Laboratory Testing & General Mineral Processing Engineering

Laboratory Testing & General Mineral Processing Engineering

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Started by Teggry [closed]
Hi, I'm looking to writing up a procedure on Lime Slurry Strength test. Can anyone run through what the steps are please?
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Last replied to by Teggry
Thanks Jorge, Sorry for delayed reply.
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Started by juanfrancisco1992 [closed]
Spikes, a fashion jewelry from the US, released a few years ago a brand new set of rings made of what they call "tisten", a mixture (notice I haven't used the term alloy) of tungsten and titanium, by far the two most popular "rare" metals used today ...
Last replied to by SmartDog
You can buy an alloy of tungsten and titanium, mostly from China https://www.americanelements.com/tungsten-titanium-alloy-58397-70-9  
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Started by Luftbert [closed]
Hi, I am a homeowner with an odd oxidation problem - hoping somebody can help.  Will try to keep the story short, though it is a little interesting. For some years, a 3/4" main copper water supply pipe in my basement kept developing oxidation in a...
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Last replied to by Jorge
You clarified your problem, that is good. If your tools show corrosion and oxidation, the acid liquid might have released some fumes in the basement. You are right, they can cause the oxidation of you...
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Started by sbs [closed]
About 50 years ago I obtained a cast US  Mint silver ingot.  The Mint had a program that permitted the public to exchange silver scrap for ingots. The ingot is noted by its serial number on a US Mint Services Deposit Memorandum and Bar Delivery Rec...
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Last replied to by sbs
Thanks for any insight or possibly suggestion of a way to examine the bar differently to gain a fuller appreciation of its appearance.
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Started by jcpolizzi [closed]
Hardened steel firearm cartridge extractor part that is 9.0 cm long and tapers from 0.7 cm diameter to a hooked nipple of (what had once been 0.3 cm diameter but, because of an improper abusive procedure that caused damage by excessive wear) 0.25 cm....
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Started by Eng. Cosmas Wambura [closed]
Hello, i ask for the help about the formula which I may use to get the amount of chemical/reagent required in such chemicals as they are applicable in vat leaching. Sodium Cyanide Ammonium Nitrate Hydrogen Peroxide Caustic Soda Lime Sodium Su...
Last replied to by SmartDog
These porportions are best determined by performing metallurgical tests. see: https://www.911metallurgist.com/blog/vat-gold-leaching-dissolution
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Started by Sam_123 [closed]
Dear Members, Could anyone help me please calculate rotary drum scrubber power & size. I searched a lot on google but was unable to get any material. Thanks & Regards Sam 
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Last replied to by Sam_123
Thanks for your reply. This scrubber is used in an iron ore beneficiation plant, please find the details below Drum Type - Rotary washing drum for iron ore, Drum speed  10 rpm Feed material - iron...
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Started by Andreas [closed]
Hello. Does anyone know a formula to calculate the production rate (tons/hours) of an electrowinning circuit, given the flowrate of the electrolyte (t/h) and the concentration (g/L) of the metal in the electrolyte?
Last replied to by SmartDog
It kind of depends on a lot of things you did not mention, such as what you are processing.  You can always start with this: https://www.911metallurgist.com/blog/wp-content/uploads/2015/11/Design-Cop...
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Started by Andreas [closed]
Hello. I'm trying to come up with a P&ID diagram of an Electrowinning circuit which has an electrolyte storage tank, pump, heat exchanger and then electrowinning cells. Is there anyone who can help me with a simple sketch of how this P&ID diagram sho...
Last replied to by SmartDog
It sort of depends on a lot of things you did not mention, such as what you are processing and the rate you are processing it at.
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Started by Ruel Zosas [closed]
Please let me know what kind of metal is this?
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Started by ca1 [closed]
Hello. Can anyone recommend a lab, preferably in North America to do some assay work on a graphite ore that we got in a drill hole?  Specifically we are looking for graphite type and carbon content to see if this is worth pursuing.  Thanks!
Last replied to by David
NolanGoddard@actlabs.com
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Started by lnldtt [closed]
Hi everyone! I've been asked to test flotation tailings in column leaching. The tailings have a P80 about 120 um, so to test in a column the particles need to be agglomerated first. The question is, is it possible to agglomerate the sample with this ...
Last replied to by David
https://www.911metallurgist.com/blog/wp-content/uploads/2015/10/BACTERIAL-OXIDATION-OF-A-REFRACTORY-ARSENOPYRITE-GOLD-CONCENTRATE.pdf https://www.911metallurgist.com/hydrometallurgy/bioleaching-techn...
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Started by Dirt Jeffe [closed]
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 [closed]
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 [closed]
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 [closed]
  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 [closed]
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 [closed]
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 [closed]
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 [closed]
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 [closed]
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 [closed]
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 [closed]
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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Started by jasonmaguire99 [closed]
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 [closed]
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 [closed]
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 [closed]
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 [closed]
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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Started by alex.gould [closed]
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 [closed]
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 [closed]
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 [closed]
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 [closed]
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 [closed]
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 [closed]
  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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