with a zinc coating.. though salt water seems to penetrate it and cause blackening and some build up...
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Last replied to by Johnsonwt
Hi Smartdog, one last question for you, would Martensitic stainless steel be a good fit as well?
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Started by Seeker
Does rhodium dissolve in aqua regia, if yes, can hot aqua regia speed up the dissolution?
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Last replied to by Wieslaw Wodecki
Rod pylasty rozpuści się w gorącej wodzie królewskiej , ale jeżeli jest w sztabce po stopieniu będzie to trwało wieki. Wtedy do rozpuszczania najlepiej zastosować K2S2O8. Rozpuszczanie w sto...
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Started by lnldtt
Hi everyone, I'm looking for a metallurgical software to simulate a heap leaching operation, in order to forecast plant metal production. My first choice is Metsim but is there any other software that anyone could recommend for this specific applicat...
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Last replied to by SIMetallurgist
Agree with Todd -Metsim -GoldSim -Excel Macro based model - many consultants can build this for you. You will want to understand your heap leach test work data very well before starting to model. ...
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Started by Mreza555
Is there any specific instrument that directly determines sticking index of pellets? or it should be done just by calculations from reduction processes?  
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Last replied to by Jorge
See links below, https://www.911metallurgist.com/pellets-direct-reduction/   https://www.911metallurgist.com/hyl-iii-direct-reduction-process/
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Started by Millza79
Wasn't sure where to put this.   What exactly are "marketing costs" when it comes to sending concentrates to smelters? Are they TCs/RCs or something else?
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Last replied to by afxdes
Marketing costs are generally captured by the Net Smelter Return calculations, which should include finance costs and freight charges. Additionally you can include General & Administrative costs (G&A)...
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Started by kevind
I'm looking for help with processing ore containing gold, silver, and copper. I live in fairly remote location in Baja California on the Sea of Cortez, (an hour by boat from a small town with basics that is 6 hours from a city) and acquiring certain...
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Last replied to by Jorge
I think you should consider a testing program to evaluate the metallurgical performance of the different materials you mentioned. Initially, try to evaluate separately the ore types, based on the resu...
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Started by nhngh
Hi everyone, I'm a newbie here. I don't know if I'm posting in the right place. Could anyone please tell me how to determine which beneficiation technique would be most suitable for beneficiating a Bauxite ore by using the physical parameters of Gib...
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Last commented on by nhngh
So if I want to determine it based on theory, which parameter can I use? I did research and found only the density of Gibbsite.
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Started by Jayakumar
Hello All Can anyone help me, complete process flow of Ammonium Metatungstate (AMT).
Last replied to by David
Apparently not...
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Started by biggerthanpenny
Hi all, I know this is a long shot but does anyone have any information on how to source any of these software packages? The company that produced the software was Mineral Technologies International (http://www.mineraltech.com/MODSIM/index.html), I...
Last replied to by David
i use https://www.hsc-chemistry.com/
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Started by Mreza555
Hi I am working on a ARL8860 instrument and the main use is for copper industry. they use fire assay technique to analyze precious metals. is there an individual "Fire assay Module" for this instrument? or it can be done just by calibrations? Thank...
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Last commented on by Mreza555
I meant they want to analyse lead buttons extracted from fire assay crucibles. and ARL has another OES instrument (fire assay analyzer) designed for this purpose. I wanted to know whether there is a s...
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Started by MSKabir
During rotation of a SAG mill, the three prominent zones are the grinding zone, tumbling or cascading zone and the cataracting zone (crushing zone). Are there any studies about the percentage of wear in the areas mentioned and what type of wear domin...
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Last replied to by Todd H
This is not a straight forward question as it depends on a lot of variables.  Liner designs are meant to keep the wear even so that you are replacing liners that are evenly worn.  You dont want to p...
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Started by richardh
Hi I need assistance in calculating the end velocity of a 278.45 m3/h slurry of 1.6 SG density down a 45 degree rubber lined steel pipe of 480mm inner diameter. The fluid enters the pipe at near zero velocity. The vertical drop is 6.8m and pipe leng...
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Last replied to by Todd H
Also this link: https://www.engineeringtoolbox.com/mannings-formula-gravity-flow-d_800.html
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Started by Angela
Our lab guy has asked about different types of rhodanine: apparently he found cheap stuff and expensive stuff. I thought that there was only one, but I never had to prepare it, myself. An EPA procedure (https://www.epa.gov/sites/production/files/20...
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Last replied to by Jorge
It is correct, to determine free cyanide using silver nitrate titration, you can use rhodanine, It is common to use acetone to prepare the solution. Also, you can use potassium iodide. Both solutions ...

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